Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Simple NUMA memory policy for the Linux kernel. |
| 3 | * |
| 4 | * Copyright 2003,2004 Andi Kleen, SuSE Labs. |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 5 | * (C) Copyright 2005 Christoph Lameter, Silicon Graphics, Inc. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | * Subject to the GNU Public License, version 2. |
| 7 | * |
| 8 | * NUMA policy allows the user to give hints in which node(s) memory should |
| 9 | * be allocated. |
| 10 | * |
| 11 | * Support four policies per VMA and per process: |
| 12 | * |
| 13 | * The VMA policy has priority over the process policy for a page fault. |
| 14 | * |
| 15 | * interleave Allocate memory interleaved over a set of nodes, |
| 16 | * with normal fallback if it fails. |
| 17 | * For VMA based allocations this interleaves based on the |
| 18 | * offset into the backing object or offset into the mapping |
| 19 | * for anonymous memory. For process policy an process counter |
| 20 | * is used. |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 21 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | * bind Only allocate memory on a specific set of nodes, |
| 23 | * no fallback. |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 24 | * FIXME: memory is allocated starting with the first node |
| 25 | * to the last. It would be better if bind would truly restrict |
| 26 | * the allocation to memory nodes instead |
| 27 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | * preferred Try a specific node first before normal fallback. |
David Rientjes | 00ef2d2 | 2013-02-22 16:35:36 -0800 | [diff] [blame] | 29 | * As a special case NUMA_NO_NODE here means do the allocation |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | * on the local CPU. This is normally identical to default, |
| 31 | * but useful to set in a VMA when you have a non default |
| 32 | * process policy. |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 33 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | * default Allocate on the local node first, or when on a VMA |
| 35 | * use the process policy. This is what Linux always did |
| 36 | * in a NUMA aware kernel and still does by, ahem, default. |
| 37 | * |
| 38 | * The process policy is applied for most non interrupt memory allocations |
| 39 | * in that process' context. Interrupts ignore the policies and always |
| 40 | * try to allocate on the local CPU. The VMA policy is only applied for memory |
| 41 | * allocations for a VMA in the VM. |
| 42 | * |
| 43 | * Currently there are a few corner cases in swapping where the policy |
| 44 | * is not applied, but the majority should be handled. When process policy |
| 45 | * is used it is not remembered over swap outs/swap ins. |
| 46 | * |
| 47 | * Only the highest zone in the zone hierarchy gets policied. Allocations |
| 48 | * requesting a lower zone just use default policy. This implies that |
| 49 | * on systems with highmem kernel lowmem allocation don't get policied. |
| 50 | * Same with GFP_DMA allocations. |
| 51 | * |
| 52 | * For shmfs/tmpfs/hugetlbfs shared memory the policy is shared between |
| 53 | * all users and remembered even when nobody has memory mapped. |
| 54 | */ |
| 55 | |
| 56 | /* Notebook: |
| 57 | fix mmap readahead to honour policy and enable policy for any page cache |
| 58 | object |
| 59 | statistics for bigpages |
| 60 | global policy for page cache? currently it uses process policy. Requires |
| 61 | first item above. |
| 62 | handle mremap for shared memory (currently ignored for the policy) |
| 63 | grows down? |
| 64 | make bind policy root only? It can trigger oom much faster and the |
| 65 | kernel is not always grateful with that. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | */ |
| 67 | |
Mitchel Humpherys | b1de0d1 | 2014-06-06 14:38:30 -0700 | [diff] [blame] | 68 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 69 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | #include <linux/mempolicy.h> |
| 71 | #include <linux/mm.h> |
| 72 | #include <linux/highmem.h> |
| 73 | #include <linux/hugetlb.h> |
| 74 | #include <linux/kernel.h> |
| 75 | #include <linux/sched.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | #include <linux/nodemask.h> |
| 77 | #include <linux/cpuset.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | #include <linux/slab.h> |
| 79 | #include <linux/string.h> |
Paul Gortmaker | b95f1b31 | 2011-10-16 02:01:52 -0400 | [diff] [blame] | 80 | #include <linux/export.h> |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 81 | #include <linux/nsproxy.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | #include <linux/interrupt.h> |
| 83 | #include <linux/init.h> |
| 84 | #include <linux/compat.h> |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 85 | #include <linux/swap.h> |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 86 | #include <linux/seq_file.h> |
| 87 | #include <linux/proc_fs.h> |
Christoph Lameter | b20a350 | 2006-03-22 00:09:12 -0800 | [diff] [blame] | 88 | #include <linux/migrate.h> |
Hugh Dickins | 62b61f6 | 2009-12-14 17:59:33 -0800 | [diff] [blame] | 89 | #include <linux/ksm.h> |
Christoph Lameter | 95a402c | 2006-06-23 02:03:53 -0700 | [diff] [blame] | 90 | #include <linux/rmap.h> |
David Quigley | 86c3a76 | 2006-06-23 02:04:02 -0700 | [diff] [blame] | 91 | #include <linux/security.h> |
Adrian Bunk | dbcb0f1 | 2007-10-16 01:26:26 -0700 | [diff] [blame] | 92 | #include <linux/syscalls.h> |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 93 | #include <linux/ctype.h> |
KOSAKI Motohiro | 6d9c285 | 2009-12-14 17:58:11 -0800 | [diff] [blame] | 94 | #include <linux/mm_inline.h> |
Lee Schermerhorn | b24f53a | 2012-10-25 14:16:32 +0200 | [diff] [blame] | 95 | #include <linux/mmu_notifier.h> |
Mitchel Humpherys | b1de0d1 | 2014-06-06 14:38:30 -0700 | [diff] [blame] | 96 | #include <linux/printk.h> |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 97 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | #include <asm/tlbflush.h> |
| 99 | #include <asm/uaccess.h> |
| 100 | |
Nick Piggin | 62695a8 | 2008-10-18 20:26:09 -0700 | [diff] [blame] | 101 | #include "internal.h" |
| 102 | |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 103 | /* Internal flags */ |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 104 | #define MPOL_MF_DISCONTIG_OK (MPOL_MF_INTERNAL << 0) /* Skip checks for continuous vmas */ |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 105 | #define MPOL_MF_INVERT (MPOL_MF_INTERNAL << 1) /* Invert check for nodemask */ |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 106 | |
Pekka Enberg | fcc234f | 2006-03-22 00:08:13 -0800 | [diff] [blame] | 107 | static struct kmem_cache *policy_cache; |
| 108 | static struct kmem_cache *sn_cache; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | /* Highest zone. An specific allocation for a zone below that is not |
| 111 | policied. */ |
Christoph Lameter | 6267276 | 2007-02-10 01:43:07 -0800 | [diff] [blame] | 112 | enum zone_type policy_zone = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 114 | /* |
| 115 | * run-time system-wide default policy => local allocation |
| 116 | */ |
H Hartley Sweeten | e754d79 | 2011-10-31 17:09:23 -0700 | [diff] [blame] | 117 | static struct mempolicy default_policy = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | .refcnt = ATOMIC_INIT(1), /* never free it */ |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 119 | .mode = MPOL_PREFERRED, |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 120 | .flags = MPOL_F_LOCAL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | }; |
| 122 | |
Mel Gorman | 5606e38 | 2012-11-02 18:19:13 +0000 | [diff] [blame] | 123 | static struct mempolicy preferred_node_policy[MAX_NUMNODES]; |
| 124 | |
Oleg Nesterov | 74d2c3a | 2014-10-09 15:27:50 -0700 | [diff] [blame] | 125 | struct mempolicy *get_task_policy(struct task_struct *p) |
Mel Gorman | 5606e38 | 2012-11-02 18:19:13 +0000 | [diff] [blame] | 126 | { |
| 127 | struct mempolicy *pol = p->mempolicy; |
Oleg Nesterov | f15ca78 | 2014-10-09 15:27:43 -0700 | [diff] [blame] | 128 | int node; |
Mel Gorman | 5606e38 | 2012-11-02 18:19:13 +0000 | [diff] [blame] | 129 | |
Oleg Nesterov | f15ca78 | 2014-10-09 15:27:43 -0700 | [diff] [blame] | 130 | if (pol) |
| 131 | return pol; |
Mel Gorman | 5606e38 | 2012-11-02 18:19:13 +0000 | [diff] [blame] | 132 | |
Oleg Nesterov | f15ca78 | 2014-10-09 15:27:43 -0700 | [diff] [blame] | 133 | node = numa_node_id(); |
| 134 | if (node != NUMA_NO_NODE) { |
| 135 | pol = &preferred_node_policy[node]; |
| 136 | /* preferred_node_policy is not initialised early in boot */ |
| 137 | if (pol->mode) |
| 138 | return pol; |
Mel Gorman | 5606e38 | 2012-11-02 18:19:13 +0000 | [diff] [blame] | 139 | } |
| 140 | |
Oleg Nesterov | f15ca78 | 2014-10-09 15:27:43 -0700 | [diff] [blame] | 141 | return &default_policy; |
Mel Gorman | 5606e38 | 2012-11-02 18:19:13 +0000 | [diff] [blame] | 142 | } |
| 143 | |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 144 | static const struct mempolicy_operations { |
| 145 | int (*create)(struct mempolicy *pol, const nodemask_t *nodes); |
Miao Xie | 708c1bb | 2010-05-24 14:32:07 -0700 | [diff] [blame] | 146 | /* |
| 147 | * If read-side task has no lock to protect task->mempolicy, write-side |
| 148 | * task will rebind the task->mempolicy by two step. The first step is |
| 149 | * setting all the newly nodes, and the second step is cleaning all the |
| 150 | * disallowed nodes. In this way, we can avoid finding no node to alloc |
| 151 | * page. |
| 152 | * If we have a lock to protect task->mempolicy in read-side, we do |
| 153 | * rebind directly. |
| 154 | * |
| 155 | * step: |
| 156 | * MPOL_REBIND_ONCE - do rebind work at once |
| 157 | * MPOL_REBIND_STEP1 - set all the newly nodes |
| 158 | * MPOL_REBIND_STEP2 - clean all the disallowed nodes |
| 159 | */ |
| 160 | void (*rebind)(struct mempolicy *pol, const nodemask_t *nodes, |
| 161 | enum mpol_rebind_step step); |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 162 | } mpol_ops[MPOL_MAX]; |
| 163 | |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 164 | static inline int mpol_store_user_nodemask(const struct mempolicy *pol) |
| 165 | { |
Bob Liu | 6d55629 | 2010-05-24 14:31:59 -0700 | [diff] [blame] | 166 | return pol->flags & MPOL_MODE_FLAGS; |
David Rientjes | 4c50bc0 | 2008-04-28 02:12:30 -0700 | [diff] [blame] | 167 | } |
| 168 | |
| 169 | static void mpol_relative_nodemask(nodemask_t *ret, const nodemask_t *orig, |
| 170 | const nodemask_t *rel) |
| 171 | { |
| 172 | nodemask_t tmp; |
| 173 | nodes_fold(tmp, *orig, nodes_weight(*rel)); |
| 174 | nodes_onto(*ret, tmp, *rel); |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 175 | } |
| 176 | |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 177 | static int mpol_new_interleave(struct mempolicy *pol, const nodemask_t *nodes) |
| 178 | { |
| 179 | if (nodes_empty(*nodes)) |
| 180 | return -EINVAL; |
| 181 | pol->v.nodes = *nodes; |
| 182 | return 0; |
| 183 | } |
| 184 | |
| 185 | static int mpol_new_preferred(struct mempolicy *pol, const nodemask_t *nodes) |
| 186 | { |
| 187 | if (!nodes) |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 188 | pol->flags |= MPOL_F_LOCAL; /* local allocation */ |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 189 | else if (nodes_empty(*nodes)) |
| 190 | return -EINVAL; /* no allowed nodes */ |
| 191 | else |
| 192 | pol->v.preferred_node = first_node(*nodes); |
| 193 | return 0; |
| 194 | } |
| 195 | |
| 196 | static int mpol_new_bind(struct mempolicy *pol, const nodemask_t *nodes) |
| 197 | { |
Zhihui Zhang | 859f7ef | 2014-12-18 16:17:09 -0800 | [diff] [blame] | 198 | if (nodes_empty(*nodes)) |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 199 | return -EINVAL; |
| 200 | pol->v.nodes = *nodes; |
| 201 | return 0; |
| 202 | } |
| 203 | |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 204 | /* |
| 205 | * mpol_set_nodemask is called after mpol_new() to set up the nodemask, if |
| 206 | * any, for the new policy. mpol_new() has already validated the nodes |
| 207 | * parameter with respect to the policy mode and flags. But, we need to |
| 208 | * handle an empty nodemask with MPOL_PREFERRED here. |
| 209 | * |
| 210 | * Must be called holding task's alloc_lock to protect task's mems_allowed |
| 211 | * and mempolicy. May also be called holding the mmap_semaphore for write. |
| 212 | */ |
KAMEZAWA Hiroyuki | 4bfc449 | 2009-08-06 15:07:33 -0700 | [diff] [blame] | 213 | static int mpol_set_nodemask(struct mempolicy *pol, |
| 214 | const nodemask_t *nodes, struct nodemask_scratch *nsc) |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 215 | { |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 216 | int ret; |
| 217 | |
| 218 | /* if mode is MPOL_DEFAULT, pol is NULL. This is right. */ |
| 219 | if (pol == NULL) |
| 220 | return 0; |
Lai Jiangshan | 01f13bd | 2012-12-12 13:51:33 -0800 | [diff] [blame] | 221 | /* Check N_MEMORY */ |
KAMEZAWA Hiroyuki | 4bfc449 | 2009-08-06 15:07:33 -0700 | [diff] [blame] | 222 | nodes_and(nsc->mask1, |
Lai Jiangshan | 01f13bd | 2012-12-12 13:51:33 -0800 | [diff] [blame] | 223 | cpuset_current_mems_allowed, node_states[N_MEMORY]); |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 224 | |
| 225 | VM_BUG_ON(!nodes); |
| 226 | if (pol->mode == MPOL_PREFERRED && nodes_empty(*nodes)) |
| 227 | nodes = NULL; /* explicit local allocation */ |
| 228 | else { |
| 229 | if (pol->flags & MPOL_F_RELATIVE_NODES) |
Zhihui Zhang | 859f7ef | 2014-12-18 16:17:09 -0800 | [diff] [blame] | 230 | mpol_relative_nodemask(&nsc->mask2, nodes, &nsc->mask1); |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 231 | else |
KAMEZAWA Hiroyuki | 4bfc449 | 2009-08-06 15:07:33 -0700 | [diff] [blame] | 232 | nodes_and(nsc->mask2, *nodes, nsc->mask1); |
| 233 | |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 234 | if (mpol_store_user_nodemask(pol)) |
| 235 | pol->w.user_nodemask = *nodes; |
| 236 | else |
| 237 | pol->w.cpuset_mems_allowed = |
| 238 | cpuset_current_mems_allowed; |
| 239 | } |
| 240 | |
KAMEZAWA Hiroyuki | 4bfc449 | 2009-08-06 15:07:33 -0700 | [diff] [blame] | 241 | if (nodes) |
| 242 | ret = mpol_ops[pol->mode].create(pol, &nsc->mask2); |
| 243 | else |
| 244 | ret = mpol_ops[pol->mode].create(pol, NULL); |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 245 | return ret; |
| 246 | } |
| 247 | |
| 248 | /* |
| 249 | * This function just creates a new policy, does some check and simple |
| 250 | * initialization. You must invoke mpol_set_nodemask() to set nodes. |
| 251 | */ |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 252 | static struct mempolicy *mpol_new(unsigned short mode, unsigned short flags, |
| 253 | nodemask_t *nodes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | { |
| 255 | struct mempolicy *policy; |
| 256 | |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 257 | pr_debug("setting mode %d flags %d nodes[0] %lx\n", |
David Rientjes | 00ef2d2 | 2013-02-22 16:35:36 -0800 | [diff] [blame] | 258 | mode, flags, nodes ? nodes_addr(*nodes)[0] : NUMA_NO_NODE); |
Paul Mundt | 140d5a4 | 2007-07-15 23:38:16 -0700 | [diff] [blame] | 259 | |
David Rientjes | 3e1f064 | 2008-04-28 02:12:34 -0700 | [diff] [blame] | 260 | if (mode == MPOL_DEFAULT) { |
| 261 | if (nodes && !nodes_empty(*nodes)) |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 262 | return ERR_PTR(-EINVAL); |
Lee Schermerhorn | d3a7103 | 2012-10-25 14:16:29 +0200 | [diff] [blame] | 263 | return NULL; |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 264 | } |
David Rientjes | 3e1f064 | 2008-04-28 02:12:34 -0700 | [diff] [blame] | 265 | VM_BUG_ON(!nodes); |
| 266 | |
| 267 | /* |
| 268 | * MPOL_PREFERRED cannot be used with MPOL_F_STATIC_NODES or |
| 269 | * MPOL_F_RELATIVE_NODES if the nodemask is empty (local allocation). |
| 270 | * All other modes require a valid pointer to a non-empty nodemask. |
| 271 | */ |
| 272 | if (mode == MPOL_PREFERRED) { |
| 273 | if (nodes_empty(*nodes)) { |
| 274 | if (((flags & MPOL_F_STATIC_NODES) || |
| 275 | (flags & MPOL_F_RELATIVE_NODES))) |
| 276 | return ERR_PTR(-EINVAL); |
David Rientjes | 3e1f064 | 2008-04-28 02:12:34 -0700 | [diff] [blame] | 277 | } |
Peter Zijlstra | 479e280 | 2012-10-25 14:16:28 +0200 | [diff] [blame] | 278 | } else if (mode == MPOL_LOCAL) { |
| 279 | if (!nodes_empty(*nodes)) |
| 280 | return ERR_PTR(-EINVAL); |
| 281 | mode = MPOL_PREFERRED; |
David Rientjes | 3e1f064 | 2008-04-28 02:12:34 -0700 | [diff] [blame] | 282 | } else if (nodes_empty(*nodes)) |
| 283 | return ERR_PTR(-EINVAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | policy = kmem_cache_alloc(policy_cache, GFP_KERNEL); |
| 285 | if (!policy) |
| 286 | return ERR_PTR(-ENOMEM); |
| 287 | atomic_set(&policy->refcnt, 1); |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 288 | policy->mode = mode; |
David Rientjes | 3e1f064 | 2008-04-28 02:12:34 -0700 | [diff] [blame] | 289 | policy->flags = flags; |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 290 | |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 291 | return policy; |
| 292 | } |
| 293 | |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 294 | /* Slow path of a mpol destructor. */ |
| 295 | void __mpol_put(struct mempolicy *p) |
| 296 | { |
| 297 | if (!atomic_dec_and_test(&p->refcnt)) |
| 298 | return; |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 299 | kmem_cache_free(policy_cache, p); |
| 300 | } |
| 301 | |
Miao Xie | 708c1bb | 2010-05-24 14:32:07 -0700 | [diff] [blame] | 302 | static void mpol_rebind_default(struct mempolicy *pol, const nodemask_t *nodes, |
| 303 | enum mpol_rebind_step step) |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 304 | { |
| 305 | } |
| 306 | |
Miao Xie | 708c1bb | 2010-05-24 14:32:07 -0700 | [diff] [blame] | 307 | /* |
| 308 | * step: |
| 309 | * MPOL_REBIND_ONCE - do rebind work at once |
| 310 | * MPOL_REBIND_STEP1 - set all the newly nodes |
| 311 | * MPOL_REBIND_STEP2 - clean all the disallowed nodes |
| 312 | */ |
| 313 | static void mpol_rebind_nodemask(struct mempolicy *pol, const nodemask_t *nodes, |
| 314 | enum mpol_rebind_step step) |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 315 | { |
| 316 | nodemask_t tmp; |
| 317 | |
| 318 | if (pol->flags & MPOL_F_STATIC_NODES) |
| 319 | nodes_and(tmp, pol->w.user_nodemask, *nodes); |
| 320 | else if (pol->flags & MPOL_F_RELATIVE_NODES) |
| 321 | mpol_relative_nodemask(&tmp, &pol->w.user_nodemask, nodes); |
| 322 | else { |
Miao Xie | 708c1bb | 2010-05-24 14:32:07 -0700 | [diff] [blame] | 323 | /* |
| 324 | * if step == 1, we use ->w.cpuset_mems_allowed to cache the |
| 325 | * result |
| 326 | */ |
| 327 | if (step == MPOL_REBIND_ONCE || step == MPOL_REBIND_STEP1) { |
| 328 | nodes_remap(tmp, pol->v.nodes, |
| 329 | pol->w.cpuset_mems_allowed, *nodes); |
| 330 | pol->w.cpuset_mems_allowed = step ? tmp : *nodes; |
| 331 | } else if (step == MPOL_REBIND_STEP2) { |
| 332 | tmp = pol->w.cpuset_mems_allowed; |
| 333 | pol->w.cpuset_mems_allowed = *nodes; |
| 334 | } else |
| 335 | BUG(); |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 336 | } |
| 337 | |
Miao Xie | 708c1bb | 2010-05-24 14:32:07 -0700 | [diff] [blame] | 338 | if (nodes_empty(tmp)) |
| 339 | tmp = *nodes; |
| 340 | |
| 341 | if (step == MPOL_REBIND_STEP1) |
| 342 | nodes_or(pol->v.nodes, pol->v.nodes, tmp); |
| 343 | else if (step == MPOL_REBIND_ONCE || step == MPOL_REBIND_STEP2) |
| 344 | pol->v.nodes = tmp; |
| 345 | else |
| 346 | BUG(); |
| 347 | |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 348 | if (!node_isset(current->il_next, tmp)) { |
Andrew Morton | 0edaf86 | 2016-05-19 17:10:58 -0700 | [diff] [blame] | 349 | current->il_next = next_node_in(current->il_next, tmp); |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 350 | if (current->il_next >= MAX_NUMNODES) |
| 351 | current->il_next = numa_node_id(); |
| 352 | } |
| 353 | } |
| 354 | |
| 355 | static void mpol_rebind_preferred(struct mempolicy *pol, |
Miao Xie | 708c1bb | 2010-05-24 14:32:07 -0700 | [diff] [blame] | 356 | const nodemask_t *nodes, |
| 357 | enum mpol_rebind_step step) |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 358 | { |
| 359 | nodemask_t tmp; |
| 360 | |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 361 | if (pol->flags & MPOL_F_STATIC_NODES) { |
