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> |
| 76 | #include <linux/gfp.h> |
| 77 | #include <linux/slab.h> |
| 78 | #include <linux/string.h> |
| 79 | #include <linux/module.h> |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 80 | #include <linux/nsproxy.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | #include <linux/interrupt.h> |
| 82 | #include <linux/init.h> |
| 83 | #include <linux/compat.h> |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 84 | #include <linux/swap.h> |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 85 | #include <linux/seq_file.h> |
| 86 | #include <linux/proc_fs.h> |
Christoph Lameter | b20a350 | 2006-03-22 00:09:12 -0800 | [diff] [blame] | 87 | #include <linux/migrate.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> |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 91 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | #include <asm/tlbflush.h> |
| 93 | #include <asm/uaccess.h> |
| 94 | |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 95 | /* Internal flags */ |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 96 | #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] | 97 | #define MPOL_MF_INVERT (MPOL_MF_INTERNAL << 1) /* Invert check for nodemask */ |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 98 | #define MPOL_MF_STATS (MPOL_MF_INTERNAL << 2) /* Gather statistics */ |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 99 | |
Pekka Enberg | fcc234f | 2006-03-22 00:08:13 -0800 | [diff] [blame] | 100 | static struct kmem_cache *policy_cache; |
| 101 | static struct kmem_cache *sn_cache; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | /* Highest zone. An specific allocation for a zone below that is not |
| 104 | policied. */ |
Christoph Lameter | 6267276 | 2007-02-10 01:43:07 -0800 | [diff] [blame] | 105 | enum zone_type policy_zone = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 107 | /* |
| 108 | * run-time system-wide default policy => local allocation |
| 109 | */ |
Andi Kleen | d42c699 | 2005-07-06 19:56:03 +0200 | [diff] [blame] | 110 | struct mempolicy default_policy = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | .refcnt = ATOMIC_INIT(1), /* never free it */ |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 112 | .mode = MPOL_PREFERRED, |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 113 | .flags = MPOL_F_LOCAL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | }; |
| 115 | |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 116 | static const struct mempolicy_operations { |
| 117 | int (*create)(struct mempolicy *pol, const nodemask_t *nodes); |
| 118 | void (*rebind)(struct mempolicy *pol, const nodemask_t *nodes); |
| 119 | } mpol_ops[MPOL_MAX]; |
| 120 | |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 121 | /* Check that the nodemask contains at least one populated zone */ |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 122 | static int is_valid_nodemask(const nodemask_t *nodemask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | { |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 124 | int nd, k; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 126 | /* Check that there is something useful in this mask */ |
| 127 | k = policy_zone; |
| 128 | |
| 129 | for_each_node_mask(nd, *nodemask) { |
| 130 | struct zone *z; |
| 131 | |
| 132 | for (k = 0; k <= policy_zone; k++) { |
| 133 | z = &NODE_DATA(nd)->node_zones[k]; |
| 134 | if (z->present_pages > 0) |
| 135 | return 1; |
Andi Kleen | dd942ae | 2006-02-17 01:39:16 +0100 | [diff] [blame] | 136 | } |
| 137 | } |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 138 | |
| 139 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | } |
| 141 | |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 142 | static inline int mpol_store_user_nodemask(const struct mempolicy *pol) |
| 143 | { |
David Rientjes | 4c50bc0 | 2008-04-28 02:12:30 -0700 | [diff] [blame] | 144 | return pol->flags & (MPOL_F_STATIC_NODES | MPOL_F_RELATIVE_NODES); |
| 145 | } |
| 146 | |
| 147 | static void mpol_relative_nodemask(nodemask_t *ret, const nodemask_t *orig, |
| 148 | const nodemask_t *rel) |
| 149 | { |
| 150 | nodemask_t tmp; |
| 151 | nodes_fold(tmp, *orig, nodes_weight(*rel)); |
| 152 | nodes_onto(*ret, tmp, *rel); |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 153 | } |
| 154 | |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 155 | static int mpol_new_interleave(struct mempolicy *pol, const nodemask_t *nodes) |
| 156 | { |
| 157 | if (nodes_empty(*nodes)) |
| 158 | return -EINVAL; |
| 159 | pol->v.nodes = *nodes; |
| 160 | return 0; |
| 161 | } |
| 162 | |
| 163 | static int mpol_new_preferred(struct mempolicy *pol, const nodemask_t *nodes) |
| 164 | { |
| 165 | if (!nodes) |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 166 | pol->flags |= MPOL_F_LOCAL; /* local allocation */ |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 167 | else if (nodes_empty(*nodes)) |
| 168 | return -EINVAL; /* no allowed nodes */ |
| 169 | else |
| 170 | pol->v.preferred_node = first_node(*nodes); |
| 171 | return 0; |
| 172 | } |
| 173 | |
| 174 | static int mpol_new_bind(struct mempolicy *pol, const nodemask_t *nodes) |
| 175 | { |
| 176 | if (!is_valid_nodemask(nodes)) |
| 177 | return -EINVAL; |
| 178 | pol->v.nodes = *nodes; |
| 179 | return 0; |
| 180 | } |
| 181 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | /* Create a new policy */ |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 183 | static struct mempolicy *mpol_new(unsigned short mode, unsigned short flags, |
| 184 | nodemask_t *nodes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | { |
| 186 | struct mempolicy *policy; |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 187 | nodemask_t cpuset_context_nmask; |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 188 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 190 | pr_debug("setting mode %d flags %d nodes[0] %lx\n", |
| 191 | mode, flags, nodes ? nodes_addr(*nodes)[0] : -1); |
Paul Mundt | 140d5a4 | 2007-07-15 23:38:16 -0700 | [diff] [blame] | 192 | |
David Rientjes | 3e1f064 | 2008-04-28 02:12:34 -0700 | [diff] [blame] | 193 | if (mode == MPOL_DEFAULT) { |
| 194 | if (nodes && !nodes_empty(*nodes)) |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 195 | return ERR_PTR(-EINVAL); |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 196 | return NULL; /* simply delete any existing policy */ |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 197 | } |
David Rientjes | 3e1f064 | 2008-04-28 02:12:34 -0700 | [diff] [blame] | 198 | VM_BUG_ON(!nodes); |
| 199 | |
| 200 | /* |
| 201 | * MPOL_PREFERRED cannot be used with MPOL_F_STATIC_NODES or |
| 202 | * MPOL_F_RELATIVE_NODES if the nodemask is empty (local allocation). |
| 203 | * All other modes require a valid pointer to a non-empty nodemask. |
| 204 | */ |
| 205 | if (mode == MPOL_PREFERRED) { |
| 206 | if (nodes_empty(*nodes)) { |
| 207 | if (((flags & MPOL_F_STATIC_NODES) || |
| 208 | (flags & MPOL_F_RELATIVE_NODES))) |
| 209 | return ERR_PTR(-EINVAL); |
| 210 | nodes = NULL; /* flag local alloc */ |
| 211 | } |
| 212 | } else if (nodes_empty(*nodes)) |
| 213 | return ERR_PTR(-EINVAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | policy = kmem_cache_alloc(policy_cache, GFP_KERNEL); |
| 215 | if (!policy) |
| 216 | return ERR_PTR(-ENOMEM); |
| 217 | atomic_set(&policy->refcnt, 1); |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 218 | policy->mode = mode; |
David Rientjes | 3e1f064 | 2008-04-28 02:12:34 -0700 | [diff] [blame] | 219 | policy->flags = flags; |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 220 | |
David Rientjes | 3e1f064 | 2008-04-28 02:12:34 -0700 | [diff] [blame] | 221 | if (nodes) { |
| 222 | /* |
| 223 | * cpuset related setup doesn't apply to local allocation |
| 224 | */ |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 225 | cpuset_update_task_memory_state(); |
| 226 | if (flags & MPOL_F_RELATIVE_NODES) |
| 227 | mpol_relative_nodemask(&cpuset_context_nmask, nodes, |
| 228 | &cpuset_current_mems_allowed); |
| 229 | else |
| 230 | nodes_and(cpuset_context_nmask, *nodes, |
| 231 | cpuset_current_mems_allowed); |
| 232 | if (mpol_store_user_nodemask(policy)) |
| 233 | policy->w.user_nodemask = *nodes; |
| 234 | else |
| 235 | policy->w.cpuset_mems_allowed = |
| 236 | cpuset_mems_allowed(current); |
| 237 | } |
| 238 | |
| 239 | ret = mpol_ops[mode].create(policy, |
David Rientjes | 3e1f064 | 2008-04-28 02:12:34 -0700 | [diff] [blame] | 240 | nodes ? &cpuset_context_nmask : NULL); |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 241 | if (ret < 0) { |
| 242 | kmem_cache_free(policy_cache, policy); |
| 243 | return ERR_PTR(ret); |
| 244 | } |
| 245 | return policy; |
| 246 | } |
| 247 | |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 248 | /* Slow path of a mpol destructor. */ |
| 249 | void __mpol_put(struct mempolicy *p) |
| 250 | { |
| 251 | if (!atomic_dec_and_test(&p->refcnt)) |
| 252 | return; |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 253 | kmem_cache_free(policy_cache, p); |
| 254 | } |
| 255 | |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 256 | static void mpol_rebind_default(struct mempolicy *pol, const nodemask_t *nodes) |
| 257 | { |
| 258 | } |
| 259 | |
| 260 | static void mpol_rebind_nodemask(struct mempolicy *pol, |
| 261 | const nodemask_t *nodes) |
| 262 | { |
| 263 | nodemask_t tmp; |
| 264 | |
| 265 | if (pol->flags & MPOL_F_STATIC_NODES) |
| 266 | nodes_and(tmp, pol->w.user_nodemask, *nodes); |
| 267 | else if (pol->flags & MPOL_F_RELATIVE_NODES) |
| 268 | mpol_relative_nodemask(&tmp, &pol->w.user_nodemask, nodes); |
| 269 | else { |
| 270 | nodes_remap(tmp, pol->v.nodes, pol->w.cpuset_mems_allowed, |
| 271 | *nodes); |
| 272 | pol->w.cpuset_mems_allowed = *nodes; |
| 273 | } |
| 274 | |
| 275 | pol->v.nodes = tmp; |
| 276 | if (!node_isset(current->il_next, tmp)) { |
| 277 | current->il_next = next_node(current->il_next, tmp); |
| 278 | if (current->il_next >= MAX_NUMNODES) |
| 279 | current->il_next = first_node(tmp); |
| 280 | if (current->il_next >= MAX_NUMNODES) |
| 281 | current->il_next = numa_node_id(); |
| 282 | } |
| 283 | } |
| 284 | |
| 285 | static void mpol_rebind_preferred(struct mempolicy *pol, |
| 286 | const nodemask_t *nodes) |
| 287 | { |
| 288 | nodemask_t tmp; |
| 289 | |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 290 | if (pol->flags & MPOL_F_STATIC_NODES) { |
| 291 | int node = first_node(pol->w.user_nodemask); |
| 292 | |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 293 | if (node_isset(node, *nodes)) { |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 294 | pol->v.preferred_node = node; |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 295 | pol->flags &= ~MPOL_F_LOCAL; |
| 296 | } else |
| 297 | pol->flags |= MPOL_F_LOCAL; |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 298 | } else if (pol->flags & MPOL_F_RELATIVE_NODES) { |
| 299 | mpol_relative_nodemask(&tmp, &pol->w.user_nodemask, nodes); |
| 300 | pol->v.preferred_node = first_node(tmp); |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 301 | } else if (!(pol->flags & MPOL_F_LOCAL)) { |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 302 | pol->v.preferred_node = node_remap(pol->v.preferred_node, |
| 303 | pol->w.cpuset_mems_allowed, |
| 304 | *nodes); |
| 305 | pol->w.cpuset_mems_allowed = *nodes; |
| 306 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | } |
| 308 | |
David Rientjes | 1d0d268 | 2008-04-28 02:12:32 -0700 | [diff] [blame] | 309 | /* Migrate a policy to a different set of nodes */ |
| 310 | static void mpol_rebind_policy(struct mempolicy *pol, |
| 311 | const nodemask_t *newmask) |
| 312 | { |
David Rientjes | 1d0d268 | 2008-04-28 02:12:32 -0700 | [diff] [blame] | 313 | if (!pol) |
| 314 | return; |
David Rientjes | 1d0d268 | 2008-04-28 02:12:32 -0700 | [diff] [blame] | 315 | if (!mpol_store_user_nodemask(pol) && |
| 316 | nodes_equal(pol->w.cpuset_mems_allowed, *newmask)) |
| 317 | return; |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 318 | mpol_ops[pol->mode].rebind(pol, newmask); |
David Rientjes | 1d0d268 | 2008-04-28 02:12:32 -0700 | [diff] [blame] | 319 | } |
| 320 | |
| 321 | /* |
| 322 | * Wrapper for mpol_rebind_policy() that just requires task |
| 323 | * pointer, and updates task mempolicy. |
| 324 | */ |
| 325 | |
| 326 | void mpol_rebind_task(struct task_struct *tsk, const nodemask_t *new) |
| 327 | { |
| 328 | mpol_rebind_policy(tsk->mempolicy, new); |
| 329 | } |
| 330 | |
| 331 | /* |
| 332 | * Rebind each vma in mm to new nodemask. |
| 333 | * |
| 334 | * Call holding a reference to mm. Takes mm->mmap_sem during call. |
| 335 | */ |
| 336 | |
| 337 | void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new) |
| 338 | { |
| 339 | struct vm_area_struct *vma; |
| 340 | |
| 341 | down_write(&mm->mmap_sem); |
| 342 | for (vma = mm->mmap; vma; vma = vma->vm_next) |
| 343 | mpol_rebind_policy(vma->vm_policy, new); |
| 344 | up_write(&mm->mmap_sem); |
| 345 | } |
| 346 | |
