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. |
| 29 | * As a special case node -1 here means do the allocation |
| 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 | |
| 68 | #include <linux/mempolicy.h> |
| 69 | #include <linux/mm.h> |
| 70 | #include <linux/highmem.h> |
| 71 | #include <linux/hugetlb.h> |
| 72 | #include <linux/kernel.h> |
| 73 | #include <linux/sched.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | #include <linux/nodemask.h> |
| 75 | #include <linux/cpuset.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | #include <linux/slab.h> |
| 77 | #include <linux/string.h> |
Paul Gortmaker | b95f1b31 | 2011-10-16 02:01:52 -0400 | [diff] [blame] | 78 | #include <linux/export.h> |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 79 | #include <linux/nsproxy.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | #include <linux/interrupt.h> |
| 81 | #include <linux/init.h> |
| 82 | #include <linux/compat.h> |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 83 | #include <linux/swap.h> |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 84 | #include <linux/seq_file.h> |
| 85 | #include <linux/proc_fs.h> |
Christoph Lameter | b20a350 | 2006-03-22 00:09:12 -0800 | [diff] [blame] | 86 | #include <linux/migrate.h> |
Hugh Dickins | 62b61f6 | 2009-12-14 17:59:33 -0800 | [diff] [blame] | 87 | #include <linux/ksm.h> |
Christoph Lameter | 95a402c | 2006-06-23 02:03:53 -0700 | [diff] [blame] | 88 | #include <linux/rmap.h> |
David Quigley | 86c3a76 | 2006-06-23 02:04:02 -0700 | [diff] [blame] | 89 | #include <linux/security.h> |
Adrian Bunk | dbcb0f1 | 2007-10-16 01:26:26 -0700 | [diff] [blame] | 90 | #include <linux/syscalls.h> |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 91 | #include <linux/ctype.h> |
KOSAKI Motohiro | 6d9c285 | 2009-12-14 17:58:11 -0800 | [diff] [blame] | 92 | #include <linux/mm_inline.h> |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 93 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | #include <asm/tlbflush.h> |
| 95 | #include <asm/uaccess.h> |
Michal Hocko | 778d3b0 | 2011-07-26 16:08:30 -0700 | [diff] [blame] | 96 | #include <linux/random.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | |
Nick Piggin | 62695a8 | 2008-10-18 20:26:09 -0700 | [diff] [blame] | 98 | #include "internal.h" |
| 99 | |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 100 | /* Internal flags */ |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 101 | #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] | 102 | #define MPOL_MF_INVERT (MPOL_MF_INTERNAL << 1) /* Invert check for nodemask */ |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 103 | |
Pekka Enberg | fcc234f | 2006-03-22 00:08:13 -0800 | [diff] [blame] | 104 | static struct kmem_cache *policy_cache; |
| 105 | static struct kmem_cache *sn_cache; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | /* Highest zone. An specific allocation for a zone below that is not |
| 108 | policied. */ |
Christoph Lameter | 6267276 | 2007-02-10 01:43:07 -0800 | [diff] [blame] | 109 | enum zone_type policy_zone = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 111 | /* |
| 112 | * run-time system-wide default policy => local allocation |
| 113 | */ |
H Hartley Sweeten | e754d79 | 2011-10-31 17:09:23 -0700 | [diff] [blame] | 114 | static struct mempolicy default_policy = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | .refcnt = ATOMIC_INIT(1), /* never free it */ |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 116 | .mode = MPOL_PREFERRED, |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 117 | .flags = MPOL_F_LOCAL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | }; |
| 119 | |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 120 | static const struct mempolicy_operations { |
| 121 | int (*create)(struct mempolicy *pol, const nodemask_t *nodes); |
Miao Xie | 708c1bb | 2010-05-24 14:32:07 -0700 | [diff] [blame] | 122 | /* |
| 123 | * If read-side task has no lock to protect task->mempolicy, write-side |
| 124 | * task will rebind the task->mempolicy by two step. The first step is |
| 125 | * setting all the newly nodes, and the second step is cleaning all the |
| 126 | * disallowed nodes. In this way, we can avoid finding no node to alloc |
| 127 | * page. |
| 128 | * If we have a lock to protect task->mempolicy in read-side, we do |
| 129 | * rebind directly. |
| 130 | * |
| 131 | * step: |
| 132 | * MPOL_REBIND_ONCE - do rebind work at once |
| 133 | * MPOL_REBIND_STEP1 - set all the newly nodes |
| 134 | * MPOL_REBIND_STEP2 - clean all the disallowed nodes |
| 135 | */ |
| 136 | void (*rebind)(struct mempolicy *pol, const nodemask_t *nodes, |
| 137 | enum mpol_rebind_step step); |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 138 | } mpol_ops[MPOL_MAX]; |
| 139 | |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 140 | /* Check that the nodemask contains at least one populated zone */ |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 141 | static int is_valid_nodemask(const nodemask_t *nodemask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | { |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 143 | int nd, k; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 145 | for_each_node_mask(nd, *nodemask) { |
| 146 | struct zone *z; |
| 147 | |
| 148 | for (k = 0; k <= policy_zone; k++) { |
| 149 | z = &NODE_DATA(nd)->node_zones[k]; |
| 150 | if (z->present_pages > 0) |
| 151 | return 1; |
Andi Kleen | dd942ae | 2006-02-17 01:39:16 +0100 | [diff] [blame] | 152 | } |
| 153 | } |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 154 | |
| 155 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | } |
| 157 | |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 158 | static inline int mpol_store_user_nodemask(const struct mempolicy *pol) |
| 159 | { |
Bob Liu | 6d55629 | 2010-05-24 14:31:59 -0700 | [diff] [blame] | 160 | return pol->flags & MPOL_MODE_FLAGS; |
David Rientjes | 4c50bc0 | 2008-04-28 02:12:30 -0700 | [diff] [blame] | 161 | } |
| 162 | |
| 163 | static void mpol_relative_nodemask(nodemask_t *ret, const nodemask_t *orig, |
| 164 | const nodemask_t *rel) |
| 165 | { |
| 166 | nodemask_t tmp; |
| 167 | nodes_fold(tmp, *orig, nodes_weight(*rel)); |
| 168 | nodes_onto(*ret, tmp, *rel); |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 169 | } |
| 170 | |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 171 | static int mpol_new_interleave(struct mempolicy *pol, const nodemask_t *nodes) |
| 172 | { |
| 173 | if (nodes_empty(*nodes)) |
| 174 | return -EINVAL; |
| 175 | pol->v.nodes = *nodes; |
| 176 | return 0; |
| 177 | } |
| 178 | |
| 179 | static int mpol_new_preferred(struct mempolicy *pol, const nodemask_t *nodes) |
| 180 | { |
| 181 | if (!nodes) |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 182 | pol->flags |= MPOL_F_LOCAL; /* local allocation */ |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 183 | else if (nodes_empty(*nodes)) |
| 184 | return -EINVAL; /* no allowed nodes */ |
| 185 | else |
| 186 | pol->v.preferred_node = first_node(*nodes); |
| 187 | return 0; |
| 188 | } |
| 189 | |
| 190 | static int mpol_new_bind(struct mempolicy *pol, const nodemask_t *nodes) |
| 191 | { |
| 192 | if (!is_valid_nodemask(nodes)) |
| 193 | return -EINVAL; |
| 194 | pol->v.nodes = *nodes; |
| 195 | return 0; |
| 196 | } |
| 197 | |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 198 | /* |
| 199 | * mpol_set_nodemask is called after mpol_new() to set up the nodemask, if |
| 200 | * any, for the new policy. mpol_new() has already validated the nodes |
| 201 | * parameter with respect to the policy mode and flags. But, we need to |
| 202 | * handle an empty nodemask with MPOL_PREFERRED here. |
| 203 | * |
| 204 | * Must be called holding task's alloc_lock to protect task's mems_allowed |
| 205 | * and mempolicy. May also be called holding the mmap_semaphore for write. |
| 206 | */ |
KAMEZAWA Hiroyuki | 4bfc449 | 2009-08-06 15:07:33 -0700 | [diff] [blame] | 207 | static int mpol_set_nodemask(struct mempolicy *pol, |
| 208 | const nodemask_t *nodes, struct nodemask_scratch *nsc) |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 209 | { |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 210 | int ret; |
| 211 | |
| 212 | /* if mode is MPOL_DEFAULT, pol is NULL. This is right. */ |
| 213 | if (pol == NULL) |
| 214 | return 0; |
KAMEZAWA Hiroyuki | 4bfc449 | 2009-08-06 15:07:33 -0700 | [diff] [blame] | 215 | /* Check N_HIGH_MEMORY */ |
| 216 | nodes_and(nsc->mask1, |
| 217 | cpuset_current_mems_allowed, node_states[N_HIGH_MEMORY]); |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 218 | |
| 219 | VM_BUG_ON(!nodes); |
| 220 | if (pol->mode == MPOL_PREFERRED && nodes_empty(*nodes)) |
| 221 | nodes = NULL; /* explicit local allocation */ |
| 222 | else { |
| 223 | if (pol->flags & MPOL_F_RELATIVE_NODES) |
KAMEZAWA Hiroyuki | 4bfc449 | 2009-08-06 15:07:33 -0700 | [diff] [blame] | 224 | mpol_relative_nodemask(&nsc->mask2, nodes,&nsc->mask1); |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 225 | else |
KAMEZAWA Hiroyuki | 4bfc449 | 2009-08-06 15:07:33 -0700 | [diff] [blame] | 226 | nodes_and(nsc->mask2, *nodes, nsc->mask1); |
| 227 | |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 228 | if (mpol_store_user_nodemask(pol)) |
| 229 | pol->w.user_nodemask = *nodes; |
| 230 | else |
| 231 | pol->w.cpuset_mems_allowed = |
| 232 | cpuset_current_mems_allowed; |
| 233 | } |
| 234 | |
KAMEZAWA Hiroyuki | 4bfc449 | 2009-08-06 15:07:33 -0700 | [diff] [blame] | 235 | if (nodes) |
| 236 | ret = mpol_ops[pol->mode].create(pol, &nsc->mask2); |
| 237 | else |
| 238 | ret = mpol_ops[pol->mode].create(pol, NULL); |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 239 | return ret; |
| 240 | } |
| 241 | |
| 242 | /* |
| 243 | * This function just creates a new policy, does some check and simple |
| 244 | * initialization. You must invoke mpol_set_nodemask() to set nodes. |
| 245 | */ |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 246 | static struct mempolicy *mpol_new(unsigned short mode, unsigned short flags, |
| 247 | nodemask_t *nodes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | { |
| 249 | struct mempolicy *policy; |
| 250 | |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 251 | pr_debug("setting mode %d flags %d nodes[0] %lx\n", |
| 252 | mode, flags, nodes ? nodes_addr(*nodes)[0] : -1); |
Paul Mundt | 140d5a4 | 2007-07-15 23:38:16 -0700 | [diff] [blame] | 253 | |
David Rientjes | 3e1f064 | 2008-04-28 02:12:34 -0700 | [diff] [blame] | 254 | if (mode == MPOL_DEFAULT) { |
| 255 | if (nodes && !nodes_empty(*nodes)) |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 256 | return ERR_PTR(-EINVAL); |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 257 | return NULL; /* simply delete any existing policy */ |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 258 | } |
David Rientjes | 3e1f064 | 2008-04-28 02:12:34 -0700 | [diff] [blame] | 259 | VM_BUG_ON(!nodes); |
| 260 | |
| 261 | /* |
| 262 | * MPOL_PREFERRED cannot be used with MPOL_F_STATIC_NODES or |
| 263 | * MPOL_F_RELATIVE_NODES if the nodemask is empty (local allocation). |
| 264 | * All other modes require a valid pointer to a non-empty nodemask. |
| 265 | */ |
| 266 | if (mode == MPOL_PREFERRED) { |
| 267 | if (nodes_empty(*nodes)) { |
| 268 | if (((flags & MPOL_F_STATIC_NODES) || |
| 269 | (flags & MPOL_F_RELATIVE_NODES))) |
| 270 | return ERR_PTR(-EINVAL); |
David Rientjes | 3e1f064 | 2008-04-28 02:12:34 -0700 | [diff] [blame] | 271 | } |
| 272 | } else if (nodes_empty(*nodes)) |
| 273 | return ERR_PTR(-EINVAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | policy = kmem_cache_alloc(policy_cache, GFP_KERNEL); |
| 275 | if (!policy) |
| 276 | return ERR_PTR(-ENOMEM); |
| 277 | atomic_set(&policy->refcnt, 1); |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 278 | policy->mode = mode; |
David Rientjes | 3e1f064 | 2008-04-28 02:12:34 -0700 | [diff] [blame] | 279 | policy->flags = flags; |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 280 | |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 281 | return policy; |
| 282 | } |
| 283 | |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 284 | /* Slow path of a mpol destructor. */ |
| 285 | void __mpol_put(struct mempolicy *p) |
| 286 | { |
| 287 | if (!atomic_dec_and_test(&p->refcnt)) |
| 288 | return; |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 289 | kmem_cache_free(policy_cache, p); |
| 290 | } |
| 291 | |
Miao Xie | 708c1bb | 2010-05-24 14:32:07 -0700 | [diff] [blame] | 292 | static void mpol_rebind_default(struct mempolicy *pol, const nodemask_t *nodes, |
| 293 | enum mpol_rebind_step step) |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 294 | { |
| 295 | } |
| 296 | |
Miao Xie | 708c1bb | 2010-05-24 14:32:07 -0700 | [diff] [blame] | 297 | /* |
| 298 | * step: |
| 299 | * MPOL_REBIND_ONCE - do rebind work at once |
| 300 | * MPOL_REBIND_STEP1 - set all the newly nodes |
| 301 | * MPOL_REBIND_STEP2 - clean all the disallowed nodes |
| 302 | */ |
| 303 | static void mpol_rebind_nodemask(struct mempolicy *pol, const nodemask_t *nodes, |
| 304 | enum mpol_rebind_step step) |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 305 | { |
| 306 | nodemask_t tmp; |
| 307 | |
| 308 | if (pol->flags & MPOL_F_STATIC_NODES) |
| 309 | nodes_and(tmp, pol->w.user_nodemask, *nodes); |
| 310 | else if (pol->flags & MPOL_F_RELATIVE_NODES) |
| 311 | mpol_relative_nodemask(&tmp, &pol->w.user_nodemask, nodes); |
| 312 | else { |
Miao Xie | 708c1bb | 2010-05-24 14:32:07 -0700 | [diff] [blame] | 313 | /* |
| 314 | * if step == 1, we use ->w.cpuset_mems_allowed to cache the |
| 315 | * result |
| 316 | */ |
| 317 | if (step == MPOL_REBIND_ONCE || step == MPOL_REBIND_STEP1) { |
| 318 | nodes_remap(tmp, pol->v.nodes, |
| 319 | pol->w.cpuset_mems_allowed, *nodes); |
| 320 | pol->w.cpuset_mems_allowed = step ? tmp : *nodes; |
| 321 | } else if (step == MPOL_REBIND_STEP2) { |
| 322 | tmp = pol->w.cpuset_mems_allowed; |
| 323 | pol->w.cpuset_mems_allowed = *nodes; |
| 324 | } else |
| 325 | BUG(); |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 326 | } |
| 327 | |
Miao Xie | 708c1bb | 2010-05-24 14:32:07 -0700 | [diff] [blame] | 328 | if (nodes_empty(tmp)) |
| 329 | tmp = *nodes; |
| 330 | |
| 331 | if (step == MPOL_REBIND_STEP1) |
| 332 | nodes_or(pol->v.nodes, pol->v.nodes, tmp); |
| 333 | else if (step == MPOL_REBIND_ONCE || step == MPOL_REBIND_STEP2) |
| 334 | pol->v.nodes = tmp; |
| 335 | else |
| 336 | BUG(); |
| 337 | |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 338 | if (!node_isset(current->il_next, tmp)) { |
| 339 | current->il_next = next_node(current->il_next, tmp); |
| 340 | if (current->il_next >= MAX_NUMNODES) |
| 341 | current->il_next = first_node(tmp); |
| 342 | if (current->il_next >= MAX_NUMNODES) |
| 343 | current->il_next = numa_node_id(); |
| 344 | } |
| 345 | } |
| 346 | |
| 347 | static void mpol_rebind_preferred(struct mempolicy *pol, |
Miao Xie | 708c1bb | 2010-05-24 14:32:07 -0700 | [diff] [blame] | 348 | const nodemask_t *nodes, |
| 349 | enum mpol_rebind_step step) |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 350 | { |
| 351 | nodemask_t tmp; |
| 352 | |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 353 | if (pol->flags & MPOL_F_STATIC_NODES) { |
| 354 | int node = first_node(pol->w.user_nodemask); |
| 355 | |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 356 | if (node_isset(node, *nodes)) { |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 357 | pol->v.preferred_node = node; |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 358 | pol->flags &= ~MPOL_F_LOCAL; |
| 359 | } else |
| 360 | pol->flags |= MPOL_F_LOCAL; |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 361 | } else if (pol->flags & MPOL_F_RELATIVE_NODES) { |
| 362 | mpol_relative_nodemask(&tmp, &pol->w.user_nodemask, nodes); |
| 363 | pol->v.preferred_node = first_node(tmp); |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 364 | } else if (!(pol->flags & MPOL_F_LOCAL)) { |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 365 | pol->v.preferred_node = node_remap(pol->v.preferred_node, |
| 366 | pol->w.cpuset_mems_allowed, |
| 367 | *nodes); |
| 368 | pol->w.cpuset_mems_allowed = *nodes; |
| 369 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | } |
| 371 | |
Miao Xie | 708c1bb | 2010-05-24 14:32:07 -0700 | [diff] [blame] | 372 | /* |
| 373 | * mpol_rebind_policy - Migrate a policy to a different set of nodes |
| 374 | * |
| 375 | * If read-side task has no lock to protect task->mempolicy, write-side |
| 376 | * task will rebind the task->mempolicy by two step. The first step is |