| 362 | int node = first_node(pol->w.user_nodemask); |
| 363 | |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 364 | if (node_isset(node, *nodes)) { |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 365 | pol->v.preferred_node = node; |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 366 | pol->flags &= ~MPOL_F_LOCAL; |
| 367 | } else |
| 368 | pol->flags |= MPOL_F_LOCAL; |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 369 | } else if (pol->flags & MPOL_F_RELATIVE_NODES) { |
| 370 | mpol_relative_nodemask(&tmp, &pol->w.user_nodemask, nodes); |
| 371 | pol->v.preferred_node = first_node(tmp); |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 372 | } else if (!(pol->flags & MPOL_F_LOCAL)) { |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 373 | pol->v.preferred_node = node_remap(pol->v.preferred_node, |
| 374 | pol->w.cpuset_mems_allowed, |
| 375 | *nodes); |
| 376 | pol->w.cpuset_mems_allowed = *nodes; |
| 377 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | } |
| 379 | |
Miao Xie | 708c1bb | 2010-05-24 14:32:07 -0700 | [diff] [blame] | 380 | /* |
| 381 | * mpol_rebind_policy - Migrate a policy to a different set of nodes |
| 382 | * |
| 383 | * If read-side task has no lock to protect task->mempolicy, write-side |
| 384 | * task will rebind the task->mempolicy by two step. The first step is |
| 385 | * setting all the newly nodes, and the second step is cleaning all the |
| 386 | * disallowed nodes. In this way, we can avoid finding no node to alloc |
| 387 | * page. |
| 388 | * If we have a lock to protect task->mempolicy in read-side, we do |
| 389 | * rebind directly. |
| 390 | * |
| 391 | * step: |
| 392 | * MPOL_REBIND_ONCE - do rebind work at once |
| 393 | * MPOL_REBIND_STEP1 - set all the newly nodes |
| 394 | * MPOL_REBIND_STEP2 - clean all the disallowed nodes |
| 395 | */ |
| 396 | static void mpol_rebind_policy(struct mempolicy *pol, const nodemask_t *newmask, |
| 397 | enum mpol_rebind_step step) |
David Rientjes | 1d0d268 | 2008-04-28 02:12:32 -0700 | [diff] [blame] | 398 | { |
David Rientjes | 1d0d268 | 2008-04-28 02:12:32 -0700 | [diff] [blame] | 399 | if (!pol) |
| 400 | return; |
Wang Sheng-Hui | 89c522c | 2012-05-29 15:06:16 -0700 | [diff] [blame] | 401 | if (!mpol_store_user_nodemask(pol) && step == MPOL_REBIND_ONCE && |
David Rientjes | 1d0d268 | 2008-04-28 02:12:32 -0700 | [diff] [blame] | 402 | nodes_equal(pol->w.cpuset_mems_allowed, *newmask)) |
| 403 | return; |
Miao Xie | 708c1bb | 2010-05-24 14:32:07 -0700 | [diff] [blame] | 404 | |
| 405 | if (step == MPOL_REBIND_STEP1 && (pol->flags & MPOL_F_REBINDING)) |
| 406 | return; |
| 407 | |
| 408 | if (step == MPOL_REBIND_STEP2 && !(pol->flags & MPOL_F_REBINDING)) |
| 409 | BUG(); |
| 410 | |
| 411 | if (step == MPOL_REBIND_STEP1) |
| 412 | pol->flags |= MPOL_F_REBINDING; |
| 413 | else if (step == MPOL_REBIND_STEP2) |
| 414 | pol->flags &= ~MPOL_F_REBINDING; |
| 415 | else if (step >= MPOL_REBIND_NSTEP) |
| 416 | BUG(); |
| 417 | |
| 418 | mpol_ops[pol->mode].rebind(pol, newmask, step); |
David Rientjes | 1d0d268 | 2008-04-28 02:12:32 -0700 | [diff] [blame] | 419 | } |
| 420 | |
| 421 | /* |
| 422 | * Wrapper for mpol_rebind_policy() that just requires task |
| 423 | * pointer, and updates task mempolicy. |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 424 | * |
| 425 | * Called with task's alloc_lock held. |
David Rientjes | 1d0d268 | 2008-04-28 02:12:32 -0700 | [diff] [blame] | 426 | */ |
| 427 | |
Miao Xie | 708c1bb | 2010-05-24 14:32:07 -0700 | [diff] [blame] | 428 | void mpol_rebind_task(struct task_struct *tsk, const nodemask_t *new, |
| 429 | enum mpol_rebind_step step) |
David Rientjes | 1d0d268 | 2008-04-28 02:12:32 -0700 | [diff] [blame] | 430 | { |
Miao Xie | 708c1bb | 2010-05-24 14:32:07 -0700 | [diff] [blame] | 431 | mpol_rebind_policy(tsk->mempolicy, new, step); |
David Rientjes | 1d0d268 | 2008-04-28 02:12:32 -0700 | [diff] [blame] | 432 | } |
| 433 | |
| 434 | /* |
| 435 | * Rebind each vma in mm to new nodemask. |
| 436 | * |
| 437 | * Call holding a reference to mm. Takes mm->mmap_sem during call. |
| 438 | */ |
| 439 | |
| 440 | void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new) |
| 441 | { |
| 442 | struct vm_area_struct *vma; |
| 443 | |
| 444 | down_write(&mm->mmap_sem); |
| 445 | for (vma = mm->mmap; vma; vma = vma->vm_next) |
Miao Xie | 708c1bb | 2010-05-24 14:32:07 -0700 | [diff] [blame] | 446 | mpol_rebind_policy(vma->vm_policy, new, MPOL_REBIND_ONCE); |
David Rientjes | 1d0d268 | 2008-04-28 02:12:32 -0700 | [diff] [blame] | 447 | up_write(&mm->mmap_sem); |
| 448 | } |
| 449 | |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 450 | static const struct mempolicy_operations mpol_ops[MPOL_MAX] = { |
| 451 | [MPOL_DEFAULT] = { |
| 452 | .rebind = mpol_rebind_default, |
| 453 | }, |
| 454 | [MPOL_INTERLEAVE] = { |
| 455 | .create = mpol_new_interleave, |
| 456 | .rebind = mpol_rebind_nodemask, |
| 457 | }, |
| 458 | [MPOL_PREFERRED] = { |
| 459 | .create = mpol_new_preferred, |
| 460 | .rebind = mpol_rebind_preferred, |
| 461 | }, |
| 462 | [MPOL_BIND] = { |
| 463 | .create = mpol_new_bind, |
| 464 | .rebind = mpol_rebind_nodemask, |
| 465 | }, |
| 466 | }; |
| 467 | |
Christoph Lameter | fc30128 | 2006-01-18 17:42:29 -0800 | [diff] [blame] | 468 | static void migrate_page_add(struct page *page, struct list_head *pagelist, |
| 469 | unsigned long flags); |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 470 | |
Naoya Horiguchi | 6f4576e | 2015-02-11 15:28:03 -0800 | [diff] [blame] | 471 | struct queue_pages { |
| 472 | struct list_head *pagelist; |
| 473 | unsigned long flags; |
| 474 | nodemask_t *nmask; |
| 475 | struct vm_area_struct *prev; |
| 476 | }; |
| 477 | |
Naoya Horiguchi | 9809494 | 2013-09-11 14:22:14 -0700 | [diff] [blame] | 478 | /* |
| 479 | * Scan through pages checking if pages follow certain conditions, |
| 480 | * and move them to the pagelist if they do. |
| 481 | */ |
Naoya Horiguchi | 6f4576e | 2015-02-11 15:28:03 -0800 | [diff] [blame] | 482 | static int queue_pages_pte_range(pmd_t *pmd, unsigned long addr, |
| 483 | unsigned long end, struct mm_walk *walk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | { |
Naoya Horiguchi | 6f4576e | 2015-02-11 15:28:03 -0800 | [diff] [blame] | 485 | struct vm_area_struct *vma = walk->vma; |
| 486 | struct page *page; |
| 487 | struct queue_pages *qp = walk->private; |
| 488 | unsigned long flags = qp->flags; |
Kirill A. Shutemov | 248db92 | 2016-01-15 16:54:14 -0800 | [diff] [blame] | 489 | int nid, ret; |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 490 | pte_t *pte; |
Hugh Dickins | 705e87c | 2005-10-29 18:16:27 -0700 | [diff] [blame] | 491 | spinlock_t *ptl; |
Hugh Dickins | 941150a | 2005-06-21 17:15:06 -0700 | [diff] [blame] | 492 | |
Kirill A. Shutemov | 248db92 | 2016-01-15 16:54:14 -0800 | [diff] [blame] | 493 | if (pmd_trans_huge(*pmd)) { |
| 494 | ptl = pmd_lock(walk->mm, pmd); |
| 495 | if (pmd_trans_huge(*pmd)) { |
| 496 | page = pmd_page(*pmd); |
| 497 | if (is_huge_zero_page(page)) { |
| 498 | spin_unlock(ptl); |
| 499 | split_huge_pmd(vma, pmd, addr); |
| 500 | } else { |
| 501 | get_page(page); |
| 502 | spin_unlock(ptl); |
| 503 | lock_page(page); |
| 504 | ret = split_huge_page(page); |
| 505 | unlock_page(page); |
| 506 | put_page(page); |
| 507 | if (ret) |
| 508 | return 0; |
| 509 | } |
| 510 | } else { |
| 511 | spin_unlock(ptl); |
| 512 | } |
| 513 | } |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 514 | |
Kirill A. Shutemov | 248db92 | 2016-01-15 16:54:14 -0800 | [diff] [blame] | 515 | retry: |
Naoya Horiguchi | 6f4576e | 2015-02-11 15:28:03 -0800 | [diff] [blame] | 516 | pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl); |
| 517 | for (; addr != end; pte++, addr += PAGE_SIZE) { |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 518 | if (!pte_present(*pte)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | continue; |
Linus Torvalds | 6aab341 | 2005-11-28 14:34:23 -0800 | [diff] [blame] | 520 | page = vm_normal_page(vma, addr, *pte); |
| 521 | if (!page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | continue; |
Nick Piggin | 053837f | 2006-01-18 17:42:27 -0800 | [diff] [blame] | 523 | /* |
Hugh Dickins | 62b61f6 | 2009-12-14 17:59:33 -0800 | [diff] [blame] | 524 | * vm_normal_page() filters out zero pages, but there might |
| 525 | * still be PageReserved pages to skip, perhaps in a VDSO. |
Nick Piggin | 053837f | 2006-01-18 17:42:27 -0800 | [diff] [blame] | 526 | */ |
Hugh Dickins | b79bc0a | 2013-02-22 16:35:13 -0800 | [diff] [blame] | 527 | if (PageReserved(page)) |
Christoph Lameter | f4598c8 | 2006-01-12 01:05:20 -0800 | [diff] [blame] | 528 | continue; |
Linus Torvalds | 6aab341 | 2005-11-28 14:34:23 -0800 | [diff] [blame] | 529 | nid = page_to_nid(page); |
Naoya Horiguchi | 6f4576e | 2015-02-11 15:28:03 -0800 | [diff] [blame] | 530 | if (node_isset(nid, *qp->nmask) == !!(flags & MPOL_MF_INVERT)) |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 531 | continue; |
Kirill A. Shutemov | 0a2e280 | 2016-03-09 14:08:30 -0800 | [diff] [blame] | 532 | if (PageTransCompound(page) && PageAnon(page)) { |
Kirill A. Shutemov | 248db92 | 2016-01-15 16:54:14 -0800 | [diff] [blame] | 533 | get_page(page); |
| 534 | pte_unmap_unlock(pte, ptl); |
| 535 | lock_page(page); |
| 536 | ret = split_huge_page(page); |
| 537 | unlock_page(page); |
| 538 | put_page(page); |
| 539 | /* Failed to split -- skip. */ |
| 540 | if (ret) { |
| 541 | pte = pte_offset_map_lock(walk->mm, pmd, |
| 542 | addr, &ptl); |
| 543 | continue; |
| 544 | } |
| 545 | goto retry; |
| 546 | } |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 547 | |
Kirill A. Shutemov | 77bf45e | 2016-02-05 15:36:33 -0800 | [diff] [blame] | 548 | migrate_page_add(page, qp->pagelist, flags); |
Naoya Horiguchi | 6f4576e | 2015-02-11 15:28:03 -0800 | [diff] [blame] | 549 | } |
| 550 | pte_unmap_unlock(pte - 1, ptl); |
| 551 | cond_resched(); |
| 552 | return 0; |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 553 | } |
| 554 | |
Naoya Horiguchi | 6f4576e | 2015-02-11 15:28:03 -0800 | [diff] [blame] | 555 | static int queue_pages_hugetlb(pte_t *pte, unsigned long hmask, |
| 556 | unsigned long addr, unsigned long end, |
| 557 | struct mm_walk *walk) |
Naoya Horiguchi | e2d8cf4 | 2013-09-11 14:22:03 -0700 | [diff] [blame] | 558 | { |
| 559 | #ifdef CONFIG_HUGETLB_PAGE |
Naoya Horiguchi | 6f4576e | 2015-02-11 15:28:03 -0800 | [diff] [blame] | 560 | struct queue_pages *qp = walk->private; |
| 561 | unsigned long flags = qp->flags; |
Naoya Horiguchi | e2d8cf4 | 2013-09-11 14:22:03 -0700 | [diff] [blame] | 562 | int nid; |
| 563 | struct page *page; |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 564 | spinlock_t *ptl; |
Naoya Horiguchi | d4c5491 | 2014-06-06 10:00:01 -0400 | [diff] [blame] | 565 | pte_t entry; |
Naoya Horiguchi | e2d8cf4 | 2013-09-11 14:22:03 -0700 | [diff] [blame] | 566 | |
Naoya Horiguchi | 6f4576e | 2015-02-11 15:28:03 -0800 | [diff] [blame] | 567 | ptl = huge_pte_lock(hstate_vma(walk->vma), walk->mm, pte); |
| 568 | entry = huge_ptep_get(pte); |
Naoya Horiguchi | d4c5491 | 2014-06-06 10:00:01 -0400 | [diff] [blame] | 569 | if (!pte_present(entry)) |
| 570 | goto unlock; |
| 571 | page = pte_page(entry); |
Naoya Horiguchi | e2d8cf4 | 2013-09-11 14:22:03 -0700 | [diff] [blame] | 572 | nid = page_to_nid(page); |
Naoya Horiguchi | 6f4576e | 2015-02-11 15:28:03 -0800 | [diff] [blame] | 573 | if (node_isset(nid, *qp->nmask) == !!(flags & MPOL_MF_INVERT)) |
Naoya Horiguchi | e2d8cf4 | 2013-09-11 14:22:03 -0700 | [diff] [blame] | 574 | goto unlock; |
| 575 | /* With MPOL_MF_MOVE, we migrate only unshared hugepage. */ |
| 576 | if (flags & (MPOL_MF_MOVE_ALL) || |
| 577 | (flags & MPOL_MF_MOVE && page_mapcount(page) == 1)) |
Naoya Horiguchi | 6f4576e | 2015-02-11 15:28:03 -0800 | [diff] [blame] | 578 | isolate_huge_page(page, qp->pagelist); |
Naoya Horiguchi | e2d8cf4 | 2013-09-11 14:22:03 -0700 | [diff] [blame] | 579 | unlock: |
Kirill A. Shutemov | cb900f4 | 2013-11-14 14:31:02 -0800 | [diff] [blame] | 580 | spin_unlock(ptl); |
Naoya Horiguchi | e2d8cf4 | 2013-09-11 14:22:03 -0700 | [diff] [blame] | 581 | #else |
| 582 | BUG(); |
| 583 | #endif |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 584 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | } |
| 586 | |
Aneesh Kumar K.V | 5877231 | 2013-12-06 00:08:22 +0530 | [diff] [blame] | 587 | #ifdef CONFIG_NUMA_BALANCING |
Lee Schermerhorn | b24f53a | 2012-10-25 14:16:32 +0200 | [diff] [blame] | 588 | /* |
Mel Gorman | 4b10e7d | 2012-10-25 14:16:32 +0200 | [diff] [blame] | 589 | * This is used to mark a range of virtual addresses to be inaccessible. |
| 590 | * These are later cleared by a NUMA hinting fault. Depending on these |
| 591 | * faults, pages may be migrated for better NUMA placement. |
| 592 | * |
| 593 | * This is assuming that NUMA faults are handled using PROT_NONE. If |
| 594 | * an architecture makes a different choice, it will need further |
| 595 | * changes to the core. |
Lee Schermerhorn | b24f53a | 2012-10-25 14:16:32 +0200 | [diff] [blame] | 596 | */ |
Mel Gorman | 4b10e7d | 2012-10-25 14:16:32 +0200 | [diff] [blame] | 597 | unsigned long change_prot_numa(struct vm_area_struct *vma, |
| 598 | unsigned long addr, unsigned long end) |
Lee Schermerhorn | b24f53a | 2012-10-25 14:16:32 +0200 | [diff] [blame] | 599 | { |
Mel Gorman | 4b10e7d | 2012-10-25 14:16:32 +0200 | [diff] [blame] | 600 | int nr_updated; |
Lee Schermerhorn | b24f53a | 2012-10-25 14:16:32 +0200 | [diff] [blame] | 601 | |
Mel Gorman | 4d94246 | 2015-02-12 14:58:28 -0800 | [diff] [blame] | 602 | nr_updated = change_protection(vma, addr, end, PAGE_NONE, 0, 1); |
Mel Gorman | 03c5a6e | 2012-11-02 14:52:48 +0000 | [diff] [blame] | 603 | if (nr_updated) |
| 604 | count_vm_numa_events(NUMA_PTE_UPDATES, nr_updated); |
Lee Schermerhorn | b24f53a | 2012-10-25 14:16:32 +0200 | [diff] [blame] | 605 | |
Mel Gorman | 4b10e7d | 2012-10-25 14:16:32 +0200 | [diff] [blame] | 606 | return nr_updated; |
Lee Schermerhorn | b24f53a | 2012-10-25 14:16:32 +0200 | [diff] [blame] | 607 | } |
| 608 | #else |
| 609 | static unsigned long change_prot_numa(struct vm_area_struct *vma, |
| 610 | unsigned long addr, unsigned long end) |
| 611 | { |
| 612 | return 0; |
| 613 | } |
Aneesh Kumar K.V | 5877231 | 2013-12-06 00:08:22 +0530 | [diff] [blame] | 614 | #endif /* CONFIG_NUMA_BALANCING */ |
Lee Schermerhorn | b24f53a | 2012-10-25 14:16:32 +0200 | [diff] [blame] | 615 | |
Naoya Horiguchi | 6f4576e | 2015-02-11 15:28:03 -0800 | [diff] [blame] | 616 | static int queue_pages_test_walk(unsigned long start, unsigned long end, |
| 617 | struct mm_walk *walk) |
| 618 | { |
| 619 | struct vm_area_struct *vma = walk->vma; |
| 620 | struct queue_pages *qp = walk->private; |
| 621 | unsigned long endvma = vma->vm_end; |
| 622 | unsigned long flags = qp->flags; |
| 623 | |
Kirill A. Shutemov | 77bf45e | 2016-02-05 15:36:33 -0800 | [diff] [blame] | 624 | if (!vma_migratable(vma)) |
Naoya Horiguchi | 48684a6 | 2015-02-11 15:28:06 -0800 | [diff] [blame] | 625 | return 1; |
| 626 | |
Naoya Horiguchi | 6f4576e | 2015-02-11 15:28:03 -0800 | [diff] [blame] | 627 | if (endvma > end) |
| 628 | endvma = end; |
| 629 | if (vma->vm_start > start) |
| 630 | start = vma->vm_start; |
| 631 | |
| 632 | if (!(flags & MPOL_MF_DISCONTIG_OK)) { |
| 633 | if (!vma->vm_next && vma->vm_end < end) |
| 634 | return -EFAULT; |
| 635 | if (qp->prev && qp->prev->vm_end < vma->vm_start) |
| 636 | return -EFAULT; |
| 637 | } |
| 638 | |
| 639 | qp->prev = vma; |
| 640 | |
Naoya Horiguchi | 6f4576e | 2015-02-11 15:28:03 -0800 | [diff] [blame] | 641 | if (flags & MPOL_MF_LAZY) { |
| 642 | /* Similar to task_numa_work, skip inaccessible VMAs */ |
Liang Chen | 4355c01 | 2016-03-15 14:56:42 -0700 | [diff] [blame] | 643 | if (!is_vm_hugetlb_page(vma) && |
| 644 | (vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE)) && |
| 645 | !(vma->vm_flags & VM_MIXEDMAP)) |
Naoya Horiguchi | 6f4576e | 2015-02-11 15:28:03 -0800 | [diff] [blame] | 646 | change_prot_numa(vma, start, endvma); |
| 647 | return 1; |
| 648 | } |
| 649 | |
Kirill A. Shutemov | 77bf45e | 2016-02-05 15:36:33 -0800 | [diff] [blame] | 650 | /* queue pages from current vma */ |
| 651 | if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) |
Naoya Horiguchi | 6f4576e | 2015-02-11 15:28:03 -0800 | [diff] [blame] | 652 | return 0; |
| 653 | return 1; |
| 654 | } |
| 655 | |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 656 | /* |
Naoya Horiguchi | 9809494 | 2013-09-11 14:22:14 -0700 | [diff] [blame] | 657 | * Walk through page tables and collect pages to be migrated. |
| 658 | * |
| 659 | * If pages found in a given range are on a set of nodes (determined by |
| 660 | * @nodes and @flags,) it's isolated and queued to the pagelist which is |
| 661 | * passed via @private.) |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 662 | */ |
Hugh Dickins | d05f0cdcb | 2014-06-23 13:22:07 -0700 | [diff] [blame] | 663 | static int |
Naoya Horiguchi | 9809494 | 2013-09-11 14:22:14 -0700 | [diff] [blame] | 664 | queue_pages_range(struct mm_struct *mm, unsigned long start, unsigned long end, |
Naoya Horiguchi | 6f4576e | 2015-02-11 15:28:03 -0800 | [diff] [blame] | 665 | nodemask_t *nodes, unsigned long flags, |
| 666 | struct list_head *pagelist) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | { |
Naoya Horiguchi | 6f4576e | 2015-02-11 15:28:03 -0800 | [diff] [blame] | 668 | struct queue_pages qp = { |
| 669 | .pagelist = pagelist, |
| 670 | .flags = flags, |
| 671 | .nmask = nodes, |
| 672 | .prev = NULL, |
| 673 | }; |
| 674 | struct mm_walk queue_pages_walk = { |
| 675 | .hugetlb_entry = queue_pages_hugetlb, |
| 676 | .pmd_entry = queue_pages_pte_range, |
| 677 | .test_walk = queue_pages_test_walk, |
| 678 | .mm = mm, |
| 679 | .private = &qp, |
| 680 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | |
Naoya Horiguchi | 6f4576e | 2015-02-11 15:28:03 -0800 | [diff] [blame] | 682 | return walk_page_range(start, end, &queue_pages_walk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | } |
| 684 | |
KOSAKI Motohiro | 869833f2 | 2012-10-08 16:29:16 -0700 | [diff] [blame] | 685 | /* |
| 686 | * Apply policy to a single VMA |
| 687 | * This must be called with the mmap_sem held for writing. |
| 688 | */ |
| 689 | static int vma_replace_policy(struct vm_area_struct *vma, |
| 690 | struct mempolicy *pol) |
KOSAKI Motohiro | 8d34694c1 | 2012-10-08 16:29:14 -0700 | [diff] [blame] | 691 | { |
KOSAKI Motohiro | 869833f2 | 2012-10-08 16:29:16 -0700 | [diff] [blame] | 692 | int err; |
| 693 | struct mempolicy *old; |
| 694 | struct mempolicy *new; |
KOSAKI Motohiro | 8d34694c1 | 2012-10-08 16:29:14 -0700 | [diff] [blame] | 695 | |
| 696 | pr_debug("vma %lx-%lx/%lx vm_ops %p vm_file %p set_policy %p\n", |
| 697 | vma->vm_start, vma->vm_end, vma->vm_pgoff, |
| 698 | vma->vm_ops, vma->vm_file, |
| 699 | vma->vm_ops ? vma->vm_ops->set_policy : NULL); |
| 700 | |
KOSAKI Motohiro | 869833f2 | 2012-10-08 16:29:16 -0700 | [diff] [blame] | 701 | new = mpol_dup(pol); |
| 702 | if (IS_ERR(new)) |
| 703 | return PTR_ERR(new); |
| 704 | |
| 705 | if (vma->vm_ops && vma->vm_ops->set_policy) { |
KOSAKI Motohiro | 8d34694c1 | 2012-10-08 16:29:14 -0700 | [diff] [blame] | 706 | err = vma->vm_ops->set_policy(vma, new); |
KOSAKI Motohiro | 869833f2 | 2012-10-08 16:29:16 -0700 | [diff] [blame] | 707 | if (err) |
| 708 | goto err_out; |
KOSAKI Motohiro | 8d34694c1 | 2012-10-08 16:29:14 -0700 | [diff] [blame] | 709 | } |
KOSAKI Motohiro | 869833f2 | 2012-10-08 16:29:16 -0700 | [diff] [blame] | 710 | |
| 711 | old = vma->vm_policy; |
| 712 | vma->vm_policy = new; /* protected by mmap_sem */ |
| 713 | mpol_put(old); |
| 714 | |
| 715 | return 0; |
| 716 | err_out: |
| 717 | mpol_put(new); |
KOSAKI Motohiro | 8d34694c1 | 2012-10-08 16:29:14 -0700 | [diff] [blame] | 718 | return err; |
| 719 | } |
| 720 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | /* Step 2: apply policy to a range and do splits. */ |
KOSAKI Motohiro | 9d8cebd | 2010-03-05 13:41:57 -0800 | [diff] [blame] | 722 | static int mbind_range(struct mm_struct *mm, unsigned long start, |
| 723 | unsigned long end, struct mempolicy *new_pol) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | { |
| 725 | struct vm_area_struct *next; |