David Rientjes | 3701294 | 2008-04-28 02:12:33 -0700 | [diff] [blame] | 347 | static const struct mempolicy_operations mpol_ops[MPOL_MAX] = { |
| 348 | [MPOL_DEFAULT] = { |
| 349 | .rebind = mpol_rebind_default, |
| 350 | }, |
| 351 | [MPOL_INTERLEAVE] = { |
| 352 | .create = mpol_new_interleave, |
| 353 | .rebind = mpol_rebind_nodemask, |
| 354 | }, |
| 355 | [MPOL_PREFERRED] = { |
| 356 | .create = mpol_new_preferred, |
| 357 | .rebind = mpol_rebind_preferred, |
| 358 | }, |
| 359 | [MPOL_BIND] = { |
| 360 | .create = mpol_new_bind, |
| 361 | .rebind = mpol_rebind_nodemask, |
| 362 | }, |
| 363 | }; |
| 364 | |
Christoph Lameter | 397874d | 2006-03-06 15:42:53 -0800 | [diff] [blame] | 365 | static void gather_stats(struct page *, void *, int pte_dirty); |
Christoph Lameter | fc30128 | 2006-01-18 17:42:29 -0800 | [diff] [blame] | 366 | static void migrate_page_add(struct page *page, struct list_head *pagelist, |
| 367 | unsigned long flags); |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 368 | |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 369 | /* Scan through pages checking if pages follow certain conditions. */ |
Nick Piggin | b581003 | 2005-10-29 18:16:12 -0700 | [diff] [blame] | 370 | 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] | 371 | unsigned long addr, unsigned long end, |
| 372 | const nodemask_t *nodes, unsigned long flags, |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 373 | void *private) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | { |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 375 | pte_t *orig_pte; |
| 376 | pte_t *pte; |
Hugh Dickins | 705e87c | 2005-10-29 18:16:27 -0700 | [diff] [blame] | 377 | spinlock_t *ptl; |
Hugh Dickins | 941150a | 2005-06-21 17:15:06 -0700 | [diff] [blame] | 378 | |
Hugh Dickins | 705e87c | 2005-10-29 18:16:27 -0700 | [diff] [blame] | 379 | 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] | 380 | do { |
Linus Torvalds | 6aab341 | 2005-11-28 14:34:23 -0800 | [diff] [blame] | 381 | struct page *page; |
Andy Whitcroft | 25ba77c | 2006-12-06 20:33:03 -0800 | [diff] [blame] | 382 | int nid; |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 383 | |
| 384 | if (!pte_present(*pte)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | continue; |
Linus Torvalds | 6aab341 | 2005-11-28 14:34:23 -0800 | [diff] [blame] | 386 | page = vm_normal_page(vma, addr, *pte); |
| 387 | if (!page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | continue; |
Nick Piggin | 053837f | 2006-01-18 17:42:27 -0800 | [diff] [blame] | 389 | /* |
| 390 | * The check for PageReserved here is important to avoid |
| 391 | * handling zero pages and other pages that may have been |
| 392 | * marked special by the system. |
| 393 | * |
| 394 | * If the PageReserved would not be checked here then f.e. |
| 395 | * the location of the zero page could have an influence |
| 396 | * on MPOL_MF_STRICT, zero pages would be counted for |
| 397 | * the per node stats, and there would be useless attempts |
| 398 | * to put zero pages on the migration list. |
| 399 | */ |
Christoph Lameter | f4598c8 | 2006-01-12 01:05:20 -0800 | [diff] [blame] | 400 | if (PageReserved(page)) |
| 401 | continue; |
Linus Torvalds | 6aab341 | 2005-11-28 14:34:23 -0800 | [diff] [blame] | 402 | nid = page_to_nid(page); |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 403 | if (node_isset(nid, *nodes) == !!(flags & MPOL_MF_INVERT)) |
| 404 | continue; |
| 405 | |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 406 | if (flags & MPOL_MF_STATS) |
Christoph Lameter | 397874d | 2006-03-06 15:42:53 -0800 | [diff] [blame] | 407 | gather_stats(page, private, pte_dirty(*pte)); |
Nick Piggin | 053837f | 2006-01-18 17:42:27 -0800 | [diff] [blame] | 408 | else if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) |
Christoph Lameter | fc30128 | 2006-01-18 17:42:29 -0800 | [diff] [blame] | 409 | migrate_page_add(page, private, flags); |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 410 | else |
| 411 | break; |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 412 | } while (pte++, addr += PAGE_SIZE, addr != end); |
Hugh Dickins | 705e87c | 2005-10-29 18:16:27 -0700 | [diff] [blame] | 413 | pte_unmap_unlock(orig_pte, ptl); |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 414 | return addr != end; |
| 415 | } |
| 416 | |
Nick Piggin | b581003 | 2005-10-29 18:16:12 -0700 | [diff] [blame] | 417 | 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] | 418 | unsigned long addr, unsigned long end, |
| 419 | const nodemask_t *nodes, unsigned long flags, |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 420 | void *private) |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 421 | { |
| 422 | pmd_t *pmd; |
| 423 | unsigned long next; |
| 424 | |
| 425 | pmd = pmd_offset(pud, addr); |
| 426 | do { |
| 427 | next = pmd_addr_end(addr, end); |
| 428 | if (pmd_none_or_clear_bad(pmd)) |
| 429 | continue; |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 430 | if (check_pte_range(vma, pmd, addr, next, nodes, |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 431 | flags, private)) |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 432 | return -EIO; |
| 433 | } while (pmd++, addr = next, addr != end); |
| 434 | return 0; |
| 435 | } |
| 436 | |
Nick Piggin | b581003 | 2005-10-29 18:16:12 -0700 | [diff] [blame] | 437 | 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] | 438 | unsigned long addr, unsigned long end, |
| 439 | const nodemask_t *nodes, unsigned long flags, |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 440 | void *private) |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 441 | { |
| 442 | pud_t *pud; |
| 443 | unsigned long next; |
| 444 | |
| 445 | pud = pud_offset(pgd, addr); |
| 446 | do { |
| 447 | next = pud_addr_end(addr, end); |
| 448 | if (pud_none_or_clear_bad(pud)) |
| 449 | continue; |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 450 | if (check_pmd_range(vma, pud, addr, next, nodes, |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 451 | flags, private)) |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 452 | return -EIO; |
| 453 | } while (pud++, addr = next, addr != end); |
| 454 | return 0; |
| 455 | } |
| 456 | |
Nick Piggin | b581003 | 2005-10-29 18:16:12 -0700 | [diff] [blame] | 457 | static inline int check_pgd_range(struct vm_area_struct *vma, |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 458 | unsigned long addr, unsigned long end, |
| 459 | const nodemask_t *nodes, unsigned long flags, |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 460 | void *private) |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 461 | { |
| 462 | pgd_t *pgd; |
| 463 | unsigned long next; |
| 464 | |
Nick Piggin | b581003 | 2005-10-29 18:16:12 -0700 | [diff] [blame] | 465 | pgd = pgd_offset(vma->vm_mm, addr); |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 466 | do { |
| 467 | next = pgd_addr_end(addr, end); |
| 468 | if (pgd_none_or_clear_bad(pgd)) |
| 469 | continue; |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 470 | if (check_pud_range(vma, pgd, addr, next, nodes, |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 471 | flags, private)) |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 472 | return -EIO; |
| 473 | } while (pgd++, addr = next, addr != end); |
| 474 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | } |
| 476 | |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 477 | /* |
| 478 | * Check if all pages in a range are on a set of nodes. |
| 479 | * If pagelist != NULL then isolate pages from the LRU and |
| 480 | * put them on the pagelist. |
| 481 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | static struct vm_area_struct * |
| 483 | check_range(struct mm_struct *mm, unsigned long start, unsigned long end, |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 484 | const nodemask_t *nodes, unsigned long flags, void *private) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | { |
| 486 | int err; |
| 487 | struct vm_area_struct *first, *vma, *prev; |
| 488 | |
Christoph Lameter | 90036ee | 2006-03-16 23:03:59 -0800 | [diff] [blame] | 489 | if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) { |
Christoph Lameter | 90036ee | 2006-03-16 23:03:59 -0800 | [diff] [blame] | 490 | |
Christoph Lameter | b20a350 | 2006-03-22 00:09:12 -0800 | [diff] [blame] | 491 | err = migrate_prep(); |
| 492 | if (err) |
| 493 | return ERR_PTR(err); |
Christoph Lameter | 90036ee | 2006-03-16 23:03:59 -0800 | [diff] [blame] | 494 | } |
Nick Piggin | 053837f | 2006-01-18 17:42:27 -0800 | [diff] [blame] | 495 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | first = find_vma(mm, start); |
| 497 | if (!first) |
| 498 | return ERR_PTR(-EFAULT); |
| 499 | prev = NULL; |
| 500 | for (vma = first; vma && vma->vm_start < end; vma = vma->vm_next) { |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 501 | if (!(flags & MPOL_MF_DISCONTIG_OK)) { |
| 502 | if (!vma->vm_next && vma->vm_end < end) |
| 503 | return ERR_PTR(-EFAULT); |
| 504 | if (prev && prev->vm_end < vma->vm_start) |
| 505 | return ERR_PTR(-EFAULT); |
| 506 | } |
| 507 | if (!is_vm_hugetlb_page(vma) && |
| 508 | ((flags & MPOL_MF_STRICT) || |
| 509 | ((flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) && |
| 510 | vma_migratable(vma)))) { |
Andi Kleen | 5b952b3 | 2005-09-13 01:25:08 -0700 | [diff] [blame] | 511 | unsigned long endvma = vma->vm_end; |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 512 | |
Andi Kleen | 5b952b3 | 2005-09-13 01:25:08 -0700 | [diff] [blame] | 513 | if (endvma > end) |
| 514 | endvma = end; |
| 515 | if (vma->vm_start > start) |
| 516 | start = vma->vm_start; |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 517 | err = check_pgd_range(vma, start, endvma, nodes, |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 518 | flags, private); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | if (err) { |
| 520 | first = ERR_PTR(err); |
| 521 | break; |
| 522 | } |
| 523 | } |
| 524 | prev = vma; |
| 525 | } |
| 526 | return first; |
| 527 | } |
| 528 | |
| 529 | /* Apply policy to a single VMA */ |
| 530 | static int policy_vma(struct vm_area_struct *vma, struct mempolicy *new) |
| 531 | { |
| 532 | int err = 0; |
| 533 | struct mempolicy *old = vma->vm_policy; |
| 534 | |
Paul Mundt | 140d5a4 | 2007-07-15 23:38:16 -0700 | [diff] [blame] | 535 | 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] | 536 | vma->vm_start, vma->vm_end, vma->vm_pgoff, |
| 537 | vma->vm_ops, vma->vm_file, |
| 538 | vma->vm_ops ? vma->vm_ops->set_policy : NULL); |
| 539 | |
| 540 | if (vma->vm_ops && vma->vm_ops->set_policy) |
| 541 | err = vma->vm_ops->set_policy(vma, new); |
| 542 | if (!err) { |
| 543 | mpol_get(new); |
| 544 | vma->vm_policy = new; |
Lee Schermerhorn | f0be3d3 | 2008-04-28 02:13:08 -0700 | [diff] [blame] | 545 | mpol_put(old); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | } |
| 547 | return err; |
| 548 | } |
| 549 | |
| 550 | /* Step 2: apply policy to a range and do splits. */ |
| 551 | static int mbind_range(struct vm_area_struct *vma, unsigned long start, |
| 552 | unsigned long end, struct mempolicy *new) |
| 553 | { |
| 554 | struct vm_area_struct *next; |
| 555 | int err; |
| 556 | |
| 557 | err = 0; |
| 558 | for (; vma && vma->vm_start < end; vma = next) { |
| 559 | next = vma->vm_next; |
| 560 | if (vma->vm_start < start) |
| 561 | err = split_vma(vma->vm_mm, vma, start, 1); |
| 562 | if (!err && vma->vm_end > end) |
| 563 | err = split_vma(vma->vm_mm, vma, end, 0); |
| 564 | if (!err) |
| 565 | err = policy_vma(vma, new); |
| 566 | if (err) |
| 567 | break; |
| 568 | } |
| 569 | return err; |
| 570 | } |
| 571 | |
Paul Jackson | c61afb1 | 2006-03-24 03:16:08 -0800 | [diff] [blame] | 572 | /* |
| 573 | * Update task->flags PF_MEMPOLICY bit: set iff non-default |
| 574 | * mempolicy. Allows more rapid checking of this (combined perhaps |
| 575 | * with other PF_* flag bits) on memory allocation hot code paths. |
| 576 | * |
| 577 | * If called from outside this file, the task 'p' should -only- be |
| 578 | * a newly forked child not yet visible on the task list, because |
| 579 | * manipulating the task flags of a visible task is not safe. |
| 580 | * |
| 581 | * The above limitation is why this routine has the funny name |
| 582 | * mpol_fix_fork_child_flag(). |
| 583 | * |
| 584 | * It is also safe to call this with a task pointer of current, |
| 585 | * which the static wrapper mpol_set_task_struct_flag() does, |
| 586 | * for use within this file. |
| 587 | */ |
| 588 | |
| 589 | void mpol_fix_fork_child_flag(struct task_struct *p) |
| 590 | { |
| 591 | if (p->mempolicy) |
| 592 | p->flags |= PF_MEMPOLICY; |
| 593 | else |
| 594 | p->flags &= ~PF_MEMPOLICY; |
| 595 | } |
| 596 | |
| 597 | static void mpol_set_task_struct_flag(void) |
| 598 | { |
| 599 | mpol_fix_fork_child_flag(current); |
| 600 | } |
| 601 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | /* Set the process memory policy */ |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 603 | static long do_set_mempolicy(unsigned short mode, unsigned short flags, |
| 604 | nodemask_t *nodes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | struct mempolicy *new; |