| 377 | * setting all the newly nodes, and the second step is cleaning all the |
| 378 | * disallowed nodes. In this way, we can avoid finding no node to alloc |
| 379 | * page. |
| 380 | * If we have a lock to protect task->mempolicy in read-side, we do |
| 381 | * rebind directly. |
| 382 | * |
| 383 | * step: |
| 384 | * MPOL_REBIND_ONCE - do rebind work at once |
| 385 | * MPOL_REBIND_STEP1 - set all the newly nodes |
| 386 | * MPOL_REBIND_STEP2 - clean all the disallowed nodes |
| 387 | */ |
| 388 | static void mpol_rebind_policy(struct mempolicy *pol, const nodemask_t *newmask, |
| 389 | enum mpol_rebind_step step) |
David Rientjes | 1d0d268 | 2008-04-28 02:12:32 -0700 | [diff] [blame] | 390 | { |
David Rientjes | 1d0d268 | 2008-04-28 02:12:32 -0700 | [diff] [blame] | 391 | if (!pol) |
| 392 | return; |
Miao Xie | 708c1bb | 2010-05-24 14:32:07 -0700 | [diff] [blame] | 393 | if (!mpol_store_user_nodemask(pol) && step == 0 && |
David Rientjes | 1d0d268 | 2008-04-28 02:12:32 -0700 | [diff] [blame] | 394 | nodes_equal(pol->w.cpuset_mems_allowed, *newmask)) |
| 395 | return; |
Miao Xie | 708c1bb | 2010-05-24 14:32:07 -0700 | [diff] [blame] | 396 | |
| 397 | if (step == MPOL_REBIND_STEP1 && (pol->flags & MPOL_F_REBINDING)) |
| 398 | return; |
| 399 | |
| 400 | if (step == MPOL_REBIND_STEP2 && !(pol->flags & MPOL_F_REBINDING)) |
| 401 | BUG(); |
| 402 | |
| 403 | if (step == MPOL_REBIND_STEP1) |
| 404 | pol->flags |= MPOL_F_REBINDING; |
| 405 | else if (step == MPOL_REBIND_STEP2) |
| 406 | pol->flags &= ~MPOL_F_REBINDING; |
| 407 | else if (step >= MPOL_REBIND_NSTEP) |
| 408 | BUG(); |
| 409 | |
| 410 | mpol_ops[pol->mode].rebind(pol, newmask, step); |
David Rientjes | 1d0d268 | 2008-04-28 02:12:32 -0700 | [diff] [blame] | 411 | } |
| 412 | |
| 413 | /* |
| 414 | * Wrapper for mpol_rebind_policy() that just requires task |
| 415 | * pointer, and updates task mempolicy. |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 416 | * |
| 417 | * Called with task's alloc_lock held. |
David Rientjes | 1d0d268 | 2008-04-28 02:12:32 -0700 | [diff] [blame] | 418 | */ |
| 419 | |
Miao Xie | 708c1bb | 2010-05-24 14:32:07 -0700 | [diff] [blame] | 420 | void mpol_rebind_task(struct task_struct *tsk, const nodemask_t *new, |
| 421 | enum mpol_rebind_step step) |
David Rientjes | 1d0d268 | 2008-04-28 02:12:32 -0700 | [diff] [blame] | 422 | { |
Miao Xie | 708c1bb | 2010-05-24 14:32:07 -0700 | [diff] [blame] | 423 | mpol_rebind_policy(tsk->mempolicy, new, step); |
David Rientjes | 1d0d268 | 2008-04-28 02:12:32 -0700 | [diff] [blame] | 424 | } |
| 425 | |
| 426 | /* |
| 427 | * Rebind each vma in mm to new nodemask. |
| 428 | * |
| 429 | * Call holding a reference to mm. Takes mm->mmap_sem during call. |
| 430 | */ |
| 431 | |
| 432 | void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new) |
| 433 | { |
| 434 | struct vm_area_struct *vma; |
| 435 | |
| 436 | down_write(&mm->mmap_sem); |
| 437 | for (vma = mm->mmap; vma; vma = vma->vm_next) |
Miao Xie | 708c1bb | 2010-05-24 14:32:07 -0700 | [diff] [blame] | 438 | mpol_rebind_policy(vma->vm_policy, new, MPOL_REBIND_ONCE); |
David Rientjes | 1d0d268 | 2008-04-28 02:12:32 -0700 | [diff] [blame] | 439 | up_write(&mm->mmap_sem); |
| 440 | } |
| 441 | |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 442 | static const struct mempolicy_operations mpol_ops[MPOL_MAX] = { |
| 443 | [MPOL_DEFAULT] = { |
| 444 | .rebind = mpol_rebind_default, |
| 445 | }, |
| 446 | [MPOL_INTERLEAVE] = { |
| 447 | .create = mpol_new_interleave, |
| 448 | .rebind = mpol_rebind_nodemask, |
| 449 | }, |
| 450 | [MPOL_PREFERRED] = { |
| 451 | .create = mpol_new_preferred, |
| 452 | .rebind = mpol_rebind_preferred, |
| 453 | }, |
| 454 | [MPOL_BIND] = { |
| 455 | .create = mpol_new_bind, |
| 456 | .rebind = mpol_rebind_nodemask, |
| 457 | }, |
| 458 | }; |
| 459 | |
Christoph Lameter | fc30128 | 2006-01-18 17:42:29 -0800 | [diff] [blame] | 460 | static void migrate_page_add(struct page *page, struct list_head *pagelist, |
| 461 | unsigned long flags); |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 462 | |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 463 | /* Scan through pages checking if pages follow certain conditions. */ |
Nick Piggin | b581003 | 2005-10-29 18:16:12 -0700 | [diff] [blame] | 464 | static int check_pte_range(struct vm_area_struct *vma, pmd_t *pmd, |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 465 | unsigned long addr, unsigned long end, |
| 466 | const nodemask_t *nodes, unsigned long flags, |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 467 | void *private) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | { |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 469 | pte_t *orig_pte; |
| 470 | pte_t *pte; |
Hugh Dickins | 705e87c | 2005-10-29 18:16:27 -0700 | [diff] [blame] | 471 | spinlock_t *ptl; |
Hugh Dickins | 941150a | 2005-06-21 17:15:06 -0700 | [diff] [blame] | 472 | |
Hugh Dickins | 705e87c | 2005-10-29 18:16:27 -0700 | [diff] [blame] | 473 | orig_pte = pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 474 | do { |
Linus Torvalds | 6aab341 | 2005-11-28 14:34:23 -0800 | [diff] [blame] | 475 | struct page *page; |
Andy Whitcroft | 25ba77c | 2006-12-06 20:33:03 -0800 | [diff] [blame] | 476 | int nid; |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 477 | |
| 478 | if (!pte_present(*pte)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | continue; |
Linus Torvalds | 6aab341 | 2005-11-28 14:34:23 -0800 | [diff] [blame] | 480 | page = vm_normal_page(vma, addr, *pte); |
| 481 | if (!page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | continue; |
Nick Piggin | 053837f | 2006-01-18 17:42:27 -0800 | [diff] [blame] | 483 | /* |
Hugh Dickins | 62b61f6 | 2009-12-14 17:59:33 -0800 | [diff] [blame] | 484 | * vm_normal_page() filters out zero pages, but there might |
| 485 | * still be PageReserved pages to skip, perhaps in a VDSO. |
| 486 | * And we cannot move PageKsm pages sensibly or safely yet. |
Nick Piggin | 053837f | 2006-01-18 17:42:27 -0800 | [diff] [blame] | 487 | */ |
Hugh Dickins | 62b61f6 | 2009-12-14 17:59:33 -0800 | [diff] [blame] | 488 | if (PageReserved(page) || PageKsm(page)) |
Christoph Lameter | f4598c8 | 2006-01-12 01:05:20 -0800 | [diff] [blame] | 489 | continue; |
Linus Torvalds | 6aab341 | 2005-11-28 14:34:23 -0800 | [diff] [blame] | 490 | nid = page_to_nid(page); |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 491 | if (node_isset(nid, *nodes) == !!(flags & MPOL_MF_INVERT)) |
| 492 | continue; |
| 493 | |
Stephen Wilson | b1f72d1 | 2011-05-24 17:12:43 -0700 | [diff] [blame] | 494 | if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) |
Christoph Lameter | fc30128 | 2006-01-18 17:42:29 -0800 | [diff] [blame] | 495 | migrate_page_add(page, private, flags); |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 496 | else |
| 497 | break; |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 498 | } while (pte++, addr += PAGE_SIZE, addr != end); |
Hugh Dickins | 705e87c | 2005-10-29 18:16:27 -0700 | [diff] [blame] | 499 | pte_unmap_unlock(orig_pte, ptl); |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 500 | return addr != end; |
| 501 | } |
| 502 | |
Nick Piggin | b581003 | 2005-10-29 18:16:12 -0700 | [diff] [blame] | 503 | static inline int check_pmd_range(struct vm_area_struct *vma, pud_t *pud, |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 504 | unsigned long addr, unsigned long end, |
| 505 | const nodemask_t *nodes, unsigned long flags, |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 506 | void *private) |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 507 | { |
| 508 | pmd_t *pmd; |
| 509 | unsigned long next; |
| 510 | |
| 511 | pmd = pmd_offset(pud, addr); |
| 512 | do { |
| 513 | next = pmd_addr_end(addr, end); |
Andrea Arcangeli | bae9c19 | 2011-01-13 15:46:46 -0800 | [diff] [blame] | 514 | split_huge_page_pmd(vma->vm_mm, pmd); |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 515 | if (pmd_none_or_clear_bad(pmd)) |
| 516 | continue; |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 517 | if (check_pte_range(vma, pmd, addr, next, nodes, |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 518 | flags, private)) |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 519 | return -EIO; |
| 520 | } while (pmd++, addr = next, addr != end); |
| 521 | return 0; |
| 522 | } |
| 523 | |
Nick Piggin | b581003 | 2005-10-29 18:16:12 -0700 | [diff] [blame] | 524 | static inline int check_pud_range(struct vm_area_struct *vma, pgd_t *pgd, |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 525 | unsigned long addr, unsigned long end, |
| 526 | const nodemask_t *nodes, unsigned long flags, |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 527 | void *private) |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 528 | { |
| 529 | pud_t *pud; |
| 530 | unsigned long next; |
| 531 | |
| 532 | pud = pud_offset(pgd, addr); |
| 533 | do { |
| 534 | next = pud_addr_end(addr, end); |
| 535 | if (pud_none_or_clear_bad(pud)) |
| 536 | continue; |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 537 | if (check_pmd_range(vma, pud, addr, next, nodes, |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 538 | flags, private)) |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 539 | return -EIO; |
| 540 | } while (pud++, addr = next, addr != end); |
| 541 | return 0; |
| 542 | } |
| 543 | |
Nick Piggin | b581003 | 2005-10-29 18:16:12 -0700 | [diff] [blame] | 544 | static inline int check_pgd_range(struct vm_area_struct *vma, |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 545 | unsigned long addr, unsigned long end, |
| 546 | const nodemask_t *nodes, unsigned long flags, |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 547 | void *private) |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 548 | { |
| 549 | pgd_t *pgd; |
| 550 | unsigned long next; |
| 551 | |
Nick Piggin | b581003 | 2005-10-29 18:16:12 -0700 | [diff] [blame] | 552 | pgd = pgd_offset(vma->vm_mm, addr); |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 553 | do { |
| 554 | next = pgd_addr_end(addr, end); |
| 555 | if (pgd_none_or_clear_bad(pgd)) |
| 556 | continue; |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 557 | if (check_pud_range(vma, pgd, addr, next, nodes, |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 558 | flags, private)) |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 559 | return -EIO; |
| 560 | } while (pgd++, addr = next, addr != end); |
| 561 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | } |
| 563 | |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 564 | /* |
| 565 | * Check if all pages in a range are on a set of nodes. |
| 566 | * If pagelist != NULL then isolate pages from the LRU and |
| 567 | * put them on the pagelist. |
| 568 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | static struct vm_area_struct * |
| 570 | check_range(struct mm_struct *mm, unsigned long start, unsigned long end, |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 571 | const nodemask_t *nodes, unsigned long flags, void *private) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | { |
| 573 | int err; |
| 574 | struct vm_area_struct *first, *vma, *prev; |
| 575 | |
Nick Piggin | 053837f | 2006-01-18 17:42:27 -0800 | [diff] [blame] | 576 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | first = find_vma(mm, start); |
| 578 | if (!first) |
| 579 | return ERR_PTR(-EFAULT); |
| 580 | prev = NULL; |
| 581 | for (vma = first; vma && vma->vm_start < end; vma = vma->vm_next) { |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 582 | if (!(flags & MPOL_MF_DISCONTIG_OK)) { |
| 583 | if (!vma->vm_next && vma->vm_end < end) |
| 584 | return ERR_PTR(-EFAULT); |
| 585 | if (prev && prev->vm_end < vma->vm_start) |
| 586 | return ERR_PTR(-EFAULT); |
| 587 | } |
| 588 | if (!is_vm_hugetlb_page(vma) && |
| 589 | ((flags & MPOL_MF_STRICT) || |
| 590 | ((flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) && |
| 591 | vma_migratable(vma)))) { |
Andi Kleen | 5b952b3 | 2005-09-13 01:25:08 -0700 | [diff] [blame] | 592 | unsigned long endvma = vma->vm_end; |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 593 | |
Andi Kleen | 5b952b3 | 2005-09-13 01:25:08 -0700 | [diff] [blame] | 594 | if (endvma > end) |
| 595 | endvma = end; |
| 596 | if (vma->vm_start > start) |
| 597 | start = vma->vm_start; |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 598 | err = check_pgd_range(vma, start, endvma, nodes, |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 599 | flags, private); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | if (err) { |
| 601 | first = ERR_PTR(err); |
| 602 | break; |
| 603 | } |
| 604 | } |
| 605 | prev = vma; |
| 606 | } |
| 607 | return first; |
| 608 | } |
| 609 | |
| 610 | /* Apply policy to a single VMA */ |
| 611 | static int policy_vma(struct vm_area_struct *vma, struct mempolicy *new) |
| 612 | { |
| 613 | int err = 0; |
| 614 | struct mempolicy *old = vma->vm_policy; |
| 615 | |
Paul Mundt | 140d5a4 | 2007-07-15 23:38:16 -0700 | [diff] [blame] | 616 | pr_debug("vma %lx-%lx/%lx vm_ops %p vm_file %p set_policy %p\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | vma->vm_start, vma->vm_end, vma->vm_pgoff, |
| 618 | vma->vm_ops, vma->vm_file, |
| 619 | vma->vm_ops ? vma->vm_ops->set_policy : NULL); |
| 620 | |
| 621 | if (vma->vm_ops && vma->vm_ops->set_policy) |
| 622 | err = vma->vm_ops->set_policy(vma, new); |
| 623 | if (!err) { |
| 624 | mpol_get(new); |
| 625 | vma->vm_policy = new; |
Lee Schermerhorn | f0be3d3 | 2008-04-28 02:13:08 -0700 | [diff] [blame] | 626 | mpol_put(old); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | } |
| 628 | return err; |
| 629 | } |
| 630 | |
| 631 | /* Step 2: apply policy to a range and do splits. */ |
KOSAKI Motohiro | 9d8cebd | 2010-03-05 13:41:57 -0800 | [diff] [blame] | 632 | static int mbind_range(struct mm_struct *mm, unsigned long start, |
| 633 | unsigned long end, struct mempolicy *new_pol) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | { |
| 635 | struct vm_area_struct *next; |
KOSAKI Motohiro | 9d8cebd | 2010-03-05 13:41:57 -0800 | [diff] [blame] | 636 | struct vm_area_struct *prev; |
| 637 | struct vm_area_struct *vma; |
| 638 | int err = 0; |
KOSAKI Motohiro | e26a511 | 2011-12-28 15:57:11 -0800 | [diff] [blame] | 639 | pgoff_t pgoff; |
KOSAKI Motohiro | 9d8cebd | 2010-03-05 13:41:57 -0800 | [diff] [blame] | 640 | unsigned long vmstart; |
| 641 | unsigned long vmend; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | |
KOSAKI Motohiro | 9d8cebd | 2010-03-05 13:41:57 -0800 | [diff] [blame] | 643 | vma = find_vma_prev(mm, start, &prev); |
| 644 | if (!vma || vma->vm_start > start) |
| 645 | return -EFAULT; |
| 646 | |
KOSAKI Motohiro | e26a511 | 2011-12-28 15:57:11 -0800 | [diff] [blame] | 647 | if (start > vma->vm_start) |
| 648 | prev = vma; |
| 649 | |
KOSAKI Motohiro | 9d8cebd | 2010-03-05 13:41:57 -0800 | [diff] [blame] | 650 | for (; vma && vma->vm_start < end; prev = vma, vma = next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | next = vma->vm_next; |
KOSAKI Motohiro | 9d8cebd | 2010-03-05 13:41:57 -0800 | [diff] [blame] | 652 | vmstart = max(start, vma->vm_start); |
| 653 | vmend = min(end, vma->vm_end); |
| 654 | |
KOSAKI Motohiro | e26a511 | 2011-12-28 15:57:11 -0800 | [diff] [blame] | 655 | if (mpol_equal(vma_policy(vma), new_pol)) |
| 656 | continue; |
| 657 | |
| 658 | pgoff = vma->vm_pgoff + |
| 659 | ((vmstart - vma->vm_start) >> PAGE_SHIFT); |
KOSAKI Motohiro | 9d8cebd | 2010-03-05 13:41:57 -0800 | [diff] [blame] | 660 | prev = vma_merge(mm, prev, vmstart, vmend, vma->vm_flags, |
KOSAKI Motohiro | e26a511 | 2011-12-28 15:57:11 -0800 | [diff] [blame] | 661 | vma->anon_vma, vma->vm_file, pgoff, |
Caspar Zhang | 8aacc9f | 2011-09-14 16:20:58 -0700 | [diff] [blame] | 662 | new_pol); |
KOSAKI Motohiro | 9d8cebd | 2010-03-05 13:41:57 -0800 | [diff] [blame] | 663 | if (prev) { |
| 664 | vma = prev; |
| 665 | next = vma->vm_next; |
| 666 | continue; |
| 667 | } |
| 668 | if (vma->vm_start != vmstart) { |
| 669 | err = split_vma(vma->vm_mm, vma, vmstart, 1); |
| 670 | if (err) |
| 671 | goto out; |
| 672 | } |
| 673 | if (vma->vm_end != vmend) { |
| 674 | err = split_vma(vma->vm_mm, vma, vmend, 0); |
| 675 | if (err) |
| 676 | goto out; |
| 677 | } |
| 678 | err = policy_vma(vma, new_pol); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | if (err) |
KOSAKI Motohiro | 9d8cebd | 2010-03-05 13:41:57 -0800 | [diff] [blame] | 680 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | } |
KOSAKI Motohiro | 9d8cebd | 2010-03-05 13:41:57 -0800 | [diff] [blame] | 682 | |