KOSAKI Motohiro | 9d8cebd | 2010-03-05 13:41:57 -0800 | [diff] [blame] | 726 | struct vm_area_struct *prev; |
| 727 | struct vm_area_struct *vma; |
| 728 | int err = 0; |
KOSAKI Motohiro | e26a511 | 2011-12-28 15:57:11 -0800 | [diff] [blame] | 729 | pgoff_t pgoff; |
KOSAKI Motohiro | 9d8cebd | 2010-03-05 13:41:57 -0800 | [diff] [blame] | 730 | unsigned long vmstart; |
| 731 | unsigned long vmend; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | |
Linus Torvalds | 097d591 | 2012-03-06 18:23:36 -0800 | [diff] [blame] | 733 | vma = find_vma(mm, start); |
KOSAKI Motohiro | 9d8cebd | 2010-03-05 13:41:57 -0800 | [diff] [blame] | 734 | if (!vma || vma->vm_start > start) |
| 735 | return -EFAULT; |
| 736 | |
Linus Torvalds | 097d591 | 2012-03-06 18:23:36 -0800 | [diff] [blame] | 737 | prev = vma->vm_prev; |
KOSAKI Motohiro | e26a511 | 2011-12-28 15:57:11 -0800 | [diff] [blame] | 738 | if (start > vma->vm_start) |
| 739 | prev = vma; |
| 740 | |
KOSAKI Motohiro | 9d8cebd | 2010-03-05 13:41:57 -0800 | [diff] [blame] | 741 | for (; vma && vma->vm_start < end; prev = vma, vma = next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | next = vma->vm_next; |
KOSAKI Motohiro | 9d8cebd | 2010-03-05 13:41:57 -0800 | [diff] [blame] | 743 | vmstart = max(start, vma->vm_start); |
| 744 | vmend = min(end, vma->vm_end); |
| 745 | |
KOSAKI Motohiro | e26a511 | 2011-12-28 15:57:11 -0800 | [diff] [blame] | 746 | if (mpol_equal(vma_policy(vma), new_pol)) |
| 747 | continue; |
| 748 | |
| 749 | pgoff = vma->vm_pgoff + |
| 750 | ((vmstart - vma->vm_start) >> PAGE_SHIFT); |
KOSAKI Motohiro | 9d8cebd | 2010-03-05 13:41:57 -0800 | [diff] [blame] | 751 | prev = vma_merge(mm, prev, vmstart, vmend, vma->vm_flags, |
Andrea Arcangeli | 19a809a | 2015-09-04 15:46:24 -0700 | [diff] [blame] | 752 | vma->anon_vma, vma->vm_file, pgoff, |
| 753 | new_pol, vma->vm_userfaultfd_ctx); |
KOSAKI Motohiro | 9d8cebd | 2010-03-05 13:41:57 -0800 | [diff] [blame] | 754 | if (prev) { |
| 755 | vma = prev; |
| 756 | next = vma->vm_next; |
Oleg Nesterov | 3964acd | 2013-07-31 13:53:28 -0700 | [diff] [blame] | 757 | if (mpol_equal(vma_policy(vma), new_pol)) |
| 758 | continue; |
| 759 | /* vma_merge() joined vma && vma->next, case 8 */ |
| 760 | goto replace; |
KOSAKI Motohiro | 9d8cebd | 2010-03-05 13:41:57 -0800 | [diff] [blame] | 761 | } |
| 762 | if (vma->vm_start != vmstart) { |
| 763 | err = split_vma(vma->vm_mm, vma, vmstart, 1); |
| 764 | if (err) |
| 765 | goto out; |
| 766 | } |
| 767 | if (vma->vm_end != vmend) { |
| 768 | err = split_vma(vma->vm_mm, vma, vmend, 0); |
| 769 | if (err) |
| 770 | goto out; |
| 771 | } |
Oleg Nesterov | 3964acd | 2013-07-31 13:53:28 -0700 | [diff] [blame] | 772 | replace: |
KOSAKI Motohiro | 869833f2 | 2012-10-08 16:29:16 -0700 | [diff] [blame] | 773 | err = vma_replace_policy(vma, new_pol); |
KOSAKI Motohiro | 8d34694c1 | 2012-10-08 16:29:14 -0700 | [diff] [blame] | 774 | if (err) |
| 775 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | } |
KOSAKI Motohiro | 9d8cebd | 2010-03-05 13:41:57 -0800 | [diff] [blame] | 777 | |
| 778 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | return err; |
| 780 | } |
| 781 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | /* Set the process memory policy */ |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 783 | static long do_set_mempolicy(unsigned short mode, unsigned short flags, |
| 784 | nodemask_t *nodes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | { |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 786 | struct mempolicy *new, *old; |
KAMEZAWA Hiroyuki | 4bfc449 | 2009-08-06 15:07:33 -0700 | [diff] [blame] | 787 | NODEMASK_SCRATCH(scratch); |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 788 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | |
KAMEZAWA Hiroyuki | 4bfc449 | 2009-08-06 15:07:33 -0700 | [diff] [blame] | 790 | if (!scratch) |
| 791 | return -ENOMEM; |
Lee Schermerhorn | f4e53d9 | 2008-04-28 02:13:10 -0700 | [diff] [blame] | 792 | |
KAMEZAWA Hiroyuki | 4bfc449 | 2009-08-06 15:07:33 -0700 | [diff] [blame] | 793 | new = mpol_new(mode, flags, nodes); |
| 794 | if (IS_ERR(new)) { |
| 795 | ret = PTR_ERR(new); |
| 796 | goto out; |
| 797 | } |
Oleg Nesterov | 2c7c3a7 | 2014-10-09 15:27:55 -0700 | [diff] [blame] | 798 | |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 799 | task_lock(current); |
KAMEZAWA Hiroyuki | 4bfc449 | 2009-08-06 15:07:33 -0700 | [diff] [blame] | 800 | ret = mpol_set_nodemask(new, nodes, scratch); |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 801 | if (ret) { |
| 802 | task_unlock(current); |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 803 | mpol_put(new); |
KAMEZAWA Hiroyuki | 4bfc449 | 2009-08-06 15:07:33 -0700 | [diff] [blame] | 804 | goto out; |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 805 | } |
| 806 | old = current->mempolicy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | current->mempolicy = new; |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 808 | if (new && new->mode == MPOL_INTERLEAVE && |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 809 | nodes_weight(new->v.nodes)) |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 810 | current->il_next = first_node(new->v.nodes); |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 811 | task_unlock(current); |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 812 | mpol_put(old); |
KAMEZAWA Hiroyuki | 4bfc449 | 2009-08-06 15:07:33 -0700 | [diff] [blame] | 813 | ret = 0; |
| 814 | out: |
| 815 | NODEMASK_SCRATCH_FREE(scratch); |
| 816 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | } |
| 818 | |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 819 | /* |
| 820 | * Return nodemask for policy for get_mempolicy() query |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 821 | * |
| 822 | * Called with task's alloc_lock held |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 823 | */ |
| 824 | static void get_policy_nodemask(struct mempolicy *p, nodemask_t *nodes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | { |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 826 | nodes_clear(*nodes); |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 827 | if (p == &default_policy) |
| 828 | return; |
| 829 | |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 830 | switch (p->mode) { |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 831 | case MPOL_BIND: |
| 832 | /* Fall through */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | case MPOL_INTERLEAVE: |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 834 | *nodes = p->v.nodes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | break; |
| 836 | case MPOL_PREFERRED: |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 837 | if (!(p->flags & MPOL_F_LOCAL)) |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 838 | node_set(p->v.preferred_node, *nodes); |
Lee Schermerhorn | 53f2556 | 2008-04-28 02:13:20 -0700 | [diff] [blame] | 839 | /* else return empty node mask for local allocation */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | break; |
| 841 | default: |
| 842 | BUG(); |
| 843 | } |
| 844 | } |
| 845 | |
Dave Hansen | d4edcf0 | 2016-02-12 13:01:56 -0800 | [diff] [blame] | 846 | static int lookup_node(unsigned long addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | { |
| 848 | struct page *p; |
| 849 | int err; |
| 850 | |
Dave Hansen | d4edcf0 | 2016-02-12 13:01:56 -0800 | [diff] [blame] | 851 | err = get_user_pages(addr & PAGE_MASK, 1, 0, 0, &p, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | if (err >= 0) { |
| 853 | err = page_to_nid(p); |
| 854 | put_page(p); |
| 855 | } |
| 856 | return err; |
| 857 | } |
| 858 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | /* Retrieve NUMA policy */ |
Adrian Bunk | dbcb0f1 | 2007-10-16 01:26:26 -0700 | [diff] [blame] | 860 | static long do_get_mempolicy(int *policy, nodemask_t *nmask, |
| 861 | unsigned long addr, unsigned long flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | { |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 863 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | struct mm_struct *mm = current->mm; |
| 865 | struct vm_area_struct *vma = NULL; |
| 866 | struct mempolicy *pol = current->mempolicy; |
| 867 | |
Lee Schermerhorn | 754af6f | 2007-10-16 01:24:51 -0700 | [diff] [blame] | 868 | if (flags & |
| 869 | ~(unsigned long)(MPOL_F_NODE|MPOL_F_ADDR|MPOL_F_MEMS_ALLOWED)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | return -EINVAL; |
Lee Schermerhorn | 754af6f | 2007-10-16 01:24:51 -0700 | [diff] [blame] | 871 | |
| 872 | if (flags & MPOL_F_MEMS_ALLOWED) { |
| 873 | if (flags & (MPOL_F_NODE|MPOL_F_ADDR)) |
| 874 | return -EINVAL; |
| 875 | *policy = 0; /* just so it's initialized */ |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 876 | task_lock(current); |
Lee Schermerhorn | 754af6f | 2007-10-16 01:24:51 -0700 | [diff] [blame] | 877 | *nmask = cpuset_current_mems_allowed; |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 878 | task_unlock(current); |
Lee Schermerhorn | 754af6f | 2007-10-16 01:24:51 -0700 | [diff] [blame] | 879 | return 0; |
| 880 | } |
| 881 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | if (flags & MPOL_F_ADDR) { |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 883 | /* |
| 884 | * Do NOT fall back to task policy if the |
| 885 | * vma/shared policy at addr is NULL. We |
| 886 | * want to return MPOL_DEFAULT in this case. |
| 887 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | down_read(&mm->mmap_sem); |
| 889 | vma = find_vma_intersection(mm, addr, addr+1); |
| 890 | if (!vma) { |
| 891 | up_read(&mm->mmap_sem); |
| 892 | return -EFAULT; |
| 893 | } |
| 894 | if (vma->vm_ops && vma->vm_ops->get_policy) |
| 895 | pol = vma->vm_ops->get_policy(vma, addr); |
| 896 | else |
| 897 | pol = vma->vm_policy; |
| 898 | } else if (addr) |
| 899 | return -EINVAL; |
| 900 | |
| 901 | if (!pol) |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 902 | pol = &default_policy; /* indicates default behavior */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | |
| 904 | if (flags & MPOL_F_NODE) { |
| 905 | if (flags & MPOL_F_ADDR) { |
Dave Hansen | d4edcf0 | 2016-02-12 13:01:56 -0800 | [diff] [blame] | 906 | err = lookup_node(addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | if (err < 0) |
| 908 | goto out; |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 909 | *policy = err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 910 | } else if (pol == current->mempolicy && |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 911 | pol->mode == MPOL_INTERLEAVE) { |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 912 | *policy = current->il_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | } else { |
| 914 | err = -EINVAL; |
| 915 | goto out; |
| 916 | } |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 917 | } else { |
| 918 | *policy = pol == &default_policy ? MPOL_DEFAULT : |
| 919 | pol->mode; |
David Rientjes | d79df63 | 2008-07-04 12:24:13 -0700 | [diff] [blame] | 920 | /* |
| 921 | * Internal mempolicy flags must be masked off before exposing |
| 922 | * the policy to userspace. |
| 923 | */ |
| 924 | *policy |= (pol->flags & MPOL_MODE_FLAGS); |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 925 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | |
| 927 | if (vma) { |
| 928 | up_read(¤t->mm->mmap_sem); |
| 929 | vma = NULL; |
| 930 | } |
| 931 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | err = 0; |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 933 | if (nmask) { |
Lee Schermerhorn | c6b6ef8 | 2010-03-23 13:35:41 -0700 | [diff] [blame] | 934 | if (mpol_store_user_nodemask(pol)) { |
| 935 | *nmask = pol->w.user_nodemask; |
| 936 | } else { |
| 937 | task_lock(current); |
| 938 | get_policy_nodemask(pol, nmask); |
| 939 | task_unlock(current); |
| 940 | } |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 941 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | |
| 943 | out: |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 944 | mpol_cond_put(pol); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | if (vma) |
| 946 | up_read(¤t->mm->mmap_sem); |
| 947 | return err; |
| 948 | } |
| 949 | |
Christoph Lameter | b20a350 | 2006-03-22 00:09:12 -0800 | [diff] [blame] | 950 | #ifdef CONFIG_MIGRATION |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 951 | /* |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 952 | * page migration |
| 953 | */ |
Christoph Lameter | fc30128 | 2006-01-18 17:42:29 -0800 | [diff] [blame] | 954 | static void migrate_page_add(struct page *page, struct list_head *pagelist, |
| 955 | unsigned long flags) |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 956 | { |
| 957 | /* |
Christoph Lameter | fc30128 | 2006-01-18 17:42:29 -0800 | [diff] [blame] | 958 | * Avoid migrating a page that is shared with others. |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 959 | */ |
Nick Piggin | 62695a8 | 2008-10-18 20:26:09 -0700 | [diff] [blame] | 960 | if ((flags & MPOL_MF_MOVE_ALL) || page_mapcount(page) == 1) { |
| 961 | if (!isolate_lru_page(page)) { |
| 962 | list_add_tail(&page->lru, pagelist); |
KOSAKI Motohiro | 6d9c285 | 2009-12-14 17:58:11 -0800 | [diff] [blame] | 963 | inc_zone_page_state(page, NR_ISOLATED_ANON + |
| 964 | page_is_file_cache(page)); |
Nick Piggin | 62695a8 | 2008-10-18 20:26:09 -0700 | [diff] [blame] | 965 | } |
| 966 | } |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 967 | } |
| 968 | |
Christoph Lameter | 742755a | 2006-06-23 02:03:55 -0700 | [diff] [blame] | 969 | static struct page *new_node_page(struct page *page, unsigned long node, int **x) |
Christoph Lameter | 95a402c | 2006-06-23 02:03:53 -0700 | [diff] [blame] | 970 | { |
Naoya Horiguchi | e2d8cf4 | 2013-09-11 14:22:03 -0700 | [diff] [blame] | 971 | if (PageHuge(page)) |
| 972 | return alloc_huge_page_node(page_hstate(compound_head(page)), |
| 973 | node); |
| 974 | else |
Vlastimil Babka | 96db800 | 2015-09-08 15:03:50 -0700 | [diff] [blame] | 975 | return __alloc_pages_node(node, GFP_HIGHUSER_MOVABLE | |
David Rientjes | b360edb | 2015-04-14 15:46:52 -0700 | [diff] [blame] | 976 | __GFP_THISNODE, 0); |
Christoph Lameter | 95a402c | 2006-06-23 02:03:53 -0700 | [diff] [blame] | 977 | } |
| 978 | |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 979 | /* |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 980 | * Migrate pages from one node to a target node. |
| 981 | * Returns error or the number of pages not migrated. |
| 982 | */ |
Adrian Bunk | dbcb0f1 | 2007-10-16 01:26:26 -0700 | [diff] [blame] | 983 | static int migrate_to_node(struct mm_struct *mm, int source, int dest, |
| 984 | int flags) |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 985 | { |
| 986 | nodemask_t nmask; |
| 987 | LIST_HEAD(pagelist); |
| 988 | int err = 0; |
| 989 | |
| 990 | nodes_clear(nmask); |
| 991 | node_set(source, nmask); |
| 992 | |
Minchan Kim | 0827080 | 2012-10-08 16:33:38 -0700 | [diff] [blame] | 993 | /* |
| 994 | * This does not "check" the range but isolates all pages that |
| 995 | * need migration. Between passing in the full user address |
| 996 | * space range and MPOL_MF_DISCONTIG_OK, this call can not fail. |
| 997 | */ |
| 998 | VM_BUG_ON(!(flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL))); |
Naoya Horiguchi | 9809494 | 2013-09-11 14:22:14 -0700 | [diff] [blame] | 999 | queue_pages_range(mm, mm->mmap->vm_start, mm->task_size, &nmask, |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 1000 | flags | MPOL_MF_DISCONTIG_OK, &pagelist); |
| 1001 | |
Minchan Kim | cf608ac | 2010-10-26 14:21:29 -0700 | [diff] [blame] | 1002 | if (!list_empty(&pagelist)) { |
David Rientjes | 68711a7 | 2014-06-04 16:08:25 -0700 | [diff] [blame] | 1003 | err = migrate_pages(&pagelist, new_node_page, NULL, dest, |
Hugh Dickins | 9c620e2 | 2013-02-22 16:35:14 -0800 | [diff] [blame] | 1004 | MIGRATE_SYNC, MR_SYSCALL); |
Minchan Kim | cf608ac | 2010-10-26 14:21:29 -0700 | [diff] [blame] | 1005 | if (err) |
Naoya Horiguchi | e2d8cf4 | 2013-09-11 14:22:03 -0700 | [diff] [blame] | 1006 | putback_movable_pages(&pagelist); |
Minchan Kim | cf608ac | 2010-10-26 14:21:29 -0700 | [diff] [blame] | 1007 | } |
Christoph Lameter | 95a402c | 2006-06-23 02:03:53 -0700 | [diff] [blame] | 1008 | |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 1009 | return err; |
| 1010 | } |
| 1011 | |
| 1012 | /* |
| 1013 | * Move pages between the two nodesets so as to preserve the physical |
| 1014 | * layout as much as possible. |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1015 | * |
| 1016 | * Returns the number of page that could not be moved. |
| 1017 | */ |
Andrew Morton | 0ce72d4 | 2012-05-29 15:06:24 -0700 | [diff] [blame] | 1018 | int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from, |
| 1019 | const nodemask_t *to, int flags) |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1020 | { |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 1021 | int busy = 0; |
Christoph Lameter | 0aedadf | 2008-11-06 12:53:30 -0800 | [diff] [blame] | 1022 | int err; |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 1023 | nodemask_t tmp; |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1024 | |
Christoph Lameter | 0aedadf | 2008-11-06 12:53:30 -0800 | [diff] [blame] | 1025 | err = migrate_prep(); |
| 1026 | if (err) |
| 1027 | return err; |
| 1028 | |
Lee Schermerhorn | 53f2556 | 2008-04-28 02:13:20 -0700 | [diff] [blame] | 1029 | down_read(&mm->mmap_sem); |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1030 | |
KOSAKI Motohiro | da0aa13 | 2010-03-05 13:41:59 -0800 | [diff] [blame] | 1031 | /* |
| 1032 | * Find a 'source' bit set in 'tmp' whose corresponding 'dest' |
| 1033 | * bit in 'to' is not also set in 'tmp'. Clear the found 'source' |
| 1034 | * bit in 'tmp', and return that <source, dest> pair for migration. |
| 1035 | * The pair of nodemasks 'to' and 'from' define the map. |
| 1036 | * |
| 1037 | * If no pair of bits is found that way, fallback to picking some |
| 1038 | * pair of 'source' and 'dest' bits that are not the same. If the |
| 1039 | * 'source' and 'dest' bits are the same, this represents a node |
| 1040 | * that will be migrating to itself, so no pages need move. |
| 1041 | * |
| 1042 | * If no bits are left in 'tmp', or if all remaining bits left |
| 1043 | * in 'tmp' correspond to the same bit in 'to', return false |
| 1044 | * (nothing left to migrate). |
| 1045 | * |
| 1046 | * This lets us pick a pair of nodes to migrate between, such that |
| 1047 | * if possible the dest node is not already occupied by some other |
| 1048 | * source node, minimizing the risk of overloading the memory on a |
| 1049 | * node that would happen if we migrated incoming memory to a node |
| 1050 | * before migrating outgoing memory source that same node. |
| 1051 | * |
| 1052 | * A single scan of tmp is sufficient. As we go, we remember the |
| 1053 | * most recent <s, d> pair that moved (s != d). If we find a pair |
| 1054 | * that not only moved, but what's better, moved to an empty slot |
| 1055 | * (d is not set in tmp), then we break out then, with that pair. |
Justin P. Mattock | ae0e47f | 2011-03-01 15:06:02 +0100 | [diff] [blame] | 1056 | * Otherwise when we finish scanning from_tmp, we at least have the |
KOSAKI Motohiro | da0aa13 | 2010-03-05 13:41:59 -0800 | [diff] [blame] | 1057 | * most recent <s, d> pair that moved. If we get all the way through |
| 1058 | * the scan of tmp without finding any node that moved, much less |
| 1059 | * moved to an empty node, then there is nothing left worth migrating. |
| 1060 | */ |
Christoph Lameter | d498471 | 2006-01-08 01:00:55 -0800 | [diff] [blame] | 1061 | |
Andrew Morton | 0ce72d4 | 2012-05-29 15:06:24 -0700 | [diff] [blame] | 1062 | tmp = *from; |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 1063 | while (!nodes_empty(tmp)) { |
| 1064 | int s,d; |
Jianguo Wu | b76ac7e | 2013-11-12 15:07:39 -0800 | [diff] [blame] | 1065 | int source = NUMA_NO_NODE; |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 1066 | int dest = 0; |
| 1067 | |
| 1068 | for_each_node_mask(s, tmp) { |
Larry Woodman | 4a5b18c | 2012-05-29 15:06:24 -0700 | [diff] [blame] | 1069 | |
| 1070 | /* |
| 1071 | * do_migrate_pages() tries to maintain the relative |
| 1072 | * node relationship of the pages established between |