Lee Schermerhorn | f4e53d9 | 2008-04-28 02:13:10 -0700 | [diff] [blame] | 607 | struct mm_struct *mm = current->mm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 609 | new = mpol_new(mode, flags, nodes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | if (IS_ERR(new)) |
| 611 | return PTR_ERR(new); |
Lee Schermerhorn | f4e53d9 | 2008-04-28 02:13:10 -0700 | [diff] [blame] | 612 | |
| 613 | /* |
| 614 | * prevent changing our mempolicy while show_numa_maps() |
| 615 | * is using it. |
| 616 | * Note: do_set_mempolicy() can be called at init time |
| 617 | * with no 'mm'. |
| 618 | */ |
| 619 | if (mm) |
| 620 | down_write(&mm->mmap_sem); |
Lee Schermerhorn | f0be3d3 | 2008-04-28 02:13:08 -0700 | [diff] [blame] | 621 | mpol_put(current->mempolicy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | current->mempolicy = new; |
Paul Jackson | c61afb1 | 2006-03-24 03:16:08 -0800 | [diff] [blame] | 623 | mpol_set_task_struct_flag(); |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 624 | if (new && new->mode == MPOL_INTERLEAVE && |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 625 | nodes_weight(new->v.nodes)) |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 626 | current->il_next = first_node(new->v.nodes); |
Lee Schermerhorn | f4e53d9 | 2008-04-28 02:13:10 -0700 | [diff] [blame] | 627 | if (mm) |
| 628 | up_write(&mm->mmap_sem); |
| 629 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | return 0; |
| 631 | } |
| 632 | |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 633 | /* |
| 634 | * Return nodemask for policy for get_mempolicy() query |
| 635 | */ |
| 636 | static void get_policy_nodemask(struct mempolicy *p, nodemask_t *nodes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | { |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 638 | nodes_clear(*nodes); |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 639 | if (p == &default_policy) |
| 640 | return; |
| 641 | |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 642 | switch (p->mode) { |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 643 | case MPOL_BIND: |
| 644 | /* Fall through */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | case MPOL_INTERLEAVE: |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 646 | *nodes = p->v.nodes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | break; |
| 648 | case MPOL_PREFERRED: |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 649 | if (!(p->flags & MPOL_F_LOCAL)) |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 650 | node_set(p->v.preferred_node, *nodes); |
Lee Schermerhorn | 53f2556 | 2008-04-28 02:13:20 -0700 | [diff] [blame] | 651 | /* else return empty node mask for local allocation */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | break; |
| 653 | default: |
| 654 | BUG(); |
| 655 | } |
| 656 | } |
| 657 | |
| 658 | static int lookup_node(struct mm_struct *mm, unsigned long addr) |
| 659 | { |
| 660 | struct page *p; |
| 661 | int err; |
| 662 | |
| 663 | err = get_user_pages(current, mm, addr & PAGE_MASK, 1, 0, 0, &p, NULL); |
| 664 | if (err >= 0) { |
| 665 | err = page_to_nid(p); |
| 666 | put_page(p); |
| 667 | } |
| 668 | return err; |
| 669 | } |
| 670 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | /* Retrieve NUMA policy */ |
Adrian Bunk | dbcb0f1 | 2007-10-16 01:26:26 -0700 | [diff] [blame] | 672 | static long do_get_mempolicy(int *policy, nodemask_t *nmask, |
| 673 | unsigned long addr, unsigned long flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | { |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 675 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | struct mm_struct *mm = current->mm; |
| 677 | struct vm_area_struct *vma = NULL; |
| 678 | struct mempolicy *pol = current->mempolicy; |
| 679 | |
Paul Jackson | cf2a473 | 2006-01-08 01:01:54 -0800 | [diff] [blame] | 680 | cpuset_update_task_memory_state(); |
Lee Schermerhorn | 754af6f | 2007-10-16 01:24:51 -0700 | [diff] [blame] | 681 | if (flags & |
| 682 | ~(unsigned long)(MPOL_F_NODE|MPOL_F_ADDR|MPOL_F_MEMS_ALLOWED)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | return -EINVAL; |
Lee Schermerhorn | 754af6f | 2007-10-16 01:24:51 -0700 | [diff] [blame] | 684 | |
| 685 | if (flags & MPOL_F_MEMS_ALLOWED) { |
| 686 | if (flags & (MPOL_F_NODE|MPOL_F_ADDR)) |
| 687 | return -EINVAL; |
| 688 | *policy = 0; /* just so it's initialized */ |
| 689 | *nmask = cpuset_current_mems_allowed; |
| 690 | return 0; |
| 691 | } |
| 692 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | if (flags & MPOL_F_ADDR) { |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 694 | /* |
| 695 | * Do NOT fall back to task policy if the |
| 696 | * vma/shared policy at addr is NULL. We |
| 697 | * want to return MPOL_DEFAULT in this case. |
| 698 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | down_read(&mm->mmap_sem); |
| 700 | vma = find_vma_intersection(mm, addr, addr+1); |
| 701 | if (!vma) { |
| 702 | up_read(&mm->mmap_sem); |
| 703 | return -EFAULT; |
| 704 | } |
| 705 | if (vma->vm_ops && vma->vm_ops->get_policy) |
| 706 | pol = vma->vm_ops->get_policy(vma, addr); |
| 707 | else |
| 708 | pol = vma->vm_policy; |
| 709 | } else if (addr) |
| 710 | return -EINVAL; |
| 711 | |
| 712 | if (!pol) |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 713 | pol = &default_policy; /* indicates default behavior */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | |
| 715 | if (flags & MPOL_F_NODE) { |
| 716 | if (flags & MPOL_F_ADDR) { |
| 717 | err = lookup_node(mm, addr); |
| 718 | if (err < 0) |
| 719 | goto out; |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 720 | *policy = err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | } else if (pol == current->mempolicy && |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 722 | pol->mode == MPOL_INTERLEAVE) { |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 723 | *policy = current->il_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | } else { |
| 725 | err = -EINVAL; |
| 726 | goto out; |
| 727 | } |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 728 | } else { |
| 729 | *policy = pol == &default_policy ? MPOL_DEFAULT : |
| 730 | pol->mode; |
| 731 | *policy |= pol->flags; |
| 732 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | |
| 734 | if (vma) { |
| 735 | up_read(¤t->mm->mmap_sem); |
| 736 | vma = NULL; |
| 737 | } |
| 738 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | err = 0; |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 740 | if (nmask) |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 741 | get_policy_nodemask(pol, nmask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | |
| 743 | out: |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 744 | mpol_cond_put(pol); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | if (vma) |
| 746 | up_read(¤t->mm->mmap_sem); |
| 747 | return err; |
| 748 | } |
| 749 | |
Christoph Lameter | b20a350 | 2006-03-22 00:09:12 -0800 | [diff] [blame] | 750 | #ifdef CONFIG_MIGRATION |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 751 | /* |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 752 | * page migration |
| 753 | */ |
Christoph Lameter | fc30128 | 2006-01-18 17:42:29 -0800 | [diff] [blame] | 754 | static void migrate_page_add(struct page *page, struct list_head *pagelist, |
| 755 | unsigned long flags) |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 756 | { |
| 757 | /* |
Christoph Lameter | fc30128 | 2006-01-18 17:42:29 -0800 | [diff] [blame] | 758 | * Avoid migrating a page that is shared with others. |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 759 | */ |
Christoph Lameter | b20a350 | 2006-03-22 00:09:12 -0800 | [diff] [blame] | 760 | if ((flags & MPOL_MF_MOVE_ALL) || page_mapcount(page) == 1) |
| 761 | isolate_lru_page(page, pagelist); |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 762 | } |
| 763 | |
Christoph Lameter | 742755a | 2006-06-23 02:03:55 -0700 | [diff] [blame] | 764 | 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] | 765 | { |
Mel Gorman | 769848c | 2007-07-17 04:03:05 -0700 | [diff] [blame] | 766 | return alloc_pages_node(node, GFP_HIGHUSER_MOVABLE, 0); |
Christoph Lameter | 95a402c | 2006-06-23 02:03:53 -0700 | [diff] [blame] | 767 | } |
| 768 | |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 769 | /* |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 770 | * Migrate pages from one node to a target node. |
| 771 | * Returns error or the number of pages not migrated. |
| 772 | */ |
Adrian Bunk | dbcb0f1 | 2007-10-16 01:26:26 -0700 | [diff] [blame] | 773 | static int migrate_to_node(struct mm_struct *mm, int source, int dest, |
| 774 | int flags) |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 775 | { |
| 776 | nodemask_t nmask; |
| 777 | LIST_HEAD(pagelist); |
| 778 | int err = 0; |
| 779 | |
| 780 | nodes_clear(nmask); |
| 781 | node_set(source, nmask); |
| 782 | |
| 783 | check_range(mm, mm->mmap->vm_start, TASK_SIZE, &nmask, |
| 784 | flags | MPOL_MF_DISCONTIG_OK, &pagelist); |
| 785 | |
Christoph Lameter | aaa994b | 2006-06-23 02:03:52 -0700 | [diff] [blame] | 786 | if (!list_empty(&pagelist)) |
Christoph Lameter | 95a402c | 2006-06-23 02:03:53 -0700 | [diff] [blame] | 787 | err = migrate_pages(&pagelist, new_node_page, dest); |
| 788 | |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 789 | return err; |
| 790 | } |
| 791 | |
| 792 | /* |
| 793 | * Move pages between the two nodesets so as to preserve the physical |
| 794 | * layout as much as possible. |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 795 | * |
| 796 | * Returns the number of page that could not be moved. |
| 797 | */ |
| 798 | int do_migrate_pages(struct mm_struct *mm, |
| 799 | const nodemask_t *from_nodes, const nodemask_t *to_nodes, int flags) |
| 800 | { |
| 801 | LIST_HEAD(pagelist); |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 802 | int busy = 0; |
| 803 | int err = 0; |
| 804 | nodemask_t tmp; |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 805 | |
Lee Schermerhorn | 53f2556 | 2008-04-28 02:13:20 -0700 | [diff] [blame] | 806 | down_read(&mm->mmap_sem); |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 807 | |
Christoph Lameter | 7b2259b | 2006-06-25 05:46:48 -0700 | [diff] [blame] | 808 | err = migrate_vmas(mm, from_nodes, to_nodes, flags); |
| 809 | if (err) |
| 810 | goto out; |
| 811 | |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 812 | /* |
| 813 | * Find a 'source' bit set in 'tmp' whose corresponding 'dest' |
| 814 | * bit in 'to' is not also set in 'tmp'. Clear the found 'source' |
| 815 | * bit in 'tmp', and return that <source, dest> pair for migration. |
| 816 | * The pair of nodemasks 'to' and 'from' define the map. |
| 817 | * |
| 818 | * If no pair of bits is found that way, fallback to picking some |
| 819 | * pair of 'source' and 'dest' bits that are not the same. If the |
| 820 | * 'source' and 'dest' bits are the same, this represents a node |
| 821 | * that will be migrating to itself, so no pages need move. |
| 822 | * |
| 823 | * If no bits are left in 'tmp', or if all remaining bits left |
| 824 | * in 'tmp' correspond to the same bit in 'to', return false |
| 825 | * (nothing left to migrate). |
| 826 | * |
| 827 | * This lets us pick a pair of nodes to migrate between, such that |
| 828 | * if possible the dest node is not already occupied by some other |
| 829 | * source node, minimizing the risk of overloading the memory on a |
| 830 | * node that would happen if we migrated incoming memory to a node |
| 831 | * before migrating outgoing memory source that same node. |
| 832 | * |
| 833 | * A single scan of tmp is sufficient. As we go, we remember the |
| 834 | * most recent <s, d> pair that moved (s != d). If we find a pair |
| 835 | * that not only moved, but what's better, moved to an empty slot |
| 836 | * (d is not set in tmp), then we break out then, with that pair. |
| 837 | * Otherwise when we finish scannng from_tmp, we at least have the |
| 838 | * most recent <s, d> pair that moved. If we get all the way through |
| 839 | * the scan of tmp without finding any node that moved, much less |
| 840 | * moved to an empty node, then there is nothing left worth migrating. |
| 841 | */ |
Christoph Lameter | d498471 | 2006-01-08 01:00:55 -0800 | [diff] [blame] | 842 | |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 843 | tmp = *from_nodes; |
| 844 | while (!nodes_empty(tmp)) { |
| 845 | int s,d; |
| 846 | int source = -1; |
| 847 | int dest = 0; |
| 848 | |
| 849 | for_each_node_mask(s, tmp) { |
| 850 | d = node_remap(s, *from_nodes, *to_nodes); |
| 851 | if (s == d) |
| 852 | continue; |
| 853 | |
| 854 | source = s; /* Node moved. Memorize */ |
| 855 | dest = d; |
| 856 | |
| 857 | /* dest not in remaining from nodes? */ |
| 858 | if (!node_isset(dest, tmp)) |
| 859 | break; |
| 860 | } |
| 861 | if (source == -1) |
| 862 | break; |
| 863 | |
| 864 | node_clear(source, tmp); |
| 865 | err = migrate_to_node(mm, source, dest, flags); |
| 866 | if (err > 0) |
| 867 | busy += err; |
| 868 | if (err < 0) |