| 683 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | return err; |
| 685 | } |
| 686 | |
Paul Jackson | c61afb1 | 2006-03-24 03:16:08 -0800 | [diff] [blame] | 687 | /* |
| 688 | * Update task->flags PF_MEMPOLICY bit: set iff non-default |
| 689 | * mempolicy. Allows more rapid checking of this (combined perhaps |
| 690 | * with other PF_* flag bits) on memory allocation hot code paths. |
| 691 | * |
| 692 | * If called from outside this file, the task 'p' should -only- be |
| 693 | * a newly forked child not yet visible on the task list, because |
| 694 | * manipulating the task flags of a visible task is not safe. |
| 695 | * |
| 696 | * The above limitation is why this routine has the funny name |
| 697 | * mpol_fix_fork_child_flag(). |
| 698 | * |
| 699 | * It is also safe to call this with a task pointer of current, |
| 700 | * which the static wrapper mpol_set_task_struct_flag() does, |
| 701 | * for use within this file. |
| 702 | */ |
| 703 | |
| 704 | void mpol_fix_fork_child_flag(struct task_struct *p) |
| 705 | { |
| 706 | if (p->mempolicy) |
| 707 | p->flags |= PF_MEMPOLICY; |
| 708 | else |
| 709 | p->flags &= ~PF_MEMPOLICY; |
| 710 | } |
| 711 | |
| 712 | static void mpol_set_task_struct_flag(void) |
| 713 | { |
| 714 | mpol_fix_fork_child_flag(current); |
| 715 | } |
| 716 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | /* Set the process memory policy */ |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 718 | static long do_set_mempolicy(unsigned short mode, unsigned short flags, |
| 719 | nodemask_t *nodes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | { |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 721 | struct mempolicy *new, *old; |
Lee Schermerhorn | f4e53d9 | 2008-04-28 02:13:10 -0700 | [diff] [blame] | 722 | struct mm_struct *mm = current->mm; |
KAMEZAWA Hiroyuki | 4bfc449 | 2009-08-06 15:07:33 -0700 | [diff] [blame] | 723 | NODEMASK_SCRATCH(scratch); |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 724 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | |
KAMEZAWA Hiroyuki | 4bfc449 | 2009-08-06 15:07:33 -0700 | [diff] [blame] | 726 | if (!scratch) |
| 727 | return -ENOMEM; |
Lee Schermerhorn | f4e53d9 | 2008-04-28 02:13:10 -0700 | [diff] [blame] | 728 | |
KAMEZAWA Hiroyuki | 4bfc449 | 2009-08-06 15:07:33 -0700 | [diff] [blame] | 729 | new = mpol_new(mode, flags, nodes); |
| 730 | if (IS_ERR(new)) { |
| 731 | ret = PTR_ERR(new); |
| 732 | goto out; |
| 733 | } |
Lee Schermerhorn | f4e53d9 | 2008-04-28 02:13:10 -0700 | [diff] [blame] | 734 | /* |
| 735 | * prevent changing our mempolicy while show_numa_maps() |
| 736 | * is using it. |
| 737 | * Note: do_set_mempolicy() can be called at init time |
| 738 | * with no 'mm'. |
| 739 | */ |
| 740 | if (mm) |
| 741 | down_write(&mm->mmap_sem); |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 742 | task_lock(current); |
KAMEZAWA Hiroyuki | 4bfc449 | 2009-08-06 15:07:33 -0700 | [diff] [blame] | 743 | ret = mpol_set_nodemask(new, nodes, scratch); |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 744 | if (ret) { |
| 745 | task_unlock(current); |
| 746 | if (mm) |
| 747 | up_write(&mm->mmap_sem); |
| 748 | mpol_put(new); |
KAMEZAWA Hiroyuki | 4bfc449 | 2009-08-06 15:07:33 -0700 | [diff] [blame] | 749 | goto out; |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 750 | } |
| 751 | old = current->mempolicy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | current->mempolicy = new; |
Paul Jackson | c61afb1 | 2006-03-24 03:16:08 -0800 | [diff] [blame] | 753 | mpol_set_task_struct_flag(); |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 754 | if (new && new->mode == MPOL_INTERLEAVE && |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 755 | nodes_weight(new->v.nodes)) |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 756 | current->il_next = first_node(new->v.nodes); |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 757 | task_unlock(current); |
Lee Schermerhorn | f4e53d9 | 2008-04-28 02:13:10 -0700 | [diff] [blame] | 758 | if (mm) |
| 759 | up_write(&mm->mmap_sem); |
| 760 | |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 761 | mpol_put(old); |
KAMEZAWA Hiroyuki | 4bfc449 | 2009-08-06 15:07:33 -0700 | [diff] [blame] | 762 | ret = 0; |
| 763 | out: |
| 764 | NODEMASK_SCRATCH_FREE(scratch); |
| 765 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | } |
| 767 | |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 768 | /* |
| 769 | * Return nodemask for policy for get_mempolicy() query |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 770 | * |
| 771 | * Called with task's alloc_lock held |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 772 | */ |
| 773 | static void get_policy_nodemask(struct mempolicy *p, nodemask_t *nodes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | { |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 775 | nodes_clear(*nodes); |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 776 | if (p == &default_policy) |
| 777 | return; |
| 778 | |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 779 | switch (p->mode) { |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 780 | case MPOL_BIND: |
| 781 | /* Fall through */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | case MPOL_INTERLEAVE: |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 783 | *nodes = p->v.nodes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | break; |
| 785 | case MPOL_PREFERRED: |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 786 | if (!(p->flags & MPOL_F_LOCAL)) |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 787 | node_set(p->v.preferred_node, *nodes); |
Lee Schermerhorn | 53f2556 | 2008-04-28 02:13:20 -0700 | [diff] [blame] | 788 | /* else return empty node mask for local allocation */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | break; |
| 790 | default: |
| 791 | BUG(); |
| 792 | } |
| 793 | } |
| 794 | |
| 795 | static int lookup_node(struct mm_struct *mm, unsigned long addr) |
| 796 | { |
| 797 | struct page *p; |
| 798 | int err; |
| 799 | |
| 800 | err = get_user_pages(current, mm, addr & PAGE_MASK, 1, 0, 0, &p, NULL); |
| 801 | if (err >= 0) { |
| 802 | err = page_to_nid(p); |
| 803 | put_page(p); |
| 804 | } |
| 805 | return err; |
| 806 | } |
| 807 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | /* Retrieve NUMA policy */ |
Adrian Bunk | dbcb0f1 | 2007-10-16 01:26:26 -0700 | [diff] [blame] | 809 | static long do_get_mempolicy(int *policy, nodemask_t *nmask, |
| 810 | unsigned long addr, unsigned long flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | { |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 812 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | struct mm_struct *mm = current->mm; |
| 814 | struct vm_area_struct *vma = NULL; |
| 815 | struct mempolicy *pol = current->mempolicy; |
| 816 | |
Lee Schermerhorn | 754af6f | 2007-10-16 01:24:51 -0700 | [diff] [blame] | 817 | if (flags & |
| 818 | ~(unsigned long)(MPOL_F_NODE|MPOL_F_ADDR|MPOL_F_MEMS_ALLOWED)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | return -EINVAL; |
Lee Schermerhorn | 754af6f | 2007-10-16 01:24:51 -0700 | [diff] [blame] | 820 | |
| 821 | if (flags & MPOL_F_MEMS_ALLOWED) { |
| 822 | if (flags & (MPOL_F_NODE|MPOL_F_ADDR)) |
| 823 | return -EINVAL; |
| 824 | *policy = 0; /* just so it's initialized */ |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 825 | task_lock(current); |
Lee Schermerhorn | 754af6f | 2007-10-16 01:24:51 -0700 | [diff] [blame] | 826 | *nmask = cpuset_current_mems_allowed; |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 827 | task_unlock(current); |
Lee Schermerhorn | 754af6f | 2007-10-16 01:24:51 -0700 | [diff] [blame] | 828 | return 0; |
| 829 | } |
| 830 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | if (flags & MPOL_F_ADDR) { |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 832 | /* |
| 833 | * Do NOT fall back to task policy if the |
| 834 | * vma/shared policy at addr is NULL. We |
| 835 | * want to return MPOL_DEFAULT in this case. |
| 836 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | down_read(&mm->mmap_sem); |
| 838 | vma = find_vma_intersection(mm, addr, addr+1); |
| 839 | if (!vma) { |
| 840 | up_read(&mm->mmap_sem); |
| 841 | return -EFAULT; |
| 842 | } |
| 843 | if (vma->vm_ops && vma->vm_ops->get_policy) |
| 844 | pol = vma->vm_ops->get_policy(vma, addr); |
| 845 | else |
| 846 | pol = vma->vm_policy; |
| 847 | } else if (addr) |
| 848 | return -EINVAL; |
| 849 | |
| 850 | if (!pol) |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 851 | pol = &default_policy; /* indicates default behavior */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | |
| 853 | if (flags & MPOL_F_NODE) { |
| 854 | if (flags & MPOL_F_ADDR) { |
| 855 | err = lookup_node(mm, addr); |
| 856 | if (err < 0) |
| 857 | goto out; |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 858 | *policy = err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | } else if (pol == current->mempolicy && |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 860 | pol->mode == MPOL_INTERLEAVE) { |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 861 | *policy = current->il_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | } else { |
| 863 | err = -EINVAL; |
| 864 | goto out; |
| 865 | } |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 866 | } else { |
| 867 | *policy = pol == &default_policy ? MPOL_DEFAULT : |
| 868 | pol->mode; |
David Rientjes | d79df63 | 2008-07-04 12:24:13 -0700 | [diff] [blame] | 869 | /* |
| 870 | * Internal mempolicy flags must be masked off before exposing |
| 871 | * the policy to userspace. |
| 872 | */ |
| 873 | *policy |= (pol->flags & MPOL_MODE_FLAGS); |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 874 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | |
| 876 | if (vma) { |
| 877 | up_read(¤t->mm->mmap_sem); |
| 878 | vma = NULL; |
| 879 | } |
| 880 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | err = 0; |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 882 | if (nmask) { |
Lee Schermerhorn | c6b6ef8 | 2010-03-23 13:35:41 -0700 | [diff] [blame] | 883 | if (mpol_store_user_nodemask(pol)) { |
| 884 | *nmask = pol->w.user_nodemask; |
| 885 | } else { |
| 886 | task_lock(current); |
| 887 | get_policy_nodemask(pol, nmask); |
| 888 | task_unlock(current); |
| 889 | } |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 890 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | |
| 892 | out: |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 893 | mpol_cond_put(pol); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | if (vma) |
| 895 | up_read(¤t->mm->mmap_sem); |
| 896 | return err; |
| 897 | } |
| 898 | |
Christoph Lameter | b20a350 | 2006-03-22 00:09:12 -0800 | [diff] [blame] | 899 | #ifdef CONFIG_MIGRATION |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 900 | /* |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 901 | * page migration |
| 902 | */ |
Christoph Lameter | fc30128 | 2006-01-18 17:42:29 -0800 | [diff] [blame] | 903 | static void migrate_page_add(struct page *page, struct list_head *pagelist, |
| 904 | unsigned long flags) |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 905 | { |
| 906 | /* |
Christoph Lameter | fc30128 | 2006-01-18 17:42:29 -0800 | [diff] [blame] | 907 | * Avoid migrating a page that is shared with others. |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 908 | */ |
Nick Piggin | 62695a8 | 2008-10-18 20:26:09 -0700 | [diff] [blame] | 909 | if ((flags & MPOL_MF_MOVE_ALL) || page_mapcount(page) == 1) { |
| 910 | if (!isolate_lru_page(page)) { |
| 911 | list_add_tail(&page->lru, pagelist); |
KOSAKI Motohiro | 6d9c285 | 2009-12-14 17:58:11 -0800 | [diff] [blame] | 912 | inc_zone_page_state(page, NR_ISOLATED_ANON + |
| 913 | page_is_file_cache(page)); |
Nick Piggin | 62695a8 | 2008-10-18 20:26:09 -0700 | [diff] [blame] | 914 | } |
| 915 | } |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 916 | } |
| 917 | |
Christoph Lameter | 742755a | 2006-06-23 02:03:55 -0700 | [diff] [blame] | 918 | 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] | 919 | { |
Mel Gorman | 6484eb3 | 2009-06-16 15:31:54 -0700 | [diff] [blame] | 920 | return alloc_pages_exact_node(node, GFP_HIGHUSER_MOVABLE, 0); |
Christoph Lameter | 95a402c | 2006-06-23 02:03:53 -0700 | [diff] [blame] | 921 | } |
| 922 | |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 923 | /* |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 924 | * Migrate pages from one node to a target node. |
| 925 | * Returns error or the number of pages not migrated. |
| 926 | */ |
Adrian Bunk | dbcb0f1 | 2007-10-16 01:26:26 -0700 | [diff] [blame] | 927 | static int migrate_to_node(struct mm_struct *mm, int source, int dest, |
| 928 | int flags) |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 929 | { |
| 930 | nodemask_t nmask; |
| 931 | LIST_HEAD(pagelist); |
| 932 | int err = 0; |
Vasiliy Kulikov | 0def08e | 2010-10-26 14:21:32 -0700 | [diff] [blame] | 933 | struct vm_area_struct *vma; |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 934 | |
| 935 | nodes_clear(nmask); |
| 936 | node_set(source, nmask); |
| 937 | |
Vasiliy Kulikov | 0def08e | 2010-10-26 14:21:32 -0700 | [diff] [blame] | 938 | vma = check_range(mm, mm->mmap->vm_start, mm->task_size, &nmask, |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 939 | flags | MPOL_MF_DISCONTIG_OK, &pagelist); |
Vasiliy Kulikov | 0def08e | 2010-10-26 14:21:32 -0700 | [diff] [blame] | 940 | if (IS_ERR(vma)) |
| 941 | return PTR_ERR(vma); |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 942 | |
Minchan Kim | cf608ac | 2010-10-26 14:21:29 -0700 | [diff] [blame] | 943 | if (!list_empty(&pagelist)) { |
Mel Gorman | 7f0f249 | 2011-01-13 15:45:58 -0800 | [diff] [blame] | 944 | err = migrate_pages(&pagelist, new_node_page, dest, |
Mel Gorman | a6bc32b | 2012-01-12 17:19:43 -0800 | [diff] [blame] | 945 | false, MIGRATE_SYNC); |
Minchan Kim | cf608ac | 2010-10-26 14:21:29 -0700 | [diff] [blame] | 946 | if (err) |
| 947 | putback_lru_pages(&pagelist); |
| 948 | } |
Christoph Lameter | 95a402c | 2006-06-23 02:03:53 -0700 | [diff] [blame] | 949 | |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 950 | return err; |
| 951 | } |
| 952 | |
| 953 | /* |
| 954 | * Move pages between the two nodesets so as to preserve the physical |
| 955 | * layout as much as possible. |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 956 | * |
| 957 | * Returns the number of page that could not be moved. |
| 958 | */ |
| 959 | int do_migrate_pages(struct mm_struct *mm, |
| 960 | const nodemask_t *from_nodes, const nodemask_t *to_nodes, int flags) |
| 961 | { |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 962 | int busy = 0; |
Christoph Lameter | 0aedadf | 2008-11-06 12:53:30 -0800 | [diff] [blame] | 963 | int err; |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 964 | nodemask_t tmp; |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 965 | |
Christoph Lameter | 0aedadf | 2008-11-06 12:53:30 -0800 | [diff] [blame] | 966 | err = migrate_prep(); |
| 967 | if (err) |
| 968 | return err; |
| 969 | |
Lee Schermerhorn | 53f2556 | 2008-04-28 02:13:20 -0700 | [diff] [blame] | 970 | down_read(&mm->mmap_sem); |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 971 | |
Christoph Lameter | 7b2259b | 2006-06-25 05:46:48 -0700 | [diff] [blame] | 972 | err = migrate_vmas(mm, from_nodes, to_nodes, flags); |
| 973 | if (err) |
| 974 | goto out; |
| 975 | |
KOSAKI Motohiro | da0aa13 | 2010-03-05 13:41:59 -0800 | [diff] [blame] | 976 | /* |
| 977 | * Find a 'source' bit set in 'tmp' whose corresponding 'dest' |
| 978 | * bit in 'to' is not also set in 'tmp'. Clear the found 'source' |
| 979 | * bit in 'tmp', and return that <source, dest> pair for migration. |
| 980 | * The pair of nodemasks 'to' and 'from' define the map. |
| 981 | * |
| 982 | * If no pair of bits is found that way, fallback to picking some |
| 983 | * pair of 'source' and 'dest' bits that are not the same. If the |
| 984 | * 'source' and 'dest' bits are the same, this represents a node |
| 985 | * that will be migrating to itself, so no pages need move. |
| 986 | * |
| 987 | * If no bits are left in 'tmp', or if all remaining bits left |
| 988 | * in 'tmp' correspond to the same bit in 'to', return false |
| 989 | * (nothing left to migrate). |
| 990 | * |
| 991 | * This lets us pick a pair of nodes to migrate between, such that |
| 992 | * if possible the dest node is not already occupied by some other |
| 993 | * source node, minimizing the risk of overloading the memory on a |