| 1073 | * threads and memory areas. |
| 1074 | * |
| 1075 | * However if the number of source nodes is not equal to |
| 1076 | * the number of destination nodes we can not preserve |
| 1077 | * this node relative relationship. In that case, skip |
| 1078 | * copying memory from a node that is in the destination |
| 1079 | * mask. |
| 1080 | * |
| 1081 | * Example: [2,3,4] -> [3,4,5] moves everything. |
| 1082 | * [0-7] - > [3,4,5] moves only 0,1,2,6,7. |
| 1083 | */ |
| 1084 | |
Andrew Morton | 0ce72d4 | 2012-05-29 15:06:24 -0700 | [diff] [blame] | 1085 | if ((nodes_weight(*from) != nodes_weight(*to)) && |
| 1086 | (node_isset(s, *to))) |
Larry Woodman | 4a5b18c | 2012-05-29 15:06:24 -0700 | [diff] [blame] | 1087 | continue; |
| 1088 | |
Andrew Morton | 0ce72d4 | 2012-05-29 15:06:24 -0700 | [diff] [blame] | 1089 | d = node_remap(s, *from, *to); |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 1090 | if (s == d) |
| 1091 | continue; |
| 1092 | |
| 1093 | source = s; /* Node moved. Memorize */ |
| 1094 | dest = d; |
| 1095 | |
| 1096 | /* dest not in remaining from nodes? */ |
| 1097 | if (!node_isset(dest, tmp)) |
| 1098 | break; |
| 1099 | } |
Jianguo Wu | b76ac7e | 2013-11-12 15:07:39 -0800 | [diff] [blame] | 1100 | if (source == NUMA_NO_NODE) |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 1101 | break; |
| 1102 | |
| 1103 | node_clear(source, tmp); |
| 1104 | err = migrate_to_node(mm, source, dest, flags); |
| 1105 | if (err > 0) |
| 1106 | busy += err; |
| 1107 | if (err < 0) |
| 1108 | break; |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1109 | } |
| 1110 | up_read(&mm->mmap_sem); |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 1111 | if (err < 0) |
| 1112 | return err; |
| 1113 | return busy; |
Christoph Lameter | b20a350 | 2006-03-22 00:09:12 -0800 | [diff] [blame] | 1114 | |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1115 | } |
| 1116 | |
Lee Schermerhorn | 3ad33b2 | 2007-11-14 16:59:10 -0800 | [diff] [blame] | 1117 | /* |
| 1118 | * Allocate a new page for page migration based on vma policy. |
Hugh Dickins | d05f0cdcb | 2014-06-23 13:22:07 -0700 | [diff] [blame] | 1119 | * Start by assuming the page is mapped by the same vma as contains @start. |
Lee Schermerhorn | 3ad33b2 | 2007-11-14 16:59:10 -0800 | [diff] [blame] | 1120 | * Search forward from there, if not. N.B., this assumes that the |
| 1121 | * list of pages handed to migrate_pages()--which is how we get here-- |
| 1122 | * is in virtual address order. |
| 1123 | */ |
Hugh Dickins | d05f0cdcb | 2014-06-23 13:22:07 -0700 | [diff] [blame] | 1124 | static struct page *new_page(struct page *page, unsigned long start, int **x) |
Christoph Lameter | 95a402c | 2006-06-23 02:03:53 -0700 | [diff] [blame] | 1125 | { |
Hugh Dickins | d05f0cdcb | 2014-06-23 13:22:07 -0700 | [diff] [blame] | 1126 | struct vm_area_struct *vma; |
Lee Schermerhorn | 3ad33b2 | 2007-11-14 16:59:10 -0800 | [diff] [blame] | 1127 | unsigned long uninitialized_var(address); |
Christoph Lameter | 95a402c | 2006-06-23 02:03:53 -0700 | [diff] [blame] | 1128 | |
Hugh Dickins | d05f0cdcb | 2014-06-23 13:22:07 -0700 | [diff] [blame] | 1129 | vma = find_vma(current->mm, start); |
Lee Schermerhorn | 3ad33b2 | 2007-11-14 16:59:10 -0800 | [diff] [blame] | 1130 | while (vma) { |
| 1131 | address = page_address_in_vma(page, vma); |
| 1132 | if (address != -EFAULT) |
| 1133 | break; |
| 1134 | vma = vma->vm_next; |
| 1135 | } |
| 1136 | |
Wanpeng Li | 11c731e | 2013-12-18 17:08:56 -0800 | [diff] [blame] | 1137 | if (PageHuge(page)) { |
Michal Hocko | cc81717 | 2014-01-23 15:53:15 -0800 | [diff] [blame] | 1138 | BUG_ON(!vma); |
| 1139 | return alloc_huge_page_noerr(vma, address, 1); |
Wanpeng Li | 11c731e | 2013-12-18 17:08:56 -0800 | [diff] [blame] | 1140 | } |
| 1141 | /* |
| 1142 | * if !vma, alloc_page_vma() will use task or system default policy |
| 1143 | */ |
Lee Schermerhorn | 3ad33b2 | 2007-11-14 16:59:10 -0800 | [diff] [blame] | 1144 | return alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma, address); |
Christoph Lameter | 95a402c | 2006-06-23 02:03:53 -0700 | [diff] [blame] | 1145 | } |
Christoph Lameter | b20a350 | 2006-03-22 00:09:12 -0800 | [diff] [blame] | 1146 | #else |
| 1147 | |
| 1148 | static void migrate_page_add(struct page *page, struct list_head *pagelist, |
| 1149 | unsigned long flags) |
| 1150 | { |
| 1151 | } |
| 1152 | |
Andrew Morton | 0ce72d4 | 2012-05-29 15:06:24 -0700 | [diff] [blame] | 1153 | int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from, |
| 1154 | const nodemask_t *to, int flags) |
Christoph Lameter | b20a350 | 2006-03-22 00:09:12 -0800 | [diff] [blame] | 1155 | { |
| 1156 | return -ENOSYS; |
| 1157 | } |
Christoph Lameter | 95a402c | 2006-06-23 02:03:53 -0700 | [diff] [blame] | 1158 | |
Hugh Dickins | d05f0cdcb | 2014-06-23 13:22:07 -0700 | [diff] [blame] | 1159 | static struct page *new_page(struct page *page, unsigned long start, int **x) |
Christoph Lameter | 95a402c | 2006-06-23 02:03:53 -0700 | [diff] [blame] | 1160 | { |
| 1161 | return NULL; |
| 1162 | } |
Christoph Lameter | b20a350 | 2006-03-22 00:09:12 -0800 | [diff] [blame] | 1163 | #endif |
| 1164 | |
Adrian Bunk | dbcb0f1 | 2007-10-16 01:26:26 -0700 | [diff] [blame] | 1165 | static long do_mbind(unsigned long start, unsigned long len, |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 1166 | unsigned short mode, unsigned short mode_flags, |
| 1167 | nodemask_t *nmask, unsigned long flags) |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 1168 | { |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 1169 | struct mm_struct *mm = current->mm; |
| 1170 | struct mempolicy *new; |
| 1171 | unsigned long end; |
| 1172 | int err; |
| 1173 | LIST_HEAD(pagelist); |
| 1174 | |
Lee Schermerhorn | b24f53a | 2012-10-25 14:16:32 +0200 | [diff] [blame] | 1175 | if (flags & ~(unsigned long)MPOL_MF_VALID) |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 1176 | return -EINVAL; |
Christoph Lameter | 74c0024 | 2006-03-14 19:50:21 -0800 | [diff] [blame] | 1177 | if ((flags & MPOL_MF_MOVE_ALL) && !capable(CAP_SYS_NICE)) |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 1178 | return -EPERM; |
| 1179 | |
| 1180 | if (start & ~PAGE_MASK) |
| 1181 | return -EINVAL; |
| 1182 | |
| 1183 | if (mode == MPOL_DEFAULT) |
| 1184 | flags &= ~MPOL_MF_STRICT; |
| 1185 | |
| 1186 | len = (len + PAGE_SIZE - 1) & PAGE_MASK; |
| 1187 | end = start + len; |
| 1188 | |
| 1189 | if (end < start) |
| 1190 | return -EINVAL; |
| 1191 | if (end == start) |
| 1192 | return 0; |
| 1193 | |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 1194 | new = mpol_new(mode, mode_flags, nmask); |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 1195 | if (IS_ERR(new)) |
| 1196 | return PTR_ERR(new); |
| 1197 | |
Lee Schermerhorn | b24f53a | 2012-10-25 14:16:32 +0200 | [diff] [blame] | 1198 | if (flags & MPOL_MF_LAZY) |
| 1199 | new->flags |= MPOL_F_MOF; |
| 1200 | |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 1201 | /* |
| 1202 | * If we are using the default policy then operation |
| 1203 | * on discontinuous address spaces is okay after all |
| 1204 | */ |
| 1205 | if (!new) |
| 1206 | flags |= MPOL_MF_DISCONTIG_OK; |
| 1207 | |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 1208 | pr_debug("mbind %lx-%lx mode:%d flags:%d nodes:%lx\n", |
| 1209 | start, start + len, mode, mode_flags, |
David Rientjes | 00ef2d2 | 2013-02-22 16:35:36 -0800 | [diff] [blame] | 1210 | nmask ? nodes_addr(*nmask)[0] : NUMA_NO_NODE); |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 1211 | |
Christoph Lameter | 0aedadf | 2008-11-06 12:53:30 -0800 | [diff] [blame] | 1212 | if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) { |
| 1213 | |
| 1214 | err = migrate_prep(); |
| 1215 | if (err) |
KOSAKI Motohiro | b05ca73 | 2009-10-26 16:49:59 -0700 | [diff] [blame] | 1216 | goto mpol_out; |
Christoph Lameter | 0aedadf | 2008-11-06 12:53:30 -0800 | [diff] [blame] | 1217 | } |
KAMEZAWA Hiroyuki | 4bfc449 | 2009-08-06 15:07:33 -0700 | [diff] [blame] | 1218 | { |
| 1219 | NODEMASK_SCRATCH(scratch); |
| 1220 | if (scratch) { |
| 1221 | down_write(&mm->mmap_sem); |
| 1222 | task_lock(current); |
| 1223 | err = mpol_set_nodemask(new, nmask, scratch); |
| 1224 | task_unlock(current); |
| 1225 | if (err) |
| 1226 | up_write(&mm->mmap_sem); |
| 1227 | } else |
| 1228 | err = -ENOMEM; |
| 1229 | NODEMASK_SCRATCH_FREE(scratch); |
| 1230 | } |
KOSAKI Motohiro | b05ca73 | 2009-10-26 16:49:59 -0700 | [diff] [blame] | 1231 | if (err) |
| 1232 | goto mpol_out; |
| 1233 | |
Hugh Dickins | d05f0cdcb | 2014-06-23 13:22:07 -0700 | [diff] [blame] | 1234 | err = queue_pages_range(mm, start, end, nmask, |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 1235 | flags | MPOL_MF_INVERT, &pagelist); |
Hugh Dickins | d05f0cdcb | 2014-06-23 13:22:07 -0700 | [diff] [blame] | 1236 | if (!err) |
KOSAKI Motohiro | 9d8cebd | 2010-03-05 13:41:57 -0800 | [diff] [blame] | 1237 | err = mbind_range(mm, start, end, new); |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 1238 | |
Lee Schermerhorn | b24f53a | 2012-10-25 14:16:32 +0200 | [diff] [blame] | 1239 | if (!err) { |
| 1240 | int nr_failed = 0; |
| 1241 | |
Minchan Kim | cf608ac | 2010-10-26 14:21:29 -0700 | [diff] [blame] | 1242 | if (!list_empty(&pagelist)) { |
Lee Schermerhorn | b24f53a | 2012-10-25 14:16:32 +0200 | [diff] [blame] | 1243 | WARN_ON_ONCE(flags & MPOL_MF_LAZY); |
Hugh Dickins | d05f0cdcb | 2014-06-23 13:22:07 -0700 | [diff] [blame] | 1244 | nr_failed = migrate_pages(&pagelist, new_page, NULL, |
| 1245 | start, MIGRATE_SYNC, MR_MEMPOLICY_MBIND); |
Minchan Kim | cf608ac | 2010-10-26 14:21:29 -0700 | [diff] [blame] | 1246 | if (nr_failed) |
Naoya Horiguchi | 74060e4 | 2013-09-11 14:22:06 -0700 | [diff] [blame] | 1247 | putback_movable_pages(&pagelist); |
Minchan Kim | cf608ac | 2010-10-26 14:21:29 -0700 | [diff] [blame] | 1248 | } |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 1249 | |
Lee Schermerhorn | b24f53a | 2012-10-25 14:16:32 +0200 | [diff] [blame] | 1250 | if (nr_failed && (flags & MPOL_MF_STRICT)) |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 1251 | err = -EIO; |
KOSAKI Motohiro | ab8a3e1 | 2009-10-26 16:49:58 -0700 | [diff] [blame] | 1252 | } else |
Joonsoo Kim | b0e5fd7 | 2013-12-18 17:08:51 -0800 | [diff] [blame] | 1253 | putback_movable_pages(&pagelist); |
Christoph Lameter | b20a350 | 2006-03-22 00:09:12 -0800 | [diff] [blame] | 1254 | |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 1255 | up_write(&mm->mmap_sem); |
KOSAKI Motohiro | b05ca73 | 2009-10-26 16:49:59 -0700 | [diff] [blame] | 1256 | mpol_out: |
Lee Schermerhorn | f0be3d3 | 2008-04-28 02:13:08 -0700 | [diff] [blame] | 1257 | mpol_put(new); |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 1258 | return err; |
| 1259 | } |
| 1260 | |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1261 | /* |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1262 | * User space interface with variable sized bitmaps for nodelists. |
| 1263 | */ |
| 1264 | |
| 1265 | /* Copy a node mask from user space. */ |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1266 | static int get_nodes(nodemask_t *nodes, const unsigned long __user *nmask, |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1267 | unsigned long maxnode) |
| 1268 | { |
| 1269 | unsigned long k; |
| 1270 | unsigned long nlongs; |
| 1271 | unsigned long endmask; |
| 1272 | |
| 1273 | --maxnode; |
| 1274 | nodes_clear(*nodes); |
| 1275 | if (maxnode == 0 || !nmask) |
| 1276 | return 0; |
Andi Kleen | a9c930b | 2006-02-20 18:27:59 -0800 | [diff] [blame] | 1277 | if (maxnode > PAGE_SIZE*BITS_PER_BYTE) |
Chris Wright | 636f13c | 2006-02-17 13:59:36 -0800 | [diff] [blame] | 1278 | return -EINVAL; |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1279 | |
| 1280 | nlongs = BITS_TO_LONGS(maxnode); |
| 1281 | if ((maxnode % BITS_PER_LONG) == 0) |
| 1282 | endmask = ~0UL; |
| 1283 | else |
| 1284 | endmask = (1UL << (maxnode % BITS_PER_LONG)) - 1; |
| 1285 | |
| 1286 | /* When the user specified more nodes than supported just check |
| 1287 | if the non supported part is all zero. */ |
| 1288 | if (nlongs > BITS_TO_LONGS(MAX_NUMNODES)) { |
| 1289 | if (nlongs > PAGE_SIZE/sizeof(long)) |
| 1290 | return -EINVAL; |
| 1291 | for (k = BITS_TO_LONGS(MAX_NUMNODES); k < nlongs; k++) { |
| 1292 | unsigned long t; |
| 1293 | if (get_user(t, nmask + k)) |
| 1294 | return -EFAULT; |
| 1295 | if (k == nlongs - 1) { |
| 1296 | if (t & endmask) |
| 1297 | return -EINVAL; |
| 1298 | } else if (t) |
| 1299 | return -EINVAL; |
| 1300 | } |
| 1301 | nlongs = BITS_TO_LONGS(MAX_NUMNODES); |
| 1302 | endmask = ~0UL; |
| 1303 | } |
| 1304 | |
| 1305 | if (copy_from_user(nodes_addr(*nodes), nmask, nlongs*sizeof(unsigned long))) |
| 1306 | return -EFAULT; |
| 1307 | nodes_addr(*nodes)[nlongs-1] &= endmask; |
| 1308 | return 0; |
| 1309 | } |
| 1310 | |
| 1311 | /* Copy a kernel node mask to user space */ |
| 1312 | static int copy_nodes_to_user(unsigned long __user *mask, unsigned long maxnode, |
| 1313 | nodemask_t *nodes) |
| 1314 | { |
| 1315 | unsigned long copy = ALIGN(maxnode-1, 64) / 8; |
| 1316 | const int nbytes = BITS_TO_LONGS(MAX_NUMNODES) * sizeof(long); |
| 1317 | |
| 1318 | if (copy > nbytes) { |
| 1319 | if (copy > PAGE_SIZE) |
| 1320 | return -EINVAL; |
| 1321 | if (clear_user((char __user *)mask + nbytes, copy - nbytes)) |
| 1322 | return -EFAULT; |
| 1323 | copy = nbytes; |
| 1324 | } |
| 1325 | return copy_to_user(mask, nodes_addr(*nodes), copy) ? -EFAULT : 0; |
| 1326 | } |
| 1327 | |
Heiko Carstens | 938bb9f | 2009-01-14 14:14:30 +0100 | [diff] [blame] | 1328 | SYSCALL_DEFINE6(mbind, unsigned long, start, unsigned long, len, |
Rasmus Villemoes | f7f28ca | 2014-06-04 16:07:57 -0700 | [diff] [blame] | 1329 | unsigned long, mode, const unsigned long __user *, nmask, |
Heiko Carstens | 938bb9f | 2009-01-14 14:14:30 +0100 | [diff] [blame] | 1330 | unsigned long, maxnode, unsigned, flags) |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1331 | { |
| 1332 | nodemask_t nodes; |
| 1333 | int err; |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 1334 | unsigned short mode_flags; |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1335 | |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 1336 | mode_flags = mode & MPOL_MODE_FLAGS; |
| 1337 | mode &= ~MPOL_MODE_FLAGS; |
David Rientjes | a3b51e0 | 2008-04-28 02:12:23 -0700 | [diff] [blame] | 1338 | if (mode >= MPOL_MAX) |
| 1339 | return -EINVAL; |
David Rientjes | 4c50bc0 | 2008-04-28 02:12:30 -0700 | [diff] [blame] | 1340 | if ((mode_flags & MPOL_F_STATIC_NODES) && |
| 1341 | (mode_flags & MPOL_F_RELATIVE_NODES)) |
| 1342 | return -EINVAL; |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1343 | err = get_nodes(&nodes, nmask, maxnode); |
| 1344 | if (err) |
| 1345 | return err; |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 1346 | return do_mbind(start, len, mode, mode_flags, &nodes, flags); |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1347 | } |
| 1348 | |
| 1349 | /* Set the process memory policy */ |
Rasmus Villemoes | 23c8902 | 2014-06-04 16:07:58 -0700 | [diff] [blame] | 1350 | SYSCALL_DEFINE3(set_mempolicy, int, mode, const unsigned long __user *, nmask, |
Heiko Carstens | 938bb9f | 2009-01-14 14:14:30 +0100 | [diff] [blame] | 1351 | unsigned long, maxnode) |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1352 | { |
| 1353 | int err; |
| 1354 | nodemask_t nodes; |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 1355 | unsigned short flags; |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1356 | |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 1357 | flags = mode & MPOL_MODE_FLAGS; |
| 1358 | mode &= ~MPOL_MODE_FLAGS; |
| 1359 | if ((unsigned int)mode >= MPOL_MAX) |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1360 | return -EINVAL; |
David Rientjes | 4c50bc0 | 2008-04-28 02:12:30 -0700 | [diff] [blame] | 1361 | if ((flags & MPOL_F_STATIC_NODES) && (flags & MPOL_F_RELATIVE_NODES)) |
| 1362 | return -EINVAL; |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1363 | err = get_nodes(&nodes, nmask, maxnode); |
| 1364 | if (err) |
| 1365 | return err; |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 1366 | return do_set_mempolicy(mode, flags, &nodes); |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1367 | } |
| 1368 | |
Heiko Carstens | 938bb9f | 2009-01-14 14:14:30 +0100 | [diff] [blame] | 1369 | SYSCALL_DEFINE4(migrate_pages, pid_t, pid, unsigned long, maxnode, |
| 1370 | const unsigned long __user *, old_nodes, |
| 1371 | const unsigned long __user *, new_nodes) |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1372 | { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1373 | const struct cred *cred = current_cred(), *tcred; |
KOSAKI Motohiro | 596d7cf | 2010-08-09 17:19:01 -0700 | [diff] [blame] | 1374 | struct mm_struct *mm = NULL; |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1375 | struct task_struct *task; |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1376 | nodemask_t task_nodes; |
| 1377 | int err; |
KOSAKI Motohiro | 596d7cf | 2010-08-09 17:19:01 -0700 | [diff] [blame] | 1378 | nodemask_t *old; |
| 1379 | nodemask_t *new; |
| 1380 | NODEMASK_SCRATCH(scratch); |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1381 | |
KOSAKI Motohiro | 596d7cf | 2010-08-09 17:19:01 -0700 | [diff] [blame] | 1382 | if (!scratch) |
| 1383 | return -ENOMEM; |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1384 | |
KOSAKI Motohiro | 596d7cf | 2010-08-09 17:19:01 -0700 | [diff] [blame] | 1385 | old = &scratch->mask1; |
| 1386 | new = &scratch->mask2; |
| 1387 | |
| 1388 | err = get_nodes(old, old_nodes, maxnode); |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1389 | if (err) |
KOSAKI Motohiro | 596d7cf | 2010-08-09 17:19:01 -0700 | [diff] [blame] | 1390 | goto out; |
| 1391 | |
| 1392 | err = get_nodes(new, new_nodes, maxnode); |
| 1393 | if (err) |
| 1394 | goto out; |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1395 | |
| 1396 | /* Find the mm_struct */ |
Zeng Zhaoming | 55cfaa3 | 2010-12-02 14:31:13 -0800 | [diff] [blame] | 1397 | rcu_read_lock(); |
Pavel Emelyanov | 228ebcb | 2007-10-18 23:40:16 -0700 | [diff] [blame] | 1398 | task = pid ? find_task_by_vpid(pid) : current; |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1399 | if (!task) { |
Zeng Zhaoming | 55cfaa3 | 2010-12-02 14:31:13 -0800 | [diff] [blame] | 1400 | rcu_read_unlock(); |
KOSAKI Motohiro | 596d7cf | 2010-08-09 17:19:01 -0700 | [diff] [blame] | 1401 | err = -ESRCH; |
| 1402 | goto out; |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1403 | } |
Christoph Lameter | 3268c63 | 2012-03-21 16:34:06 -0700 | [diff] [blame] | 1404 | get_task_struct(task); |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1405 | |
KOSAKI Motohiro | 596d7cf | 2010-08-09 17:19:01 -0700 | [diff] [blame] | 1406 | err = -EINVAL; |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1407 | |
| 1408 | /* |
| 1409 | * Check if this process has the right to modify the specified |
| 1410 | * process. The right exists if the process has administrative |
Alexey Dobriyan | 7f927fc | 2006-03-28 01:56:53 -0800 | [diff] [blame] | 1411 | * capabilities, superuser privileges or the same |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1412 | * userid as the target process. |
| 1413 | */ |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1414 | tcred = __task_cred(task); |
Eric W. Biederman | b38a86e | 2012-03-12 15:48:24 -0700 | [diff] [blame] | 1415 | if (!uid_eq(cred->euid, tcred->suid) && !uid_eq(cred->euid, tcred->uid) && |
| 1416 | !uid_eq(cred->uid, tcred->suid) && !uid_eq(cred->uid, tcred->uid) && |
Christoph Lameter | 74c0024 | 2006-03-14 19:50:21 -0800 | [diff] [blame] | 1417 | !capable(CAP_SYS_NICE)) { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1418 | rcu_read_unlock(); |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1419 | err = -EPERM; |
Christoph Lameter | 3268c63 | 2012-03-21 16:34:06 -0700 | [diff] [blame] | 1420 | goto out_put; |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1421 | } |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1422 | rcu_read_unlock(); |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1423 | |
| 1424 | task_nodes = cpuset_mems_allowed(task); |