| 869 | break; |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 870 | } |
Christoph Lameter | 7b2259b | 2006-06-25 05:46:48 -0700 | [diff] [blame] | 871 | out: |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 872 | up_read(&mm->mmap_sem); |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 873 | if (err < 0) |
| 874 | return err; |
| 875 | return busy; |
Christoph Lameter | b20a350 | 2006-03-22 00:09:12 -0800 | [diff] [blame] | 876 | |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 877 | } |
| 878 | |
Lee Schermerhorn | 3ad33b2 | 2007-11-14 16:59:10 -0800 | [diff] [blame] | 879 | /* |
| 880 | * Allocate a new page for page migration based on vma policy. |
| 881 | * Start assuming that page is mapped by vma pointed to by @private. |
| 882 | * Search forward from there, if not. N.B., this assumes that the |
| 883 | * list of pages handed to migrate_pages()--which is how we get here-- |
| 884 | * is in virtual address order. |
| 885 | */ |
Christoph Lameter | 742755a | 2006-06-23 02:03:55 -0700 | [diff] [blame] | 886 | 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] | 887 | { |
| 888 | struct vm_area_struct *vma = (struct vm_area_struct *)private; |
Lee Schermerhorn | 3ad33b2 | 2007-11-14 16:59:10 -0800 | [diff] [blame] | 889 | unsigned long uninitialized_var(address); |
Christoph Lameter | 95a402c | 2006-06-23 02:03:53 -0700 | [diff] [blame] | 890 | |
Lee Schermerhorn | 3ad33b2 | 2007-11-14 16:59:10 -0800 | [diff] [blame] | 891 | while (vma) { |
| 892 | address = page_address_in_vma(page, vma); |
| 893 | if (address != -EFAULT) |
| 894 | break; |
| 895 | vma = vma->vm_next; |
| 896 | } |
| 897 | |
| 898 | /* |
| 899 | * if !vma, alloc_page_vma() will use task or system default policy |
| 900 | */ |
| 901 | return alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma, address); |
Christoph Lameter | 95a402c | 2006-06-23 02:03:53 -0700 | [diff] [blame] | 902 | } |
Christoph Lameter | b20a350 | 2006-03-22 00:09:12 -0800 | [diff] [blame] | 903 | #else |
| 904 | |
| 905 | static void migrate_page_add(struct page *page, struct list_head *pagelist, |
| 906 | unsigned long flags) |
| 907 | { |
| 908 | } |
| 909 | |
| 910 | int do_migrate_pages(struct mm_struct *mm, |
| 911 | const nodemask_t *from_nodes, const nodemask_t *to_nodes, int flags) |
| 912 | { |
| 913 | return -ENOSYS; |
| 914 | } |
Christoph Lameter | 95a402c | 2006-06-23 02:03:53 -0700 | [diff] [blame] | 915 | |
Keith Owens | 6993974 | 2006-10-11 01:21:28 -0700 | [diff] [blame] | 916 | 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] | 917 | { |
| 918 | return NULL; |
| 919 | } |
Christoph Lameter | b20a350 | 2006-03-22 00:09:12 -0800 | [diff] [blame] | 920 | #endif |
| 921 | |
Adrian Bunk | dbcb0f1 | 2007-10-16 01:26:26 -0700 | [diff] [blame] | 922 | static long do_mbind(unsigned long start, unsigned long len, |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 923 | unsigned short mode, unsigned short mode_flags, |
| 924 | nodemask_t *nmask, unsigned long flags) |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 925 | { |
| 926 | struct vm_area_struct *vma; |
| 927 | struct mm_struct *mm = current->mm; |
| 928 | struct mempolicy *new; |
| 929 | unsigned long end; |
| 930 | int err; |
| 931 | LIST_HEAD(pagelist); |
| 932 | |
David Rientjes | a3b51e0 | 2008-04-28 02:12:23 -0700 | [diff] [blame] | 933 | if (flags & ~(unsigned long)(MPOL_MF_STRICT | |
| 934 | MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 935 | return -EINVAL; |
Christoph Lameter | 74c0024 | 2006-03-14 19:50:21 -0800 | [diff] [blame] | 936 | if ((flags & MPOL_MF_MOVE_ALL) && !capable(CAP_SYS_NICE)) |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 937 | return -EPERM; |
| 938 | |
| 939 | if (start & ~PAGE_MASK) |
| 940 | return -EINVAL; |
| 941 | |
| 942 | if (mode == MPOL_DEFAULT) |
| 943 | flags &= ~MPOL_MF_STRICT; |
| 944 | |
| 945 | len = (len + PAGE_SIZE - 1) & PAGE_MASK; |
| 946 | end = start + len; |
| 947 | |
| 948 | if (end < start) |
| 949 | return -EINVAL; |
| 950 | if (end == start) |
| 951 | return 0; |
| 952 | |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 953 | new = mpol_new(mode, mode_flags, nmask); |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 954 | if (IS_ERR(new)) |
| 955 | return PTR_ERR(new); |
| 956 | |
| 957 | /* |
| 958 | * If we are using the default policy then operation |
| 959 | * on discontinuous address spaces is okay after all |
| 960 | */ |
| 961 | if (!new) |
| 962 | flags |= MPOL_MF_DISCONTIG_OK; |
| 963 | |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 964 | pr_debug("mbind %lx-%lx mode:%d flags:%d nodes:%lx\n", |
| 965 | start, start + len, mode, mode_flags, |
| 966 | nmask ? nodes_addr(*nmask)[0] : -1); |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 967 | |
| 968 | down_write(&mm->mmap_sem); |
| 969 | vma = check_range(mm, start, end, nmask, |
| 970 | flags | MPOL_MF_INVERT, &pagelist); |
| 971 | |
| 972 | err = PTR_ERR(vma); |
| 973 | if (!IS_ERR(vma)) { |
| 974 | int nr_failed = 0; |
| 975 | |
| 976 | err = mbind_range(vma, start, end, new); |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 977 | |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 978 | if (!list_empty(&pagelist)) |
Christoph Lameter | 95a402c | 2006-06-23 02:03:53 -0700 | [diff] [blame] | 979 | nr_failed = migrate_pages(&pagelist, new_vma_page, |
| 980 | (unsigned long)vma); |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 981 | |
| 982 | if (!err && nr_failed && (flags & MPOL_MF_STRICT)) |
| 983 | err = -EIO; |
| 984 | } |
Christoph Lameter | b20a350 | 2006-03-22 00:09:12 -0800 | [diff] [blame] | 985 | |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 986 | up_write(&mm->mmap_sem); |
Lee Schermerhorn | f0be3d3 | 2008-04-28 02:13:08 -0700 | [diff] [blame] | 987 | mpol_put(new); |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 988 | return err; |
| 989 | } |
| 990 | |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 991 | /* |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 992 | * User space interface with variable sized bitmaps for nodelists. |
| 993 | */ |
| 994 | |
| 995 | /* Copy a node mask from user space. */ |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 996 | static int get_nodes(nodemask_t *nodes, const unsigned long __user *nmask, |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 997 | unsigned long maxnode) |
| 998 | { |
| 999 | unsigned long k; |
| 1000 | unsigned long nlongs; |
| 1001 | unsigned long endmask; |
| 1002 | |
| 1003 | --maxnode; |
| 1004 | nodes_clear(*nodes); |
| 1005 | if (maxnode == 0 || !nmask) |
| 1006 | return 0; |
Andi Kleen | a9c930b | 2006-02-20 18:27:59 -0800 | [diff] [blame] | 1007 | if (maxnode > PAGE_SIZE*BITS_PER_BYTE) |
Chris Wright | 636f13c | 2006-02-17 13:59:36 -0800 | [diff] [blame] | 1008 | return -EINVAL; |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1009 | |
| 1010 | nlongs = BITS_TO_LONGS(maxnode); |
| 1011 | if ((maxnode % BITS_PER_LONG) == 0) |
| 1012 | endmask = ~0UL; |
| 1013 | else |
| 1014 | endmask = (1UL << (maxnode % BITS_PER_LONG)) - 1; |
| 1015 | |
| 1016 | /* When the user specified more nodes than supported just check |
| 1017 | if the non supported part is all zero. */ |
| 1018 | if (nlongs > BITS_TO_LONGS(MAX_NUMNODES)) { |
| 1019 | if (nlongs > PAGE_SIZE/sizeof(long)) |
| 1020 | return -EINVAL; |
| 1021 | for (k = BITS_TO_LONGS(MAX_NUMNODES); k < nlongs; k++) { |
| 1022 | unsigned long t; |
| 1023 | if (get_user(t, nmask + k)) |
| 1024 | return -EFAULT; |
| 1025 | if (k == nlongs - 1) { |
| 1026 | if (t & endmask) |
| 1027 | return -EINVAL; |
| 1028 | } else if (t) |
| 1029 | return -EINVAL; |
| 1030 | } |
| 1031 | nlongs = BITS_TO_LONGS(MAX_NUMNODES); |
| 1032 | endmask = ~0UL; |
| 1033 | } |
| 1034 | |
| 1035 | if (copy_from_user(nodes_addr(*nodes), nmask, nlongs*sizeof(unsigned long))) |
| 1036 | return -EFAULT; |
| 1037 | nodes_addr(*nodes)[nlongs-1] &= endmask; |
| 1038 | return 0; |
| 1039 | } |
| 1040 | |
| 1041 | /* Copy a kernel node mask to user space */ |
| 1042 | static int copy_nodes_to_user(unsigned long __user *mask, unsigned long maxnode, |
| 1043 | nodemask_t *nodes) |
| 1044 | { |
| 1045 | unsigned long copy = ALIGN(maxnode-1, 64) / 8; |
| 1046 | const int nbytes = BITS_TO_LONGS(MAX_NUMNODES) * sizeof(long); |
| 1047 | |
| 1048 | if (copy > nbytes) { |
| 1049 | if (copy > PAGE_SIZE) |
| 1050 | return -EINVAL; |
| 1051 | if (clear_user((char __user *)mask + nbytes, copy - nbytes)) |
| 1052 | return -EFAULT; |
| 1053 | copy = nbytes; |
| 1054 | } |
| 1055 | return copy_to_user(mask, nodes_addr(*nodes), copy) ? -EFAULT : 0; |
| 1056 | } |
| 1057 | |
| 1058 | asmlinkage long sys_mbind(unsigned long start, unsigned long len, |
| 1059 | unsigned long mode, |
| 1060 | unsigned long __user *nmask, unsigned long maxnode, |
| 1061 | unsigned flags) |
| 1062 | { |
| 1063 | nodemask_t nodes; |
| 1064 | int err; |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 1065 | unsigned short mode_flags; |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1066 | |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 1067 | mode_flags = mode & MPOL_MODE_FLAGS; |
| 1068 | mode &= ~MPOL_MODE_FLAGS; |
David Rientjes | a3b51e0 | 2008-04-28 02:12:23 -0700 | [diff] [blame] | 1069 | if (mode >= MPOL_MAX) |
| 1070 | return -EINVAL; |
David Rientjes | 4c50bc0 | 2008-04-28 02:12:30 -0700 | [diff] [blame] | 1071 | if ((mode_flags & MPOL_F_STATIC_NODES) && |
| 1072 | (mode_flags & MPOL_F_RELATIVE_NODES)) |
| 1073 | return -EINVAL; |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1074 | err = get_nodes(&nodes, nmask, maxnode); |
| 1075 | if (err) |
| 1076 | return err; |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 1077 | return do_mbind(start, len, mode, mode_flags, &nodes, flags); |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1078 | } |
| 1079 | |
| 1080 | /* Set the process memory policy */ |
| 1081 | asmlinkage long sys_set_mempolicy(int mode, unsigned long __user *nmask, |
| 1082 | unsigned long maxnode) |
| 1083 | { |
| 1084 | int err; |
| 1085 | nodemask_t nodes; |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 1086 | unsigned short flags; |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1087 | |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 1088 | flags = mode & MPOL_MODE_FLAGS; |
| 1089 | mode &= ~MPOL_MODE_FLAGS; |
| 1090 | if ((unsigned int)mode >= MPOL_MAX) |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1091 | return -EINVAL; |
David Rientjes | 4c50bc0 | 2008-04-28 02:12:30 -0700 | [diff] [blame] | 1092 | if ((flags & MPOL_F_STATIC_NODES) && (flags & MPOL_F_RELATIVE_NODES)) |
| 1093 | return -EINVAL; |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1094 | err = get_nodes(&nodes, nmask, maxnode); |
| 1095 | if (err) |
| 1096 | return err; |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 1097 | return do_set_mempolicy(mode, flags, &nodes); |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1098 | } |
| 1099 | |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1100 | asmlinkage long sys_migrate_pages(pid_t pid, unsigned long maxnode, |
| 1101 | const unsigned long __user *old_nodes, |
| 1102 | const unsigned long __user *new_nodes) |
| 1103 | { |
| 1104 | struct mm_struct *mm; |
| 1105 | struct task_struct *task; |
| 1106 | nodemask_t old; |
| 1107 | nodemask_t new; |
| 1108 | nodemask_t task_nodes; |
| 1109 | int err; |
| 1110 | |
| 1111 | err = get_nodes(&old, old_nodes, maxnode); |
| 1112 | if (err) |
| 1113 | return err; |
| 1114 | |
| 1115 | err = get_nodes(&new, new_nodes, maxnode); |
| 1116 | if (err) |
| 1117 | return err; |
| 1118 | |
| 1119 | /* Find the mm_struct */ |
| 1120 | read_lock(&tasklist_lock); |
Pavel Emelyanov | 228ebcb | 2007-10-18 23:40:16 -0700 | [diff] [blame] | 1121 | task = pid ? find_task_by_vpid(pid) : current; |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1122 | if (!task) { |
| 1123 | read_unlock(&tasklist_lock); |
| 1124 | return -ESRCH; |
| 1125 | } |
| 1126 | mm = get_task_mm(task); |
| 1127 | read_unlock(&tasklist_lock); |
| 1128 | |
| 1129 | if (!mm) |
| 1130 | return -EINVAL; |
| 1131 | |
| 1132 | /* |
| 1133 | * Check if this process has the right to modify the specified |
| 1134 | * process. The right exists if the process has administrative |
Alexey Dobriyan | 7f927fc | 2006-03-28 01:56:53 -0800 | [diff] [blame] | 1135 | * capabilities, superuser privileges or the same |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1136 | * userid as the target process. |
| 1137 | */ |
| 1138 | if ((current->euid != task->suid) && (current->euid != task->uid) && |
| 1139 | (current->uid != task->suid) && (current->uid != task->uid) && |
Christoph Lameter | 74c0024 | 2006-03-14 19:50:21 -0800 | [diff] [blame] | 1140 | !capable(CAP_SYS_NICE)) { |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1141 | err = -EPERM; |
| 1142 | goto out; |
| 1143 | } |
| 1144 | |
| 1145 | task_nodes = cpuset_mems_allowed(task); |
| 1146 | /* Is the user allowed to access the target nodes? */ |
Christoph Lameter | 74c0024 | 2006-03-14 19:50:21 -0800 | [diff] [blame] | 1147 | if (!nodes_subset(new, task_nodes) && !capable(CAP_SYS_NICE)) { |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1148 | err = -EPERM; |