| 994 | * node that would happen if we migrated incoming memory to a node |
| 995 | * before migrating outgoing memory source that same node. |
| 996 | * |
| 997 | * A single scan of tmp is sufficient. As we go, we remember the |
| 998 | * most recent <s, d> pair that moved (s != d). If we find a pair |
| 999 | * that not only moved, but what's better, moved to an empty slot |
| 1000 | * (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] | 1001 | * Otherwise when we finish scanning from_tmp, we at least have the |
KOSAKI Motohiro | da0aa13 | 2010-03-05 13:41:59 -0800 | [diff] [blame] | 1002 | * most recent <s, d> pair that moved. If we get all the way through |
| 1003 | * the scan of tmp without finding any node that moved, much less |
| 1004 | * moved to an empty node, then there is nothing left worth migrating. |
| 1005 | */ |
Christoph Lameter | d498471 | 2006-01-08 01:00:55 -0800 | [diff] [blame] | 1006 | |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 1007 | tmp = *from_nodes; |
| 1008 | while (!nodes_empty(tmp)) { |
| 1009 | int s,d; |
| 1010 | int source = -1; |
| 1011 | int dest = 0; |
| 1012 | |
| 1013 | for_each_node_mask(s, tmp) { |
| 1014 | d = node_remap(s, *from_nodes, *to_nodes); |
| 1015 | if (s == d) |
| 1016 | continue; |
| 1017 | |
| 1018 | source = s; /* Node moved. Memorize */ |
| 1019 | dest = d; |
| 1020 | |
| 1021 | /* dest not in remaining from nodes? */ |
| 1022 | if (!node_isset(dest, tmp)) |
| 1023 | break; |
| 1024 | } |
| 1025 | if (source == -1) |
| 1026 | break; |
| 1027 | |
| 1028 | node_clear(source, tmp); |
| 1029 | err = migrate_to_node(mm, source, dest, flags); |
| 1030 | if (err > 0) |
| 1031 | busy += err; |
| 1032 | if (err < 0) |
| 1033 | break; |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1034 | } |
Christoph Lameter | 7b2259b | 2006-06-25 05:46:48 -0700 | [diff] [blame] | 1035 | out: |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1036 | up_read(&mm->mmap_sem); |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 1037 | if (err < 0) |
| 1038 | return err; |
| 1039 | return busy; |
Christoph Lameter | b20a350 | 2006-03-22 00:09:12 -0800 | [diff] [blame] | 1040 | |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1041 | } |
| 1042 | |
Lee Schermerhorn | 3ad33b2 | 2007-11-14 16:59:10 -0800 | [diff] [blame] | 1043 | /* |
| 1044 | * Allocate a new page for page migration based on vma policy. |
| 1045 | * Start assuming that page is mapped by vma pointed to by @private. |
| 1046 | * Search forward from there, if not. N.B., this assumes that the |
| 1047 | * list of pages handed to migrate_pages()--which is how we get here-- |
| 1048 | * is in virtual address order. |
| 1049 | */ |
Christoph Lameter | 742755a | 2006-06-23 02:03:55 -0700 | [diff] [blame] | 1050 | static struct page *new_vma_page(struct page *page, unsigned long private, int **x) |
Christoph Lameter | 95a402c | 2006-06-23 02:03:53 -0700 | [diff] [blame] | 1051 | { |
| 1052 | struct vm_area_struct *vma = (struct vm_area_struct *)private; |
Lee Schermerhorn | 3ad33b2 | 2007-11-14 16:59:10 -0800 | [diff] [blame] | 1053 | unsigned long uninitialized_var(address); |
Christoph Lameter | 95a402c | 2006-06-23 02:03:53 -0700 | [diff] [blame] | 1054 | |
Lee Schermerhorn | 3ad33b2 | 2007-11-14 16:59:10 -0800 | [diff] [blame] | 1055 | while (vma) { |
| 1056 | address = page_address_in_vma(page, vma); |
| 1057 | if (address != -EFAULT) |
| 1058 | break; |
| 1059 | vma = vma->vm_next; |
| 1060 | } |
| 1061 | |
| 1062 | /* |
| 1063 | * if !vma, alloc_page_vma() will use task or system default policy |
| 1064 | */ |
| 1065 | return alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma, address); |
Christoph Lameter | 95a402c | 2006-06-23 02:03:53 -0700 | [diff] [blame] | 1066 | } |
Christoph Lameter | b20a350 | 2006-03-22 00:09:12 -0800 | [diff] [blame] | 1067 | #else |
| 1068 | |
| 1069 | static void migrate_page_add(struct page *page, struct list_head *pagelist, |
| 1070 | unsigned long flags) |
| 1071 | { |
| 1072 | } |
| 1073 | |
| 1074 | int do_migrate_pages(struct mm_struct *mm, |
| 1075 | const nodemask_t *from_nodes, const nodemask_t *to_nodes, int flags) |
| 1076 | { |
| 1077 | return -ENOSYS; |
| 1078 | } |
Christoph Lameter | 95a402c | 2006-06-23 02:03:53 -0700 | [diff] [blame] | 1079 | |
Keith Owens | 6993974 | 2006-10-11 01:21:28 -0700 | [diff] [blame] | 1080 | static struct page *new_vma_page(struct page *page, unsigned long private, int **x) |
Christoph Lameter | 95a402c | 2006-06-23 02:03:53 -0700 | [diff] [blame] | 1081 | { |
| 1082 | return NULL; |
| 1083 | } |
Christoph Lameter | b20a350 | 2006-03-22 00:09:12 -0800 | [diff] [blame] | 1084 | #endif |
| 1085 | |
Adrian Bunk | dbcb0f1 | 2007-10-16 01:26:26 -0700 | [diff] [blame] | 1086 | static long do_mbind(unsigned long start, unsigned long len, |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 1087 | unsigned short mode, unsigned short mode_flags, |
| 1088 | nodemask_t *nmask, unsigned long flags) |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 1089 | { |
| 1090 | struct vm_area_struct *vma; |
| 1091 | struct mm_struct *mm = current->mm; |
| 1092 | struct mempolicy *new; |
| 1093 | unsigned long end; |
| 1094 | int err; |
| 1095 | LIST_HEAD(pagelist); |
| 1096 | |
David Rientjes | a3b51e0 | 2008-04-28 02:12:23 -0700 | [diff] [blame] | 1097 | if (flags & ~(unsigned long)(MPOL_MF_STRICT | |
| 1098 | MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 1099 | return -EINVAL; |
Christoph Lameter | 74c0024 | 2006-03-14 19:50:21 -0800 | [diff] [blame] | 1100 | if ((flags & MPOL_MF_MOVE_ALL) && !capable(CAP_SYS_NICE)) |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 1101 | return -EPERM; |
| 1102 | |
| 1103 | if (start & ~PAGE_MASK) |
| 1104 | return -EINVAL; |
| 1105 | |
| 1106 | if (mode == MPOL_DEFAULT) |
| 1107 | flags &= ~MPOL_MF_STRICT; |
| 1108 | |
| 1109 | len = (len + PAGE_SIZE - 1) & PAGE_MASK; |
| 1110 | end = start + len; |
| 1111 | |
| 1112 | if (end < start) |
| 1113 | return -EINVAL; |
| 1114 | if (end == start) |
| 1115 | return 0; |
| 1116 | |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 1117 | new = mpol_new(mode, mode_flags, nmask); |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 1118 | if (IS_ERR(new)) |
| 1119 | return PTR_ERR(new); |
| 1120 | |
| 1121 | /* |
| 1122 | * If we are using the default policy then operation |
| 1123 | * on discontinuous address spaces is okay after all |
| 1124 | */ |
| 1125 | if (!new) |
| 1126 | flags |= MPOL_MF_DISCONTIG_OK; |
| 1127 | |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 1128 | pr_debug("mbind %lx-%lx mode:%d flags:%d nodes:%lx\n", |
| 1129 | start, start + len, mode, mode_flags, |
| 1130 | nmask ? nodes_addr(*nmask)[0] : -1); |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 1131 | |
Christoph Lameter | 0aedadf | 2008-11-06 12:53:30 -0800 | [diff] [blame] | 1132 | if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) { |
| 1133 | |
| 1134 | err = migrate_prep(); |
| 1135 | if (err) |
KOSAKI Motohiro | b05ca73 | 2009-10-26 16:49:59 -0700 | [diff] [blame] | 1136 | goto mpol_out; |
Christoph Lameter | 0aedadf | 2008-11-06 12:53:30 -0800 | [diff] [blame] | 1137 | } |
KAMEZAWA Hiroyuki | 4bfc449 | 2009-08-06 15:07:33 -0700 | [diff] [blame] | 1138 | { |
| 1139 | NODEMASK_SCRATCH(scratch); |
| 1140 | if (scratch) { |
| 1141 | down_write(&mm->mmap_sem); |
| 1142 | task_lock(current); |
| 1143 | err = mpol_set_nodemask(new, nmask, scratch); |
| 1144 | task_unlock(current); |
| 1145 | if (err) |
| 1146 | up_write(&mm->mmap_sem); |
| 1147 | } else |
| 1148 | err = -ENOMEM; |
| 1149 | NODEMASK_SCRATCH_FREE(scratch); |
| 1150 | } |
KOSAKI Motohiro | b05ca73 | 2009-10-26 16:49:59 -0700 | [diff] [blame] | 1151 | if (err) |
| 1152 | goto mpol_out; |
| 1153 | |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 1154 | vma = check_range(mm, start, end, nmask, |
| 1155 | flags | MPOL_MF_INVERT, &pagelist); |
| 1156 | |
| 1157 | err = PTR_ERR(vma); |
| 1158 | if (!IS_ERR(vma)) { |
| 1159 | int nr_failed = 0; |
| 1160 | |
KOSAKI Motohiro | 9d8cebd | 2010-03-05 13:41:57 -0800 | [diff] [blame] | 1161 | err = mbind_range(mm, start, end, new); |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 1162 | |
Minchan Kim | cf608ac | 2010-10-26 14:21:29 -0700 | [diff] [blame] | 1163 | if (!list_empty(&pagelist)) { |
Christoph Lameter | 95a402c | 2006-06-23 02:03:53 -0700 | [diff] [blame] | 1164 | nr_failed = migrate_pages(&pagelist, new_vma_page, |
Mel Gorman | 7f0f249 | 2011-01-13 15:45:58 -0800 | [diff] [blame] | 1165 | (unsigned long)vma, |
| 1166 | false, true); |
Minchan Kim | cf608ac | 2010-10-26 14:21:29 -0700 | [diff] [blame] | 1167 | if (nr_failed) |
| 1168 | putback_lru_pages(&pagelist); |
| 1169 | } |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 1170 | |
| 1171 | if (!err && nr_failed && (flags & MPOL_MF_STRICT)) |
| 1172 | err = -EIO; |
KOSAKI Motohiro | ab8a3e1 | 2009-10-26 16:49:58 -0700 | [diff] [blame] | 1173 | } else |
| 1174 | putback_lru_pages(&pagelist); |
Christoph Lameter | b20a350 | 2006-03-22 00:09:12 -0800 | [diff] [blame] | 1175 | |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 1176 | up_write(&mm->mmap_sem); |
KOSAKI Motohiro | b05ca73 | 2009-10-26 16:49:59 -0700 | [diff] [blame] | 1177 | mpol_out: |
Lee Schermerhorn | f0be3d3 | 2008-04-28 02:13:08 -0700 | [diff] [blame] | 1178 | mpol_put(new); |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 1179 | return err; |
| 1180 | } |
| 1181 | |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1182 | /* |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1183 | * User space interface with variable sized bitmaps for nodelists. |
| 1184 | */ |
| 1185 | |
| 1186 | /* Copy a node mask from user space. */ |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1187 | static int get_nodes(nodemask_t *nodes, const unsigned long __user *nmask, |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1188 | unsigned long maxnode) |
| 1189 | { |
| 1190 | unsigned long k; |
| 1191 | unsigned long nlongs; |
| 1192 | unsigned long endmask; |
| 1193 | |
| 1194 | --maxnode; |
| 1195 | nodes_clear(*nodes); |
| 1196 | if (maxnode == 0 || !nmask) |
| 1197 | return 0; |
Andi Kleen | a9c930b | 2006-02-20 18:27:59 -0800 | [diff] [blame] | 1198 | if (maxnode > PAGE_SIZE*BITS_PER_BYTE) |
Chris Wright | 636f13c | 2006-02-17 13:59:36 -0800 | [diff] [blame] | 1199 | return -EINVAL; |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1200 | |
| 1201 | nlongs = BITS_TO_LONGS(maxnode); |
| 1202 | if ((maxnode % BITS_PER_LONG) == 0) |
| 1203 | endmask = ~0UL; |
| 1204 | else |
| 1205 | endmask = (1UL << (maxnode % BITS_PER_LONG)) - 1; |
| 1206 | |
| 1207 | /* When the user specified more nodes than supported just check |
| 1208 | if the non supported part is all zero. */ |
| 1209 | if (nlongs > BITS_TO_LONGS(MAX_NUMNODES)) { |
| 1210 | if (nlongs > PAGE_SIZE/sizeof(long)) |
| 1211 | return -EINVAL; |
| 1212 | for (k = BITS_TO_LONGS(MAX_NUMNODES); k < nlongs; k++) { |
| 1213 | unsigned long t; |
| 1214 | if (get_user(t, nmask + k)) |
| 1215 | return -EFAULT; |
| 1216 | if (k == nlongs - 1) { |
| 1217 | if (t & endmask) |
| 1218 | return -EINVAL; |
| 1219 | } else if (t) |
| 1220 | return -EINVAL; |
| 1221 | } |
| 1222 | nlongs = BITS_TO_LONGS(MAX_NUMNODES); |
| 1223 | endmask = ~0UL; |
| 1224 | } |
| 1225 | |
| 1226 | if (copy_from_user(nodes_addr(*nodes), nmask, nlongs*sizeof(unsigned long))) |
| 1227 | return -EFAULT; |
| 1228 | nodes_addr(*nodes)[nlongs-1] &= endmask; |
| 1229 | return 0; |
| 1230 | } |
| 1231 | |
| 1232 | /* Copy a kernel node mask to user space */ |
| 1233 | static int copy_nodes_to_user(unsigned long __user *mask, unsigned long maxnode, |
| 1234 | nodemask_t *nodes) |
| 1235 | { |
| 1236 | unsigned long copy = ALIGN(maxnode-1, 64) / 8; |
| 1237 | const int nbytes = BITS_TO_LONGS(MAX_NUMNODES) * sizeof(long); |
| 1238 | |
| 1239 | if (copy > nbytes) { |
| 1240 | if (copy > PAGE_SIZE) |
| 1241 | return -EINVAL; |
| 1242 | if (clear_user((char __user *)mask + nbytes, copy - nbytes)) |
| 1243 | return -EFAULT; |
| 1244 | copy = nbytes; |
| 1245 | } |
| 1246 | return copy_to_user(mask, nodes_addr(*nodes), copy) ? -EFAULT : 0; |
| 1247 | } |
| 1248 | |
Heiko Carstens | 938bb9f | 2009-01-14 14:14:30 +0100 | [diff] [blame] | 1249 | SYSCALL_DEFINE6(mbind, unsigned long, start, unsigned long, len, |
| 1250 | unsigned long, mode, unsigned long __user *, nmask, |
| 1251 | unsigned long, maxnode, unsigned, flags) |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1252 | { |
| 1253 | nodemask_t nodes; |
| 1254 | int err; |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 1255 | unsigned short mode_flags; |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1256 | |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 1257 | mode_flags = mode & MPOL_MODE_FLAGS; |
| 1258 | mode &= ~MPOL_MODE_FLAGS; |
David Rientjes | a3b51e0 | 2008-04-28 02:12:23 -0700 | [diff] [blame] | 1259 | if (mode >= MPOL_MAX) |
| 1260 | return -EINVAL; |
David Rientjes | 4c50bc0 | 2008-04-28 02:12:30 -0700 | [diff] [blame] | 1261 | if ((mode_flags & MPOL_F_STATIC_NODES) && |
| 1262 | (mode_flags & MPOL_F_RELATIVE_NODES)) |
| 1263 | return -EINVAL; |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1264 | err = get_nodes(&nodes, nmask, maxnode); |
| 1265 | if (err) |
| 1266 | return err; |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 1267 | return do_mbind(start, len, mode, mode_flags, &nodes, flags); |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1268 | } |
| 1269 | |
| 1270 | /* Set the process memory policy */ |
Heiko Carstens | 938bb9f | 2009-01-14 14:14:30 +0100 | [diff] [blame] | 1271 | SYSCALL_DEFINE3(set_mempolicy, int, mode, unsigned long __user *, nmask, |
| 1272 | unsigned long, maxnode) |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1273 | { |
| 1274 | int err; |
| 1275 | nodemask_t nodes; |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 1276 | unsigned short flags; |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1277 | |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 1278 | flags = mode & MPOL_MODE_FLAGS; |
| 1279 | mode &= ~MPOL_MODE_FLAGS; |
| 1280 | if ((unsigned int)mode >= MPOL_MAX) |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1281 | return -EINVAL; |
David Rientjes | 4c50bc0 | 2008-04-28 02:12:30 -0700 | [diff] [blame] | 1282 | if ((flags & MPOL_F_STATIC_NODES) && (flags & MPOL_F_RELATIVE_NODES)) |
| 1283 | return -EINVAL; |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1284 | err = get_nodes(&nodes, nmask, maxnode); |
| 1285 | if (err) |
| 1286 | return err; |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 1287 | return do_set_mempolicy(mode, flags, &nodes); |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1288 | } |
| 1289 | |
Heiko Carstens | 938bb9f | 2009-01-14 14:14:30 +0100 | [diff] [blame] | 1290 | SYSCALL_DEFINE4(migrate_pages, pid_t, pid, unsigned long, maxnode, |
| 1291 | const unsigned long __user *, old_nodes, |
| 1292 | const unsigned long __user *, new_nodes) |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1293 | { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1294 | const struct cred *cred = current_cred(), *tcred; |
KOSAKI Motohiro | 596d7cf | 2010-08-09 17:19:01 -0700 | [diff] [blame] | 1295 | struct mm_struct *mm = NULL; |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1296 | struct task_struct *task; |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1297 | nodemask_t task_nodes; |
| 1298 | int err; |
KOSAKI Motohiro | 596d7cf | 2010-08-09 17:19:01 -0700 | [diff] [blame] | 1299 | nodemask_t *old; |
| 1300 | nodemask_t *new; |
| 1301 | NODEMASK_SCRATCH(scratch); |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1302 | |
KOSAKI Motohiro | 596d7cf | 2010-08-09 17:19:01 -0700 | [diff] [blame] | 1303 | if (!scratch) |
| 1304 | return -ENOMEM; |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1305 | |
KOSAKI Motohiro | 596d7cf | 2010-08-09 17:19:01 -0700 | [diff] [blame] | 1306 | old = &scratch->mask1; |
| 1307 | new = &scratch->mask2; |
| 1308 | |
| 1309 | err = get_nodes(old, old_nodes, maxnode); |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1310 | if (err) |
KOSAKI Motohiro | 596d7cf | 2010-08-09 17:19:01 -0700 | [diff] [blame] | 1311 | goto out; |
| 1312 | |
| 1313 | err = get_nodes(new, new_nodes, maxnode); |
| 1314 | if (err) |
| 1315 | goto out; |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1316 | |
| 1317 | /* Find the mm_struct */ |
Zeng Zhaoming | 55cfaa3 | 2010-12-02 14:31:13 -0800 | [diff] [blame] | 1318 | rcu_read_lock(); |