| 1425 | /* Is the user allowed to access the target nodes? */ |
KOSAKI Motohiro | 596d7cf | 2010-08-09 17:19:01 -0700 | [diff] [blame] | 1426 | if (!nodes_subset(*new, task_nodes) && !capable(CAP_SYS_NICE)) { |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1427 | err = -EPERM; |
Christoph Lameter | 3268c63 | 2012-03-21 16:34:06 -0700 | [diff] [blame] | 1428 | goto out_put; |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1429 | } |
| 1430 | |
Lai Jiangshan | 01f13bd | 2012-12-12 13:51:33 -0800 | [diff] [blame] | 1431 | if (!nodes_subset(*new, node_states[N_MEMORY])) { |
Christoph Lameter | 3b42d28 | 2007-08-31 00:12:08 -0700 | [diff] [blame] | 1432 | err = -EINVAL; |
Christoph Lameter | 3268c63 | 2012-03-21 16:34:06 -0700 | [diff] [blame] | 1433 | goto out_put; |
Christoph Lameter | 3b42d28 | 2007-08-31 00:12:08 -0700 | [diff] [blame] | 1434 | } |
| 1435 | |
David Quigley | 86c3a76 | 2006-06-23 02:04:02 -0700 | [diff] [blame] | 1436 | err = security_task_movememory(task); |
| 1437 | if (err) |
Christoph Lameter | 3268c63 | 2012-03-21 16:34:06 -0700 | [diff] [blame] | 1438 | goto out_put; |
David Quigley | 86c3a76 | 2006-06-23 02:04:02 -0700 | [diff] [blame] | 1439 | |
Christoph Lameter | 3268c63 | 2012-03-21 16:34:06 -0700 | [diff] [blame] | 1440 | mm = get_task_mm(task); |
| 1441 | put_task_struct(task); |
Sasha Levin | f2a9ef8 | 2012-04-25 16:01:52 -0700 | [diff] [blame] | 1442 | |
| 1443 | if (!mm) { |
Christoph Lameter | 3268c63 | 2012-03-21 16:34:06 -0700 | [diff] [blame] | 1444 | err = -EINVAL; |
Sasha Levin | f2a9ef8 | 2012-04-25 16:01:52 -0700 | [diff] [blame] | 1445 | goto out; |
| 1446 | } |
| 1447 | |
| 1448 | err = do_migrate_pages(mm, old, new, |
| 1449 | capable(CAP_SYS_NICE) ? MPOL_MF_MOVE_ALL : MPOL_MF_MOVE); |
Christoph Lameter | 3268c63 | 2012-03-21 16:34:06 -0700 | [diff] [blame] | 1450 | |
| 1451 | mmput(mm); |
| 1452 | out: |
KOSAKI Motohiro | 596d7cf | 2010-08-09 17:19:01 -0700 | [diff] [blame] | 1453 | NODEMASK_SCRATCH_FREE(scratch); |
| 1454 | |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1455 | return err; |
Christoph Lameter | 3268c63 | 2012-03-21 16:34:06 -0700 | [diff] [blame] | 1456 | |
| 1457 | out_put: |
| 1458 | put_task_struct(task); |
| 1459 | goto out; |
| 1460 | |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1461 | } |
| 1462 | |
| 1463 | |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1464 | /* Retrieve NUMA policy */ |
Heiko Carstens | 938bb9f | 2009-01-14 14:14:30 +0100 | [diff] [blame] | 1465 | SYSCALL_DEFINE5(get_mempolicy, int __user *, policy, |
| 1466 | unsigned long __user *, nmask, unsigned long, maxnode, |
| 1467 | unsigned long, addr, unsigned long, flags) |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1468 | { |
Adrian Bunk | dbcb0f1 | 2007-10-16 01:26:26 -0700 | [diff] [blame] | 1469 | int err; |
| 1470 | int uninitialized_var(pval); |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1471 | nodemask_t nodes; |
| 1472 | |
| 1473 | if (nmask != NULL && maxnode < MAX_NUMNODES) |
| 1474 | return -EINVAL; |
| 1475 | |
| 1476 | err = do_get_mempolicy(&pval, &nodes, addr, flags); |
| 1477 | |
| 1478 | if (err) |
| 1479 | return err; |
| 1480 | |
| 1481 | if (policy && put_user(pval, policy)) |
| 1482 | return -EFAULT; |
| 1483 | |
| 1484 | if (nmask) |
| 1485 | err = copy_nodes_to_user(nmask, maxnode, &nodes); |
| 1486 | |
| 1487 | return err; |
| 1488 | } |
| 1489 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1490 | #ifdef CONFIG_COMPAT |
| 1491 | |
Heiko Carstens | c93e0f6 | 2014-03-03 16:32:26 +0100 | [diff] [blame] | 1492 | COMPAT_SYSCALL_DEFINE5(get_mempolicy, int __user *, policy, |
| 1493 | compat_ulong_t __user *, nmask, |
| 1494 | compat_ulong_t, maxnode, |
| 1495 | compat_ulong_t, addr, compat_ulong_t, flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1496 | { |
| 1497 | long err; |
| 1498 | unsigned long __user *nm = NULL; |
| 1499 | unsigned long nr_bits, alloc_size; |
| 1500 | DECLARE_BITMAP(bm, MAX_NUMNODES); |
| 1501 | |
| 1502 | nr_bits = min_t(unsigned long, maxnode-1, MAX_NUMNODES); |
| 1503 | alloc_size = ALIGN(nr_bits, BITS_PER_LONG) / 8; |
| 1504 | |
| 1505 | if (nmask) |
| 1506 | nm = compat_alloc_user_space(alloc_size); |
| 1507 | |
| 1508 | err = sys_get_mempolicy(policy, nm, nr_bits+1, addr, flags); |
| 1509 | |
| 1510 | if (!err && nmask) { |
KAMEZAWA Hiroyuki | 2bbff6c | 2011-09-14 16:21:02 -0700 | [diff] [blame] | 1511 | unsigned long copy_size; |
| 1512 | copy_size = min_t(unsigned long, sizeof(bm), alloc_size); |
| 1513 | err = copy_from_user(bm, nm, copy_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1514 | /* ensure entire bitmap is zeroed */ |
| 1515 | err |= clear_user(nmask, ALIGN(maxnode-1, 8) / 8); |
| 1516 | err |= compat_put_bitmap(nmask, bm, nr_bits); |
| 1517 | } |
| 1518 | |
| 1519 | return err; |
| 1520 | } |
| 1521 | |
Heiko Carstens | c93e0f6 | 2014-03-03 16:32:26 +0100 | [diff] [blame] | 1522 | COMPAT_SYSCALL_DEFINE3(set_mempolicy, int, mode, compat_ulong_t __user *, nmask, |
| 1523 | compat_ulong_t, maxnode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1524 | { |
| 1525 | long err = 0; |
| 1526 | unsigned long __user *nm = NULL; |
| 1527 | unsigned long nr_bits, alloc_size; |
| 1528 | DECLARE_BITMAP(bm, MAX_NUMNODES); |
| 1529 | |
| 1530 | nr_bits = min_t(unsigned long, maxnode-1, MAX_NUMNODES); |
| 1531 | alloc_size = ALIGN(nr_bits, BITS_PER_LONG) / 8; |
| 1532 | |
| 1533 | if (nmask) { |
| 1534 | err = compat_get_bitmap(bm, nmask, nr_bits); |
| 1535 | nm = compat_alloc_user_space(alloc_size); |
| 1536 | err |= copy_to_user(nm, bm, alloc_size); |
| 1537 | } |
| 1538 | |
| 1539 | if (err) |
| 1540 | return -EFAULT; |
| 1541 | |
| 1542 | return sys_set_mempolicy(mode, nm, nr_bits+1); |
| 1543 | } |
| 1544 | |
Heiko Carstens | c93e0f6 | 2014-03-03 16:32:26 +0100 | [diff] [blame] | 1545 | COMPAT_SYSCALL_DEFINE6(mbind, compat_ulong_t, start, compat_ulong_t, len, |
| 1546 | compat_ulong_t, mode, compat_ulong_t __user *, nmask, |
| 1547 | compat_ulong_t, maxnode, compat_ulong_t, flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1548 | { |
| 1549 | long err = 0; |
| 1550 | unsigned long __user *nm = NULL; |
| 1551 | unsigned long nr_bits, alloc_size; |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 1552 | nodemask_t bm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1553 | |
| 1554 | nr_bits = min_t(unsigned long, maxnode-1, MAX_NUMNODES); |
| 1555 | alloc_size = ALIGN(nr_bits, BITS_PER_LONG) / 8; |
| 1556 | |
| 1557 | if (nmask) { |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 1558 | err = compat_get_bitmap(nodes_addr(bm), nmask, nr_bits); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1559 | nm = compat_alloc_user_space(alloc_size); |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 1560 | err |= copy_to_user(nm, nodes_addr(bm), alloc_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1561 | } |
| 1562 | |
| 1563 | if (err) |
| 1564 | return -EFAULT; |
| 1565 | |
| 1566 | return sys_mbind(start, len, mode, nm, nr_bits+1, flags); |
| 1567 | } |
| 1568 | |
| 1569 | #endif |
| 1570 | |
Oleg Nesterov | 74d2c3a | 2014-10-09 15:27:50 -0700 | [diff] [blame] | 1571 | struct mempolicy *__get_vma_policy(struct vm_area_struct *vma, |
| 1572 | unsigned long addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1573 | { |
Oleg Nesterov | 8d90274 | 2014-10-09 15:27:45 -0700 | [diff] [blame] | 1574 | struct mempolicy *pol = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1575 | |
| 1576 | if (vma) { |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1577 | if (vma->vm_ops && vma->vm_ops->get_policy) { |
Oleg Nesterov | 8d90274 | 2014-10-09 15:27:45 -0700 | [diff] [blame] | 1578 | pol = vma->vm_ops->get_policy(vma, addr); |
Mel Gorman | 00442ad | 2012-10-08 16:29:20 -0700 | [diff] [blame] | 1579 | } else if (vma->vm_policy) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1580 | pol = vma->vm_policy; |
Mel Gorman | 00442ad | 2012-10-08 16:29:20 -0700 | [diff] [blame] | 1581 | |
| 1582 | /* |
| 1583 | * shmem_alloc_page() passes MPOL_F_SHARED policy with |
| 1584 | * a pseudo vma whose vma->vm_ops=NULL. Take a reference |
| 1585 | * count on these policies which will be dropped by |
| 1586 | * mpol_cond_put() later |
| 1587 | */ |
| 1588 | if (mpol_needs_cond_ref(pol)) |
| 1589 | mpol_get(pol); |
| 1590 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1591 | } |
Oleg Nesterov | f15ca78 | 2014-10-09 15:27:43 -0700 | [diff] [blame] | 1592 | |
Oleg Nesterov | 74d2c3a | 2014-10-09 15:27:50 -0700 | [diff] [blame] | 1593 | return pol; |
| 1594 | } |
| 1595 | |
| 1596 | /* |
Oleg Nesterov | dd6eecb | 2014-10-09 15:27:57 -0700 | [diff] [blame] | 1597 | * get_vma_policy(@vma, @addr) |
Oleg Nesterov | 74d2c3a | 2014-10-09 15:27:50 -0700 | [diff] [blame] | 1598 | * @vma: virtual memory area whose policy is sought |
| 1599 | * @addr: address in @vma for shared policy lookup |
| 1600 | * |
| 1601 | * Returns effective policy for a VMA at specified address. |
Oleg Nesterov | dd6eecb | 2014-10-09 15:27:57 -0700 | [diff] [blame] | 1602 | * Falls back to current->mempolicy or system default policy, as necessary. |
Oleg Nesterov | 74d2c3a | 2014-10-09 15:27:50 -0700 | [diff] [blame] | 1603 | * Shared policies [those marked as MPOL_F_SHARED] require an extra reference |
| 1604 | * count--added by the get_policy() vm_op, as appropriate--to protect against |
| 1605 | * freeing by another task. It is the caller's responsibility to free the |
| 1606 | * extra reference for shared policies. |
| 1607 | */ |
Oleg Nesterov | dd6eecb | 2014-10-09 15:27:57 -0700 | [diff] [blame] | 1608 | static struct mempolicy *get_vma_policy(struct vm_area_struct *vma, |
| 1609 | unsigned long addr) |
Oleg Nesterov | 74d2c3a | 2014-10-09 15:27:50 -0700 | [diff] [blame] | 1610 | { |
| 1611 | struct mempolicy *pol = __get_vma_policy(vma, addr); |
| 1612 | |
Oleg Nesterov | 8d90274 | 2014-10-09 15:27:45 -0700 | [diff] [blame] | 1613 | if (!pol) |
Oleg Nesterov | dd6eecb | 2014-10-09 15:27:57 -0700 | [diff] [blame] | 1614 | pol = get_task_policy(current); |
Oleg Nesterov | 8d90274 | 2014-10-09 15:27:45 -0700 | [diff] [blame] | 1615 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1616 | return pol; |
| 1617 | } |
| 1618 | |
Oleg Nesterov | 6b6482b | 2014-10-09 15:27:48 -0700 | [diff] [blame] | 1619 | bool vma_policy_mof(struct vm_area_struct *vma) |
Mel Gorman | fc314724 | 2013-10-07 11:29:09 +0100 | [diff] [blame] | 1620 | { |
Oleg Nesterov | 6b6482b | 2014-10-09 15:27:48 -0700 | [diff] [blame] | 1621 | struct mempolicy *pol; |
Oleg Nesterov | f15ca78 | 2014-10-09 15:27:43 -0700 | [diff] [blame] | 1622 | |
Oleg Nesterov | 6b6482b | 2014-10-09 15:27:48 -0700 | [diff] [blame] | 1623 | if (vma->vm_ops && vma->vm_ops->get_policy) { |
| 1624 | bool ret = false; |
Mel Gorman | fc314724 | 2013-10-07 11:29:09 +0100 | [diff] [blame] | 1625 | |
Oleg Nesterov | 6b6482b | 2014-10-09 15:27:48 -0700 | [diff] [blame] | 1626 | pol = vma->vm_ops->get_policy(vma, vma->vm_start); |
| 1627 | if (pol && (pol->flags & MPOL_F_MOF)) |
| 1628 | ret = true; |
| 1629 | mpol_cond_put(pol); |
Mel Gorman | fc314724 | 2013-10-07 11:29:09 +0100 | [diff] [blame] | 1630 | |
Oleg Nesterov | 6b6482b | 2014-10-09 15:27:48 -0700 | [diff] [blame] | 1631 | return ret; |
Mel Gorman | fc314724 | 2013-10-07 11:29:09 +0100 | [diff] [blame] | 1632 | } |
| 1633 | |
Oleg Nesterov | 6b6482b | 2014-10-09 15:27:48 -0700 | [diff] [blame] | 1634 | pol = vma->vm_policy; |
Oleg Nesterov | 8d90274 | 2014-10-09 15:27:45 -0700 | [diff] [blame] | 1635 | if (!pol) |
Oleg Nesterov | 6b6482b | 2014-10-09 15:27:48 -0700 | [diff] [blame] | 1636 | pol = get_task_policy(current); |
Oleg Nesterov | 8d90274 | 2014-10-09 15:27:45 -0700 | [diff] [blame] | 1637 | |
Mel Gorman | fc314724 | 2013-10-07 11:29:09 +0100 | [diff] [blame] | 1638 | return pol->flags & MPOL_F_MOF; |
| 1639 | } |
| 1640 | |
Lai Jiangshan | d3eb157 | 2013-02-22 16:33:22 -0800 | [diff] [blame] | 1641 | static int apply_policy_zone(struct mempolicy *policy, enum zone_type zone) |
| 1642 | { |
| 1643 | enum zone_type dynamic_policy_zone = policy_zone; |
| 1644 | |
| 1645 | BUG_ON(dynamic_policy_zone == ZONE_MOVABLE); |
| 1646 | |
| 1647 | /* |
| 1648 | * if policy->v.nodes has movable memory only, |
| 1649 | * we apply policy when gfp_zone(gfp) = ZONE_MOVABLE only. |
| 1650 | * |
| 1651 | * policy->v.nodes is intersect with node_states[N_MEMORY]. |
| 1652 | * so if the following test faile, it implies |
| 1653 | * policy->v.nodes has movable memory only. |
| 1654 | */ |
| 1655 | if (!nodes_intersects(policy->v.nodes, node_states[N_HIGH_MEMORY])) |
| 1656 | dynamic_policy_zone = ZONE_MOVABLE; |
| 1657 | |
| 1658 | return zone >= dynamic_policy_zone; |
| 1659 | } |
| 1660 | |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1661 | /* |
| 1662 | * Return a nodemask representing a mempolicy for filtering nodes for |
| 1663 | * page allocation |
| 1664 | */ |
| 1665 | static nodemask_t *policy_nodemask(gfp_t gfp, struct mempolicy *policy) |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1666 | { |
| 1667 | /* Lower zones don't get a nodemask applied for MPOL_BIND */ |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 1668 | if (unlikely(policy->mode == MPOL_BIND) && |
Lai Jiangshan | d3eb157 | 2013-02-22 16:33:22 -0800 | [diff] [blame] | 1669 | apply_policy_zone(policy, gfp_zone(gfp)) && |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1670 | cpuset_nodemask_valid_mems_allowed(&policy->v.nodes)) |
| 1671 | return &policy->v.nodes; |
| 1672 | |
| 1673 | return NULL; |
| 1674 | } |
| 1675 | |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1676 | /* Return a zonelist indicated by gfp for node representing a mempolicy */ |
Andi Kleen | 2f5f948 | 2011-03-04 17:36:29 -0800 | [diff] [blame] | 1677 | static struct zonelist *policy_zonelist(gfp_t gfp, struct mempolicy *policy, |
| 1678 | int nd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1679 | { |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 1680 | switch (policy->mode) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1681 | case MPOL_PREFERRED: |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 1682 | if (!(policy->flags & MPOL_F_LOCAL)) |
| 1683 | nd = policy->v.preferred_node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1684 | break; |
| 1685 | case MPOL_BIND: |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1686 | /* |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1687 | * Normally, MPOL_BIND allocations are node-local within the |
| 1688 | * allowed nodemask. However, if __GFP_THISNODE is set and the |
Bob Liu | 6eb27e1 | 2010-05-24 14:32:00 -0700 | [diff] [blame] | 1689 | * current node isn't part of the mask, we use the zonelist for |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1690 | * the first node in the mask instead. |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1691 | */ |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1692 | if (unlikely(gfp & __GFP_THISNODE) && |
| 1693 | unlikely(!node_isset(nd, policy->v.nodes))) |
| 1694 | nd = first_node(policy->v.nodes); |
| 1695 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1696 | default: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1697 | BUG(); |
| 1698 | } |
Mel Gorman | 0e88460 | 2008-04-28 02:12:14 -0700 | [diff] [blame] | 1699 | return node_zonelist(nd, gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1700 | } |
| 1701 | |
| 1702 | /* Do dynamic interleaving for a process */ |
| 1703 | static unsigned interleave_nodes(struct mempolicy *policy) |
| 1704 | { |
| 1705 | unsigned nid, next; |
| 1706 | struct task_struct *me = current; |
| 1707 | |
| 1708 | nid = me->il_next; |
Andrew Morton | 0edaf86 | 2016-05-19 17:10:58 -0700 | [diff] [blame] | 1709 | next = next_node_in(nid, policy->v.nodes); |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 1710 | if (next < MAX_NUMNODES) |
| 1711 | me->il_next = next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1712 | return nid; |
| 1713 | } |
| 1714 | |
Christoph Lameter | dc85da1 | 2006-01-18 17:42:36 -0800 | [diff] [blame] | 1715 | /* |
| 1716 | * Depending on the memory policy provide a node from which to allocate the |
| 1717 | * next slab entry. |
| 1718 | */ |
David Rientjes | 2a38961 | 2014-04-07 15:37:29 -0700 | [diff] [blame] | 1719 | unsigned int mempolicy_slab_node(void) |
Christoph Lameter | dc85da1 | 2006-01-18 17:42:36 -0800 | [diff] [blame] | 1720 | { |
Andi Kleen | e7b691b | 2012-06-09 02:40:03 -0700 | [diff] [blame] | 1721 | struct mempolicy *policy; |
David Rientjes | 2a38961 | 2014-04-07 15:37:29 -0700 | [diff] [blame] | 1722 | int node = numa_mem_id(); |
Andi Kleen | e7b691b | 2012-06-09 02:40:03 -0700 | [diff] [blame] | 1723 | |
| 1724 | if (in_interrupt()) |
David Rientjes | 2a38961 | 2014-04-07 15:37:29 -0700 | [diff] [blame] | 1725 | return node; |
Andi Kleen | e7b691b | 2012-06-09 02:40:03 -0700 | [diff] [blame] | 1726 | |
| 1727 | policy = current->mempolicy; |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 1728 | if (!policy || policy->flags & MPOL_F_LOCAL) |
David Rientjes | 2a38961 | 2014-04-07 15:37:29 -0700 | [diff] [blame] | 1729 | return node; |
Christoph Lameter | 765c450 | 2006-09-27 01:50:08 -0700 | [diff] [blame] | 1730 | |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 1731 | switch (policy->mode) { |
| 1732 | case MPOL_PREFERRED: |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 1733 | /* |
| 1734 | * handled MPOL_F_LOCAL above |
| 1735 | */ |
| 1736 | return policy->v.preferred_node; |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 1737 | |
Christoph Lameter | dc85da1 | 2006-01-18 17:42:36 -0800 | [diff] [blame] | 1738 | case MPOL_INTERLEAVE: |
| 1739 | return interleave_nodes(policy); |
| 1740 | |
Mel Gorman | dd1a239 | 2008-04-28 02:12:17 -0700 | [diff] [blame] | 1741 | case MPOL_BIND: { |
Mel Gorman | c33d6c0 | 2016-05-19 17:14:10 -0700 | [diff] [blame] | 1742 | struct zoneref *z; |
| 1743 | |
Christoph Lameter | dc85da1 | 2006-01-18 17:42:36 -0800 | [diff] [blame] | 1744 | /* |
| 1745 | * Follow bind policy behavior and start allocation at the |
| 1746 | * first node. |
| 1747 | */ |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1748 | struct zonelist *zonelist; |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1749 | enum zone_type highest_zoneidx = gfp_zone(GFP_KERNEL); |
David Rientjes | 2a38961 | 2014-04-07 15:37:29 -0700 | [diff] [blame] | 1750 | zonelist = &NODE_DATA(node)->node_zonelists[0]; |
Mel Gorman | c33d6c0 | 2016-05-19 17:14:10 -0700 | [diff] [blame] | 1751 | z = first_zones_zonelist(zonelist, highest_zoneidx, |
| 1752 | &policy->v.nodes); |
| 1753 | return z->zone ? z->zone->node : node; |
Mel Gorman | dd1a239 | 2008-04-28 02:12:17 -0700 | [diff] [blame] | 1754 | } |
Christoph Lameter | dc85da1 | 2006-01-18 17:42:36 -0800 | [diff] [blame] | 1755 | |
Christoph Lameter | dc85da1 | 2006-01-18 17:42:36 -0800 | [diff] [blame] | 1756 | default: |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 1757 | BUG(); |
Christoph Lameter | dc85da1 | 2006-01-18 17:42:36 -0800 | [diff] [blame] | 1758 | } |
| 1759 | } |
| 1760 | |
Andrew Morton | fee83b3 | 2016-05-19 17:11:43 -0700 | [diff] [blame] | 1761 | /* |
| 1762 | * Do static interleaving for a VMA with known offset @n. Returns the n'th |
| 1763 | * node in pol->v.nodes (starting from n=0), wrapping around if n exceeds the |
| 1764 | * number of present nodes. |
| 1765 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1766 | static unsigned offset_il_node(struct mempolicy *pol, |
Andrew Morton | fee83b3 | 2016-05-19 17:11:43 -0700 | [diff] [blame] | 1767 | struct vm_area_struct *vma, unsigned long n) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1768 | { |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 1769 | unsigned nnodes = nodes_weight(pol->v.nodes); |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 1770 | unsigned target; |
Andrew Morton | fee83b3 | 2016-05-19 17:11:43 -0700 | [diff] [blame] | 1771 | int i; |
| 1772 | int nid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1773 | |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 1774 | if (!nnodes) |
| 1775 | return numa_node_id(); |
Andrew Morton | fee83b3 | 2016-05-19 17:11:43 -0700 | [diff] [blame] | 1776 | target = (unsigned int)n % nnodes; |
| 1777 | nid = first_node(pol->v.nodes); |