| 1149 | goto out; |
| 1150 | } |
| 1151 | |
Lee Schermerhorn | 37b07e4 | 2007-10-16 01:25:39 -0700 | [diff] [blame] | 1152 | if (!nodes_subset(new, node_states[N_HIGH_MEMORY])) { |
Christoph Lameter | 3b42d28 | 2007-08-31 00:12:08 -0700 | [diff] [blame] | 1153 | err = -EINVAL; |
| 1154 | goto out; |
| 1155 | } |
| 1156 | |
David Quigley | 86c3a76 | 2006-06-23 02:04:02 -0700 | [diff] [blame] | 1157 | err = security_task_movememory(task); |
| 1158 | if (err) |
| 1159 | goto out; |
| 1160 | |
Christoph Lameter | 511030b | 2006-02-28 16:58:57 -0800 | [diff] [blame] | 1161 | err = do_migrate_pages(mm, &old, &new, |
Christoph Lameter | 74c0024 | 2006-03-14 19:50:21 -0800 | [diff] [blame] | 1162 | capable(CAP_SYS_NICE) ? MPOL_MF_MOVE_ALL : MPOL_MF_MOVE); |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 1163 | out: |
| 1164 | mmput(mm); |
| 1165 | return err; |
| 1166 | } |
| 1167 | |
| 1168 | |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1169 | /* Retrieve NUMA policy */ |
| 1170 | asmlinkage long sys_get_mempolicy(int __user *policy, |
| 1171 | unsigned long __user *nmask, |
| 1172 | unsigned long maxnode, |
| 1173 | unsigned long addr, unsigned long flags) |
| 1174 | { |
Adrian Bunk | dbcb0f1 | 2007-10-16 01:26:26 -0700 | [diff] [blame] | 1175 | int err; |
| 1176 | int uninitialized_var(pval); |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1177 | nodemask_t nodes; |
| 1178 | |
| 1179 | if (nmask != NULL && maxnode < MAX_NUMNODES) |
| 1180 | return -EINVAL; |
| 1181 | |
| 1182 | err = do_get_mempolicy(&pval, &nodes, addr, flags); |
| 1183 | |
| 1184 | if (err) |
| 1185 | return err; |
| 1186 | |
| 1187 | if (policy && put_user(pval, policy)) |
| 1188 | return -EFAULT; |
| 1189 | |
| 1190 | if (nmask) |
| 1191 | err = copy_nodes_to_user(nmask, maxnode, &nodes); |
| 1192 | |
| 1193 | return err; |
| 1194 | } |
| 1195 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1196 | #ifdef CONFIG_COMPAT |
| 1197 | |
| 1198 | asmlinkage long compat_sys_get_mempolicy(int __user *policy, |
| 1199 | compat_ulong_t __user *nmask, |
| 1200 | compat_ulong_t maxnode, |
| 1201 | compat_ulong_t addr, compat_ulong_t flags) |
| 1202 | { |
| 1203 | long err; |
| 1204 | unsigned long __user *nm = NULL; |
| 1205 | unsigned long nr_bits, alloc_size; |
| 1206 | DECLARE_BITMAP(bm, MAX_NUMNODES); |
| 1207 | |
| 1208 | nr_bits = min_t(unsigned long, maxnode-1, MAX_NUMNODES); |
| 1209 | alloc_size = ALIGN(nr_bits, BITS_PER_LONG) / 8; |
| 1210 | |
| 1211 | if (nmask) |
| 1212 | nm = compat_alloc_user_space(alloc_size); |
| 1213 | |
| 1214 | err = sys_get_mempolicy(policy, nm, nr_bits+1, addr, flags); |
| 1215 | |
| 1216 | if (!err && nmask) { |
| 1217 | err = copy_from_user(bm, nm, alloc_size); |
| 1218 | /* ensure entire bitmap is zeroed */ |
| 1219 | err |= clear_user(nmask, ALIGN(maxnode-1, 8) / 8); |
| 1220 | err |= compat_put_bitmap(nmask, bm, nr_bits); |
| 1221 | } |
| 1222 | |
| 1223 | return err; |
| 1224 | } |
| 1225 | |
| 1226 | asmlinkage long compat_sys_set_mempolicy(int mode, compat_ulong_t __user *nmask, |
| 1227 | compat_ulong_t maxnode) |
| 1228 | { |
| 1229 | long err = 0; |
| 1230 | unsigned long __user *nm = NULL; |
| 1231 | unsigned long nr_bits, alloc_size; |
| 1232 | DECLARE_BITMAP(bm, MAX_NUMNODES); |
| 1233 | |
| 1234 | nr_bits = min_t(unsigned long, maxnode-1, MAX_NUMNODES); |
| 1235 | alloc_size = ALIGN(nr_bits, BITS_PER_LONG) / 8; |
| 1236 | |
| 1237 | if (nmask) { |
| 1238 | err = compat_get_bitmap(bm, nmask, nr_bits); |
| 1239 | nm = compat_alloc_user_space(alloc_size); |
| 1240 | err |= copy_to_user(nm, bm, alloc_size); |
| 1241 | } |
| 1242 | |
| 1243 | if (err) |
| 1244 | return -EFAULT; |
| 1245 | |
| 1246 | return sys_set_mempolicy(mode, nm, nr_bits+1); |
| 1247 | } |
| 1248 | |
| 1249 | asmlinkage long compat_sys_mbind(compat_ulong_t start, compat_ulong_t len, |
| 1250 | compat_ulong_t mode, compat_ulong_t __user *nmask, |
| 1251 | compat_ulong_t maxnode, compat_ulong_t flags) |
| 1252 | { |
| 1253 | long err = 0; |
| 1254 | unsigned long __user *nm = NULL; |
| 1255 | unsigned long nr_bits, alloc_size; |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 1256 | nodemask_t bm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1257 | |
| 1258 | nr_bits = min_t(unsigned long, maxnode-1, MAX_NUMNODES); |
| 1259 | alloc_size = ALIGN(nr_bits, BITS_PER_LONG) / 8; |
| 1260 | |
| 1261 | if (nmask) { |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 1262 | err = compat_get_bitmap(nodes_addr(bm), nmask, nr_bits); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1263 | nm = compat_alloc_user_space(alloc_size); |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 1264 | err |= copy_to_user(nm, nodes_addr(bm), alloc_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1265 | } |
| 1266 | |
| 1267 | if (err) |
| 1268 | return -EFAULT; |
| 1269 | |
| 1270 | return sys_mbind(start, len, mode, nm, nr_bits+1, flags); |
| 1271 | } |
| 1272 | |
| 1273 | #endif |
| 1274 | |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1275 | /* |
| 1276 | * get_vma_policy(@task, @vma, @addr) |
| 1277 | * @task - task for fallback if vma policy == default |
| 1278 | * @vma - virtual memory area whose policy is sought |
| 1279 | * @addr - address in @vma for shared policy lookup |
| 1280 | * |
| 1281 | * Returns effective policy for a VMA at specified address. |
| 1282 | * Falls back to @task or system default policy, as necessary. |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1283 | * Current or other task's task mempolicy and non-shared vma policies |
| 1284 | * are protected by the task's mmap_sem, which must be held for read by |
| 1285 | * the caller. |
| 1286 | * Shared policies [those marked as MPOL_F_SHARED] require an extra reference |
| 1287 | * count--added by the get_policy() vm_op, as appropriate--to protect against |
| 1288 | * freeing by another task. It is the caller's responsibility to free the |
| 1289 | * extra reference for shared policies. |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1290 | */ |
Lee Schermerhorn | ae4d8c1 | 2008-04-28 02:13:11 -0700 | [diff] [blame] | 1291 | static struct mempolicy *get_vma_policy(struct task_struct *task, |
Christoph Lameter | 48fce34 | 2006-01-08 01:01:03 -0800 | [diff] [blame] | 1292 | struct vm_area_struct *vma, unsigned long addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1293 | { |
Christoph Lameter | 6e21c8f | 2005-09-03 15:54:45 -0700 | [diff] [blame] | 1294 | struct mempolicy *pol = task->mempolicy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1295 | |
| 1296 | if (vma) { |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1297 | if (vma->vm_ops && vma->vm_ops->get_policy) { |
Lee Schermerhorn | ae4d8c1 | 2008-04-28 02:13:11 -0700 | [diff] [blame] | 1298 | struct mempolicy *vpol = vma->vm_ops->get_policy(vma, |
| 1299 | addr); |
| 1300 | if (vpol) |
| 1301 | pol = vpol; |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 1302 | } else if (vma->vm_policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1303 | pol = vma->vm_policy; |
| 1304 | } |
| 1305 | if (!pol) |
| 1306 | pol = &default_policy; |
| 1307 | return pol; |
| 1308 | } |
| 1309 | |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1310 | /* |
| 1311 | * Return a nodemask representing a mempolicy for filtering nodes for |
| 1312 | * page allocation |
| 1313 | */ |
| 1314 | static nodemask_t *policy_nodemask(gfp_t gfp, struct mempolicy *policy) |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1315 | { |
| 1316 | /* Lower zones don't get a nodemask applied for MPOL_BIND */ |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 1317 | if (unlikely(policy->mode == MPOL_BIND) && |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1318 | gfp_zone(gfp) >= policy_zone && |
| 1319 | cpuset_nodemask_valid_mems_allowed(&policy->v.nodes)) |
| 1320 | return &policy->v.nodes; |
| 1321 | |
| 1322 | return NULL; |
| 1323 | } |
| 1324 | |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1325 | /* Return a zonelist indicated by gfp for node representing a mempolicy */ |
| 1326 | static struct zonelist *policy_zonelist(gfp_t gfp, struct mempolicy *policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1327 | { |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 1328 | int nd = numa_node_id(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1329 | |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 1330 | switch (policy->mode) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1331 | case MPOL_PREFERRED: |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 1332 | if (!(policy->flags & MPOL_F_LOCAL)) |
| 1333 | nd = policy->v.preferred_node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1334 | break; |
| 1335 | case MPOL_BIND: |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1336 | /* |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1337 | * Normally, MPOL_BIND allocations are node-local within the |
| 1338 | * allowed nodemask. However, if __GFP_THISNODE is set and the |
| 1339 | * current node is part of the mask, we use the zonelist for |
| 1340 | * the first node in the mask instead. |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1341 | */ |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1342 | if (unlikely(gfp & __GFP_THISNODE) && |
| 1343 | unlikely(!node_isset(nd, policy->v.nodes))) |
| 1344 | nd = first_node(policy->v.nodes); |
| 1345 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1346 | case MPOL_INTERLEAVE: /* should not happen */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1347 | break; |
| 1348 | default: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1349 | BUG(); |
| 1350 | } |
Mel Gorman | 0e88460 | 2008-04-28 02:12:14 -0700 | [diff] [blame] | 1351 | return node_zonelist(nd, gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1352 | } |
| 1353 | |
| 1354 | /* Do dynamic interleaving for a process */ |
| 1355 | static unsigned interleave_nodes(struct mempolicy *policy) |
| 1356 | { |
| 1357 | unsigned nid, next; |
| 1358 | struct task_struct *me = current; |
| 1359 | |
| 1360 | nid = me->il_next; |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 1361 | next = next_node(nid, policy->v.nodes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1362 | if (next >= MAX_NUMNODES) |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 1363 | next = first_node(policy->v.nodes); |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 1364 | if (next < MAX_NUMNODES) |
| 1365 | me->il_next = next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | return nid; |
| 1367 | } |
| 1368 | |
Christoph Lameter | dc85da1 | 2006-01-18 17:42:36 -0800 | [diff] [blame] | 1369 | /* |
| 1370 | * Depending on the memory policy provide a node from which to allocate the |
| 1371 | * next slab entry. |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1372 | * @policy must be protected by freeing by the caller. If @policy is |
| 1373 | * the current task's mempolicy, this protection is implicit, as only the |
| 1374 | * task can change it's policy. The system default policy requires no |
| 1375 | * such protection. |
Christoph Lameter | dc85da1 | 2006-01-18 17:42:36 -0800 | [diff] [blame] | 1376 | */ |
| 1377 | unsigned slab_node(struct mempolicy *policy) |
| 1378 | { |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 1379 | if (!policy || policy->flags & MPOL_F_LOCAL) |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 1380 | return numa_node_id(); |
Christoph Lameter | 765c450 | 2006-09-27 01:50:08 -0700 | [diff] [blame] | 1381 | |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 1382 | switch (policy->mode) { |
| 1383 | case MPOL_PREFERRED: |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 1384 | /* |
| 1385 | * handled MPOL_F_LOCAL above |
| 1386 | */ |
| 1387 | return policy->v.preferred_node; |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 1388 | |
Christoph Lameter | dc85da1 | 2006-01-18 17:42:36 -0800 | [diff] [blame] | 1389 | case MPOL_INTERLEAVE: |
| 1390 | return interleave_nodes(policy); |
| 1391 | |
Mel Gorman | dd1a239 | 2008-04-28 02:12:17 -0700 | [diff] [blame] | 1392 | case MPOL_BIND: { |
Christoph Lameter | dc85da1 | 2006-01-18 17:42:36 -0800 | [diff] [blame] | 1393 | /* |
| 1394 | * Follow bind policy behavior and start allocation at the |
| 1395 | * first node. |
| 1396 | */ |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1397 | struct zonelist *zonelist; |
| 1398 | struct zone *zone; |
| 1399 | enum zone_type highest_zoneidx = gfp_zone(GFP_KERNEL); |
| 1400 | zonelist = &NODE_DATA(numa_node_id())->node_zonelists[0]; |
| 1401 | (void)first_zones_zonelist(zonelist, highest_zoneidx, |
| 1402 | &policy->v.nodes, |
| 1403 | &zone); |
| 1404 | return zone->node; |
Mel Gorman | dd1a239 | 2008-04-28 02:12:17 -0700 | [diff] [blame] | 1405 | } |
Christoph Lameter | dc85da1 | 2006-01-18 17:42:36 -0800 | [diff] [blame] | 1406 | |
Christoph Lameter | dc85da1 | 2006-01-18 17:42:36 -0800 | [diff] [blame] | 1407 | default: |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 1408 | BUG(); |