Pavel Emelyanov | 228ebcb | 2007-10-18 23:40:16 -0700 | [diff] [blame] | 1319 | task = pid ? find_task_by_vpid(pid) : current; |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1320 | if (!task) { |
Zeng Zhaoming | 55cfaa3 | 2010-12-02 14:31:13 -0800 | [diff] [blame] | 1321 | rcu_read_unlock(); |
KOSAKI Motohiro | 596d7cf | 2010-08-09 17:19:01 -0700 | [diff] [blame] | 1322 | err = -ESRCH; |
| 1323 | goto out; |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1324 | } |
| 1325 | mm = get_task_mm(task); |
Zeng Zhaoming | 55cfaa3 | 2010-12-02 14:31:13 -0800 | [diff] [blame] | 1326 | rcu_read_unlock(); |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1327 | |
KOSAKI Motohiro | 596d7cf | 2010-08-09 17:19:01 -0700 | [diff] [blame] | 1328 | err = -EINVAL; |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1329 | if (!mm) |
KOSAKI Motohiro | 596d7cf | 2010-08-09 17:19:01 -0700 | [diff] [blame] | 1330 | goto out; |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1331 | |
| 1332 | /* |
| 1333 | * Check if this process has the right to modify the specified |
| 1334 | * process. The right exists if the process has administrative |
Alexey Dobriyan | 7f927fc | 2006-03-28 01:56:53 -0800 | [diff] [blame] | 1335 | * capabilities, superuser privileges or the same |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1336 | * userid as the target process. |
| 1337 | */ |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1338 | rcu_read_lock(); |
| 1339 | tcred = __task_cred(task); |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 1340 | if (cred->euid != tcred->suid && cred->euid != tcred->uid && |
| 1341 | cred->uid != tcred->suid && cred->uid != tcred->uid && |
Christoph Lameter | 74c0024 | 2006-03-14 19:50:21 -0800 | [diff] [blame] | 1342 | !capable(CAP_SYS_NICE)) { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1343 | rcu_read_unlock(); |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1344 | err = -EPERM; |
| 1345 | goto out; |
| 1346 | } |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1347 | rcu_read_unlock(); |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1348 | |
| 1349 | task_nodes = cpuset_mems_allowed(task); |
| 1350 | /* Is the user allowed to access the target nodes? */ |
KOSAKI Motohiro | 596d7cf | 2010-08-09 17:19:01 -0700 | [diff] [blame] | 1351 | if (!nodes_subset(*new, task_nodes) && !capable(CAP_SYS_NICE)) { |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1352 | err = -EPERM; |
| 1353 | goto out; |
| 1354 | } |
| 1355 | |
KOSAKI Motohiro | 596d7cf | 2010-08-09 17:19:01 -0700 | [diff] [blame] | 1356 | if (!nodes_subset(*new, node_states[N_HIGH_MEMORY])) { |
Christoph Lameter | 3b42d28 | 2007-08-31 00:12:08 -0700 | [diff] [blame] | 1357 | err = -EINVAL; |
| 1358 | goto out; |
| 1359 | } |
| 1360 | |
David Quigley | 86c3a76 | 2006-06-23 02:04:02 -0700 | [diff] [blame] | 1361 | err = security_task_movememory(task); |
| 1362 | if (err) |
| 1363 | goto out; |
| 1364 | |
KOSAKI Motohiro | 596d7cf | 2010-08-09 17:19:01 -0700 | [diff] [blame] | 1365 | err = do_migrate_pages(mm, old, new, |
Christoph Lameter | 74c0024 | 2006-03-14 19:50:21 -0800 | [diff] [blame] | 1366 | capable(CAP_SYS_NICE) ? MPOL_MF_MOVE_ALL : MPOL_MF_MOVE); |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1367 | out: |
KOSAKI Motohiro | 596d7cf | 2010-08-09 17:19:01 -0700 | [diff] [blame] | 1368 | if (mm) |
| 1369 | mmput(mm); |
| 1370 | NODEMASK_SCRATCH_FREE(scratch); |
| 1371 | |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1372 | return err; |
| 1373 | } |
| 1374 | |
| 1375 | |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1376 | /* Retrieve NUMA policy */ |
Heiko Carstens | 938bb9f | 2009-01-14 14:14:30 +0100 | [diff] [blame] | 1377 | SYSCALL_DEFINE5(get_mempolicy, int __user *, policy, |
| 1378 | unsigned long __user *, nmask, unsigned long, maxnode, |
| 1379 | unsigned long, addr, unsigned long, flags) |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1380 | { |
Adrian Bunk | dbcb0f1 | 2007-10-16 01:26:26 -0700 | [diff] [blame] | 1381 | int err; |
| 1382 | int uninitialized_var(pval); |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1383 | nodemask_t nodes; |
| 1384 | |
| 1385 | if (nmask != NULL && maxnode < MAX_NUMNODES) |
| 1386 | return -EINVAL; |
| 1387 | |
| 1388 | err = do_get_mempolicy(&pval, &nodes, addr, flags); |
| 1389 | |
| 1390 | if (err) |
| 1391 | return err; |
| 1392 | |
| 1393 | if (policy && put_user(pval, policy)) |
| 1394 | return -EFAULT; |
| 1395 | |
| 1396 | if (nmask) |
| 1397 | err = copy_nodes_to_user(nmask, maxnode, &nodes); |
| 1398 | |
| 1399 | return err; |
| 1400 | } |
| 1401 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1402 | #ifdef CONFIG_COMPAT |
| 1403 | |
| 1404 | asmlinkage long compat_sys_get_mempolicy(int __user *policy, |
| 1405 | compat_ulong_t __user *nmask, |
| 1406 | compat_ulong_t maxnode, |
| 1407 | compat_ulong_t addr, compat_ulong_t flags) |
| 1408 | { |
| 1409 | long err; |
| 1410 | unsigned long __user *nm = NULL; |
| 1411 | unsigned long nr_bits, alloc_size; |
| 1412 | DECLARE_BITMAP(bm, MAX_NUMNODES); |
| 1413 | |
| 1414 | nr_bits = min_t(unsigned long, maxnode-1, MAX_NUMNODES); |
| 1415 | alloc_size = ALIGN(nr_bits, BITS_PER_LONG) / 8; |
| 1416 | |
| 1417 | if (nmask) |
| 1418 | nm = compat_alloc_user_space(alloc_size); |
| 1419 | |
| 1420 | err = sys_get_mempolicy(policy, nm, nr_bits+1, addr, flags); |
| 1421 | |
| 1422 | if (!err && nmask) { |
KAMEZAWA Hiroyuki | 2bbff6c | 2011-09-14 16:21:02 -0700 | [diff] [blame] | 1423 | unsigned long copy_size; |
| 1424 | copy_size = min_t(unsigned long, sizeof(bm), alloc_size); |
| 1425 | err = copy_from_user(bm, nm, copy_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1426 | /* ensure entire bitmap is zeroed */ |
| 1427 | err |= clear_user(nmask, ALIGN(maxnode-1, 8) / 8); |
| 1428 | err |= compat_put_bitmap(nmask, bm, nr_bits); |
| 1429 | } |
| 1430 | |
| 1431 | return err; |
| 1432 | } |
| 1433 | |
| 1434 | asmlinkage long compat_sys_set_mempolicy(int mode, compat_ulong_t __user *nmask, |
| 1435 | compat_ulong_t maxnode) |
| 1436 | { |
| 1437 | long err = 0; |
| 1438 | unsigned long __user *nm = NULL; |
| 1439 | unsigned long nr_bits, alloc_size; |
| 1440 | DECLARE_BITMAP(bm, MAX_NUMNODES); |
| 1441 | |
| 1442 | nr_bits = min_t(unsigned long, maxnode-1, MAX_NUMNODES); |
| 1443 | alloc_size = ALIGN(nr_bits, BITS_PER_LONG) / 8; |
| 1444 | |
| 1445 | if (nmask) { |
| 1446 | err = compat_get_bitmap(bm, nmask, nr_bits); |
| 1447 | nm = compat_alloc_user_space(alloc_size); |
| 1448 | err |= copy_to_user(nm, bm, alloc_size); |
| 1449 | } |
| 1450 | |
| 1451 | if (err) |
| 1452 | return -EFAULT; |
| 1453 | |
| 1454 | return sys_set_mempolicy(mode, nm, nr_bits+1); |
| 1455 | } |
| 1456 | |
| 1457 | asmlinkage long compat_sys_mbind(compat_ulong_t start, compat_ulong_t len, |
| 1458 | compat_ulong_t mode, compat_ulong_t __user *nmask, |
| 1459 | compat_ulong_t maxnode, compat_ulong_t flags) |
| 1460 | { |
| 1461 | long err = 0; |
| 1462 | unsigned long __user *nm = NULL; |
| 1463 | unsigned long nr_bits, alloc_size; |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 1464 | nodemask_t bm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1465 | |
| 1466 | nr_bits = min_t(unsigned long, maxnode-1, MAX_NUMNODES); |
| 1467 | alloc_size = ALIGN(nr_bits, BITS_PER_LONG) / 8; |
| 1468 | |
| 1469 | if (nmask) { |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 1470 | err = compat_get_bitmap(nodes_addr(bm), nmask, nr_bits); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1471 | nm = compat_alloc_user_space(alloc_size); |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 1472 | err |= copy_to_user(nm, nodes_addr(bm), alloc_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1473 | } |
| 1474 | |
| 1475 | if (err) |
| 1476 | return -EFAULT; |
| 1477 | |
| 1478 | return sys_mbind(start, len, mode, nm, nr_bits+1, flags); |
| 1479 | } |
| 1480 | |
| 1481 | #endif |
| 1482 | |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1483 | /* |
| 1484 | * get_vma_policy(@task, @vma, @addr) |
| 1485 | * @task - task for fallback if vma policy == default |
| 1486 | * @vma - virtual memory area whose policy is sought |
| 1487 | * @addr - address in @vma for shared policy lookup |
| 1488 | * |
| 1489 | * Returns effective policy for a VMA at specified address. |
| 1490 | * Falls back to @task or system default policy, as necessary. |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1491 | * Current or other task's task mempolicy and non-shared vma policies |
| 1492 | * are protected by the task's mmap_sem, which must be held for read by |
| 1493 | * the caller. |
| 1494 | * Shared policies [those marked as MPOL_F_SHARED] require an extra reference |
| 1495 | * count--added by the get_policy() vm_op, as appropriate--to protect against |
| 1496 | * freeing by another task. It is the caller's responsibility to free the |
| 1497 | * extra reference for shared policies. |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1498 | */ |
Stephen Wilson | d98f6cb | 2011-05-24 17:12:41 -0700 | [diff] [blame] | 1499 | struct mempolicy *get_vma_policy(struct task_struct *task, |
Christoph Lameter | 48fce34 | 2006-01-08 01:01:03 -0800 | [diff] [blame] | 1500 | struct vm_area_struct *vma, unsigned long addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1501 | { |
Christoph Lameter | 6e21c8f | 2005-09-03 15:54:45 -0700 | [diff] [blame] | 1502 | struct mempolicy *pol = task->mempolicy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1503 | |
| 1504 | if (vma) { |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1505 | if (vma->vm_ops && vma->vm_ops->get_policy) { |
Lee Schermerhorn | ae4d8c1 | 2008-04-28 02:13:11 -0700 | [diff] [blame] | 1506 | struct mempolicy *vpol = vma->vm_ops->get_policy(vma, |
| 1507 | addr); |
| 1508 | if (vpol) |
| 1509 | pol = vpol; |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 1510 | } else if (vma->vm_policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1511 | pol = vma->vm_policy; |
| 1512 | } |
| 1513 | if (!pol) |
| 1514 | pol = &default_policy; |
| 1515 | return pol; |
| 1516 | } |
| 1517 | |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1518 | /* |
| 1519 | * Return a nodemask representing a mempolicy for filtering nodes for |
| 1520 | * page allocation |
| 1521 | */ |
| 1522 | static nodemask_t *policy_nodemask(gfp_t gfp, struct mempolicy *policy) |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1523 | { |
| 1524 | /* Lower zones don't get a nodemask applied for MPOL_BIND */ |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 1525 | if (unlikely(policy->mode == MPOL_BIND) && |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1526 | gfp_zone(gfp) >= policy_zone && |
| 1527 | cpuset_nodemask_valid_mems_allowed(&policy->v.nodes)) |
| 1528 | return &policy->v.nodes; |
| 1529 | |
| 1530 | return NULL; |
| 1531 | } |
| 1532 | |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1533 | /* Return a zonelist indicated by gfp for node representing a mempolicy */ |
Andi Kleen | 2f5f948 | 2011-03-04 17:36:29 -0800 | [diff] [blame] | 1534 | static struct zonelist *policy_zonelist(gfp_t gfp, struct mempolicy *policy, |
| 1535 | int nd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1536 | { |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 1537 | switch (policy->mode) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1538 | case MPOL_PREFERRED: |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 1539 | if (!(policy->flags & MPOL_F_LOCAL)) |
| 1540 | nd = policy->v.preferred_node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1541 | break; |
| 1542 | case MPOL_BIND: |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1543 | /* |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1544 | * Normally, MPOL_BIND allocations are node-local within the |
| 1545 | * allowed nodemask. However, if __GFP_THISNODE is set and the |
Bob Liu | 6eb27e1 | 2010-05-24 14:32:00 -0700 | [diff] [blame] | 1546 | * 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] | 1547 | * the first node in the mask instead. |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1548 | */ |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1549 | if (unlikely(gfp & __GFP_THISNODE) && |
| 1550 | unlikely(!node_isset(nd, policy->v.nodes))) |
| 1551 | nd = first_node(policy->v.nodes); |
| 1552 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1553 | default: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1554 | BUG(); |
| 1555 | } |
Mel Gorman | 0e88460 | 2008-04-28 02:12:14 -0700 | [diff] [blame] | 1556 | return node_zonelist(nd, gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1557 | } |
| 1558 | |
| 1559 | /* Do dynamic interleaving for a process */ |
| 1560 | static unsigned interleave_nodes(struct mempolicy *policy) |
| 1561 | { |
| 1562 | unsigned nid, next; |
| 1563 | struct task_struct *me = current; |
| 1564 | |
| 1565 | nid = me->il_next; |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 1566 | next = next_node(nid, policy->v.nodes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1567 | if (next >= MAX_NUMNODES) |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 1568 | next = first_node(policy->v.nodes); |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 1569 | if (next < MAX_NUMNODES) |
| 1570 | me->il_next = next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1571 | return nid; |
| 1572 | } |
| 1573 | |
Christoph Lameter | dc85da1 | 2006-01-18 17:42:36 -0800 | [diff] [blame] | 1574 | /* |
| 1575 | * Depending on the memory policy provide a node from which to allocate the |
| 1576 | * next slab entry. |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1577 | * @policy must be protected by freeing by the caller. If @policy is |
| 1578 | * the current task's mempolicy, this protection is implicit, as only the |
| 1579 | * task can change it's policy. The system default policy requires no |
| 1580 | * such protection. |
Christoph Lameter | dc85da1 | 2006-01-18 17:42:36 -0800 | [diff] [blame] | 1581 | */ |
| 1582 | unsigned slab_node(struct mempolicy *policy) |
| 1583 | { |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 1584 | if (!policy || policy->flags & MPOL_F_LOCAL) |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 1585 | return numa_node_id(); |
Christoph Lameter | 765c450 | 2006-09-27 01:50:08 -0700 | [diff] [blame] | 1586 | |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 1587 | switch (policy->mode) { |
| 1588 | case MPOL_PREFERRED: |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 1589 | /* |
| 1590 | * handled MPOL_F_LOCAL above |
| 1591 | */ |
| 1592 | return policy->v.preferred_node; |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 1593 | |
Christoph Lameter | dc85da1 | 2006-01-18 17:42:36 -0800 | [diff] [blame] | 1594 | case MPOL_INTERLEAVE: |
| 1595 | return interleave_nodes(policy); |
| 1596 | |
Mel Gorman | dd1a239 | 2008-04-28 02:12:17 -0700 | [diff] [blame] | 1597 | case MPOL_BIND: { |
Christoph Lameter | dc85da1 | 2006-01-18 17:42:36 -0800 | [diff] [blame] | 1598 | /* |
| 1599 | * Follow bind policy behavior and start allocation at the |
| 1600 | * first node. |
| 1601 | */ |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1602 | struct zonelist *zonelist; |
| 1603 | struct zone *zone; |
| 1604 | enum zone_type highest_zoneidx = gfp_zone(GFP_KERNEL); |
| 1605 | zonelist = &NODE_DATA(numa_node_id())->node_zonelists[0]; |
| 1606 | (void)first_zones_zonelist(zonelist, highest_zoneidx, |
| 1607 | &policy->v.nodes, |
| 1608 | &zone); |
Eric Dumazet | 800416f | 2010-10-27 19:33:43 +0200 | [diff] [blame] | 1609 | return zone ? zone->node : numa_node_id(); |
Mel Gorman | dd1a239 | 2008-04-28 02:12:17 -0700 | [diff] [blame] | 1610 | } |
Christoph Lameter | dc85da1 | 2006-01-18 17:42:36 -0800 | [diff] [blame] | 1611 | |
Christoph Lameter | dc85da1 | 2006-01-18 17:42:36 -0800 | [diff] [blame] | 1612 | default: |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 1613 | BUG(); |
Christoph Lameter | dc85da1 | 2006-01-18 17:42:36 -0800 | [diff] [blame] | 1614 | } |
| 1615 | } |
| 1616 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1617 | /* Do static interleaving for a VMA with known offset. */ |
| 1618 | static unsigned offset_il_node(struct mempolicy *pol, |
| 1619 | struct vm_area_struct *vma, unsigned long off) |
| 1620 | { |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 1621 | unsigned nnodes = nodes_weight(pol->v.nodes); |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 1622 | unsigned target; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1623 | int c; |
| 1624 | int nid = -1; |
| 1625 | |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 1626 | if (!nnodes) |