| 1778 | for (i = 0; i < target; i++) |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 1779 | nid = next_node(nid, pol->v.nodes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1780 | return nid; |
| 1781 | } |
| 1782 | |
Christoph Lameter | 5da7ca8 | 2006-01-06 00:10:46 -0800 | [diff] [blame] | 1783 | /* Determine a node number for interleave */ |
| 1784 | static inline unsigned interleave_nid(struct mempolicy *pol, |
| 1785 | struct vm_area_struct *vma, unsigned long addr, int shift) |
| 1786 | { |
| 1787 | if (vma) { |
| 1788 | unsigned long off; |
| 1789 | |
Nishanth Aravamudan | 3b98b08 | 2006-08-31 21:27:53 -0700 | [diff] [blame] | 1790 | /* |
| 1791 | * for small pages, there is no difference between |
| 1792 | * shift and PAGE_SHIFT, so the bit-shift is safe. |
| 1793 | * for huge pages, since vm_pgoff is in units of small |
| 1794 | * pages, we need to shift off the always 0 bits to get |
| 1795 | * a useful offset. |
| 1796 | */ |
| 1797 | BUG_ON(shift < PAGE_SHIFT); |
| 1798 | off = vma->vm_pgoff >> (shift - PAGE_SHIFT); |
Christoph Lameter | 5da7ca8 | 2006-01-06 00:10:46 -0800 | [diff] [blame] | 1799 | off += (addr - vma->vm_start) >> shift; |
| 1800 | return offset_il_node(pol, vma, off); |
| 1801 | } else |
| 1802 | return interleave_nodes(pol); |
| 1803 | } |
| 1804 | |
Chen, Kenneth W | 00ac59a | 2006-02-03 21:51:14 +0100 | [diff] [blame] | 1805 | #ifdef CONFIG_HUGETLBFS |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1806 | /* |
| 1807 | * huge_zonelist(@vma, @addr, @gfp_flags, @mpol) |
Fabian Frederick | b46e14a | 2014-06-04 16:08:18 -0700 | [diff] [blame] | 1808 | * @vma: virtual memory area whose policy is sought |
| 1809 | * @addr: address in @vma for shared policy lookup and interleave policy |
| 1810 | * @gfp_flags: for requested zone |
| 1811 | * @mpol: pointer to mempolicy pointer for reference counted mempolicy |
| 1812 | * @nodemask: pointer to nodemask pointer for MPOL_BIND nodemask |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1813 | * |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1814 | * Returns a zonelist suitable for a huge page allocation and a pointer |
| 1815 | * to the struct mempolicy for conditional unref after allocation. |
| 1816 | * If the effective policy is 'BIND, returns a pointer to the mempolicy's |
| 1817 | * @nodemask for filtering the zonelist. |
Miao Xie | c0ff745 | 2010-05-24 14:32:08 -0700 | [diff] [blame] | 1818 | * |
Mel Gorman | d26914d | 2014-04-03 14:47:24 -0700 | [diff] [blame] | 1819 | * Must be protected by read_mems_allowed_begin() |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1820 | */ |
Mel Gorman | 396faf0 | 2007-07-17 04:03:13 -0700 | [diff] [blame] | 1821 | struct zonelist *huge_zonelist(struct vm_area_struct *vma, unsigned long addr, |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1822 | gfp_t gfp_flags, struct mempolicy **mpol, |
| 1823 | nodemask_t **nodemask) |
Christoph Lameter | 5da7ca8 | 2006-01-06 00:10:46 -0800 | [diff] [blame] | 1824 | { |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1825 | struct zonelist *zl; |
Christoph Lameter | 5da7ca8 | 2006-01-06 00:10:46 -0800 | [diff] [blame] | 1826 | |
Oleg Nesterov | dd6eecb | 2014-10-09 15:27:57 -0700 | [diff] [blame] | 1827 | *mpol = get_vma_policy(vma, addr); |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1828 | *nodemask = NULL; /* assume !MPOL_BIND */ |
Christoph Lameter | 5da7ca8 | 2006-01-06 00:10:46 -0800 | [diff] [blame] | 1829 | |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1830 | if (unlikely((*mpol)->mode == MPOL_INTERLEAVE)) { |
| 1831 | zl = node_zonelist(interleave_nid(*mpol, vma, addr, |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1832 | huge_page_shift(hstate_vma(vma))), gfp_flags); |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1833 | } else { |
Andi Kleen | 2f5f948 | 2011-03-04 17:36:29 -0800 | [diff] [blame] | 1834 | zl = policy_zonelist(gfp_flags, *mpol, numa_node_id()); |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1835 | if ((*mpol)->mode == MPOL_BIND) |
| 1836 | *nodemask = &(*mpol)->v.nodes; |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1837 | } |
| 1838 | return zl; |
Christoph Lameter | 5da7ca8 | 2006-01-06 00:10:46 -0800 | [diff] [blame] | 1839 | } |
Lee Schermerhorn | 06808b0 | 2009-12-14 17:58:21 -0800 | [diff] [blame] | 1840 | |
| 1841 | /* |
| 1842 | * init_nodemask_of_mempolicy |
| 1843 | * |
| 1844 | * If the current task's mempolicy is "default" [NULL], return 'false' |
| 1845 | * to indicate default policy. Otherwise, extract the policy nodemask |
| 1846 | * for 'bind' or 'interleave' policy into the argument nodemask, or |
| 1847 | * initialize the argument nodemask to contain the single node for |
| 1848 | * 'preferred' or 'local' policy and return 'true' to indicate presence |
| 1849 | * of non-default mempolicy. |
| 1850 | * |
| 1851 | * We don't bother with reference counting the mempolicy [mpol_get/put] |
| 1852 | * because the current task is examining it's own mempolicy and a task's |
| 1853 | * mempolicy is only ever changed by the task itself. |
| 1854 | * |
| 1855 | * N.B., it is the caller's responsibility to free a returned nodemask. |
| 1856 | */ |
| 1857 | bool init_nodemask_of_mempolicy(nodemask_t *mask) |
| 1858 | { |
| 1859 | struct mempolicy *mempolicy; |
| 1860 | int nid; |
| 1861 | |
| 1862 | if (!(mask && current->mempolicy)) |
| 1863 | return false; |
| 1864 | |
Miao Xie | c0ff745 | 2010-05-24 14:32:08 -0700 | [diff] [blame] | 1865 | task_lock(current); |
Lee Schermerhorn | 06808b0 | 2009-12-14 17:58:21 -0800 | [diff] [blame] | 1866 | mempolicy = current->mempolicy; |
| 1867 | switch (mempolicy->mode) { |
| 1868 | case MPOL_PREFERRED: |
| 1869 | if (mempolicy->flags & MPOL_F_LOCAL) |
| 1870 | nid = numa_node_id(); |
| 1871 | else |
| 1872 | nid = mempolicy->v.preferred_node; |
| 1873 | init_nodemask_of_node(mask, nid); |
| 1874 | break; |
| 1875 | |
| 1876 | case MPOL_BIND: |
| 1877 | /* Fall through */ |
| 1878 | case MPOL_INTERLEAVE: |
| 1879 | *mask = mempolicy->v.nodes; |
| 1880 | break; |
| 1881 | |
| 1882 | default: |
| 1883 | BUG(); |
| 1884 | } |
Miao Xie | c0ff745 | 2010-05-24 14:32:08 -0700 | [diff] [blame] | 1885 | task_unlock(current); |
Lee Schermerhorn | 06808b0 | 2009-12-14 17:58:21 -0800 | [diff] [blame] | 1886 | |
| 1887 | return true; |
| 1888 | } |
Chen, Kenneth W | 00ac59a | 2006-02-03 21:51:14 +0100 | [diff] [blame] | 1889 | #endif |
Christoph Lameter | 5da7ca8 | 2006-01-06 00:10:46 -0800 | [diff] [blame] | 1890 | |
David Rientjes | 6f48d0eb | 2010-08-09 17:18:52 -0700 | [diff] [blame] | 1891 | /* |
| 1892 | * mempolicy_nodemask_intersects |
| 1893 | * |
| 1894 | * If tsk's mempolicy is "default" [NULL], return 'true' to indicate default |
| 1895 | * policy. Otherwise, check for intersection between mask and the policy |
| 1896 | * nodemask for 'bind' or 'interleave' policy. For 'perferred' or 'local' |
| 1897 | * policy, always return true since it may allocate elsewhere on fallback. |
| 1898 | * |
| 1899 | * Takes task_lock(tsk) to prevent freeing of its mempolicy. |
| 1900 | */ |
| 1901 | bool mempolicy_nodemask_intersects(struct task_struct *tsk, |
| 1902 | const nodemask_t *mask) |
| 1903 | { |
| 1904 | struct mempolicy *mempolicy; |
| 1905 | bool ret = true; |
| 1906 | |
| 1907 | if (!mask) |
| 1908 | return ret; |
| 1909 | task_lock(tsk); |
| 1910 | mempolicy = tsk->mempolicy; |
| 1911 | if (!mempolicy) |
| 1912 | goto out; |
| 1913 | |
| 1914 | switch (mempolicy->mode) { |
| 1915 | case MPOL_PREFERRED: |
| 1916 | /* |
| 1917 | * MPOL_PREFERRED and MPOL_F_LOCAL are only preferred nodes to |
| 1918 | * allocate from, they may fallback to other nodes when oom. |
| 1919 | * Thus, it's possible for tsk to have allocated memory from |
| 1920 | * nodes in mask. |
| 1921 | */ |
| 1922 | break; |
| 1923 | case MPOL_BIND: |
| 1924 | case MPOL_INTERLEAVE: |
| 1925 | ret = nodes_intersects(mempolicy->v.nodes, *mask); |
| 1926 | break; |
| 1927 | default: |
| 1928 | BUG(); |
| 1929 | } |
| 1930 | out: |
| 1931 | task_unlock(tsk); |
| 1932 | return ret; |
| 1933 | } |
| 1934 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1935 | /* Allocate a page in interleaved policy. |
| 1936 | Own path because it needs to do special accounting. */ |
Andi Kleen | 662f3a0 | 2005-10-29 18:15:49 -0700 | [diff] [blame] | 1937 | static struct page *alloc_page_interleave(gfp_t gfp, unsigned order, |
| 1938 | unsigned nid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1939 | { |
| 1940 | struct zonelist *zl; |
| 1941 | struct page *page; |
| 1942 | |
Mel Gorman | 0e88460 | 2008-04-28 02:12:14 -0700 | [diff] [blame] | 1943 | zl = node_zonelist(nid, gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1944 | page = __alloc_pages(gfp, order, zl); |
Mel Gorman | dd1a239 | 2008-04-28 02:12:17 -0700 | [diff] [blame] | 1945 | if (page && page_zone(page) == zonelist_zone(&zl->_zonerefs[0])) |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 1946 | inc_zone_page_state(page, NUMA_INTERLEAVE_HIT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1947 | return page; |
| 1948 | } |
| 1949 | |
| 1950 | /** |
Andrea Arcangeli | 0bbbc0b | 2011-01-13 15:47:05 -0800 | [diff] [blame] | 1951 | * alloc_pages_vma - Allocate a page for a VMA. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1952 | * |
| 1953 | * @gfp: |
| 1954 | * %GFP_USER user allocation. |
| 1955 | * %GFP_KERNEL kernel allocations, |
| 1956 | * %GFP_HIGHMEM highmem/user allocations, |
| 1957 | * %GFP_FS allocation should not call back into a file system. |
| 1958 | * %GFP_ATOMIC don't sleep. |
| 1959 | * |
Andrea Arcangeli | 0bbbc0b | 2011-01-13 15:47:05 -0800 | [diff] [blame] | 1960 | * @order:Order of the GFP allocation. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1961 | * @vma: Pointer to VMA or NULL if not available. |
| 1962 | * @addr: Virtual Address of the allocation. Must be inside the VMA. |
Vlastimil Babka | be97a41 | 2015-02-11 15:27:15 -0800 | [diff] [blame] | 1963 | * @node: Which node to prefer for allocation (modulo policy). |
| 1964 | * @hugepage: for hugepages try only the preferred node if possible |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1965 | * |
| 1966 | * This function allocates a page from the kernel page pool and applies |
| 1967 | * a NUMA policy associated with the VMA or the current process. |
| 1968 | * When VMA is not NULL caller must hold down_read on the mmap_sem of the |
| 1969 | * mm_struct of the VMA to prevent it from going away. Should be used for |
Vlastimil Babka | be97a41 | 2015-02-11 15:27:15 -0800 | [diff] [blame] | 1970 | * all allocations for pages that will be mapped into user space. Returns |
| 1971 | * NULL when no page can be allocated. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1972 | */ |
| 1973 | struct page * |
Andrea Arcangeli | 0bbbc0b | 2011-01-13 15:47:05 -0800 | [diff] [blame] | 1974 | alloc_pages_vma(gfp_t gfp, int order, struct vm_area_struct *vma, |
Vlastimil Babka | be97a41 | 2015-02-11 15:27:15 -0800 | [diff] [blame] | 1975 | unsigned long addr, int node, bool hugepage) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1976 | { |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 1977 | struct mempolicy *pol; |
Miao Xie | c0ff745 | 2010-05-24 14:32:08 -0700 | [diff] [blame] | 1978 | struct page *page; |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 1979 | unsigned int cpuset_mems_cookie; |
Vlastimil Babka | be97a41 | 2015-02-11 15:27:15 -0800 | [diff] [blame] | 1980 | struct zonelist *zl; |
| 1981 | nodemask_t *nmask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1982 | |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 1983 | retry_cpuset: |
Oleg Nesterov | dd6eecb | 2014-10-09 15:27:57 -0700 | [diff] [blame] | 1984 | pol = get_vma_policy(vma, addr); |
Mel Gorman | d26914d | 2014-04-03 14:47:24 -0700 | [diff] [blame] | 1985 | cpuset_mems_cookie = read_mems_allowed_begin(); |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 1986 | |
Vlastimil Babka | be97a41 | 2015-02-11 15:27:15 -0800 | [diff] [blame] | 1987 | if (pol->mode == MPOL_INTERLEAVE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1988 | unsigned nid; |
Christoph Lameter | 5da7ca8 | 2006-01-06 00:10:46 -0800 | [diff] [blame] | 1989 | |
Andi Kleen | 8eac563 | 2011-02-25 14:44:28 -0800 | [diff] [blame] | 1990 | nid = interleave_nid(pol, vma, addr, PAGE_SHIFT + order); |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1991 | mpol_cond_put(pol); |
Andrea Arcangeli | 0bbbc0b | 2011-01-13 15:47:05 -0800 | [diff] [blame] | 1992 | page = alloc_page_interleave(gfp, order, nid); |
Vlastimil Babka | be97a41 | 2015-02-11 15:27:15 -0800 | [diff] [blame] | 1993 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1994 | } |
Vlastimil Babka | be97a41 | 2015-02-11 15:27:15 -0800 | [diff] [blame] | 1995 | |
Vlastimil Babka | 0867a57 | 2015-06-24 16:58:48 -0700 | [diff] [blame] | 1996 | if (unlikely(IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) && hugepage)) { |
| 1997 | int hpage_node = node; |
| 1998 | |
| 1999 | /* |
| 2000 | * For hugepage allocation and non-interleave policy which |
| 2001 | * allows the current node (or other explicitly preferred |
| 2002 | * node) we only try to allocate from the current/preferred |
| 2003 | * node and don't fall back to other nodes, as the cost of |
| 2004 | * remote accesses would likely offset THP benefits. |
| 2005 | * |
| 2006 | * If the policy is interleave, or does not allow the current |
| 2007 | * node in its nodemask, we allocate the standard way. |
| 2008 | */ |
| 2009 | if (pol->mode == MPOL_PREFERRED && |
| 2010 | !(pol->flags & MPOL_F_LOCAL)) |
| 2011 | hpage_node = pol->v.preferred_node; |
| 2012 | |
| 2013 | nmask = policy_nodemask(gfp, pol); |
| 2014 | if (!nmask || node_isset(hpage_node, *nmask)) { |
| 2015 | mpol_cond_put(pol); |
Vlastimil Babka | 96db800 | 2015-09-08 15:03:50 -0700 | [diff] [blame] | 2016 | page = __alloc_pages_node(hpage_node, |
Vlastimil Babka | 0867a57 | 2015-06-24 16:58:48 -0700 | [diff] [blame] | 2017 | gfp | __GFP_THISNODE, order); |
| 2018 | goto out; |
| 2019 | } |
| 2020 | } |
| 2021 | |
Vlastimil Babka | be97a41 | 2015-02-11 15:27:15 -0800 | [diff] [blame] | 2022 | nmask = policy_nodemask(gfp, pol); |
| 2023 | zl = policy_zonelist(gfp, pol, node); |
Oleg Nesterov | 2386740 | 2014-10-09 15:27:41 -0700 | [diff] [blame] | 2024 | mpol_cond_put(pol); |
Vlastimil Babka | be97a41 | 2015-02-11 15:27:15 -0800 | [diff] [blame] | 2025 | page = __alloc_pages_nodemask(gfp, order, zl, nmask); |
| 2026 | out: |
Mel Gorman | d26914d | 2014-04-03 14:47:24 -0700 | [diff] [blame] | 2027 | if (unlikely(!page && read_mems_allowed_retry(cpuset_mems_cookie))) |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 2028 | goto retry_cpuset; |
Miao Xie | c0ff745 | 2010-05-24 14:32:08 -0700 | [diff] [blame] | 2029 | return page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2030 | } |
| 2031 | |
| 2032 | /** |
| 2033 | * alloc_pages_current - Allocate pages. |
| 2034 | * |
| 2035 | * @gfp: |
| 2036 | * %GFP_USER user allocation, |
| 2037 | * %GFP_KERNEL kernel allocation, |
| 2038 | * %GFP_HIGHMEM highmem allocation, |
| 2039 | * %GFP_FS don't call back into a file system. |
| 2040 | * %GFP_ATOMIC don't sleep. |
| 2041 | * @order: Power of two of allocation size in pages. 0 is a single page. |
| 2042 | * |
| 2043 | * Allocate a page from the kernel page pool. When not in |
| 2044 | * interrupt context and apply the current process NUMA policy. |
| 2045 | * Returns NULL when no page can be allocated. |
| 2046 | * |
Paul Jackson | cf2a473c | 2006-01-08 01:01:54 -0800 | [diff] [blame] | 2047 | * Don't call cpuset_update_task_memory_state() unless |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2048 | * 1) it's ok to take cpuset_sem (can WAIT), and |
| 2049 | * 2) allocating for current task (not interrupt). |
| 2050 | */ |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 2051 | struct page *alloc_pages_current(gfp_t gfp, unsigned order) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2052 | { |
Oleg Nesterov | 8d90274 | 2014-10-09 15:27:45 -0700 | [diff] [blame] | 2053 | struct mempolicy *pol = &default_policy; |
Miao Xie | c0ff745 | 2010-05-24 14:32:08 -0700 | [diff] [blame] | 2054 | struct page *page; |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 2055 | unsigned int cpuset_mems_cookie; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2056 | |
Oleg Nesterov | 8d90274 | 2014-10-09 15:27:45 -0700 | [diff] [blame] | 2057 | if (!in_interrupt() && !(gfp & __GFP_THISNODE)) |
| 2058 | pol = get_task_policy(current); |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 2059 | |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 2060 | retry_cpuset: |
Mel Gorman | d26914d | 2014-04-03 14:47:24 -0700 | [diff] [blame] | 2061 | cpuset_mems_cookie = read_mems_allowed_begin(); |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 2062 | |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 2063 | /* |
| 2064 | * No reference counting needed for current->mempolicy |
| 2065 | * nor system default_policy |
| 2066 | */ |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 2067 | if (pol->mode == MPOL_INTERLEAVE) |
Miao Xie | c0ff745 | 2010-05-24 14:32:08 -0700 | [diff] [blame] | 2068 | page = alloc_page_interleave(gfp, order, interleave_nodes(pol)); |
| 2069 | else |
| 2070 | page = __alloc_pages_nodemask(gfp, order, |
Andi Kleen | 5c4b4be | 2011-03-04 17:36:32 -0800 | [diff] [blame] | 2071 | policy_zonelist(gfp, pol, numa_node_id()), |
| 2072 | policy_nodemask(gfp, pol)); |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 2073 | |
Mel Gorman | d26914d | 2014-04-03 14:47:24 -0700 | [diff] [blame] | 2074 | if (unlikely(!page && read_mems_allowed_retry(cpuset_mems_cookie))) |
Mel Gorman | cc9a6c8 | 2012-03-21 16:34:11 -0700 | [diff] [blame] | 2075 | goto retry_cpuset; |
| 2076 | |
Miao Xie | c0ff745 | 2010-05-24 14:32:08 -0700 | [diff] [blame] | 2077 | return page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2078 | } |
| 2079 | EXPORT_SYMBOL(alloc_pages_current); |
| 2080 | |
Oleg Nesterov | ef0855d | 2013-09-11 14:20:14 -0700 | [diff] [blame] | 2081 | int vma_dup_policy(struct vm_area_struct *src, struct vm_area_struct *dst) |
| 2082 | { |
| 2083 | struct mempolicy *pol = mpol_dup(vma_policy(src)); |
| 2084 | |
| 2085 | if (IS_ERR(pol)) |
| 2086 | return PTR_ERR(pol); |
| 2087 | dst->vm_policy = pol; |
| 2088 | return 0; |
| 2089 | } |
| 2090 | |
Paul Jackson | 4225399 | 2006-01-08 01:01:59 -0800 | [diff] [blame] | 2091 | /* |
Lee Schermerhorn | 846a16b | 2008-04-28 02:13:09 -0700 | [diff] [blame] | 2092 | * If mpol_dup() sees current->cpuset == cpuset_being_rebound, then it |
Paul Jackson | 4225399 | 2006-01-08 01:01:59 -0800 | [diff] [blame] | 2093 | * rebinds the mempolicy its copying by calling mpol_rebind_policy() |
| 2094 | * with the mems_allowed returned by cpuset_mems_allowed(). This |
| 2095 | * keeps mempolicies cpuset relative after its cpuset moves. See |
| 2096 | * further kernel/cpuset.c update_nodemask(). |
Miao Xie | 708c1bb | 2010-05-24 14:32:07 -0700 | [diff] [blame] | 2097 | * |
| 2098 | * current's mempolicy may be rebinded by the other task(the task that changes |
| 2099 | * cpuset's mems), so we needn't do rebind work for current task. |
Paul Jackson | 4225399 | 2006-01-08 01:01:59 -0800 | [diff] [blame] | 2100 | */ |
Paul Jackson | 4225399 | 2006-01-08 01:01:59 -0800 | [diff] [blame] | 2101 | |
Lee Schermerhorn | 846a16b | 2008-04-28 02:13:09 -0700 | [diff] [blame] | 2102 | /* Slow path of a mempolicy duplicate */ |
| 2103 | struct mempolicy *__mpol_dup(struct mempolicy *old) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2104 | { |
| 2105 | struct mempolicy *new = kmem_cache_alloc(policy_cache, GFP_KERNEL); |
| 2106 | |
| 2107 | if (!new) |
| 2108 | return ERR_PTR(-ENOMEM); |
Miao Xie | 708c1bb | 2010-05-24 14:32:07 -0700 | [diff] [blame] | 2109 | |
| 2110 | /* task's mempolicy is protected by alloc_lock */ |
| 2111 | if (old == current->mempolicy) { |
| 2112 | task_lock(current); |
| 2113 | *new = *old; |
| 2114 | task_unlock(current); |
| 2115 | } else |
| 2116 | *new = *old; |
| 2117 | |
Paul Jackson | 4225399 | 2006-01-08 01:01:59 -0800 | [diff] [blame] | 2118 | if (current_cpuset_is_being_rebound()) { |
| 2119 | nodemask_t mems = cpuset_mems_allowed(current); |