Christoph Lameter | dc85da1 | 2006-01-18 17:42:36 -0800 | [diff] [blame] | 1409 | } |
| 1410 | } |
| 1411 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1412 | /* Do static interleaving for a VMA with known offset. */ |
| 1413 | static unsigned offset_il_node(struct mempolicy *pol, |
| 1414 | struct vm_area_struct *vma, unsigned long off) |
| 1415 | { |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 1416 | unsigned nnodes = nodes_weight(pol->v.nodes); |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 1417 | unsigned target; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1418 | int c; |
| 1419 | int nid = -1; |
| 1420 | |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 1421 | if (!nnodes) |
| 1422 | return numa_node_id(); |
| 1423 | target = (unsigned int)off % nnodes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1424 | c = 0; |
| 1425 | do { |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 1426 | nid = next_node(nid, pol->v.nodes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1427 | c++; |
| 1428 | } while (c <= target); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1429 | return nid; |
| 1430 | } |
| 1431 | |
Christoph Lameter | 5da7ca8 | 2006-01-06 00:10:46 -0800 | [diff] [blame] | 1432 | /* Determine a node number for interleave */ |
| 1433 | static inline unsigned interleave_nid(struct mempolicy *pol, |
| 1434 | struct vm_area_struct *vma, unsigned long addr, int shift) |
| 1435 | { |
| 1436 | if (vma) { |
| 1437 | unsigned long off; |
| 1438 | |
Nishanth Aravamudan | 3b98b08 | 2006-08-31 21:27:53 -0700 | [diff] [blame] | 1439 | /* |
| 1440 | * for small pages, there is no difference between |
| 1441 | * shift and PAGE_SHIFT, so the bit-shift is safe. |
| 1442 | * for huge pages, since vm_pgoff is in units of small |
| 1443 | * pages, we need to shift off the always 0 bits to get |
| 1444 | * a useful offset. |
| 1445 | */ |
| 1446 | BUG_ON(shift < PAGE_SHIFT); |
| 1447 | off = vma->vm_pgoff >> (shift - PAGE_SHIFT); |
Christoph Lameter | 5da7ca8 | 2006-01-06 00:10:46 -0800 | [diff] [blame] | 1448 | off += (addr - vma->vm_start) >> shift; |
| 1449 | return offset_il_node(pol, vma, off); |
| 1450 | } else |
| 1451 | return interleave_nodes(pol); |
| 1452 | } |
| 1453 | |
Chen, Kenneth W | 00ac59a | 2006-02-03 21:51:14 +0100 | [diff] [blame] | 1454 | #ifdef CONFIG_HUGETLBFS |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1455 | /* |
| 1456 | * huge_zonelist(@vma, @addr, @gfp_flags, @mpol) |
| 1457 | * @vma = virtual memory area whose policy is sought |
| 1458 | * @addr = address in @vma for shared policy lookup and interleave policy |
| 1459 | * @gfp_flags = for requested zone |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1460 | * @mpol = pointer to mempolicy pointer for reference counted mempolicy |
| 1461 | * @nodemask = pointer to nodemask pointer for MPOL_BIND nodemask |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1462 | * |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1463 | * Returns a zonelist suitable for a huge page allocation and a pointer |
| 1464 | * to the struct mempolicy for conditional unref after allocation. |
| 1465 | * If the effective policy is 'BIND, returns a pointer to the mempolicy's |
| 1466 | * @nodemask for filtering the zonelist. |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1467 | */ |
Mel Gorman | 396faf0 | 2007-07-17 04:03:13 -0700 | [diff] [blame] | 1468 | struct zonelist *huge_zonelist(struct vm_area_struct *vma, unsigned long addr, |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1469 | gfp_t gfp_flags, struct mempolicy **mpol, |
| 1470 | nodemask_t **nodemask) |
Christoph Lameter | 5da7ca8 | 2006-01-06 00:10:46 -0800 | [diff] [blame] | 1471 | { |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1472 | struct zonelist *zl; |
Christoph Lameter | 5da7ca8 | 2006-01-06 00:10:46 -0800 | [diff] [blame] | 1473 | |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1474 | *mpol = get_vma_policy(current, vma, addr); |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1475 | *nodemask = NULL; /* assume !MPOL_BIND */ |
Christoph Lameter | 5da7ca8 | 2006-01-06 00:10:46 -0800 | [diff] [blame] | 1476 | |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1477 | if (unlikely((*mpol)->mode == MPOL_INTERLEAVE)) { |
| 1478 | zl = node_zonelist(interleave_nid(*mpol, vma, addr, |
| 1479 | HPAGE_SHIFT), gfp_flags); |
| 1480 | } else { |
| 1481 | zl = policy_zonelist(gfp_flags, *mpol); |
| 1482 | if ((*mpol)->mode == MPOL_BIND) |
| 1483 | *nodemask = &(*mpol)->v.nodes; |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1484 | } |
| 1485 | return zl; |
Christoph Lameter | 5da7ca8 | 2006-01-06 00:10:46 -0800 | [diff] [blame] | 1486 | } |
Chen, Kenneth W | 00ac59a | 2006-02-03 21:51:14 +0100 | [diff] [blame] | 1487 | #endif |
Christoph Lameter | 5da7ca8 | 2006-01-06 00:10:46 -0800 | [diff] [blame] | 1488 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1489 | /* Allocate a page in interleaved policy. |
| 1490 | Own path because it needs to do special accounting. */ |
Andi Kleen | 662f3a0 | 2005-10-29 18:15:49 -0700 | [diff] [blame] | 1491 | static struct page *alloc_page_interleave(gfp_t gfp, unsigned order, |
| 1492 | unsigned nid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1493 | { |
| 1494 | struct zonelist *zl; |
| 1495 | struct page *page; |
| 1496 | |
Mel Gorman | 0e88460 | 2008-04-28 02:12:14 -0700 | [diff] [blame] | 1497 | zl = node_zonelist(nid, gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1498 | page = __alloc_pages(gfp, order, zl); |
Mel Gorman | dd1a239 | 2008-04-28 02:12:17 -0700 | [diff] [blame] | 1499 | if (page && page_zone(page) == zonelist_zone(&zl->_zonerefs[0])) |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 1500 | inc_zone_page_state(page, NUMA_INTERLEAVE_HIT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1501 | return page; |
| 1502 | } |
| 1503 | |
| 1504 | /** |
| 1505 | * alloc_page_vma - Allocate a page for a VMA. |
| 1506 | * |
| 1507 | * @gfp: |
| 1508 | * %GFP_USER user allocation. |
| 1509 | * %GFP_KERNEL kernel allocations, |
| 1510 | * %GFP_HIGHMEM highmem/user allocations, |
| 1511 | * %GFP_FS allocation should not call back into a file system. |
| 1512 | * %GFP_ATOMIC don't sleep. |
| 1513 | * |
| 1514 | * @vma: Pointer to VMA or NULL if not available. |
| 1515 | * @addr: Virtual Address of the allocation. Must be inside the VMA. |
| 1516 | * |
| 1517 | * This function allocates a page from the kernel page pool and applies |
| 1518 | * a NUMA policy associated with the VMA or the current process. |
| 1519 | * When VMA is not NULL caller must hold down_read on the mmap_sem of the |
| 1520 | * mm_struct of the VMA to prevent it from going away. Should be used for |
| 1521 | * all allocations for pages that will be mapped into |
| 1522 | * user space. Returns NULL when no page can be allocated. |
| 1523 | * |
| 1524 | * Should be called with the mm_sem of the vma hold. |
| 1525 | */ |
| 1526 | struct page * |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1527 | alloc_page_vma(gfp_t gfp, struct vm_area_struct *vma, unsigned long addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1528 | { |
Christoph Lameter | 6e21c8f | 2005-09-03 15:54:45 -0700 | [diff] [blame] | 1529 | struct mempolicy *pol = get_vma_policy(current, vma, addr); |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1530 | struct zonelist *zl; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1531 | |
Paul Jackson | cf2a473 | 2006-01-08 01:01:54 -0800 | [diff] [blame] | 1532 | cpuset_update_task_memory_state(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1533 | |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 1534 | if (unlikely(pol->mode == MPOL_INTERLEAVE)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1535 | unsigned nid; |
Christoph Lameter | 5da7ca8 | 2006-01-06 00:10:46 -0800 | [diff] [blame] | 1536 | |
| 1537 | nid = interleave_nid(pol, vma, addr, PAGE_SHIFT); |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1538 | mpol_cond_put(pol); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1539 | return alloc_page_interleave(gfp, 0, nid); |
| 1540 | } |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1541 | zl = policy_zonelist(gfp, pol); |
| 1542 | if (unlikely(mpol_needs_cond_ref(pol))) { |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1543 | /* |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1544 | * slow path: ref counted shared policy |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1545 | */ |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1546 | struct page *page = __alloc_pages_nodemask(gfp, 0, |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1547 | zl, policy_nodemask(gfp, pol)); |
Lee Schermerhorn | f0be3d3 | 2008-04-28 02:13:08 -0700 | [diff] [blame] | 1548 | __mpol_put(pol); |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1549 | return page; |
| 1550 | } |
| 1551 | /* |
| 1552 | * fast path: default or task policy |
| 1553 | */ |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1554 | return __alloc_pages_nodemask(gfp, 0, zl, policy_nodemask(gfp, pol)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1555 | } |
| 1556 | |
| 1557 | /** |
| 1558 | * alloc_pages_current - Allocate pages. |
| 1559 | * |
| 1560 | * @gfp: |
| 1561 | * %GFP_USER user allocation, |
| 1562 | * %GFP_KERNEL kernel allocation, |
| 1563 | * %GFP_HIGHMEM highmem allocation, |
| 1564 | * %GFP_FS don't call back into a file system. |
| 1565 | * %GFP_ATOMIC don't sleep. |
| 1566 | * @order: Power of two of allocation size in pages. 0 is a single page. |
| 1567 | * |
| 1568 | * Allocate a page from the kernel page pool. When not in |
| 1569 | * interrupt context and apply the current process NUMA policy. |
| 1570 | * Returns NULL when no page can be allocated. |
| 1571 | * |
Paul Jackson | cf2a473 | 2006-01-08 01:01:54 -0800 | [diff] [blame] | 1572 | * Don't call cpuset_update_task_memory_state() unless |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1573 | * 1) it's ok to take cpuset_sem (can WAIT), and |
| 1574 | * 2) allocating for current task (not interrupt). |
| 1575 | */ |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1576 | struct page *alloc_pages_current(gfp_t gfp, unsigned order) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1577 | { |
| 1578 | struct mempolicy *pol = current->mempolicy; |
| 1579 | |
| 1580 | if ((gfp & __GFP_WAIT) && !in_interrupt()) |
Paul Jackson | cf2a473 | 2006-01-08 01:01:54 -0800 | [diff] [blame] | 1581 | cpuset_update_task_memory_state(); |
Christoph Lameter | 9b819d2 | 2006-09-25 23:31:40 -0700 | [diff] [blame] | 1582 | if (!pol || in_interrupt() || (gfp & __GFP_THISNODE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1583 | pol = &default_policy; |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1584 | |
| 1585 | /* |
| 1586 | * No reference counting needed for current->mempolicy |
| 1587 | * nor system default_policy |
| 1588 | */ |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 1589 | if (pol->mode == MPOL_INTERLEAVE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1590 | return alloc_page_interleave(gfp, order, interleave_nodes(pol)); |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1591 | return __alloc_pages_nodemask(gfp, order, |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1592 | policy_zonelist(gfp, pol), policy_nodemask(gfp, pol)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1593 | } |
| 1594 | EXPORT_SYMBOL(alloc_pages_current); |
| 1595 | |
Paul Jackson | 4225399 | 2006-01-08 01:01:59 -0800 | [diff] [blame] | 1596 | /* |
Lee Schermerhorn | 846a16b | 2008-04-28 02:13:09 -0700 | [diff] [blame] | 1597 | * If mpol_dup() sees current->cpuset == cpuset_being_rebound, then it |
Paul Jackson | 4225399 | 2006-01-08 01:01:59 -0800 | [diff] [blame] | 1598 | * rebinds the mempolicy its copying by calling mpol_rebind_policy() |
| 1599 | * with the mems_allowed returned by cpuset_mems_allowed(). This |
| 1600 | * keeps mempolicies cpuset relative after its cpuset moves. See |
| 1601 | * further kernel/cpuset.c update_nodemask(). |
| 1602 | */ |
Paul Jackson | 4225399 | 2006-01-08 01:01:59 -0800 | [diff] [blame] | 1603 | |
Lee Schermerhorn | 846a16b | 2008-04-28 02:13:09 -0700 | [diff] [blame] | 1604 | /* Slow path of a mempolicy duplicate */ |
| 1605 | struct mempolicy *__mpol_dup(struct mempolicy *old) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1606 | { |
| 1607 | struct mempolicy *new = kmem_cache_alloc(policy_cache, GFP_KERNEL); |
| 1608 | |
| 1609 | if (!new) |
| 1610 | return ERR_PTR(-ENOMEM); |
Paul Jackson | 4225399 | 2006-01-08 01:01:59 -0800 | [diff] [blame] | 1611 | if (current_cpuset_is_being_rebound()) { |
| 1612 | nodemask_t mems = cpuset_mems_allowed(current); |
| 1613 | mpol_rebind_policy(old, &mems); |
| 1614 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1615 | *new = *old; |
| 1616 | atomic_set(&new->refcnt, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1617 | return new; |
| 1618 | } |
| 1619 | |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 1620 | /* |
| 1621 | * If *frompol needs [has] an extra ref, copy *frompol to *tompol , |