| 1627 | return numa_node_id(); |
| 1628 | target = (unsigned int)off % nnodes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1629 | c = 0; |
| 1630 | do { |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 1631 | nid = next_node(nid, pol->v.nodes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1632 | c++; |
| 1633 | } while (c <= target); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1634 | return nid; |
| 1635 | } |
| 1636 | |
Christoph Lameter | 5da7ca8 | 2006-01-06 00:10:46 -0800 | [diff] [blame] | 1637 | /* Determine a node number for interleave */ |
| 1638 | static inline unsigned interleave_nid(struct mempolicy *pol, |
| 1639 | struct vm_area_struct *vma, unsigned long addr, int shift) |
| 1640 | { |
| 1641 | if (vma) { |
| 1642 | unsigned long off; |
| 1643 | |
Nishanth Aravamudan | 3b98b08 | 2006-08-31 21:27:53 -0700 | [diff] [blame] | 1644 | /* |
| 1645 | * for small pages, there is no difference between |
| 1646 | * shift and PAGE_SHIFT, so the bit-shift is safe. |
| 1647 | * for huge pages, since vm_pgoff is in units of small |
| 1648 | * pages, we need to shift off the always 0 bits to get |
| 1649 | * a useful offset. |
| 1650 | */ |
| 1651 | BUG_ON(shift < PAGE_SHIFT); |
| 1652 | off = vma->vm_pgoff >> (shift - PAGE_SHIFT); |
Christoph Lameter | 5da7ca8 | 2006-01-06 00:10:46 -0800 | [diff] [blame] | 1653 | off += (addr - vma->vm_start) >> shift; |
| 1654 | return offset_il_node(pol, vma, off); |
| 1655 | } else |
| 1656 | return interleave_nodes(pol); |
| 1657 | } |
| 1658 | |
Michal Hocko | 778d3b0 | 2011-07-26 16:08:30 -0700 | [diff] [blame] | 1659 | /* |
| 1660 | * Return the bit number of a random bit set in the nodemask. |
| 1661 | * (returns -1 if nodemask is empty) |
| 1662 | */ |
| 1663 | int node_random(const nodemask_t *maskp) |
| 1664 | { |
| 1665 | int w, bit = -1; |
| 1666 | |
| 1667 | w = nodes_weight(*maskp); |
| 1668 | if (w) |
| 1669 | bit = bitmap_ord_to_pos(maskp->bits, |
| 1670 | get_random_int() % w, MAX_NUMNODES); |
| 1671 | return bit; |
| 1672 | } |
| 1673 | |
Chen, Kenneth W | 00ac59a | 2006-02-03 21:51:14 +0100 | [diff] [blame] | 1674 | #ifdef CONFIG_HUGETLBFS |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1675 | /* |
| 1676 | * huge_zonelist(@vma, @addr, @gfp_flags, @mpol) |
| 1677 | * @vma = virtual memory area whose policy is sought |
| 1678 | * @addr = address in @vma for shared policy lookup and interleave policy |
| 1679 | * @gfp_flags = for requested zone |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1680 | * @mpol = pointer to mempolicy pointer for reference counted mempolicy |
| 1681 | * @nodemask = pointer to nodemask pointer for MPOL_BIND nodemask |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1682 | * |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1683 | * Returns a zonelist suitable for a huge page allocation and a pointer |
| 1684 | * to the struct mempolicy for conditional unref after allocation. |
| 1685 | * If the effective policy is 'BIND, returns a pointer to the mempolicy's |
| 1686 | * @nodemask for filtering the zonelist. |
Miao Xie | c0ff745 | 2010-05-24 14:32:08 -0700 | [diff] [blame] | 1687 | * |
| 1688 | * Must be protected by get_mems_allowed() |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1689 | */ |
Mel Gorman | 396faf0 | 2007-07-17 04:03:13 -0700 | [diff] [blame] | 1690 | struct zonelist *huge_zonelist(struct vm_area_struct *vma, unsigned long addr, |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1691 | gfp_t gfp_flags, struct mempolicy **mpol, |
| 1692 | nodemask_t **nodemask) |
Christoph Lameter | 5da7ca8 | 2006-01-06 00:10:46 -0800 | [diff] [blame] | 1693 | { |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1694 | struct zonelist *zl; |
Christoph Lameter | 5da7ca8 | 2006-01-06 00:10:46 -0800 | [diff] [blame] | 1695 | |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1696 | *mpol = get_vma_policy(current, vma, addr); |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1697 | *nodemask = NULL; /* assume !MPOL_BIND */ |
Christoph Lameter | 5da7ca8 | 2006-01-06 00:10:46 -0800 | [diff] [blame] | 1698 | |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1699 | if (unlikely((*mpol)->mode == MPOL_INTERLEAVE)) { |
| 1700 | zl = node_zonelist(interleave_nid(*mpol, vma, addr, |
Andi Kleen | a551643 | 2008-07-23 21:27:41 -0700 | [diff] [blame] | 1701 | huge_page_shift(hstate_vma(vma))), gfp_flags); |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1702 | } else { |
Andi Kleen | 2f5f948 | 2011-03-04 17:36:29 -0800 | [diff] [blame] | 1703 | zl = policy_zonelist(gfp_flags, *mpol, numa_node_id()); |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1704 | if ((*mpol)->mode == MPOL_BIND) |
| 1705 | *nodemask = &(*mpol)->v.nodes; |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1706 | } |
| 1707 | return zl; |
Christoph Lameter | 5da7ca8 | 2006-01-06 00:10:46 -0800 | [diff] [blame] | 1708 | } |
Lee Schermerhorn | 06808b0 | 2009-12-14 17:58:21 -0800 | [diff] [blame] | 1709 | |
| 1710 | /* |
| 1711 | * init_nodemask_of_mempolicy |
| 1712 | * |
| 1713 | * If the current task's mempolicy is "default" [NULL], return 'false' |
| 1714 | * to indicate default policy. Otherwise, extract the policy nodemask |
| 1715 | * for 'bind' or 'interleave' policy into the argument nodemask, or |
| 1716 | * initialize the argument nodemask to contain the single node for |
| 1717 | * 'preferred' or 'local' policy and return 'true' to indicate presence |
| 1718 | * of non-default mempolicy. |
| 1719 | * |
| 1720 | * We don't bother with reference counting the mempolicy [mpol_get/put] |
| 1721 | * because the current task is examining it's own mempolicy and a task's |
| 1722 | * mempolicy is only ever changed by the task itself. |
| 1723 | * |
| 1724 | * N.B., it is the caller's responsibility to free a returned nodemask. |
| 1725 | */ |
| 1726 | bool init_nodemask_of_mempolicy(nodemask_t *mask) |
| 1727 | { |
| 1728 | struct mempolicy *mempolicy; |
| 1729 | int nid; |
| 1730 | |
| 1731 | if (!(mask && current->mempolicy)) |
| 1732 | return false; |
| 1733 | |
Miao Xie | c0ff745 | 2010-05-24 14:32:08 -0700 | [diff] [blame] | 1734 | task_lock(current); |
Lee Schermerhorn | 06808b0 | 2009-12-14 17:58:21 -0800 | [diff] [blame] | 1735 | mempolicy = current->mempolicy; |
| 1736 | switch (mempolicy->mode) { |
| 1737 | case MPOL_PREFERRED: |
| 1738 | if (mempolicy->flags & MPOL_F_LOCAL) |
| 1739 | nid = numa_node_id(); |
| 1740 | else |
| 1741 | nid = mempolicy->v.preferred_node; |
| 1742 | init_nodemask_of_node(mask, nid); |
| 1743 | break; |
| 1744 | |
| 1745 | case MPOL_BIND: |
| 1746 | /* Fall through */ |
| 1747 | case MPOL_INTERLEAVE: |
| 1748 | *mask = mempolicy->v.nodes; |
| 1749 | break; |
| 1750 | |
| 1751 | default: |
| 1752 | BUG(); |
| 1753 | } |
Miao Xie | c0ff745 | 2010-05-24 14:32:08 -0700 | [diff] [blame] | 1754 | task_unlock(current); |
Lee Schermerhorn | 06808b0 | 2009-12-14 17:58:21 -0800 | [diff] [blame] | 1755 | |
| 1756 | return true; |
| 1757 | } |
Chen, Kenneth W | 00ac59a | 2006-02-03 21:51:14 +0100 | [diff] [blame] | 1758 | #endif |
Christoph Lameter | 5da7ca8 | 2006-01-06 00:10:46 -0800 | [diff] [blame] | 1759 | |
David Rientjes | 6f48d0eb | 2010-08-09 17:18:52 -0700 | [diff] [blame] | 1760 | /* |
| 1761 | * mempolicy_nodemask_intersects |
| 1762 | * |
| 1763 | * If tsk's mempolicy is "default" [NULL], return 'true' to indicate default |
| 1764 | * policy. Otherwise, check for intersection between mask and the policy |
| 1765 | * nodemask for 'bind' or 'interleave' policy. For 'perferred' or 'local' |
| 1766 | * policy, always return true since it may allocate elsewhere on fallback. |
| 1767 | * |
| 1768 | * Takes task_lock(tsk) to prevent freeing of its mempolicy. |
| 1769 | */ |
| 1770 | bool mempolicy_nodemask_intersects(struct task_struct *tsk, |
| 1771 | const nodemask_t *mask) |
| 1772 | { |
| 1773 | struct mempolicy *mempolicy; |
| 1774 | bool ret = true; |
| 1775 | |
| 1776 | if (!mask) |
| 1777 | return ret; |
| 1778 | task_lock(tsk); |
| 1779 | mempolicy = tsk->mempolicy; |
| 1780 | if (!mempolicy) |
| 1781 | goto out; |
| 1782 | |
| 1783 | switch (mempolicy->mode) { |
| 1784 | case MPOL_PREFERRED: |
| 1785 | /* |
| 1786 | * MPOL_PREFERRED and MPOL_F_LOCAL are only preferred nodes to |
| 1787 | * allocate from, they may fallback to other nodes when oom. |
| 1788 | * Thus, it's possible for tsk to have allocated memory from |
| 1789 | * nodes in mask. |
| 1790 | */ |
| 1791 | break; |
| 1792 | case MPOL_BIND: |
| 1793 | case MPOL_INTERLEAVE: |
| 1794 | ret = nodes_intersects(mempolicy->v.nodes, *mask); |
| 1795 | break; |
| 1796 | default: |
| 1797 | BUG(); |
| 1798 | } |
| 1799 | out: |
| 1800 | task_unlock(tsk); |
| 1801 | return ret; |
| 1802 | } |
| 1803 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1804 | /* Allocate a page in interleaved policy. |
| 1805 | Own path because it needs to do special accounting. */ |
Andi Kleen | 662f3a0 | 2005-10-29 18:15:49 -0700 | [diff] [blame] | 1806 | static struct page *alloc_page_interleave(gfp_t gfp, unsigned order, |
| 1807 | unsigned nid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1808 | { |
| 1809 | struct zonelist *zl; |
| 1810 | struct page *page; |
| 1811 | |
Mel Gorman | 0e88460 | 2008-04-28 02:12:14 -0700 | [diff] [blame] | 1812 | zl = node_zonelist(nid, gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1813 | page = __alloc_pages(gfp, order, zl); |
Mel Gorman | dd1a239 | 2008-04-28 02:12:17 -0700 | [diff] [blame] | 1814 | if (page && page_zone(page) == zonelist_zone(&zl->_zonerefs[0])) |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 1815 | inc_zone_page_state(page, NUMA_INTERLEAVE_HIT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1816 | return page; |
| 1817 | } |
| 1818 | |
| 1819 | /** |
Andrea Arcangeli | 0bbbc0b | 2011-01-13 15:47:05 -0800 | [diff] [blame] | 1820 | * alloc_pages_vma - Allocate a page for a VMA. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1821 | * |
| 1822 | * @gfp: |
| 1823 | * %GFP_USER user allocation. |
| 1824 | * %GFP_KERNEL kernel allocations, |
| 1825 | * %GFP_HIGHMEM highmem/user allocations, |
| 1826 | * %GFP_FS allocation should not call back into a file system. |
| 1827 | * %GFP_ATOMIC don't sleep. |
| 1828 | * |
Andrea Arcangeli | 0bbbc0b | 2011-01-13 15:47:05 -0800 | [diff] [blame] | 1829 | * @order:Order of the GFP allocation. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1830 | * @vma: Pointer to VMA or NULL if not available. |
| 1831 | * @addr: Virtual Address of the allocation. Must be inside the VMA. |
| 1832 | * |
| 1833 | * This function allocates a page from the kernel page pool and applies |
| 1834 | * a NUMA policy associated with the VMA or the current process. |
| 1835 | * When VMA is not NULL caller must hold down_read on the mmap_sem of the |
| 1836 | * mm_struct of the VMA to prevent it from going away. Should be used for |
| 1837 | * all allocations for pages that will be mapped into |
| 1838 | * user space. Returns NULL when no page can be allocated. |
| 1839 | * |
| 1840 | * Should be called with the mm_sem of the vma hold. |
| 1841 | */ |
| 1842 | struct page * |
Andrea Arcangeli | 0bbbc0b | 2011-01-13 15:47:05 -0800 | [diff] [blame] | 1843 | alloc_pages_vma(gfp_t gfp, int order, struct vm_area_struct *vma, |
Andi Kleen | 2f5f948 | 2011-03-04 17:36:29 -0800 | [diff] [blame] | 1844 | unsigned long addr, int node) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1845 | { |
Christoph Lameter | 6e21c8f | 2005-09-03 15:54:45 -0700 | [diff] [blame] | 1846 | struct mempolicy *pol = get_vma_policy(current, vma, addr); |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1847 | struct zonelist *zl; |
Miao Xie | c0ff745 | 2010-05-24 14:32:08 -0700 | [diff] [blame] | 1848 | struct page *page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1849 | |
Miao Xie | c0ff745 | 2010-05-24 14:32:08 -0700 | [diff] [blame] | 1850 | get_mems_allowed(); |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 1851 | if (unlikely(pol->mode == MPOL_INTERLEAVE)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1852 | unsigned nid; |
Christoph Lameter | 5da7ca8 | 2006-01-06 00:10:46 -0800 | [diff] [blame] | 1853 | |
Andi Kleen | 8eac563 | 2011-02-25 14:44:28 -0800 | [diff] [blame] | 1854 | nid = interleave_nid(pol, vma, addr, PAGE_SHIFT + order); |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1855 | mpol_cond_put(pol); |
Andrea Arcangeli | 0bbbc0b | 2011-01-13 15:47:05 -0800 | [diff] [blame] | 1856 | page = alloc_page_interleave(gfp, order, nid); |
Miao Xie | c0ff745 | 2010-05-24 14:32:08 -0700 | [diff] [blame] | 1857 | put_mems_allowed(); |
| 1858 | return page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1859 | } |
Andi Kleen | 2f5f948 | 2011-03-04 17:36:29 -0800 | [diff] [blame] | 1860 | zl = policy_zonelist(gfp, pol, node); |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1861 | if (unlikely(mpol_needs_cond_ref(pol))) { |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1862 | /* |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1863 | * slow path: ref counted shared policy |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1864 | */ |
Andrea Arcangeli | 0bbbc0b | 2011-01-13 15:47:05 -0800 | [diff] [blame] | 1865 | struct page *page = __alloc_pages_nodemask(gfp, order, |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1866 | zl, policy_nodemask(gfp, pol)); |
Lee Schermerhorn | f0be3d3 | 2008-04-28 02:13:08 -0700 | [diff] [blame] | 1867 | __mpol_put(pol); |
Miao Xie | c0ff745 | 2010-05-24 14:32:08 -0700 | [diff] [blame] | 1868 | put_mems_allowed(); |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1869 | return page; |
| 1870 | } |
| 1871 | /* |
| 1872 | * fast path: default or task policy |
| 1873 | */ |
Andrea Arcangeli | 0bbbc0b | 2011-01-13 15:47:05 -0800 | [diff] [blame] | 1874 | page = __alloc_pages_nodemask(gfp, order, zl, |
| 1875 | policy_nodemask(gfp, pol)); |
Miao Xie | c0ff745 | 2010-05-24 14:32:08 -0700 | [diff] [blame] | 1876 | put_mems_allowed(); |
| 1877 | return page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1878 | } |
| 1879 | |
| 1880 | /** |
| 1881 | * alloc_pages_current - Allocate pages. |
| 1882 | * |
| 1883 | * @gfp: |
| 1884 | * %GFP_USER user allocation, |
| 1885 | * %GFP_KERNEL kernel allocation, |
| 1886 | * %GFP_HIGHMEM highmem allocation, |
| 1887 | * %GFP_FS don't call back into a file system. |
| 1888 | * %GFP_ATOMIC don't sleep. |
| 1889 | * @order: Power of two of allocation size in pages. 0 is a single page. |
| 1890 | * |
| 1891 | * Allocate a page from the kernel page pool. When not in |
| 1892 | * interrupt context and apply the current process NUMA policy. |
| 1893 | * Returns NULL when no page can be allocated. |
| 1894 | * |
Paul Jackson | cf2a473 | 2006-01-08 01:01:54 -0800 | [diff] [blame] | 1895 | * Don't call cpuset_update_task_memory_state() unless |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1896 | * 1) it's ok to take cpuset_sem (can WAIT), and |
| 1897 | * 2) allocating for current task (not interrupt). |
| 1898 | */ |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1899 | struct page *alloc_pages_current(gfp_t gfp, unsigned order) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1900 | { |
| 1901 | struct mempolicy *pol = current->mempolicy; |
Miao Xie | c0ff745 | 2010-05-24 14:32:08 -0700 | [diff] [blame] | 1902 | struct page *page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1903 | |
Christoph Lameter | 9b819d2 | 2006-09-25 23:31:40 -0700 | [diff] [blame] | 1904 | if (!pol || in_interrupt() || (gfp & __GFP_THISNODE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1905 | pol = &default_policy; |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1906 | |
Miao Xie | c0ff745 | 2010-05-24 14:32:08 -0700 | [diff] [blame] | 1907 | get_mems_allowed(); |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1908 | /* |
| 1909 | * No reference counting needed for current->mempolicy |
| 1910 | * nor system default_policy |
| 1911 | */ |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 1912 | if (pol->mode == MPOL_INTERLEAVE) |
Miao Xie | c0ff745 | 2010-05-24 14:32:08 -0700 | [diff] [blame] | 1913 | page = alloc_page_interleave(gfp, order, interleave_nodes(pol)); |
| 1914 | else |
| 1915 | page = __alloc_pages_nodemask(gfp, order, |
Andi Kleen | 5c4b4be | 2011-03-04 17:36:32 -0800 | [diff] [blame] | 1916 | policy_zonelist(gfp, pol, numa_node_id()), |
| 1917 | policy_nodemask(gfp, pol)); |
Miao Xie | c0ff745 | 2010-05-24 14:32:08 -0700 | [diff] [blame] | 1918 | put_mems_allowed(); |
| 1919 | return page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1920 | } |
| 1921 | EXPORT_SYMBOL(alloc_pages_current); |