Miao Xie | 708c1bb | 2010-05-24 14:32:07 -0700 | [diff] [blame] | 2120 | if (new->flags & MPOL_F_REBINDING) |
| 2121 | mpol_rebind_policy(new, &mems, MPOL_REBIND_STEP2); |
| 2122 | else |
| 2123 | mpol_rebind_policy(new, &mems, MPOL_REBIND_ONCE); |
Paul Jackson | 4225399 | 2006-01-08 01:01:59 -0800 | [diff] [blame] | 2124 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2125 | atomic_set(&new->refcnt, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2126 | return new; |
| 2127 | } |
| 2128 | |
| 2129 | /* Slow path of a mempolicy comparison */ |
KOSAKI Motohiro | fcfb4dc | 2012-01-10 15:08:21 -0800 | [diff] [blame] | 2130 | bool __mpol_equal(struct mempolicy *a, struct mempolicy *b) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2131 | { |
| 2132 | if (!a || !b) |
KOSAKI Motohiro | fcfb4dc | 2012-01-10 15:08:21 -0800 | [diff] [blame] | 2133 | return false; |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 2134 | if (a->mode != b->mode) |
KOSAKI Motohiro | fcfb4dc | 2012-01-10 15:08:21 -0800 | [diff] [blame] | 2135 | return false; |
Bob Liu | 1980050 | 2010-05-24 14:32:01 -0700 | [diff] [blame] | 2136 | if (a->flags != b->flags) |
KOSAKI Motohiro | fcfb4dc | 2012-01-10 15:08:21 -0800 | [diff] [blame] | 2137 | return false; |
Bob Liu | 1980050 | 2010-05-24 14:32:01 -0700 | [diff] [blame] | 2138 | if (mpol_store_user_nodemask(a)) |
| 2139 | if (!nodes_equal(a->w.user_nodemask, b->w.user_nodemask)) |
KOSAKI Motohiro | fcfb4dc | 2012-01-10 15:08:21 -0800 | [diff] [blame] | 2140 | return false; |
Bob Liu | 1980050 | 2010-05-24 14:32:01 -0700 | [diff] [blame] | 2141 | |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 2142 | switch (a->mode) { |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 2143 | case MPOL_BIND: |
| 2144 | /* Fall through */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2145 | case MPOL_INTERLEAVE: |
KOSAKI Motohiro | fcfb4dc | 2012-01-10 15:08:21 -0800 | [diff] [blame] | 2146 | return !!nodes_equal(a->v.nodes, b->v.nodes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2147 | case MPOL_PREFERRED: |
Namhyung Kim | 7571966 | 2011-03-22 16:33:02 -0700 | [diff] [blame] | 2148 | return a->v.preferred_node == b->v.preferred_node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2149 | default: |
| 2150 | BUG(); |
KOSAKI Motohiro | fcfb4dc | 2012-01-10 15:08:21 -0800 | [diff] [blame] | 2151 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2152 | } |
| 2153 | } |
| 2154 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2155 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2156 | * Shared memory backing store policy support. |
| 2157 | * |
| 2158 | * Remember policies even when nobody has shared memory mapped. |
| 2159 | * The policies are kept in Red-Black tree linked from the inode. |
Nathan Zimmer | 4a8c7bb | 2016-01-14 15:18:36 -0800 | [diff] [blame] | 2160 | * They are protected by the sp->lock rwlock, which should be held |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2161 | * for any accesses to the tree. |
| 2162 | */ |
| 2163 | |
Nathan Zimmer | 4a8c7bb | 2016-01-14 15:18:36 -0800 | [diff] [blame] | 2164 | /* |
| 2165 | * lookup first element intersecting start-end. Caller holds sp->lock for |
| 2166 | * reading or for writing |
| 2167 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2168 | static struct sp_node * |
| 2169 | sp_lookup(struct shared_policy *sp, unsigned long start, unsigned long end) |
| 2170 | { |
| 2171 | struct rb_node *n = sp->root.rb_node; |
| 2172 | |
| 2173 | while (n) { |
| 2174 | struct sp_node *p = rb_entry(n, struct sp_node, nd); |
| 2175 | |
| 2176 | if (start >= p->end) |
| 2177 | n = n->rb_right; |
| 2178 | else if (end <= p->start) |
| 2179 | n = n->rb_left; |
| 2180 | else |
| 2181 | break; |
| 2182 | } |
| 2183 | if (!n) |
| 2184 | return NULL; |
| 2185 | for (;;) { |
| 2186 | struct sp_node *w = NULL; |
| 2187 | struct rb_node *prev = rb_prev(n); |
| 2188 | if (!prev) |
| 2189 | break; |
| 2190 | w = rb_entry(prev, struct sp_node, nd); |
| 2191 | if (w->end <= start) |
| 2192 | break; |
| 2193 | n = prev; |
| 2194 | } |
| 2195 | return rb_entry(n, struct sp_node, nd); |
| 2196 | } |
| 2197 | |
Nathan Zimmer | 4a8c7bb | 2016-01-14 15:18:36 -0800 | [diff] [blame] | 2198 | /* |
| 2199 | * Insert a new shared policy into the list. Caller holds sp->lock for |
| 2200 | * writing. |
| 2201 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2202 | static void sp_insert(struct shared_policy *sp, struct sp_node *new) |
| 2203 | { |
| 2204 | struct rb_node **p = &sp->root.rb_node; |
| 2205 | struct rb_node *parent = NULL; |
| 2206 | struct sp_node *nd; |
| 2207 | |
| 2208 | while (*p) { |
| 2209 | parent = *p; |
| 2210 | nd = rb_entry(parent, struct sp_node, nd); |
| 2211 | if (new->start < nd->start) |
| 2212 | p = &(*p)->rb_left; |
| 2213 | else if (new->end > nd->end) |
| 2214 | p = &(*p)->rb_right; |
| 2215 | else |
| 2216 | BUG(); |
| 2217 | } |
| 2218 | rb_link_node(&new->nd, parent, p); |
| 2219 | rb_insert_color(&new->nd, &sp->root); |
Paul Mundt | 140d5a4 | 2007-07-15 23:38:16 -0700 | [diff] [blame] | 2220 | pr_debug("inserting %lx-%lx: %d\n", new->start, new->end, |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 2221 | new->policy ? new->policy->mode : 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2222 | } |
| 2223 | |
| 2224 | /* Find shared policy intersecting idx */ |
| 2225 | struct mempolicy * |
| 2226 | mpol_shared_policy_lookup(struct shared_policy *sp, unsigned long idx) |
| 2227 | { |
| 2228 | struct mempolicy *pol = NULL; |
| 2229 | struct sp_node *sn; |
| 2230 | |
| 2231 | if (!sp->root.rb_node) |
| 2232 | return NULL; |
Nathan Zimmer | 4a8c7bb | 2016-01-14 15:18:36 -0800 | [diff] [blame] | 2233 | read_lock(&sp->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2234 | sn = sp_lookup(sp, idx, idx+1); |
| 2235 | if (sn) { |
| 2236 | mpol_get(sn->policy); |
| 2237 | pol = sn->policy; |
| 2238 | } |
Nathan Zimmer | 4a8c7bb | 2016-01-14 15:18:36 -0800 | [diff] [blame] | 2239 | read_unlock(&sp->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2240 | return pol; |
| 2241 | } |
| 2242 | |
KOSAKI Motohiro | 63f74ca | 2012-10-08 16:29:19 -0700 | [diff] [blame] | 2243 | static void sp_free(struct sp_node *n) |
| 2244 | { |
| 2245 | mpol_put(n->policy); |
| 2246 | kmem_cache_free(sn_cache, n); |
| 2247 | } |
| 2248 | |
Lee Schermerhorn | 771fb4d | 2012-10-25 14:16:30 +0200 | [diff] [blame] | 2249 | /** |
| 2250 | * mpol_misplaced - check whether current page node is valid in policy |
| 2251 | * |
Fabian Frederick | b46e14a | 2014-06-04 16:08:18 -0700 | [diff] [blame] | 2252 | * @page: page to be checked |
| 2253 | * @vma: vm area where page mapped |
| 2254 | * @addr: virtual address where page mapped |
Lee Schermerhorn | 771fb4d | 2012-10-25 14:16:30 +0200 | [diff] [blame] | 2255 | * |
| 2256 | * Lookup current policy node id for vma,addr and "compare to" page's |
| 2257 | * node id. |
| 2258 | * |
| 2259 | * Returns: |
| 2260 | * -1 - not misplaced, page is in the right node |
| 2261 | * node - node id where the page should be |
| 2262 | * |
| 2263 | * Policy determination "mimics" alloc_page_vma(). |
| 2264 | * Called from fault path where we know the vma and faulting address. |
| 2265 | */ |
| 2266 | int mpol_misplaced(struct page *page, struct vm_area_struct *vma, unsigned long addr) |
| 2267 | { |
| 2268 | struct mempolicy *pol; |
Mel Gorman | c33d6c0 | 2016-05-19 17:14:10 -0700 | [diff] [blame] | 2269 | struct zoneref *z; |
Lee Schermerhorn | 771fb4d | 2012-10-25 14:16:30 +0200 | [diff] [blame] | 2270 | int curnid = page_to_nid(page); |
| 2271 | unsigned long pgoff; |
Peter Zijlstra | 9057289 | 2013-10-07 11:29:20 +0100 | [diff] [blame] | 2272 | int thiscpu = raw_smp_processor_id(); |
| 2273 | int thisnid = cpu_to_node(thiscpu); |
Lee Schermerhorn | 771fb4d | 2012-10-25 14:16:30 +0200 | [diff] [blame] | 2274 | int polnid = -1; |
| 2275 | int ret = -1; |
| 2276 | |
| 2277 | BUG_ON(!vma); |
| 2278 | |
Oleg Nesterov | dd6eecb | 2014-10-09 15:27:57 -0700 | [diff] [blame] | 2279 | pol = get_vma_policy(vma, addr); |
Lee Schermerhorn | 771fb4d | 2012-10-25 14:16:30 +0200 | [diff] [blame] | 2280 | if (!(pol->flags & MPOL_F_MOF)) |
| 2281 | goto out; |
| 2282 | |
| 2283 | switch (pol->mode) { |
| 2284 | case MPOL_INTERLEAVE: |
| 2285 | BUG_ON(addr >= vma->vm_end); |
| 2286 | BUG_ON(addr < vma->vm_start); |
| 2287 | |
| 2288 | pgoff = vma->vm_pgoff; |
| 2289 | pgoff += (addr - vma->vm_start) >> PAGE_SHIFT; |
| 2290 | polnid = offset_il_node(pol, vma, pgoff); |
| 2291 | break; |
| 2292 | |
| 2293 | case MPOL_PREFERRED: |
| 2294 | if (pol->flags & MPOL_F_LOCAL) |
| 2295 | polnid = numa_node_id(); |
| 2296 | else |
| 2297 | polnid = pol->v.preferred_node; |
| 2298 | break; |
| 2299 | |
| 2300 | case MPOL_BIND: |
Mel Gorman | c33d6c0 | 2016-05-19 17:14:10 -0700 | [diff] [blame] | 2301 | |
Lee Schermerhorn | 771fb4d | 2012-10-25 14:16:30 +0200 | [diff] [blame] | 2302 | /* |
| 2303 | * allows binding to multiple nodes. |
| 2304 | * use current page if in policy nodemask, |
| 2305 | * else select nearest allowed node, if any. |
| 2306 | * If no allowed nodes, use current [!misplaced]. |
| 2307 | */ |
| 2308 | if (node_isset(curnid, pol->v.nodes)) |
| 2309 | goto out; |
Mel Gorman | c33d6c0 | 2016-05-19 17:14:10 -0700 | [diff] [blame] | 2310 | z = first_zones_zonelist( |
Lee Schermerhorn | 771fb4d | 2012-10-25 14:16:30 +0200 | [diff] [blame] | 2311 | node_zonelist(numa_node_id(), GFP_HIGHUSER), |
| 2312 | gfp_zone(GFP_HIGHUSER), |
Mel Gorman | c33d6c0 | 2016-05-19 17:14:10 -0700 | [diff] [blame] | 2313 | &pol->v.nodes); |
| 2314 | polnid = z->zone->node; |
Lee Schermerhorn | 771fb4d | 2012-10-25 14:16:30 +0200 | [diff] [blame] | 2315 | break; |
| 2316 | |
| 2317 | default: |
| 2318 | BUG(); |
| 2319 | } |
Mel Gorman | 5606e38 | 2012-11-02 18:19:13 +0000 | [diff] [blame] | 2320 | |
| 2321 | /* Migrate the page towards the node whose CPU is referencing it */ |
Mel Gorman | e42c8ff | 2012-11-12 09:17:07 +0000 | [diff] [blame] | 2322 | if (pol->flags & MPOL_F_MORON) { |
Peter Zijlstra | 9057289 | 2013-10-07 11:29:20 +0100 | [diff] [blame] | 2323 | polnid = thisnid; |
Mel Gorman | 5606e38 | 2012-11-02 18:19:13 +0000 | [diff] [blame] | 2324 | |
Rik van Riel | 10f3904 | 2014-01-27 17:03:44 -0500 | [diff] [blame] | 2325 | if (!should_numa_migrate_memory(current, page, curnid, thiscpu)) |
Rik van Riel | de1c9ce | 2013-10-07 11:29:39 +0100 | [diff] [blame] | 2326 | goto out; |
Mel Gorman | e42c8ff | 2012-11-12 09:17:07 +0000 | [diff] [blame] | 2327 | } |
| 2328 | |
Lee Schermerhorn | 771fb4d | 2012-10-25 14:16:30 +0200 | [diff] [blame] | 2329 | if (curnid != polnid) |
| 2330 | ret = polnid; |
| 2331 | out: |
| 2332 | mpol_cond_put(pol); |
| 2333 | |
| 2334 | return ret; |
| 2335 | } |
| 2336 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2337 | static void sp_delete(struct shared_policy *sp, struct sp_node *n) |
| 2338 | { |
Paul Mundt | 140d5a4 | 2007-07-15 23:38:16 -0700 | [diff] [blame] | 2339 | pr_debug("deleting %lx-l%lx\n", n->start, n->end); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2340 | rb_erase(&n->nd, &sp->root); |
KOSAKI Motohiro | 63f74ca | 2012-10-08 16:29:19 -0700 | [diff] [blame] | 2341 | sp_free(n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2342 | } |
| 2343 | |
Mel Gorman | 42288fe | 2012-12-21 23:10:25 +0000 | [diff] [blame] | 2344 | static void sp_node_init(struct sp_node *node, unsigned long start, |
| 2345 | unsigned long end, struct mempolicy *pol) |
| 2346 | { |
| 2347 | node->start = start; |
| 2348 | node->end = end; |
| 2349 | node->policy = pol; |
| 2350 | } |
| 2351 | |
Adrian Bunk | dbcb0f1 | 2007-10-16 01:26:26 -0700 | [diff] [blame] | 2352 | static struct sp_node *sp_alloc(unsigned long start, unsigned long end, |
| 2353 | struct mempolicy *pol) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2354 | { |
KOSAKI Motohiro | 869833f2 | 2012-10-08 16:29:16 -0700 | [diff] [blame] | 2355 | struct sp_node *n; |
| 2356 | struct mempolicy *newpol; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2357 | |
KOSAKI Motohiro | 869833f2 | 2012-10-08 16:29:16 -0700 | [diff] [blame] | 2358 | n = kmem_cache_alloc(sn_cache, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2359 | if (!n) |
| 2360 | return NULL; |
KOSAKI Motohiro | 869833f2 | 2012-10-08 16:29:16 -0700 | [diff] [blame] | 2361 | |
| 2362 | newpol = mpol_dup(pol); |
| 2363 | if (IS_ERR(newpol)) { |
| 2364 | kmem_cache_free(sn_cache, n); |
| 2365 | return NULL; |
| 2366 | } |
| 2367 | newpol->flags |= MPOL_F_SHARED; |
Mel Gorman | 42288fe | 2012-12-21 23:10:25 +0000 | [diff] [blame] | 2368 | sp_node_init(n, start, end, newpol); |
KOSAKI Motohiro | 869833f2 | 2012-10-08 16:29:16 -0700 | [diff] [blame] | 2369 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2370 | return n; |
| 2371 | } |
| 2372 | |
| 2373 | /* Replace a policy range. */ |
| 2374 | static int shared_policy_replace(struct shared_policy *sp, unsigned long start, |
| 2375 | unsigned long end, struct sp_node *new) |
| 2376 | { |
Mel Gorman | b22d127 | 2012-10-08 16:29:17 -0700 | [diff] [blame] | 2377 | struct sp_node *n; |
Mel Gorman | 42288fe | 2012-12-21 23:10:25 +0000 | [diff] [blame] | 2378 | struct sp_node *n_new = NULL; |
| 2379 | struct mempolicy *mpol_new = NULL; |
Mel Gorman | b22d127 | 2012-10-08 16:29:17 -0700 | [diff] [blame] | 2380 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2381 | |
Mel Gorman | 42288fe | 2012-12-21 23:10:25 +0000 | [diff] [blame] | 2382 | restart: |
Nathan Zimmer | 4a8c7bb | 2016-01-14 15:18:36 -0800 | [diff] [blame] | 2383 | write_lock(&sp->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2384 | n = sp_lookup(sp, start, end); |
| 2385 | /* Take care of old policies in the same range. */ |
| 2386 | while (n && n->start < end) { |
| 2387 | struct rb_node *next = rb_next(&n->nd); |
| 2388 | if (n->start >= start) { |
| 2389 | if (n->end <= end) |
| 2390 | sp_delete(sp, n); |
| 2391 | else |
| 2392 | n->start = end; |
| 2393 | } else { |
| 2394 | /* Old policy spanning whole new range. */ |
| 2395 | if (n->end > end) { |
Mel Gorman | 42288fe | 2012-12-21 23:10:25 +0000 | [diff] [blame] | 2396 | if (!n_new) |
| 2397 | goto alloc_new; |
| 2398 | |
| 2399 | *mpol_new = *n->policy; |
| 2400 | atomic_set(&mpol_new->refcnt, 1); |
KOSAKI Motohiro | 7880639 | 2013-03-08 12:43:29 -0800 | [diff] [blame] | 2401 | sp_node_init(n_new, end, n->end, mpol_new); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2402 | n->end = start; |
Hillf Danton | 5ca3957 | 2013-03-08 12:43:28 -0800 | [diff] [blame] | 2403 | sp_insert(sp, n_new); |
Mel Gorman | 42288fe | 2012-12-21 23:10:25 +0000 | [diff] [blame] | 2404 | n_new = NULL; |
| 2405 | mpol_new = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2406 | break; |
| 2407 | } else |
| 2408 | n->end = start; |
| 2409 | } |
| 2410 | if (!next) |
| 2411 | break; |
| 2412 | n = rb_entry(next, struct sp_node, nd); |
| 2413 | } |
| 2414 | if (new) |
| 2415 | sp_insert(sp, new); |
Nathan Zimmer | 4a8c7bb | 2016-01-14 15:18:36 -0800 | [diff] [blame] | 2416 | write_unlock(&sp->lock); |
Mel Gorman | 42288fe | 2012-12-21 23:10:25 +0000 | [diff] [blame] | 2417 | ret = 0; |
| 2418 | |
| 2419 | err_out: |
| 2420 | if (mpol_new) |
| 2421 | mpol_put(mpol_new); |
| 2422 | if (n_new) |
| 2423 | kmem_cache_free(sn_cache, n_new); |
| 2424 | |
Mel Gorman | b22d127 | 2012-10-08 16:29:17 -0700 | [diff] [blame] | 2425 | return ret; |
Mel Gorman | 42288fe | 2012-12-21 23:10:25 +0000 | [diff] [blame] | 2426 | |
| 2427 | alloc_new: |
Nathan Zimmer | 4a8c7bb | 2016-01-14 15:18:36 -0800 | [diff] [blame] | 2428 | write_unlock(&sp->lock); |
Mel Gorman | 42288fe | 2012-12-21 23:10:25 +0000 | [diff] [blame] | 2429 | ret = -ENOMEM; |
| 2430 | n_new = kmem_cache_alloc(sn_cache, GFP_KERNEL); |
| 2431 | if (!n_new) |
| 2432 | goto err_out; |
| 2433 | mpol_new = kmem_cache_alloc(policy_cache, GFP_KERNEL); |
| 2434 | if (!mpol_new) |
| 2435 | goto err_out; |
| 2436 | goto restart; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2437 | } |
| 2438 | |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2439 | /** |
| 2440 | * mpol_shared_policy_init - initialize shared policy for inode |
| 2441 | * @sp: pointer to inode shared policy |
| 2442 | * @mpol: struct mempolicy to install |
| 2443 | * |
| 2444 | * Install non-NULL @mpol in inode's shared policy rb-tree. |
| 2445 | * On entry, the current task has a reference on a non-NULL @mpol. |
| 2446 | * This must be released on exit. |
KAMEZAWA Hiroyuki | 4bfc449 | 2009-08-06 15:07:33 -0700 | [diff] [blame] | 2447 | * This is called at get_inode() calls and we can use GFP_KERNEL. |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2448 | */ |
| 2449 | void mpol_shared_policy_init(struct shared_policy *sp, struct mempolicy *mpol) |
Robin Holt | 7339ff8 | 2006-01-14 13:20:48 -0800 | [diff] [blame] | 2450 | { |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 2451 | int ret; |
| 2452 | |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2453 | sp->root = RB_ROOT; /* empty tree == default mempolicy */ |
Nathan Zimmer | 4a8c7bb | 2016-01-14 15:18:36 -0800 | [diff] [blame] | 2454 | rwlock_init(&sp->lock); |
Robin Holt | 7339ff8 | 2006-01-14 13:20:48 -0800 | [diff] [blame] | 2455 | |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2456 | if (mpol) { |
| 2457 | struct vm_area_struct pvma; |
| 2458 | struct mempolicy *new; |
KAMEZAWA Hiroyuki | 4bfc449 | 2009-08-06 15:07:33 -0700 | [diff] [blame] | 2459 | NODEMASK_SCRATCH(scratch); |
Robin Holt | 7339ff8 | 2006-01-14 13:20:48 -0800 | [diff] [blame] | 2460 | |
KAMEZAWA Hiroyuki | 4bfc449 | 2009-08-06 15:07:33 -0700 | [diff] [blame] | 2461 | if (!scratch) |
Lee Schermerhorn | 5c0c165 | 2010-06-29 15:05:30 -0700 | [diff] [blame] | 2462 | goto put_mpol; |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2463 | /* contextualize the tmpfs mount point mempolicy */ |
| 2464 | new = mpol_new(mpol->mode, mpol->flags, &mpol->w.user_nodemask); |
Lee Schermerhorn | 15d7783 | 2010-05-24 14:32:04 -0700 | [diff] [blame] | 2465 | if (IS_ERR(new)) |
Dan Carpenter | 0cae345 | 2010-05-25 23:42:58 -0700 | [diff] [blame] | 2466 | goto free_scratch; /* no valid nodemask intersection */ |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 2467 | |
| 2468 | task_lock(current); |
KAMEZAWA Hiroyuki | 4bfc449 | 2009-08-06 15:07:33 -0700 | [diff] [blame] | 2469 | ret = mpol_set_nodemask(new, &mpol->w.user_nodemask, scratch); |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 2470 | task_unlock(current); |
Lee Schermerhorn | 15d7783 | 2010-05-24 14:32:04 -0700 | [diff] [blame] | 2471 | if (ret) |
Lee Schermerhorn | 5c0c165 | 2010-06-29 15:05:30 -0700 | [diff] [blame] | 2472 | goto put_new; |
Robin Holt | 7339ff8 | 2006-01-14 13:20:48 -0800 | [diff] [blame] | 2473 | |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2474 | /* Create pseudo-vma that contains just the policy */ |
| 2475 | memset(&pvma, 0, sizeof(struct vm_area_struct)); |
| 2476 | pvma.vm_end = TASK_SIZE; /* policy covers entire file */ |
| 2477 | mpol_set_shared_policy(sp, &pvma, new); /* adds ref */ |
Lee Schermerhorn | 15d7783 | 2010-05-24 14:32:04 -0700 | [diff] [blame] | 2478 | |
Lee Schermerhorn | 5c0c165 | 2010-06-29 15:05:30 -0700 | [diff] [blame] | 2479 | put_new: |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2480 | mpol_put(new); /* drop initial ref */ |
Dan Carpenter | 0cae345 | 2010-05-25 23:42:58 -0700 | [diff] [blame] | 2481 | free_scratch: |
KAMEZAWA Hiroyuki | 4bfc449 | 2009-08-06 15:07:33 -0700 | [diff] [blame] | 2482 | NODEMASK_SCRATCH_FREE(scratch); |
Lee Schermerhorn | 5c0c165 | 2010-06-29 15:05:30 -0700 | [diff] [blame] | 2483 | put_mpol: |
| 2484 | mpol_put(mpol); /* drop our incoming ref on sb mpol */ |
Robin Holt | 7339ff8 | 2006-01-14 13:20:48 -0800 | [diff] [blame] | 2485 | } |
| 2486 | } |
| 2487 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2488 | int mpol_set_shared_policy(struct shared_policy *info, |
| 2489 | struct vm_area_struct *vma, struct mempolicy *npol) |
| 2490 | { |
| 2491 | int err; |
| 2492 | struct sp_node *new = NULL; |
| 2493 | unsigned long sz = vma_pages(vma); |
| 2494 | |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 2495 | pr_debug("set_shared_policy %lx sz %lu %d %d %lx\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2496 | vma->vm_pgoff, |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 2497 | sz, npol ? npol->mode : -1, |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 2498 | npol ? npol->flags : -1, |