| 1622 | * eliminate the * MPOL_F_* flags that require conditional ref and |
| 1623 | * [NOTE!!!] drop the extra ref. Not safe to reference *frompol directly |
| 1624 | * after return. Use the returned value. |
| 1625 | * |
| 1626 | * Allows use of a mempolicy for, e.g., multiple allocations with a single |
| 1627 | * policy lookup, even if the policy needs/has extra ref on lookup. |
| 1628 | * shmem_readahead needs this. |
| 1629 | */ |
| 1630 | struct mempolicy *__mpol_cond_copy(struct mempolicy *tompol, |
| 1631 | struct mempolicy *frompol) |
| 1632 | { |
| 1633 | if (!mpol_needs_cond_ref(frompol)) |
| 1634 | return frompol; |
| 1635 | |
| 1636 | *tompol = *frompol; |
| 1637 | tompol->flags &= ~MPOL_F_SHARED; /* copy doesn't need unref */ |
| 1638 | __mpol_put(frompol); |
| 1639 | return tompol; |
| 1640 | } |
| 1641 | |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 1642 | static int mpol_match_intent(const struct mempolicy *a, |
| 1643 | const struct mempolicy *b) |
| 1644 | { |
| 1645 | if (a->flags != b->flags) |
| 1646 | return 0; |
| 1647 | if (!mpol_store_user_nodemask(a)) |
| 1648 | return 1; |
| 1649 | return nodes_equal(a->w.user_nodemask, b->w.user_nodemask); |
| 1650 | } |
| 1651 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1652 | /* Slow path of a mempolicy comparison */ |
| 1653 | int __mpol_equal(struct mempolicy *a, struct mempolicy *b) |
| 1654 | { |
| 1655 | if (!a || !b) |
| 1656 | return 0; |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 1657 | if (a->mode != b->mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1658 | return 0; |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 1659 | if (a->mode != MPOL_DEFAULT && !mpol_match_intent(a, b)) |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 1660 | return 0; |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 1661 | switch (a->mode) { |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1662 | case MPOL_BIND: |
| 1663 | /* Fall through */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1664 | case MPOL_INTERLEAVE: |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 1665 | return nodes_equal(a->v.nodes, b->v.nodes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1666 | case MPOL_PREFERRED: |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 1667 | return a->v.preferred_node == b->v.preferred_node && |
| 1668 | a->flags == b->flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1669 | default: |
| 1670 | BUG(); |
| 1671 | return 0; |
| 1672 | } |
| 1673 | } |
| 1674 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1675 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1676 | * Shared memory backing store policy support. |
| 1677 | * |
| 1678 | * Remember policies even when nobody has shared memory mapped. |
| 1679 | * The policies are kept in Red-Black tree linked from the inode. |
| 1680 | * They are protected by the sp->lock spinlock, which should be held |
| 1681 | * for any accesses to the tree. |
| 1682 | */ |
| 1683 | |
| 1684 | /* lookup first element intersecting start-end */ |
| 1685 | /* Caller holds sp->lock */ |
| 1686 | static struct sp_node * |
| 1687 | sp_lookup(struct shared_policy *sp, unsigned long start, unsigned long end) |
| 1688 | { |
| 1689 | struct rb_node *n = sp->root.rb_node; |
| 1690 | |
| 1691 | while (n) { |
| 1692 | struct sp_node *p = rb_entry(n, struct sp_node, nd); |
| 1693 | |
| 1694 | if (start >= p->end) |
| 1695 | n = n->rb_right; |
| 1696 | else if (end <= p->start) |
| 1697 | n = n->rb_left; |
| 1698 | else |
| 1699 | break; |
| 1700 | } |
| 1701 | if (!n) |
| 1702 | return NULL; |
| 1703 | for (;;) { |
| 1704 | struct sp_node *w = NULL; |
| 1705 | struct rb_node *prev = rb_prev(n); |
| 1706 | if (!prev) |
| 1707 | break; |
| 1708 | w = rb_entry(prev, struct sp_node, nd); |
| 1709 | if (w->end <= start) |
| 1710 | break; |
| 1711 | n = prev; |
| 1712 | } |
| 1713 | return rb_entry(n, struct sp_node, nd); |
| 1714 | } |
| 1715 | |
| 1716 | /* Insert a new shared policy into the list. */ |
| 1717 | /* Caller holds sp->lock */ |
| 1718 | static void sp_insert(struct shared_policy *sp, struct sp_node *new) |
| 1719 | { |
| 1720 | struct rb_node **p = &sp->root.rb_node; |
| 1721 | struct rb_node *parent = NULL; |
| 1722 | struct sp_node *nd; |
| 1723 | |
| 1724 | while (*p) { |
| 1725 | parent = *p; |
| 1726 | nd = rb_entry(parent, struct sp_node, nd); |
| 1727 | if (new->start < nd->start) |
| 1728 | p = &(*p)->rb_left; |
| 1729 | else if (new->end > nd->end) |
| 1730 | p = &(*p)->rb_right; |
| 1731 | else |
| 1732 | BUG(); |
| 1733 | } |
| 1734 | rb_link_node(&new->nd, parent, p); |
| 1735 | rb_insert_color(&new->nd, &sp->root); |
Paul Mundt | 140d5a4 | 2007-07-15 23:38:16 -0700 | [diff] [blame] | 1736 | pr_debug("inserting %lx-%lx: %d\n", new->start, new->end, |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 1737 | new->policy ? new->policy->mode : 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1738 | } |
| 1739 | |
| 1740 | /* Find shared policy intersecting idx */ |
| 1741 | struct mempolicy * |
| 1742 | mpol_shared_policy_lookup(struct shared_policy *sp, unsigned long idx) |
| 1743 | { |
| 1744 | struct mempolicy *pol = NULL; |
| 1745 | struct sp_node *sn; |
| 1746 | |
| 1747 | if (!sp->root.rb_node) |
| 1748 | return NULL; |
| 1749 | spin_lock(&sp->lock); |
| 1750 | sn = sp_lookup(sp, idx, idx+1); |
| 1751 | if (sn) { |
| 1752 | mpol_get(sn->policy); |
| 1753 | pol = sn->policy; |
| 1754 | } |
| 1755 | spin_unlock(&sp->lock); |
| 1756 | return pol; |
| 1757 | } |
| 1758 | |
| 1759 | static void sp_delete(struct shared_policy *sp, struct sp_node *n) |
| 1760 | { |
Paul Mundt | 140d5a4 | 2007-07-15 23:38:16 -0700 | [diff] [blame] | 1761 | pr_debug("deleting %lx-l%lx\n", n->start, n->end); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1762 | rb_erase(&n->nd, &sp->root); |
Lee Schermerhorn | f0be3d3 | 2008-04-28 02:13:08 -0700 | [diff] [blame] | 1763 | mpol_put(n->policy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1764 | kmem_cache_free(sn_cache, n); |
| 1765 | } |
| 1766 | |
Adrian Bunk | dbcb0f1 | 2007-10-16 01:26:26 -0700 | [diff] [blame] | 1767 | static struct sp_node *sp_alloc(unsigned long start, unsigned long end, |
| 1768 | struct mempolicy *pol) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1769 | { |
| 1770 | struct sp_node *n = kmem_cache_alloc(sn_cache, GFP_KERNEL); |
| 1771 | |
| 1772 | if (!n) |
| 1773 | return NULL; |
| 1774 | n->start = start; |
| 1775 | n->end = end; |
| 1776 | mpol_get(pol); |
Lee Schermerhorn | aab0b10 | 2008-04-28 02:13:13 -0700 | [diff] [blame] | 1777 | pol->flags |= MPOL_F_SHARED; /* for unref */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1778 | n->policy = pol; |
| 1779 | return n; |
| 1780 | } |
| 1781 | |
| 1782 | /* Replace a policy range. */ |
| 1783 | static int shared_policy_replace(struct shared_policy *sp, unsigned long start, |
| 1784 | unsigned long end, struct sp_node *new) |
| 1785 | { |
| 1786 | struct sp_node *n, *new2 = NULL; |
| 1787 | |
| 1788 | restart: |
| 1789 | spin_lock(&sp->lock); |
| 1790 | n = sp_lookup(sp, start, end); |
| 1791 | /* Take care of old policies in the same range. */ |
| 1792 | while (n && n->start < end) { |
| 1793 | struct rb_node *next = rb_next(&n->nd); |
| 1794 | if (n->start >= start) { |
| 1795 | if (n->end <= end) |
| 1796 | sp_delete(sp, n); |
| 1797 | else |
| 1798 | n->start = end; |
| 1799 | } else { |
| 1800 | /* Old policy spanning whole new range. */ |
| 1801 | if (n->end > end) { |
| 1802 | if (!new2) { |
| 1803 | spin_unlock(&sp->lock); |
| 1804 | new2 = sp_alloc(end, n->end, n->policy); |
| 1805 | if (!new2) |
| 1806 | return -ENOMEM; |
| 1807 | goto restart; |
| 1808 | } |
| 1809 | n->end = start; |
| 1810 | sp_insert(sp, new2); |
| 1811 | new2 = NULL; |
| 1812 | break; |
| 1813 | } else |
| 1814 | n->end = start; |
| 1815 | } |
| 1816 | if (!next) |
| 1817 | break; |
| 1818 | n = rb_entry(next, struct sp_node, nd); |
| 1819 | } |
| 1820 | if (new) |
| 1821 | sp_insert(sp, new); |
| 1822 | spin_unlock(&sp->lock); |
| 1823 | if (new2) { |
Lee Schermerhorn | f0be3d3 | 2008-04-28 02:13:08 -0700 | [diff] [blame] | 1824 | mpol_put(new2->policy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1825 | kmem_cache_free(sn_cache, new2); |
| 1826 | } |
| 1827 | return 0; |
| 1828 | } |
| 1829 | |
David Rientjes | a3b51e0 | 2008-04-28 02:12:23 -0700 | [diff] [blame] | 1830 | void mpol_shared_policy_init(struct shared_policy *info, unsigned short policy, |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 1831 | unsigned short flags, nodemask_t *policy_nodes) |
Robin Holt | 7339ff8 | 2006-01-14 13:20:48 -0800 | [diff] [blame] | 1832 | { |
| 1833 | info->root = RB_ROOT; |
| 1834 | spin_lock_init(&info->lock); |
| 1835 | |
| 1836 | if (policy != MPOL_DEFAULT) { |
| 1837 | struct mempolicy *newpol; |
| 1838 | |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 1839 | /* Falls back to NULL policy [MPOL_DEFAULT] on any error */ |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 1840 | newpol = mpol_new(policy, flags, policy_nodes); |
Robin Holt | 7339ff8 | 2006-01-14 13:20:48 -0800 | [diff] [blame] | 1841 | if (!IS_ERR(newpol)) { |
| 1842 | /* Create pseudo-vma that contains just the policy */ |
| 1843 | struct vm_area_struct pvma; |
| 1844 | |
| 1845 | memset(&pvma, 0, sizeof(struct vm_area_struct)); |
| 1846 | /* Policy covers entire file */ |
| 1847 | pvma.vm_end = TASK_SIZE; |
| 1848 | mpol_set_shared_policy(info, &pvma, newpol); |
Lee Schermerhorn | f0be3d3 | 2008-04-28 02:13:08 -0700 | [diff] [blame] | 1849 | mpol_put(newpol); |
Robin Holt | 7339ff8 | 2006-01-14 13:20:48 -0800 | [diff] [blame] | 1850 | } |
| 1851 | } |
| 1852 | } |
| 1853 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1854 | int mpol_set_shared_policy(struct shared_policy *info, |
| 1855 | struct vm_area_struct *vma, struct mempolicy *npol) |
| 1856 | { |
| 1857 | int err; |
| 1858 | struct sp_node *new = NULL; |
| 1859 | unsigned long sz = vma_pages(vma); |
| 1860 | |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 1861 | pr_debug("set_shared_policy %lx sz %lu %d %d %lx\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1862 | vma->vm_pgoff, |
Lee Schermerhorn | 45c4745 | 2008-04-28 02:13:12 -0700 | [diff] [blame] | 1863 | sz, npol ? npol->mode : -1, |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 1864 | npol ? npol->flags : -1, |
Paul Mundt | 140d5a4 | 2007-07-15 23:38:16 -0700 | [diff] [blame] | 1865 | npol ? nodes_addr(npol->v.nodes)[0] : -1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1866 | |
| 1867 | if (npol) { |
| 1868 | new = sp_alloc(vma->vm_pgoff, vma->vm_pgoff + sz, npol); |
| 1869 | if (!new) |
| 1870 | return -ENOMEM; |
| 1871 | } |
| 1872 | err = shared_policy_replace(info, vma->vm_pgoff, vma->vm_pgoff+sz, new); |
| 1873 | if (err && new) |
| 1874 | kmem_cache_free(sn_cache, new); |
| 1875 | return err; |
| 1876 | } |
| 1877 | |
| 1878 | /* Free a backing policy store on inode delete. */ |
| 1879 | void mpol_free_shared_policy(struct shared_policy *p) |
| 1880 | { |
| 1881 | struct sp_node *n; |
| 1882 | struct rb_node *next; |
| 1883 | |
| 1884 | if (!p->root.rb_node) |
| 1885 | return; |
| 1886 | spin_lock(&p->lock); |
| 1887 | next = rb_first(&p->root); |
| 1888 | while (next) { |
| 1889 | n = rb_entry(next, struct sp_node, nd); |
| 1890 | next = rb_next(&n->nd); |
Andi Kleen | 90c5029 | 2005-07-27 11:43:50 -0700 | [diff] [blame] | 1891 | rb_erase(&n->nd, &p->root); |
Lee Schermerhorn | f0be3d3 | 2008-04-28 02:13:08 -0700 | [diff] [blame] | 1892 | mpol_put(n->policy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1893 | kmem_cache_free(sn_cache, n); |
| 1894 | } |
| 1895 | spin_unlock(&p->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1896 | } |
| 1897 | |
| 1898 | /* assumes fs == KERNEL_DS */ |
| 1899 | void __init numa_policy_init(void) |
| 1900 | { |
Paul Mundt | b71636e | 2007-07-15 23:38:15 -0700 | [diff] [blame] | 1901 | nodemask_t interleave_nodes; |
| 1902 | unsigned long largest = 0; |
| 1903 | int nid, prefer = 0; |
| 1904 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1905 | policy_cache = kmem_cache_create("numa_policy", |
| 1906 | sizeof(struct mempolicy), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1907 | 0, SLAB_PANIC, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1908 | |
| 1909 | sn_cache = kmem_cache_create("shared_policy_node", |
| 1910 | sizeof(struct sp_node), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1911 | 0, SLAB_PANIC, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1912 | |
Paul Mundt | b71636e | 2007-07-15 23:38:15 -0700 | [diff] [blame] | 1913 | /* |
| 1914 | * Set interleaving policy for system init. Interleaving is only |
| 1915 | * enabled across suitably sized nodes (default is >= 16MB), or |
| 1916 | * fall back to the largest node if they're all smaller. |
| 1917 | */ |
| 1918 | nodes_clear(interleave_nodes); |
Christoph Lameter | 56bbd65 | 2007-10-16 01:25:35 -0700 | [diff] [blame] | 1919 | for_each_node_state(nid, N_HIGH_MEMORY) { |