| 1922 | |
Paul Jackson | 4225399 | 2006-01-08 01:01:59 -0800 | [diff] [blame] | 1923 | /* |
Lee Schermerhorn | 846a16b | 2008-04-28 02:13:09 -0700 | [diff] [blame] | 1924 | * If mpol_dup() sees current->cpuset == cpuset_being_rebound, then it |
Paul Jackson | 4225399 | 2006-01-08 01:01:59 -0800 | [diff] [blame] | 1925 | * rebinds the mempolicy its copying by calling mpol_rebind_policy() |
| 1926 | * with the mems_allowed returned by cpuset_mems_allowed(). This |
| 1927 | * keeps mempolicies cpuset relative after its cpuset moves. See |
| 1928 | * further kernel/cpuset.c update_nodemask(). |
Miao Xie | 708c1bb | 2010-05-24 14:32:07 -0700 | [diff] [blame] | 1929 | * |
| 1930 | * current's mempolicy may be rebinded by the other task(the task that changes |
| 1931 | * 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] | 1932 | */ |
Paul Jackson | 4225399 | 2006-01-08 01:01:59 -0800 | [diff] [blame] | 1933 | |
Lee Schermerhorn | 846a16b | 2008-04-28 02:13:09 -0700 | [diff] [blame] | 1934 | /* Slow path of a mempolicy duplicate */ |
| 1935 | struct mempolicy *__mpol_dup(struct mempolicy *old) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1936 | { |
| 1937 | struct mempolicy *new = kmem_cache_alloc(policy_cache, GFP_KERNEL); |
| 1938 | |
| 1939 | if (!new) |
| 1940 | return ERR_PTR(-ENOMEM); |
Miao Xie | 708c1bb | 2010-05-24 14:32:07 -0700 | [diff] [blame] | 1941 | |
| 1942 | /* task's mempolicy is protected by alloc_lock */ |
| 1943 | if (old == current->mempolicy) { |
| 1944 | task_lock(current); |
| 1945 | *new = *old; |
| 1946 | task_unlock(current); |
| 1947 | } else |
| 1948 | *new = *old; |
| 1949 | |
Paul E. McKenney | 99ee4ca | 2010-03-03 17:50:17 -0800 | [diff] [blame] | 1950 | rcu_read_lock(); |
Paul Jackson | 4225399 | 2006-01-08 01:01:59 -0800 | [diff] [blame] | 1951 | if (current_cpuset_is_being_rebound()) { |
| 1952 | nodemask_t mems = cpuset_mems_allowed(current); |
Miao Xie | 708c1bb | 2010-05-24 14:32:07 -0700 | [diff] [blame] | 1953 | if (new->flags & MPOL_F_REBINDING) |
| 1954 | mpol_rebind_policy(new, &mems, MPOL_REBIND_STEP2); |
| 1955 | else |
| 1956 | mpol_rebind_policy(new, &mems, MPOL_REBIND_ONCE); |
Paul Jackson | 4225399 | 2006-01-08 01:01:59 -0800 | [diff] [blame] | 1957 | } |
Paul E. McKenney | 99ee4ca | 2010-03-03 17:50:17 -0800 | [diff] [blame] | 1958 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1959 | atomic_set(&new->refcnt, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1960 | return new; |
| 1961 | } |
| 1962 | |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1963 | /* |
| 1964 | * If *frompol needs [has] an extra ref, copy *frompol to *tompol , |
| 1965 | * eliminate the * MPOL_F_* flags that require conditional ref and |
| 1966 | * [NOTE!!!] drop the extra ref. Not safe to reference *frompol directly |
| 1967 | * after return. Use the returned value. |
| 1968 | * |
| 1969 | * Allows use of a mempolicy for, e.g., multiple allocations with a single |
| 1970 | * policy lookup, even if the policy needs/has extra ref on lookup. |
| 1971 | * shmem_readahead needs this. |
| 1972 | */ |
| 1973 | struct mempolicy *__mpol_cond_copy(struct mempolicy *tompol, |
| 1974 | struct mempolicy *frompol) |
| 1975 | { |
| 1976 | if (!mpol_needs_cond_ref(frompol)) |
| 1977 | return frompol; |
| 1978 | |
| 1979 | *tompol = *frompol; |
| 1980 | tompol->flags &= ~MPOL_F_SHARED; /* copy doesn't need unref */ |
| 1981 | __mpol_put(frompol); |
| 1982 | return tompol; |
| 1983 | } |
| 1984 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1985 | /* Slow path of a mempolicy comparison */ |
KOSAKI Motohiro | fcfb4dc | 2012-01-10 15:08:21 -0800 | [diff] [blame] | 1986 | bool __mpol_equal(struct mempolicy *a, struct mempolicy *b) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1987 | { |
| 1988 | if (!a || !b) |
KOSAKI Motohiro | fcfb4dc | 2012-01-10 15:08:21 -0800 | [diff] [blame] | 1989 | return false; |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 1990 | if (a->mode != b->mode) |
KOSAKI Motohiro | fcfb4dc | 2012-01-10 15:08:21 -0800 | [diff] [blame] | 1991 | return false; |
Bob Liu | 1980050 | 2010-05-24 14:32:01 -0700 | [diff] [blame] | 1992 | if (a->flags != b->flags) |
KOSAKI Motohiro | fcfb4dc | 2012-01-10 15:08:21 -0800 | [diff] [blame] | 1993 | return false; |
Bob Liu | 1980050 | 2010-05-24 14:32:01 -0700 | [diff] [blame] | 1994 | if (mpol_store_user_nodemask(a)) |
| 1995 | if (!nodes_equal(a->w.user_nodemask, b->w.user_nodemask)) |
KOSAKI Motohiro | fcfb4dc | 2012-01-10 15:08:21 -0800 | [diff] [blame] | 1996 | return false; |
Bob Liu | 1980050 | 2010-05-24 14:32:01 -0700 | [diff] [blame] | 1997 | |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 1998 | switch (a->mode) { |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1999 | case MPOL_BIND: |
| 2000 | /* Fall through */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2001 | case MPOL_INTERLEAVE: |
KOSAKI Motohiro | fcfb4dc | 2012-01-10 15:08:21 -0800 | [diff] [blame] | 2002 | return !!nodes_equal(a->v.nodes, b->v.nodes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2003 | case MPOL_PREFERRED: |
Namhyung Kim | 7571966 | 2011-03-22 16:33:02 -0700 | [diff] [blame] | 2004 | return a->v.preferred_node == b->v.preferred_node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2005 | default: |
| 2006 | BUG(); |
KOSAKI Motohiro | fcfb4dc | 2012-01-10 15:08:21 -0800 | [diff] [blame] | 2007 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2008 | } |
| 2009 | } |
| 2010 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2011 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2012 | * Shared memory backing store policy support. |
| 2013 | * |
| 2014 | * Remember policies even when nobody has shared memory mapped. |
| 2015 | * The policies are kept in Red-Black tree linked from the inode. |
| 2016 | * They are protected by the sp->lock spinlock, which should be held |
| 2017 | * for any accesses to the tree. |
| 2018 | */ |
| 2019 | |
| 2020 | /* lookup first element intersecting start-end */ |
| 2021 | /* Caller holds sp->lock */ |
| 2022 | static struct sp_node * |
| 2023 | sp_lookup(struct shared_policy *sp, unsigned long start, unsigned long end) |
| 2024 | { |
| 2025 | struct rb_node *n = sp->root.rb_node; |
| 2026 | |
| 2027 | while (n) { |
| 2028 | struct sp_node *p = rb_entry(n, struct sp_node, nd); |
| 2029 | |
| 2030 | if (start >= p->end) |
| 2031 | n = n->rb_right; |
| 2032 | else if (end <= p->start) |
| 2033 | n = n->rb_left; |
| 2034 | else |
| 2035 | break; |
| 2036 | } |
| 2037 | if (!n) |
| 2038 | return NULL; |
| 2039 | for (;;) { |
| 2040 | struct sp_node *w = NULL; |
| 2041 | struct rb_node *prev = rb_prev(n); |
| 2042 | if (!prev) |
| 2043 | break; |
| 2044 | w = rb_entry(prev, struct sp_node, nd); |
| 2045 | if (w->end <= start) |
| 2046 | break; |
| 2047 | n = prev; |
| 2048 | } |
| 2049 | return rb_entry(n, struct sp_node, nd); |
| 2050 | } |
| 2051 | |
| 2052 | /* Insert a new shared policy into the list. */ |
| 2053 | /* Caller holds sp->lock */ |
| 2054 | static void sp_insert(struct shared_policy *sp, struct sp_node *new) |
| 2055 | { |
| 2056 | struct rb_node **p = &sp->root.rb_node; |
| 2057 | struct rb_node *parent = NULL; |
| 2058 | struct sp_node *nd; |
| 2059 | |
| 2060 | while (*p) { |
| 2061 | parent = *p; |
| 2062 | nd = rb_entry(parent, struct sp_node, nd); |
| 2063 | if (new->start < nd->start) |
| 2064 | p = &(*p)->rb_left; |
| 2065 | else if (new->end > nd->end) |
| 2066 | p = &(*p)->rb_right; |
| 2067 | else |
| 2068 | BUG(); |
| 2069 | } |
| 2070 | rb_link_node(&new->nd, parent, p); |
| 2071 | rb_insert_color(&new->nd, &sp->root); |
Paul Mundt | 140d5a4 | 2007-07-15 23:38:16 -0700 | [diff] [blame] | 2072 | pr_debug("inserting %lx-%lx: %d\n", new->start, new->end, |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 2073 | new->policy ? new->policy->mode : 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2074 | } |
| 2075 | |
| 2076 | /* Find shared policy intersecting idx */ |
| 2077 | struct mempolicy * |
| 2078 | mpol_shared_policy_lookup(struct shared_policy *sp, unsigned long idx) |
| 2079 | { |
| 2080 | struct mempolicy *pol = NULL; |
| 2081 | struct sp_node *sn; |
| 2082 | |
| 2083 | if (!sp->root.rb_node) |
| 2084 | return NULL; |
| 2085 | spin_lock(&sp->lock); |
| 2086 | sn = sp_lookup(sp, idx, idx+1); |
| 2087 | if (sn) { |
| 2088 | mpol_get(sn->policy); |
| 2089 | pol = sn->policy; |
| 2090 | } |
| 2091 | spin_unlock(&sp->lock); |
| 2092 | return pol; |
| 2093 | } |
| 2094 | |
| 2095 | static void sp_delete(struct shared_policy *sp, struct sp_node *n) |
| 2096 | { |
Paul Mundt | 140d5a4 | 2007-07-15 23:38:16 -0700 | [diff] [blame] | 2097 | pr_debug("deleting %lx-l%lx\n", n->start, n->end); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2098 | rb_erase(&n->nd, &sp->root); |
Lee Schermerhorn | f0be3d3 | 2008-04-28 02:13:08 -0700 | [diff] [blame] | 2099 | mpol_put(n->policy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2100 | kmem_cache_free(sn_cache, n); |
| 2101 | } |
| 2102 | |
Adrian Bunk | dbcb0f1 | 2007-10-16 01:26:26 -0700 | [diff] [blame] | 2103 | static struct sp_node *sp_alloc(unsigned long start, unsigned long end, |
| 2104 | struct mempolicy *pol) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2105 | { |
| 2106 | struct sp_node *n = kmem_cache_alloc(sn_cache, GFP_KERNEL); |
| 2107 | |
| 2108 | if (!n) |
| 2109 | return NULL; |
| 2110 | n->start = start; |
| 2111 | n->end = end; |
| 2112 | mpol_get(pol); |
Lee Schermerhorn | aab0b10 | 2008-04-28 02:13:13 -0700 | [diff] [blame] | 2113 | pol->flags |= MPOL_F_SHARED; /* for unref */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2114 | n->policy = pol; |
| 2115 | return n; |
| 2116 | } |
| 2117 | |
| 2118 | /* Replace a policy range. */ |
| 2119 | static int shared_policy_replace(struct shared_policy *sp, unsigned long start, |
| 2120 | unsigned long end, struct sp_node *new) |
| 2121 | { |
| 2122 | struct sp_node *n, *new2 = NULL; |
| 2123 | |
| 2124 | restart: |
| 2125 | spin_lock(&sp->lock); |
| 2126 | n = sp_lookup(sp, start, end); |
| 2127 | /* Take care of old policies in the same range. */ |
| 2128 | while (n && n->start < end) { |
| 2129 | struct rb_node *next = rb_next(&n->nd); |
| 2130 | if (n->start >= start) { |
| 2131 | if (n->end <= end) |
| 2132 | sp_delete(sp, n); |
| 2133 | else |
| 2134 | n->start = end; |
| 2135 | } else { |
| 2136 | /* Old policy spanning whole new range. */ |
| 2137 | if (n->end > end) { |
| 2138 | if (!new2) { |
| 2139 | spin_unlock(&sp->lock); |
| 2140 | new2 = sp_alloc(end, n->end, n->policy); |
| 2141 | if (!new2) |
| 2142 | return -ENOMEM; |
| 2143 | goto restart; |
| 2144 | } |
| 2145 | n->end = start; |
| 2146 | sp_insert(sp, new2); |
| 2147 | new2 = NULL; |
| 2148 | break; |
| 2149 | } else |
| 2150 | n->end = start; |
| 2151 | } |
| 2152 | if (!next) |
| 2153 | break; |
| 2154 | n = rb_entry(next, struct sp_node, nd); |
| 2155 | } |
| 2156 | if (new) |
| 2157 | sp_insert(sp, new); |
| 2158 | spin_unlock(&sp->lock); |
| 2159 | if (new2) { |
Lee Schermerhorn | f0be3d3 | 2008-04-28 02:13:08 -0700 | [diff] [blame] | 2160 | mpol_put(new2->policy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2161 | kmem_cache_free(sn_cache, new2); |
| 2162 | } |
| 2163 | return 0; |
| 2164 | } |
| 2165 | |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2166 | /** |
| 2167 | * mpol_shared_policy_init - initialize shared policy for inode |
| 2168 | * @sp: pointer to inode shared policy |
| 2169 | * @mpol: struct mempolicy to install |
| 2170 | * |
| 2171 | * Install non-NULL @mpol in inode's shared policy rb-tree. |
| 2172 | * On entry, the current task has a reference on a non-NULL @mpol. |
| 2173 | * This must be released on exit. |
KAMEZAWA Hiroyuki | 4bfc449 | 2009-08-06 15:07:33 -0700 | [diff] [blame] | 2174 | * 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] | 2175 | */ |
| 2176 | void mpol_shared_policy_init(struct shared_policy *sp, struct mempolicy *mpol) |
Robin Holt | 7339ff8 | 2006-01-14 13:20:48 -0800 | [diff] [blame] | 2177 | { |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 2178 | int ret; |
| 2179 | |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2180 | sp->root = RB_ROOT; /* empty tree == default mempolicy */ |
| 2181 | spin_lock_init(&sp->lock); |
Robin Holt | 7339ff8 | 2006-01-14 13:20:48 -0800 | [diff] [blame] | 2182 | |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2183 | if (mpol) { |
| 2184 | struct vm_area_struct pvma; |
| 2185 | struct mempolicy *new; |
KAMEZAWA Hiroyuki | 4bfc449 | 2009-08-06 15:07:33 -0700 | [diff] [blame] | 2186 | NODEMASK_SCRATCH(scratch); |
Robin Holt | 7339ff8 | 2006-01-14 13:20:48 -0800 | [diff] [blame] | 2187 | |
KAMEZAWA Hiroyuki | 4bfc449 | 2009-08-06 15:07:33 -0700 | [diff] [blame] | 2188 | if (!scratch) |
Lee Schermerhorn | 5c0c165 | 2010-06-29 15:05:30 -0700 | [diff] [blame] | 2189 | goto put_mpol; |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2190 | /* contextualize the tmpfs mount point mempolicy */ |
| 2191 | new = mpol_new(mpol->mode, mpol->flags, &mpol->w.user_nodemask); |
Lee Schermerhorn | 15d7783 | 2010-05-24 14:32:04 -0700 | [diff] [blame] | 2192 | if (IS_ERR(new)) |
Dan Carpenter | 0cae345 | 2010-05-25 23:42:58 -0700 | [diff] [blame] | 2193 | goto free_scratch; /* no valid nodemask intersection */ |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 2194 | |
| 2195 | task_lock(current); |
KAMEZAWA Hiroyuki | 4bfc449 | 2009-08-06 15:07:33 -0700 | [diff] [blame] | 2196 | ret = mpol_set_nodemask(new, &mpol->w.user_nodemask, scratch); |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 2197 | task_unlock(current); |
Lee Schermerhorn | 15d7783 | 2010-05-24 14:32:04 -0700 | [diff] [blame] | 2198 | if (ret) |
Lee Schermerhorn | 5c0c165 | 2010-06-29 15:05:30 -0700 | [diff] [blame] | 2199 | goto put_new; |
Robin Holt | 7339ff8 | 2006-01-14 13:20:48 -0800 | [diff] [blame] | 2200 | |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2201 | /* Create pseudo-vma that contains just the policy */ |
| 2202 | memset(&pvma, 0, sizeof(struct vm_area_struct)); |
| 2203 | pvma.vm_end = TASK_SIZE; /* policy covers entire file */ |
| 2204 | mpol_set_shared_policy(sp, &pvma, new); /* adds ref */ |
Lee Schermerhorn | 15d7783 | 2010-05-24 14:32:04 -0700 | [diff] [blame] | 2205 | |
Lee Schermerhorn | 5c0c165 | 2010-06-29 15:05:30 -0700 | [diff] [blame] | 2206 | put_new: |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2207 | mpol_put(new); /* drop initial ref */ |
Dan Carpenter | 0cae345 | 2010-05-25 23:42:58 -0700 | [diff] [blame] | 2208 | free_scratch: |
KAMEZAWA Hiroyuki | 4bfc449 | 2009-08-06 15:07:33 -0700 | [diff] [blame] | 2209 | NODEMASK_SCRATCH_FREE(scratch); |
Lee Schermerhorn | 5c0c165 | 2010-06-29 15:05:30 -0700 | [diff] [blame] | 2210 | put_mpol: |
| 2211 | mpol_put(mpol); /* drop our incoming ref on sb mpol */ |
Robin Holt | 7339ff8 | 2006-01-14 13:20:48 -0800 | [diff] [blame] | 2212 | } |
| 2213 | } |
| 2214 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2215 | int mpol_set_shared_policy(struct shared_policy *info, |
| 2216 | struct vm_area_struct *vma, struct mempolicy *npol) |
| 2217 | { |
| 2218 | int err; |
| 2219 | struct sp_node *new = NULL; |
| 2220 | unsigned long sz = vma_pages(vma); |
| 2221 | |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 2222 | pr_debug("set_shared_policy %lx sz %lu %d %d %lx\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2223 | vma->vm_pgoff, |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 2224 | sz, npol ? npol->mode : -1, |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 2225 | npol ? npol->flags : -1, |
Paul Mundt | 140d5a4 | 2007-07-15 23:38:16 -0700 | [diff] [blame] | 2226 | npol ? nodes_addr(npol->v.nodes)[0] : -1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2227 | |
| 2228 | if (npol) { |
| 2229 | new = sp_alloc(vma->vm_pgoff, vma->vm_pgoff + sz, npol); |
| 2230 | if (!new) |
| 2231 | return -ENOMEM; |
| 2232 | } |
| 2233 | err = shared_policy_replace(info, vma->vm_pgoff, vma->vm_pgoff+sz, new); |
| 2234 | if (err && new) |
| 2235 | kmem_cache_free(sn_cache, new); |
| 2236 | return err; |
| 2237 | } |
| 2238 | |
| 2239 | /* Free a backing policy store on inode delete. */ |
| 2240 | void mpol_free_shared_policy(struct shared_policy *p) |
| 2241 | { |
| 2242 | struct sp_node *n; |
| 2243 | struct rb_node *next; |
| 2244 | |
| 2245 | if (!p->root.rb_node) |
| 2246 | return; |
| 2247 | spin_lock(&p->lock); |
| 2248 | next = rb_first(&p->root); |
| 2249 | while (next) { |
| 2250 | n = rb_entry(next, struct sp_node, nd); |
| 2251 | next = rb_next(&n->nd); |