David Rientjes | 00ef2d2 | 2013-02-22 16:35:36 -0800 | [diff] [blame] | 2499 | npol ? nodes_addr(npol->v.nodes)[0] : NUMA_NO_NODE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2500 | |
| 2501 | if (npol) { |
| 2502 | new = sp_alloc(vma->vm_pgoff, vma->vm_pgoff + sz, npol); |
| 2503 | if (!new) |
| 2504 | return -ENOMEM; |
| 2505 | } |
| 2506 | err = shared_policy_replace(info, vma->vm_pgoff, vma->vm_pgoff+sz, new); |
| 2507 | if (err && new) |
KOSAKI Motohiro | 63f74ca | 2012-10-08 16:29:19 -0700 | [diff] [blame] | 2508 | sp_free(new); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2509 | return err; |
| 2510 | } |
| 2511 | |
| 2512 | /* Free a backing policy store on inode delete. */ |
| 2513 | void mpol_free_shared_policy(struct shared_policy *p) |
| 2514 | { |
| 2515 | struct sp_node *n; |
| 2516 | struct rb_node *next; |
| 2517 | |
| 2518 | if (!p->root.rb_node) |
| 2519 | return; |
Nathan Zimmer | 4a8c7bb | 2016-01-14 15:18:36 -0800 | [diff] [blame] | 2520 | write_lock(&p->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2521 | next = rb_first(&p->root); |
| 2522 | while (next) { |
| 2523 | n = rb_entry(next, struct sp_node, nd); |
| 2524 | next = rb_next(&n->nd); |
KOSAKI Motohiro | 63f74ca | 2012-10-08 16:29:19 -0700 | [diff] [blame] | 2525 | sp_delete(p, n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2526 | } |
Nathan Zimmer | 4a8c7bb | 2016-01-14 15:18:36 -0800 | [diff] [blame] | 2527 | write_unlock(&p->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2528 | } |
| 2529 | |
Mel Gorman | 1a687c2 | 2012-11-22 11:16:36 +0000 | [diff] [blame] | 2530 | #ifdef CONFIG_NUMA_BALANCING |
Mel Gorman | c297663 | 2014-01-29 14:05:42 -0800 | [diff] [blame] | 2531 | static int __initdata numabalancing_override; |
Mel Gorman | 1a687c2 | 2012-11-22 11:16:36 +0000 | [diff] [blame] | 2532 | |
| 2533 | static void __init check_numabalancing_enable(void) |
| 2534 | { |
| 2535 | bool numabalancing_default = false; |
| 2536 | |
| 2537 | if (IS_ENABLED(CONFIG_NUMA_BALANCING_DEFAULT_ENABLED)) |
| 2538 | numabalancing_default = true; |
| 2539 | |
Mel Gorman | c297663 | 2014-01-29 14:05:42 -0800 | [diff] [blame] | 2540 | /* Parsed by setup_numabalancing. override == 1 enables, -1 disables */ |
| 2541 | if (numabalancing_override) |
| 2542 | set_numabalancing_state(numabalancing_override == 1); |
| 2543 | |
Mel Gorman | b0dc2b9 | 2015-05-14 15:17:09 -0700 | [diff] [blame] | 2544 | if (num_online_nodes() > 1 && !numabalancing_override) { |
Joe Perches | 756a025f0 | 2016-03-17 14:19:47 -0700 | [diff] [blame] | 2545 | pr_info("%s automatic NUMA balancing. Configure with numa_balancing= or the kernel.numa_balancing sysctl\n", |
Mel Gorman | c297663 | 2014-01-29 14:05:42 -0800 | [diff] [blame] | 2546 | numabalancing_default ? "Enabling" : "Disabling"); |
Mel Gorman | 1a687c2 | 2012-11-22 11:16:36 +0000 | [diff] [blame] | 2547 | set_numabalancing_state(numabalancing_default); |
| 2548 | } |
| 2549 | } |
| 2550 | |
| 2551 | static int __init setup_numabalancing(char *str) |
| 2552 | { |
| 2553 | int ret = 0; |
| 2554 | if (!str) |
| 2555 | goto out; |
Mel Gorman | 1a687c2 | 2012-11-22 11:16:36 +0000 | [diff] [blame] | 2556 | |
| 2557 | if (!strcmp(str, "enable")) { |
Mel Gorman | c297663 | 2014-01-29 14:05:42 -0800 | [diff] [blame] | 2558 | numabalancing_override = 1; |
Mel Gorman | 1a687c2 | 2012-11-22 11:16:36 +0000 | [diff] [blame] | 2559 | ret = 1; |
| 2560 | } else if (!strcmp(str, "disable")) { |
Mel Gorman | c297663 | 2014-01-29 14:05:42 -0800 | [diff] [blame] | 2561 | numabalancing_override = -1; |
Mel Gorman | 1a687c2 | 2012-11-22 11:16:36 +0000 | [diff] [blame] | 2562 | ret = 1; |
| 2563 | } |
| 2564 | out: |
| 2565 | if (!ret) |
Andrew Morton | 4a404be | 2014-01-29 14:05:43 -0800 | [diff] [blame] | 2566 | pr_warn("Unable to parse numa_balancing=\n"); |
Mel Gorman | 1a687c2 | 2012-11-22 11:16:36 +0000 | [diff] [blame] | 2567 | |
| 2568 | return ret; |
| 2569 | } |
| 2570 | __setup("numa_balancing=", setup_numabalancing); |
| 2571 | #else |
| 2572 | static inline void __init check_numabalancing_enable(void) |
| 2573 | { |
| 2574 | } |
| 2575 | #endif /* CONFIG_NUMA_BALANCING */ |
| 2576 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2577 | /* assumes fs == KERNEL_DS */ |
| 2578 | void __init numa_policy_init(void) |
| 2579 | { |
Paul Mundt | b71636e | 2007-07-15 23:38:15 -0700 | [diff] [blame] | 2580 | nodemask_t interleave_nodes; |
| 2581 | unsigned long largest = 0; |
| 2582 | int nid, prefer = 0; |
| 2583 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2584 | policy_cache = kmem_cache_create("numa_policy", |
| 2585 | sizeof(struct mempolicy), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 2586 | 0, SLAB_PANIC, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2587 | |
| 2588 | sn_cache = kmem_cache_create("shared_policy_node", |
| 2589 | sizeof(struct sp_node), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 2590 | 0, SLAB_PANIC, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2591 | |
Mel Gorman | 5606e38 | 2012-11-02 18:19:13 +0000 | [diff] [blame] | 2592 | for_each_node(nid) { |
| 2593 | preferred_node_policy[nid] = (struct mempolicy) { |
| 2594 | .refcnt = ATOMIC_INIT(1), |
| 2595 | .mode = MPOL_PREFERRED, |
| 2596 | .flags = MPOL_F_MOF | MPOL_F_MORON, |
| 2597 | .v = { .preferred_node = nid, }, |
| 2598 | }; |
| 2599 | } |
| 2600 | |
Paul Mundt | b71636e | 2007-07-15 23:38:15 -0700 | [diff] [blame] | 2601 | /* |
| 2602 | * Set interleaving policy for system init. Interleaving is only |
| 2603 | * enabled across suitably sized nodes (default is >= 16MB), or |
| 2604 | * fall back to the largest node if they're all smaller. |
| 2605 | */ |
| 2606 | nodes_clear(interleave_nodes); |
Lai Jiangshan | 01f13bd | 2012-12-12 13:51:33 -0800 | [diff] [blame] | 2607 | for_each_node_state(nid, N_MEMORY) { |
Paul Mundt | b71636e | 2007-07-15 23:38:15 -0700 | [diff] [blame] | 2608 | unsigned long total_pages = node_present_pages(nid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2609 | |
Paul Mundt | b71636e | 2007-07-15 23:38:15 -0700 | [diff] [blame] | 2610 | /* Preserve the largest node */ |
| 2611 | if (largest < total_pages) { |
| 2612 | largest = total_pages; |
| 2613 | prefer = nid; |
| 2614 | } |
| 2615 | |
| 2616 | /* Interleave this node? */ |
| 2617 | if ((total_pages << PAGE_SHIFT) >= (16 << 20)) |
| 2618 | node_set(nid, interleave_nodes); |
| 2619 | } |
| 2620 | |
| 2621 | /* All too small, use the largest */ |
| 2622 | if (unlikely(nodes_empty(interleave_nodes))) |
| 2623 | node_set(prefer, interleave_nodes); |
| 2624 | |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 2625 | if (do_set_mempolicy(MPOL_INTERLEAVE, 0, &interleave_nodes)) |
Mitchel Humpherys | b1de0d1 | 2014-06-06 14:38:30 -0700 | [diff] [blame] | 2626 | pr_err("%s: interleaving failed\n", __func__); |
Mel Gorman | 1a687c2 | 2012-11-22 11:16:36 +0000 | [diff] [blame] | 2627 | |
| 2628 | check_numabalancing_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2629 | } |
| 2630 | |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 2631 | /* Reset policy of current process to default */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2632 | void numa_default_policy(void) |
| 2633 | { |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 2634 | do_set_mempolicy(MPOL_DEFAULT, 0, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2635 | } |
Paul Jackson | 68860ec | 2005-10-30 15:02:36 -0800 | [diff] [blame] | 2636 | |
Paul Jackson | 4225399 | 2006-01-08 01:01:59 -0800 | [diff] [blame] | 2637 | /* |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2638 | * Parse and format mempolicy from/to strings |
| 2639 | */ |
| 2640 | |
| 2641 | /* |
Hugh Dickins | f2a07f4 | 2013-01-02 02:01:33 -0800 | [diff] [blame] | 2642 | * "local" is implemented internally by MPOL_PREFERRED with MPOL_F_LOCAL flag. |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2643 | */ |
Lee Schermerhorn | 345ace9 | 2010-05-24 14:32:04 -0700 | [diff] [blame] | 2644 | static const char * const policy_modes[] = |
| 2645 | { |
| 2646 | [MPOL_DEFAULT] = "default", |
| 2647 | [MPOL_PREFERRED] = "prefer", |
| 2648 | [MPOL_BIND] = "bind", |
| 2649 | [MPOL_INTERLEAVE] = "interleave", |
Lee Schermerhorn | d3a7103 | 2012-10-25 14:16:29 +0200 | [diff] [blame] | 2650 | [MPOL_LOCAL] = "local", |
Lee Schermerhorn | 345ace9 | 2010-05-24 14:32:04 -0700 | [diff] [blame] | 2651 | }; |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2652 | |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2653 | |
| 2654 | #ifdef CONFIG_TMPFS |
| 2655 | /** |
Hugh Dickins | f2a07f4 | 2013-01-02 02:01:33 -0800 | [diff] [blame] | 2656 | * mpol_parse_str - parse string to mempolicy, for tmpfs mpol mount option. |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2657 | * @str: string containing mempolicy to parse |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2658 | * @mpol: pointer to struct mempolicy pointer, returned on success. |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2659 | * |
| 2660 | * Format of input: |
| 2661 | * <mode>[=<flags>][:<nodelist>] |
| 2662 | * |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2663 | * On success, returns 0, else 1 |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2664 | */ |
Hugh Dickins | a7a88b2 | 2013-01-02 02:04:23 -0800 | [diff] [blame] | 2665 | int mpol_parse_str(char *str, struct mempolicy **mpol) |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2666 | { |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2667 | struct mempolicy *new = NULL; |
Lee Schermerhorn | b4652e8 | 2010-05-24 14:32:03 -0700 | [diff] [blame] | 2668 | unsigned short mode; |
Hugh Dickins | f2a07f4 | 2013-01-02 02:01:33 -0800 | [diff] [blame] | 2669 | unsigned short mode_flags; |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2670 | nodemask_t nodes; |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2671 | char *nodelist = strchr(str, ':'); |
| 2672 | char *flags = strchr(str, '='); |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2673 | int err = 1; |
| 2674 | |
| 2675 | if (nodelist) { |
| 2676 | /* NUL-terminate mode or flags string */ |
| 2677 | *nodelist++ = '\0'; |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2678 | if (nodelist_parse(nodelist, nodes)) |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2679 | goto out; |
Lai Jiangshan | 01f13bd | 2012-12-12 13:51:33 -0800 | [diff] [blame] | 2680 | if (!nodes_subset(nodes, node_states[N_MEMORY])) |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2681 | goto out; |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2682 | } else |
| 2683 | nodes_clear(nodes); |
| 2684 | |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2685 | if (flags) |
| 2686 | *flags++ = '\0'; /* terminate mode string */ |
| 2687 | |
Peter Zijlstra | 479e280 | 2012-10-25 14:16:28 +0200 | [diff] [blame] | 2688 | for (mode = 0; mode < MPOL_MAX; mode++) { |
Lee Schermerhorn | 345ace9 | 2010-05-24 14:32:04 -0700 | [diff] [blame] | 2689 | if (!strcmp(str, policy_modes[mode])) { |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2690 | break; |
| 2691 | } |
| 2692 | } |
Mel Gorman | a720094 | 2012-11-16 09:37:58 +0000 | [diff] [blame] | 2693 | if (mode >= MPOL_MAX) |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2694 | goto out; |
| 2695 | |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2696 | switch (mode) { |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2697 | case MPOL_PREFERRED: |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2698 | /* |
| 2699 | * Insist on a nodelist of one node only |
| 2700 | */ |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2701 | if (nodelist) { |
| 2702 | char *rest = nodelist; |
| 2703 | while (isdigit(*rest)) |
| 2704 | rest++; |
KOSAKI Motohiro | 926f2ae | 2010-03-23 13:35:32 -0700 | [diff] [blame] | 2705 | if (*rest) |
| 2706 | goto out; |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2707 | } |
| 2708 | break; |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2709 | case MPOL_INTERLEAVE: |
| 2710 | /* |
| 2711 | * Default to online nodes with memory if no nodelist |
| 2712 | */ |
| 2713 | if (!nodelist) |
Lai Jiangshan | 01f13bd | 2012-12-12 13:51:33 -0800 | [diff] [blame] | 2714 | nodes = node_states[N_MEMORY]; |
Lee Schermerhorn | 3f226aa | 2008-04-28 02:13:24 -0700 | [diff] [blame] | 2715 | break; |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2716 | case MPOL_LOCAL: |
Lee Schermerhorn | 3f226aa | 2008-04-28 02:13:24 -0700 | [diff] [blame] | 2717 | /* |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2718 | * Don't allow a nodelist; mpol_new() checks flags |
Lee Schermerhorn | 3f226aa | 2008-04-28 02:13:24 -0700 | [diff] [blame] | 2719 | */ |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2720 | if (nodelist) |
Lee Schermerhorn | 3f226aa | 2008-04-28 02:13:24 -0700 | [diff] [blame] | 2721 | goto out; |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2722 | mode = MPOL_PREFERRED; |
Lee Schermerhorn | 3f226aa | 2008-04-28 02:13:24 -0700 | [diff] [blame] | 2723 | break; |
Ravikiran G Thirumalai | 413b43d | 2010-03-23 13:35:28 -0700 | [diff] [blame] | 2724 | case MPOL_DEFAULT: |
| 2725 | /* |
| 2726 | * Insist on a empty nodelist |
| 2727 | */ |
| 2728 | if (!nodelist) |
| 2729 | err = 0; |
| 2730 | goto out; |
KOSAKI Motohiro | d69b2e6 | 2010-03-23 13:35:30 -0700 | [diff] [blame] | 2731 | case MPOL_BIND: |
| 2732 | /* |
| 2733 | * Insist on a nodelist |
| 2734 | */ |
| 2735 | if (!nodelist) |
| 2736 | goto out; |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2737 | } |
| 2738 | |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2739 | mode_flags = 0; |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2740 | if (flags) { |
| 2741 | /* |
| 2742 | * Currently, we only support two mutually exclusive |
| 2743 | * mode flags. |
| 2744 | */ |
| 2745 | if (!strcmp(flags, "static")) |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2746 | mode_flags |= MPOL_F_STATIC_NODES; |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2747 | else if (!strcmp(flags, "relative")) |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2748 | mode_flags |= MPOL_F_RELATIVE_NODES; |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2749 | else |
KOSAKI Motohiro | 926f2ae | 2010-03-23 13:35:32 -0700 | [diff] [blame] | 2750 | goto out; |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2751 | } |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2752 | |
| 2753 | new = mpol_new(mode, mode_flags, &nodes); |
| 2754 | if (IS_ERR(new)) |
KOSAKI Motohiro | 926f2ae | 2010-03-23 13:35:32 -0700 | [diff] [blame] | 2755 | goto out; |
| 2756 | |
Hugh Dickins | f2a07f4 | 2013-01-02 02:01:33 -0800 | [diff] [blame] | 2757 | /* |
| 2758 | * Save nodes for mpol_to_str() to show the tmpfs mount options |
| 2759 | * for /proc/mounts, /proc/pid/mounts and /proc/pid/mountinfo. |
| 2760 | */ |
| 2761 | if (mode != MPOL_PREFERRED) |
| 2762 | new->v.nodes = nodes; |
| 2763 | else if (nodelist) |
| 2764 | new->v.preferred_node = first_node(nodes); |
| 2765 | else |
| 2766 | new->flags |= MPOL_F_LOCAL; |
| 2767 | |
| 2768 | /* |
| 2769 | * Save nodes for contextualization: this will be used to "clone" |
| 2770 | * the mempolicy in a specific context [cpuset] at a later time. |
| 2771 | */ |
| 2772 | new->w.user_nodemask = nodes; |
| 2773 | |
KOSAKI Motohiro | 926f2ae | 2010-03-23 13:35:32 -0700 | [diff] [blame] | 2774 | err = 0; |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2775 | |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2776 | out: |
| 2777 | /* Restore string for error message */ |
| 2778 | if (nodelist) |
| 2779 | *--nodelist = ':'; |
| 2780 | if (flags) |
| 2781 | *--flags = '='; |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2782 | if (!err) |
| 2783 | *mpol = new; |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2784 | return err; |
| 2785 | } |
| 2786 | #endif /* CONFIG_TMPFS */ |
| 2787 | |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2788 | /** |
| 2789 | * mpol_to_str - format a mempolicy structure for printing |
| 2790 | * @buffer: to contain formatted mempolicy string |
| 2791 | * @maxlen: length of @buffer |
| 2792 | * @pol: pointer to mempolicy to be formatted |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2793 | * |
David Rientjes | 948927e | 2013-11-12 15:07:28 -0800 | [diff] [blame] | 2794 | * Convert @pol into a string. If @buffer is too short, truncate the string. |
| 2795 | * Recommend a @maxlen of at least 32 for the longest mode, "interleave", the |
| 2796 | * longest flag, "relative", and to display at least a few node ids. |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2797 | */ |
David Rientjes | 948927e | 2013-11-12 15:07:28 -0800 | [diff] [blame] | 2798 | void mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol) |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2799 | { |
| 2800 | char *p = buffer; |
David Rientjes | 948927e | 2013-11-12 15:07:28 -0800 | [diff] [blame] | 2801 | nodemask_t nodes = NODE_MASK_NONE; |
| 2802 | unsigned short mode = MPOL_DEFAULT; |
| 2803 | unsigned short flags = 0; |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2804 | |
David Rientjes | 8790c71 | 2014-01-30 15:46:08 -0800 | [diff] [blame] | 2805 | if (pol && pol != &default_policy && !(pol->flags & MPOL_F_MORON)) { |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 2806 | mode = pol->mode; |
David Rientjes | 948927e | 2013-11-12 15:07:28 -0800 | [diff] [blame] | 2807 | flags = pol->flags; |
| 2808 | } |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 2809 | |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2810 | switch (mode) { |
| 2811 | case MPOL_DEFAULT: |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2812 | break; |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2813 | case MPOL_PREFERRED: |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 2814 | if (flags & MPOL_F_LOCAL) |
Hugh Dickins | f2a07f4 | 2013-01-02 02:01:33 -0800 | [diff] [blame] | 2815 | mode = MPOL_LOCAL; |
Lee Schermerhorn | 53f2556 | 2008-04-28 02:13:20 -0700 | [diff] [blame] | 2816 | else |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 2817 | node_set(pol->v.preferred_node, nodes); |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2818 | break; |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2819 | case MPOL_BIND: |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2820 | case MPOL_INTERLEAVE: |
Hugh Dickins | f2a07f4 | 2013-01-02 02:01:33 -0800 | [diff] [blame] | 2821 | nodes = pol->v.nodes; |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2822 | break; |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2823 | default: |
David Rientjes | 948927e | 2013-11-12 15:07:28 -0800 | [diff] [blame] | 2824 | WARN_ON_ONCE(1); |
| 2825 | snprintf(p, maxlen, "unknown"); |
| 2826 | return; |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2827 | } |
| 2828 | |
David Rientjes | b7a9f42 | 2013-11-21 14:32:06 -0800 | [diff] [blame] | 2829 | p += snprintf(p, maxlen, "%s", policy_modes[mode]); |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2830 | |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 2831 | if (flags & MPOL_MODE_FLAGS) { |
David Rientjes | 948927e | 2013-11-12 15:07:28 -0800 | [diff] [blame] | 2832 | p += snprintf(p, buffer + maxlen - p, "="); |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 2833 | |
Lee Schermerhorn | 2291990 | 2008-04-28 02:13:22 -0700 | [diff] [blame] | 2834 | /* |
| 2835 | * Currently, the only defined flags are mutually exclusive |
| 2836 | */ |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 2837 | if (flags & MPOL_F_STATIC_NODES) |
Lee Schermerhorn | 2291990 | 2008-04-28 02:13:22 -0700 | [diff] [blame] | 2838 | p += snprintf(p, buffer + maxlen - p, "static"); |
| 2839 | else if (flags & MPOL_F_RELATIVE_NODES) |
| 2840 | p += snprintf(p, buffer + maxlen - p, "relative"); |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 2841 | } |
| 2842 | |
Tejun Heo | 9e763e0 | 2015-02-13 14:38:02 -0800 | [diff] [blame] | 2843 | if (!nodes_empty(nodes)) |
| 2844 | p += scnprintf(p, buffer + maxlen - p, ":%*pbl", |
| 2845 | nodemask_pr_args(&nodes)); |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2846 | } |