Paul Mundt | b71636e | 2007-07-15 23:38:15 -0700 | [diff] [blame] | 1920 | unsigned long total_pages = node_present_pages(nid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1921 | |
Paul Mundt | b71636e | 2007-07-15 23:38:15 -0700 | [diff] [blame] | 1922 | /* Preserve the largest node */ |
| 1923 | if (largest < total_pages) { |
| 1924 | largest = total_pages; |
| 1925 | prefer = nid; |
| 1926 | } |
| 1927 | |
| 1928 | /* Interleave this node? */ |
| 1929 | if ((total_pages << PAGE_SHIFT) >= (16 << 20)) |
| 1930 | node_set(nid, interleave_nodes); |
| 1931 | } |
| 1932 | |
| 1933 | /* All too small, use the largest */ |
| 1934 | if (unlikely(nodes_empty(interleave_nodes))) |
| 1935 | node_set(prefer, interleave_nodes); |
| 1936 | |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 1937 | if (do_set_mempolicy(MPOL_INTERLEAVE, 0, &interleave_nodes)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1938 | printk("numa_policy_init: interleaving failed\n"); |
| 1939 | } |
| 1940 | |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1941 | /* Reset policy of current process to default */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1942 | void numa_default_policy(void) |
| 1943 | { |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 1944 | do_set_mempolicy(MPOL_DEFAULT, 0, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1945 | } |
Paul Jackson | 68860ec | 2005-10-30 15:02:36 -0800 | [diff] [blame] | 1946 | |
Paul Jackson | 4225399 | 2006-01-08 01:01:59 -0800 | [diff] [blame] | 1947 | /* |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 1948 | * "local" is pseudo-policy: MPOL_PREFERRED with MPOL_F_LOCAL flag |
Lee Schermerhorn | 53f2556 | 2008-04-28 02:13:20 -0700 | [diff] [blame] | 1949 | * Used only for mpol_to_str() |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 1950 | */ |
Lee Schermerhorn | 53f2556 | 2008-04-28 02:13:20 -0700 | [diff] [blame] | 1951 | #define MPOL_LOCAL (MPOL_INTERLEAVE + 1) |
Helge Deller | 15ad7cd | 2006-12-06 20:40:36 -0800 | [diff] [blame] | 1952 | static const char * const policy_types[] = |
Lee Schermerhorn | 53f2556 | 2008-04-28 02:13:20 -0700 | [diff] [blame] | 1953 | { "default", "prefer", "bind", "interleave", "local" }; |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 1954 | |
| 1955 | /* |
| 1956 | * Convert a mempolicy into a string. |
| 1957 | * Returns the number of characters in buffer (if positive) |
| 1958 | * or an error (negative) |
| 1959 | */ |
| 1960 | static inline int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol) |
| 1961 | { |
| 1962 | char *p = buffer; |
| 1963 | int l; |
| 1964 | nodemask_t nodes; |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 1965 | unsigned short mode; |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 1966 | unsigned short flags = pol ? pol->flags : 0; |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 1967 | |
Lee Schermerhorn | 2291990 | 2008-04-28 02:13:22 -0700 | [diff] [blame^] | 1968 | /* |
| 1969 | * Sanity check: room for longest mode, flag and some nodes |
| 1970 | */ |
| 1971 | VM_BUG_ON(maxlen < strlen("interleave") + strlen("relative") + 16); |
| 1972 | |
Lee Schermerhorn | bea904d | 2008-04-28 02:13:18 -0700 | [diff] [blame] | 1973 | if (!pol || pol == &default_policy) |
| 1974 | mode = MPOL_DEFAULT; |
| 1975 | else |
| 1976 | mode = pol->mode; |
| 1977 | |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 1978 | switch (mode) { |
| 1979 | case MPOL_DEFAULT: |
| 1980 | nodes_clear(nodes); |
| 1981 | break; |
| 1982 | |
| 1983 | case MPOL_PREFERRED: |
| 1984 | nodes_clear(nodes); |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 1985 | if (flags & MPOL_F_LOCAL) |
Lee Schermerhorn | 53f2556 | 2008-04-28 02:13:20 -0700 | [diff] [blame] | 1986 | mode = MPOL_LOCAL; /* pseudo-policy */ |
| 1987 | else |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 1988 | node_set(pol->v.preferred_node, nodes); |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 1989 | break; |
| 1990 | |
| 1991 | case MPOL_BIND: |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1992 | /* Fall through */ |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 1993 | case MPOL_INTERLEAVE: |
| 1994 | nodes = pol->v.nodes; |
| 1995 | break; |
| 1996 | |
| 1997 | default: |
| 1998 | BUG(); |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 1999 | } |
| 2000 | |
| 2001 | l = strlen(policy_types[mode]); |
Lee Schermerhorn | 53f2556 | 2008-04-28 02:13:20 -0700 | [diff] [blame] | 2002 | if (buffer + maxlen < p + l + 1) |
| 2003 | return -ENOSPC; |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2004 | |
| 2005 | strcpy(p, policy_types[mode]); |
| 2006 | p += l; |
| 2007 | |
Lee Schermerhorn | fc36b8d | 2008-04-28 02:13:21 -0700 | [diff] [blame] | 2008 | if (flags & MPOL_MODE_FLAGS) { |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 2009 | if (buffer + maxlen < p + 2) |
| 2010 | return -ENOSPC; |
| 2011 | *p++ = '='; |
| 2012 | |
Lee Schermerhorn | 2291990 | 2008-04-28 02:13:22 -0700 | [diff] [blame^] | 2013 | /* |
| 2014 | * Currently, the only defined flags are mutually exclusive |
| 2015 | */ |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 2016 | if (flags & MPOL_F_STATIC_NODES) |
Lee Schermerhorn | 2291990 | 2008-04-28 02:13:22 -0700 | [diff] [blame^] | 2017 | p += snprintf(p, buffer + maxlen - p, "static"); |
| 2018 | else if (flags & MPOL_F_RELATIVE_NODES) |
| 2019 | p += snprintf(p, buffer + maxlen - p, "relative"); |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 2020 | } |
| 2021 | |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2022 | if (!nodes_empty(nodes)) { |
| 2023 | if (buffer + maxlen < p + 2) |
| 2024 | return -ENOSPC; |
| 2025 | *p++ = '='; |
| 2026 | p += nodelist_scnprintf(p, buffer + maxlen - p, nodes); |
| 2027 | } |
| 2028 | return p - buffer; |
| 2029 | } |
| 2030 | |
| 2031 | struct numa_maps { |
| 2032 | unsigned long pages; |
| 2033 | unsigned long anon; |
Christoph Lameter | 397874d | 2006-03-06 15:42:53 -0800 | [diff] [blame] | 2034 | unsigned long active; |
| 2035 | unsigned long writeback; |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2036 | unsigned long mapcount_max; |
Christoph Lameter | 397874d | 2006-03-06 15:42:53 -0800 | [diff] [blame] | 2037 | unsigned long dirty; |
| 2038 | unsigned long swapcache; |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2039 | unsigned long node[MAX_NUMNODES]; |
| 2040 | }; |
| 2041 | |
Christoph Lameter | 397874d | 2006-03-06 15:42:53 -0800 | [diff] [blame] | 2042 | static void gather_stats(struct page *page, void *private, int pte_dirty) |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2043 | { |
| 2044 | struct numa_maps *md = private; |
| 2045 | int count = page_mapcount(page); |
| 2046 | |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2047 | md->pages++; |
Christoph Lameter | 397874d | 2006-03-06 15:42:53 -0800 | [diff] [blame] | 2048 | if (pte_dirty || PageDirty(page)) |
| 2049 | md->dirty++; |
| 2050 | |
| 2051 | if (PageSwapCache(page)) |
| 2052 | md->swapcache++; |
| 2053 | |
| 2054 | if (PageActive(page)) |
| 2055 | md->active++; |
| 2056 | |
| 2057 | if (PageWriteback(page)) |
| 2058 | md->writeback++; |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2059 | |
| 2060 | if (PageAnon(page)) |
| 2061 | md->anon++; |
| 2062 | |
Christoph Lameter | 397874d | 2006-03-06 15:42:53 -0800 | [diff] [blame] | 2063 | if (count > md->mapcount_max) |
| 2064 | md->mapcount_max = count; |
| 2065 | |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2066 | md->node[page_to_nid(page)]++; |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2067 | } |
| 2068 | |
Andrew Morton | 7f709ed | 2006-03-07 21:55:22 -0800 | [diff] [blame] | 2069 | #ifdef CONFIG_HUGETLB_PAGE |
Christoph Lameter | 397874d | 2006-03-06 15:42:53 -0800 | [diff] [blame] | 2070 | static void check_huge_range(struct vm_area_struct *vma, |
| 2071 | unsigned long start, unsigned long end, |
| 2072 | struct numa_maps *md) |
| 2073 | { |
| 2074 | unsigned long addr; |
| 2075 | struct page *page; |
| 2076 | |
| 2077 | for (addr = start; addr < end; addr += HPAGE_SIZE) { |
| 2078 | pte_t *ptep = huge_pte_offset(vma->vm_mm, addr & HPAGE_MASK); |
| 2079 | pte_t pte; |
| 2080 | |
| 2081 | if (!ptep) |
| 2082 | continue; |
| 2083 | |
| 2084 | pte = *ptep; |
| 2085 | if (pte_none(pte)) |
| 2086 | continue; |
| 2087 | |
| 2088 | page = pte_page(pte); |
| 2089 | if (!page) |
| 2090 | continue; |
| 2091 | |
| 2092 | gather_stats(page, md, pte_dirty(*ptep)); |
| 2093 | } |
| 2094 | } |
Andrew Morton | 7f709ed | 2006-03-07 21:55:22 -0800 | [diff] [blame] | 2095 | #else |
| 2096 | static inline void check_huge_range(struct vm_area_struct *vma, |
| 2097 | unsigned long start, unsigned long end, |
| 2098 | struct numa_maps *md) |
| 2099 | { |
| 2100 | } |
| 2101 | #endif |
Christoph Lameter | 397874d | 2006-03-06 15:42:53 -0800 | [diff] [blame] | 2102 | |
Lee Schermerhorn | 53f2556 | 2008-04-28 02:13:20 -0700 | [diff] [blame] | 2103 | /* |
| 2104 | * Display pages allocated per node and memory policy via /proc. |
| 2105 | */ |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2106 | int show_numa_map(struct seq_file *m, void *v) |
| 2107 | { |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2108 | struct proc_maps_private *priv = m->private; |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2109 | struct vm_area_struct *vma = v; |
| 2110 | struct numa_maps *md; |
Christoph Lameter | 397874d | 2006-03-06 15:42:53 -0800 | [diff] [blame] | 2111 | struct file *file = vma->vm_file; |
| 2112 | struct mm_struct *mm = vma->vm_mm; |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 2113 | struct mempolicy *pol; |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2114 | int n; |
| 2115 | char buffer[50]; |
| 2116 | |
Christoph Lameter | 397874d | 2006-03-06 15:42:53 -0800 | [diff] [blame] | 2117 | if (!mm) |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2118 | return 0; |
| 2119 | |
| 2120 | md = kzalloc(sizeof(struct numa_maps), GFP_KERNEL); |
| 2121 | if (!md) |
| 2122 | return 0; |
| 2123 | |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 2124 | pol = get_vma_policy(priv->task, vma, vma->vm_start); |
| 2125 | mpol_to_str(buffer, sizeof(buffer), pol); |
Lee Schermerhorn | 52cd3b0 | 2008-04-28 02:13:16 -0700 | [diff] [blame] | 2126 | mpol_cond_put(pol); |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2127 | |
Christoph Lameter | 397874d | 2006-03-06 15:42:53 -0800 | [diff] [blame] | 2128 | seq_printf(m, "%08lx %s", vma->vm_start, buffer); |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2129 | |
Christoph Lameter | 397874d | 2006-03-06 15:42:53 -0800 | [diff] [blame] | 2130 | if (file) { |
| 2131 | seq_printf(m, " file="); |
Jan Blunck | c32c2f6 | 2008-02-14 19:38:43 -0800 | [diff] [blame] | 2132 | seq_path(m, &file->f_path, "\n\t= "); |
Christoph Lameter | 397874d | 2006-03-06 15:42:53 -0800 | [diff] [blame] | 2133 | } else if (vma->vm_start <= mm->brk && vma->vm_end >= mm->start_brk) { |
| 2134 | seq_printf(m, " heap"); |
| 2135 | } else if (vma->vm_start <= mm->start_stack && |
| 2136 | vma->vm_end >= mm->start_stack) { |
| 2137 | seq_printf(m, " stack"); |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2138 | } |
Christoph Lameter | 397874d | 2006-03-06 15:42:53 -0800 | [diff] [blame] | 2139 | |
| 2140 | if (is_vm_hugetlb_page(vma)) { |
| 2141 | check_huge_range(vma, vma->vm_start, vma->vm_end, md); |
| 2142 | seq_printf(m, " huge"); |
| 2143 | } else { |
| 2144 | check_pgd_range(vma, vma->vm_start, vma->vm_end, |
Christoph Lameter | 56bbd65 | 2007-10-16 01:25:35 -0700 | [diff] [blame] | 2145 | &node_states[N_HIGH_MEMORY], MPOL_MF_STATS, md); |
Christoph Lameter | 397874d | 2006-03-06 15:42:53 -0800 | [diff] [blame] | 2146 | } |
| 2147 | |
| 2148 | if (!md->pages) |
| 2149 | goto out; |
| 2150 | |
| 2151 | if (md->anon) |
| 2152 | seq_printf(m," anon=%lu",md->anon); |
| 2153 | |
| 2154 | if (md->dirty) |
| 2155 | seq_printf(m," dirty=%lu",md->dirty); |
| 2156 | |
| 2157 | if (md->pages != md->anon && md->pages != md->dirty) |
| 2158 | seq_printf(m, " mapped=%lu", md->pages); |
| 2159 | |
| 2160 | if (md->mapcount_max > 1) |
| 2161 | seq_printf(m, " mapmax=%lu", md->mapcount_max); |
| 2162 | |
| 2163 | if (md->swapcache) |
| 2164 | seq_printf(m," swapcache=%lu", md->swapcache); |
| 2165 | |
| 2166 | if (md->active < md->pages && !is_vm_hugetlb_page(vma)) |
| 2167 | seq_printf(m," active=%lu", md->active); |
| 2168 | |
| 2169 | if (md->writeback) |
| 2170 | seq_printf(m," writeback=%lu", md->writeback); |
| 2171 | |
Christoph Lameter | 56bbd65 | 2007-10-16 01:25:35 -0700 | [diff] [blame] | 2172 | for_each_node_state(n, N_HIGH_MEMORY) |
Christoph Lameter | 397874d | 2006-03-06 15:42:53 -0800 | [diff] [blame] | 2173 | if (md->node[n]) |
| 2174 | seq_printf(m, " N%d=%lu", n, md->node[n]); |
| 2175 | out: |
| 2176 | seq_putc(m, '\n'); |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2177 | kfree(md); |
| 2178 | |
| 2179 | if (m->count < m->size) |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2180 | m->version = (vma != priv->tail_vma) ? vma->vm_start : 0; |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2181 | return 0; |
| 2182 | } |