Andi Kleen | 90c5029 | 2005-07-27 11:43:50 -0700 | [diff] [blame] | 2252 | rb_erase(&n->nd, &p->root); |
Lee Schermerhorn | f0be3d3 | 2008-04-28 02:13:08 -0700 | [diff] [blame] | 2253 | mpol_put(n->policy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2254 | kmem_cache_free(sn_cache, n); |
| 2255 | } |
| 2256 | spin_unlock(&p->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2257 | } |
| 2258 | |
| 2259 | /* assumes fs == KERNEL_DS */ |
| 2260 | void __init numa_policy_init(void) |
| 2261 | { |
Paul Mundt | b71636e | 2007-07-15 23:38:15 -0700 | [diff] [blame] | 2262 | nodemask_t interleave_nodes; |
| 2263 | unsigned long largest = 0; |
| 2264 | int nid, prefer = 0; |
| 2265 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2266 | policy_cache = kmem_cache_create("numa_policy", |
| 2267 | sizeof(struct mempolicy), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 2268 | 0, SLAB_PANIC, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2269 | |
| 2270 | sn_cache = kmem_cache_create("shared_policy_node", |
| 2271 | sizeof(struct sp_node), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 2272 | 0, SLAB_PANIC, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2273 | |
Paul Mundt | b71636e | 2007-07-15 23:38:15 -0700 | [diff] [blame] | 2274 | /* |
| 2275 | * Set interleaving policy for system init. Interleaving is only |
| 2276 | * enabled across suitably sized nodes (default is >= 16MB), or |
| 2277 | * fall back to the largest node if they're all smaller. |
| 2278 | */ |
| 2279 | nodes_clear(interleave_nodes); |
Christoph Lameter | 56bbd65 | 2007-10-16 01:25:35 -0700 | [diff] [blame] | 2280 | for_each_node_state(nid, N_HIGH_MEMORY) { |
Paul Mundt | b71636e | 2007-07-15 23:38:15 -0700 | [diff] [blame] | 2281 | unsigned long total_pages = node_present_pages(nid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2282 | |
Paul Mundt | b71636e | 2007-07-15 23:38:15 -0700 | [diff] [blame] | 2283 | /* Preserve the largest node */ |
| 2284 | if (largest < total_pages) { |
| 2285 | largest = total_pages; |
| 2286 | prefer = nid; |
| 2287 | } |
| 2288 | |
| 2289 | /* Interleave this node? */ |
| 2290 | if ((total_pages << PAGE_SHIFT) >= (16 << 20)) |
| 2291 | node_set(nid, interleave_nodes); |
| 2292 | } |
| 2293 | |
| 2294 | /* All too small, use the largest */ |
| 2295 | if (unlikely(nodes_empty(interleave_nodes))) |
| 2296 | node_set(prefer, interleave_nodes); |
| 2297 | |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 2298 | if (do_set_mempolicy(MPOL_INTERLEAVE, 0, &interleave_nodes)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2299 | printk("numa_policy_init: interleaving failed\n"); |
| 2300 | } |
| 2301 | |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 2302 | /* Reset policy of current process to default */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2303 | void numa_default_policy(void) |
| 2304 | { |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 2305 | do_set_mempolicy(MPOL_DEFAULT, 0, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2306 | } |
Paul Jackson | 68860ec | 2005-10-30 15:02:36 -0800 | [diff] [blame] | 2307 | |
Paul Jackson | 4225399 | 2006-01-08 01:01:59 -0800 | [diff] [blame] | 2308 | /* |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2309 | * Parse and format mempolicy from/to strings |
| 2310 | */ |
| 2311 | |
| 2312 | /* |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 2313 | * "local" is pseudo-policy: MPOL_PREFERRED with MPOL_F_LOCAL flag |
Lee Schermerhorn | 3f226aa | 2008-04-28 02:13:24 -0700 | [diff] [blame] | 2314 | * Used only for mpol_parse_str() and mpol_to_str() |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2315 | */ |
Lee Schermerhorn | 345ace9 | 2010-05-24 14:32:04 -0700 | [diff] [blame] | 2316 | #define MPOL_LOCAL MPOL_MAX |
| 2317 | static const char * const policy_modes[] = |
| 2318 | { |
| 2319 | [MPOL_DEFAULT] = "default", |
| 2320 | [MPOL_PREFERRED] = "prefer", |
| 2321 | [MPOL_BIND] = "bind", |
| 2322 | [MPOL_INTERLEAVE] = "interleave", |
| 2323 | [MPOL_LOCAL] = "local" |
| 2324 | }; |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2325 | |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2326 | |
| 2327 | #ifdef CONFIG_TMPFS |
| 2328 | /** |
| 2329 | * mpol_parse_str - parse string to mempolicy |
| 2330 | * @str: string containing mempolicy to parse |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2331 | * @mpol: pointer to struct mempolicy pointer, returned on success. |
| 2332 | * @no_context: flag whether to "contextualize" the mempolicy |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2333 | * |
| 2334 | * Format of input: |
| 2335 | * <mode>[=<flags>][:<nodelist>] |
| 2336 | * |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2337 | * if @no_context is true, save the input nodemask in w.user_nodemask in |
| 2338 | * the returned mempolicy. This will be used to "clone" the mempolicy in |
| 2339 | * a specific context [cpuset] at a later time. Used to parse tmpfs mpol |
| 2340 | * mount option. Note that if 'static' or 'relative' mode flags were |
| 2341 | * specified, the input nodemask will already have been saved. Saving |
| 2342 | * it again is redundant, but safe. |
| 2343 | * |
| 2344 | * On success, returns 0, else 1 |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2345 | */ |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2346 | int mpol_parse_str(char *str, struct mempolicy **mpol, int no_context) |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2347 | { |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2348 | struct mempolicy *new = NULL; |
Lee Schermerhorn | b4652e8 | 2010-05-24 14:32:03 -0700 | [diff] [blame] | 2349 | unsigned short mode; |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2350 | unsigned short uninitialized_var(mode_flags); |
| 2351 | nodemask_t nodes; |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2352 | char *nodelist = strchr(str, ':'); |
| 2353 | char *flags = strchr(str, '='); |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2354 | int err = 1; |
| 2355 | |
| 2356 | if (nodelist) { |
| 2357 | /* NUL-terminate mode or flags string */ |
| 2358 | *nodelist++ = '\0'; |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2359 | if (nodelist_parse(nodelist, nodes)) |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2360 | goto out; |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2361 | if (!nodes_subset(nodes, node_states[N_HIGH_MEMORY])) |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2362 | goto out; |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2363 | } else |
| 2364 | nodes_clear(nodes); |
| 2365 | |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2366 | if (flags) |
| 2367 | *flags++ = '\0'; /* terminate mode string */ |
| 2368 | |
Lee Schermerhorn | b4652e8 | 2010-05-24 14:32:03 -0700 | [diff] [blame] | 2369 | for (mode = 0; mode <= MPOL_LOCAL; mode++) { |
Lee Schermerhorn | 345ace9 | 2010-05-24 14:32:04 -0700 | [diff] [blame] | 2370 | if (!strcmp(str, policy_modes[mode])) { |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2371 | break; |
| 2372 | } |
| 2373 | } |
Lee Schermerhorn | b4652e8 | 2010-05-24 14:32:03 -0700 | [diff] [blame] | 2374 | if (mode > MPOL_LOCAL) |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2375 | goto out; |
| 2376 | |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2377 | switch (mode) { |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2378 | case MPOL_PREFERRED: |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2379 | /* |
| 2380 | * Insist on a nodelist of one node only |
| 2381 | */ |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2382 | if (nodelist) { |
| 2383 | char *rest = nodelist; |
| 2384 | while (isdigit(*rest)) |
| 2385 | rest++; |
KOSAKI Motohiro | 926f2ae | 2010-03-23 13:35:32 -0700 | [diff] [blame] | 2386 | if (*rest) |
| 2387 | goto out; |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2388 | } |
| 2389 | break; |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2390 | case MPOL_INTERLEAVE: |
| 2391 | /* |
| 2392 | * Default to online nodes with memory if no nodelist |
| 2393 | */ |
| 2394 | if (!nodelist) |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2395 | nodes = node_states[N_HIGH_MEMORY]; |
Lee Schermerhorn | 3f226aa | 2008-04-28 02:13:24 -0700 | [diff] [blame] | 2396 | break; |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2397 | case MPOL_LOCAL: |
Lee Schermerhorn | 3f226aa | 2008-04-28 02:13:24 -0700 | [diff] [blame] | 2398 | /* |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2399 | * Don't allow a nodelist; mpol_new() checks flags |
Lee Schermerhorn | 3f226aa | 2008-04-28 02:13:24 -0700 | [diff] [blame] | 2400 | */ |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2401 | if (nodelist) |
Lee Schermerhorn | 3f226aa | 2008-04-28 02:13:24 -0700 | [diff] [blame] | 2402 | goto out; |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2403 | mode = MPOL_PREFERRED; |
Lee Schermerhorn | 3f226aa | 2008-04-28 02:13:24 -0700 | [diff] [blame] | 2404 | break; |
Ravikiran G Thirumalai | 413b43d | 2010-03-23 13:35:28 -0700 | [diff] [blame] | 2405 | case MPOL_DEFAULT: |
| 2406 | /* |
| 2407 | * Insist on a empty nodelist |
| 2408 | */ |
| 2409 | if (!nodelist) |
| 2410 | err = 0; |
| 2411 | goto out; |
KOSAKI Motohiro | d69b2e6 | 2010-03-23 13:35:30 -0700 | [diff] [blame] | 2412 | case MPOL_BIND: |
| 2413 | /* |
| 2414 | * Insist on a nodelist |
| 2415 | */ |
| 2416 | if (!nodelist) |
| 2417 | goto out; |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2418 | } |
| 2419 | |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2420 | mode_flags = 0; |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2421 | if (flags) { |
| 2422 | /* |
| 2423 | * Currently, we only support two mutually exclusive |
| 2424 | * mode flags. |
| 2425 | */ |
| 2426 | if (!strcmp(flags, "static")) |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2427 | mode_flags |= MPOL_F_STATIC_NODES; |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2428 | else if (!strcmp(flags, "relative")) |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2429 | mode_flags |= MPOL_F_RELATIVE_NODES; |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2430 | else |
KOSAKI Motohiro | 926f2ae | 2010-03-23 13:35:32 -0700 | [diff] [blame] | 2431 | goto out; |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2432 | } |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2433 | |
| 2434 | new = mpol_new(mode, mode_flags, &nodes); |
| 2435 | if (IS_ERR(new)) |
KOSAKI Motohiro | 926f2ae | 2010-03-23 13:35:32 -0700 | [diff] [blame] | 2436 | goto out; |
| 2437 | |
Lee Schermerhorn | e17f74a | 2010-05-24 14:32:02 -0700 | [diff] [blame] | 2438 | if (no_context) { |
| 2439 | /* save for contextualization */ |
| 2440 | new->w.user_nodemask = nodes; |
| 2441 | } else { |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 2442 | int ret; |
KAMEZAWA Hiroyuki | 4bfc449 | 2009-08-06 15:07:33 -0700 | [diff] [blame] | 2443 | NODEMASK_SCRATCH(scratch); |
| 2444 | if (scratch) { |
| 2445 | task_lock(current); |
| 2446 | ret = mpol_set_nodemask(new, &nodes, scratch); |
| 2447 | task_unlock(current); |
| 2448 | } else |
| 2449 | ret = -ENOMEM; |
| 2450 | NODEMASK_SCRATCH_FREE(scratch); |
| 2451 | if (ret) { |
KAMEZAWA Hiroyuki | 4bfc449 | 2009-08-06 15:07:33 -0700 | [diff] [blame] | 2452 | mpol_put(new); |
KOSAKI Motohiro | 926f2ae | 2010-03-23 13:35:32 -0700 | [diff] [blame] | 2453 | goto out; |
Miao Xie | 58568d2 | 2009-06-16 15:31:49 -0700 | [diff] [blame] | 2454 | } |
| 2455 | } |
KOSAKI Motohiro | 926f2ae | 2010-03-23 13:35:32 -0700 | [diff] [blame] | 2456 | err = 0; |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2457 | |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2458 | out: |
| 2459 | /* Restore string for error message */ |
| 2460 | if (nodelist) |
| 2461 | *--nodelist = ':'; |
| 2462 | if (flags) |
| 2463 | *--flags = '='; |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2464 | if (!err) |
| 2465 | *mpol = new; |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2466 | return err; |
| 2467 | } |
| 2468 | #endif /* CONFIG_TMPFS */ |
| 2469 | |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2470 | /** |
| 2471 | * mpol_to_str - format a mempolicy structure for printing |
| 2472 | * @buffer: to contain formatted mempolicy string |
| 2473 | * @maxlen: length of @buffer |
| 2474 | * @pol: pointer to mempolicy to be formatted |
| 2475 | * @no_context: "context free" mempolicy - use nodemask in w.user_nodemask |
| 2476 | * |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2477 | * Convert a mempolicy into a string. |
| 2478 | * Returns the number of characters in buffer (if positive) |
| 2479 | * or an error (negative) |
| 2480 | */ |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2481 | int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol, int no_context) |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2482 | { |
| 2483 | char *p = buffer; |
| 2484 | int l; |
| 2485 | nodemask_t nodes; |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 2486 | unsigned short mode; |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 2487 | unsigned short flags = pol ? pol->flags : 0; |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2488 | |
Lee Schermerhorn | 2291990 | 2008-04-28 02:13:22 -0700 | [diff] [blame] | 2489 | /* |
| 2490 | * Sanity check: room for longest mode, flag and some nodes |
| 2491 | */ |
| 2492 | VM_BUG_ON(maxlen < strlen("interleave") + strlen("relative") + 16); |
| 2493 | |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 2494 | if (!pol || pol == &default_policy) |
| 2495 | mode = MPOL_DEFAULT; |
| 2496 | else |
| 2497 | mode = pol->mode; |
| 2498 | |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2499 | switch (mode) { |
| 2500 | case MPOL_DEFAULT: |
| 2501 | nodes_clear(nodes); |
| 2502 | break; |
| 2503 | |
| 2504 | case MPOL_PREFERRED: |
| 2505 | nodes_clear(nodes); |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 2506 | if (flags & MPOL_F_LOCAL) |
Lee Schermerhorn | 53f2556 | 2008-04-28 02:13:20 -0700 | [diff] [blame] | 2507 | mode = MPOL_LOCAL; /* pseudo-policy */ |
| 2508 | else |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 2509 | node_set(pol->v.preferred_node, nodes); |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2510 | break; |
| 2511 | |
| 2512 | case MPOL_BIND: |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 2513 | /* Fall through */ |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2514 | case MPOL_INTERLEAVE: |
Lee Schermerhorn | 71fe804 | 2008-04-28 02:13:26 -0700 | [diff] [blame] | 2515 | if (no_context) |
| 2516 | nodes = pol->w.user_nodemask; |
| 2517 | else |
| 2518 | nodes = pol->v.nodes; |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2519 | break; |
| 2520 | |
| 2521 | default: |
| 2522 | BUG(); |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2523 | } |
| 2524 | |
Lee Schermerhorn | 345ace9 | 2010-05-24 14:32:04 -0700 | [diff] [blame] | 2525 | l = strlen(policy_modes[mode]); |
Lee Schermerhorn | 53f2556 | 2008-04-28 02:13:20 -0700 | [diff] [blame] | 2526 | if (buffer + maxlen < p + l + 1) |
| 2527 | return -ENOSPC; |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2528 | |
Lee Schermerhorn | 345ace9 | 2010-05-24 14:32:04 -0700 | [diff] [blame] | 2529 | strcpy(p, policy_modes[mode]); |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2530 | p += l; |
| 2531 | |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 2532 | if (flags & MPOL_MODE_FLAGS) { |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 2533 | if (buffer + maxlen < p + 2) |
| 2534 | return -ENOSPC; |
| 2535 | *p++ = '='; |
| 2536 | |
Lee Schermerhorn | 2291990 | 2008-04-28 02:13:22 -0700 | [diff] [blame] | 2537 | /* |
| 2538 | * Currently, the only defined flags are mutually exclusive |
| 2539 | */ |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 2540 | if (flags & MPOL_F_STATIC_NODES) |
Lee Schermerhorn | 2291990 | 2008-04-28 02:13:22 -0700 | [diff] [blame] | 2541 | p += snprintf(p, buffer + maxlen - p, "static"); |
| 2542 | else if (flags & MPOL_F_RELATIVE_NODES) |
| 2543 | p += snprintf(p, buffer + maxlen - p, "relative"); |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 2544 | } |
| 2545 | |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2546 | if (!nodes_empty(nodes)) { |
| 2547 | if (buffer + maxlen < p + 2) |
| 2548 | return -ENOSPC; |
Lee Schermerhorn | 095f1fc | 2008-04-28 02:13:23 -0700 | [diff] [blame] | 2549 | *p++ = ':'; |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2550 | p += nodelist_scnprintf(p, buffer + maxlen - p, nodes); |
| 2551 | } |
| 2552 | return p - buffer; |
| 2553 | } |