Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Simple NUMA memory policy for the Linux kernel. | |
3 | * | |
4 | * Copyright 2003,2004 Andi Kleen, SuSE Labs. | |
8bccd85f | 5 | * (C) Copyright 2005 Christoph Lameter, Silicon Graphics, Inc. |
1da177e4 LT |
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. | |
8bccd85f | 21 | * |
1da177e4 LT |
22 | * bind Only allocate memory on a specific set of nodes, |
23 | * no fallback. | |
8bccd85f CL |
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 | * | |
1da177e4 LT |
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. | |
8bccd85f | 33 | * |
1da177e4 LT |
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. | |
1da177e4 LT |
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> | |
1da177e4 LT |
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> | |
b488893a | 80 | #include <linux/nsproxy.h> |
1da177e4 LT |
81 | #include <linux/interrupt.h> |
82 | #include <linux/init.h> | |
83 | #include <linux/compat.h> | |
dc9aa5b9 | 84 | #include <linux/swap.h> |
1a75a6c8 CL |
85 | #include <linux/seq_file.h> |
86 | #include <linux/proc_fs.h> | |
b20a3503 | 87 | #include <linux/migrate.h> |
95a402c3 | 88 | #include <linux/rmap.h> |
86c3a764 | 89 | #include <linux/security.h> |
dbcb0f19 | 90 | #include <linux/syscalls.h> |
dc9aa5b9 | 91 | |
1da177e4 LT |
92 | #include <asm/tlbflush.h> |
93 | #include <asm/uaccess.h> | |
94 | ||
38e35860 | 95 | /* Internal flags */ |
dc9aa5b9 | 96 | #define MPOL_MF_DISCONTIG_OK (MPOL_MF_INTERNAL << 0) /* Skip checks for continuous vmas */ |
38e35860 | 97 | #define MPOL_MF_INVERT (MPOL_MF_INTERNAL << 1) /* Invert check for nodemask */ |
1a75a6c8 | 98 | #define MPOL_MF_STATS (MPOL_MF_INTERNAL << 2) /* Gather statistics */ |
dc9aa5b9 | 99 | |
fcc234f8 PE |
100 | static struct kmem_cache *policy_cache; |
101 | static struct kmem_cache *sn_cache; | |
1da177e4 | 102 | |
1da177e4 LT |
103 | /* Highest zone. An specific allocation for a zone below that is not |
104 | policied. */ | |
6267276f | 105 | enum zone_type policy_zone = 0; |
1da177e4 | 106 | |
d42c6997 | 107 | struct mempolicy default_policy = { |
1da177e4 | 108 | .refcnt = ATOMIC_INIT(1), /* never free it */ |
45c4745a | 109 | .mode = MPOL_DEFAULT, |
1da177e4 LT |
110 | }; |
111 | ||
37012946 DR |
112 | static const struct mempolicy_operations { |
113 | int (*create)(struct mempolicy *pol, const nodemask_t *nodes); | |
114 | void (*rebind)(struct mempolicy *pol, const nodemask_t *nodes); | |
115 | } mpol_ops[MPOL_MAX]; | |
116 | ||
19770b32 | 117 | /* Check that the nodemask contains at least one populated zone */ |
37012946 | 118 | static int is_valid_nodemask(const nodemask_t *nodemask) |
1da177e4 | 119 | { |
19770b32 | 120 | int nd, k; |
1da177e4 | 121 | |
19770b32 MG |
122 | /* Check that there is something useful in this mask */ |
123 | k = policy_zone; | |
124 | ||
125 | for_each_node_mask(nd, *nodemask) { | |
126 | struct zone *z; | |
127 | ||
128 | for (k = 0; k <= policy_zone; k++) { | |
129 | z = &NODE_DATA(nd)->node_zones[k]; | |
130 | if (z->present_pages > 0) | |
131 | return 1; | |
dd942ae3 | 132 | } |
8af5e2eb | 133 | } |
19770b32 MG |
134 | |
135 | return 0; | |
1da177e4 LT |
136 | } |
137 | ||
f5b087b5 DR |
138 | static inline int mpol_store_user_nodemask(const struct mempolicy *pol) |
139 | { | |
4c50bc01 DR |
140 | return pol->flags & (MPOL_F_STATIC_NODES | MPOL_F_RELATIVE_NODES); |
141 | } | |
142 | ||
143 | static void mpol_relative_nodemask(nodemask_t *ret, const nodemask_t *orig, | |
144 | const nodemask_t *rel) | |
145 | { | |
146 | nodemask_t tmp; | |
147 | nodes_fold(tmp, *orig, nodes_weight(*rel)); | |
148 | nodes_onto(*ret, tmp, *rel); | |
f5b087b5 DR |
149 | } |
150 | ||
37012946 DR |
151 | static int mpol_new_interleave(struct mempolicy *pol, const nodemask_t *nodes) |
152 | { | |
153 | if (nodes_empty(*nodes)) | |
154 | return -EINVAL; | |
155 | pol->v.nodes = *nodes; | |
156 | return 0; | |
157 | } | |
158 | ||
159 | static int mpol_new_preferred(struct mempolicy *pol, const nodemask_t *nodes) | |
160 | { | |
161 | if (!nodes) | |
162 | pol->v.preferred_node = -1; /* local allocation */ | |
163 | else if (nodes_empty(*nodes)) | |
164 | return -EINVAL; /* no allowed nodes */ | |
165 | else | |
166 | pol->v.preferred_node = first_node(*nodes); | |
167 | return 0; | |
168 | } | |
169 | ||
170 | static int mpol_new_bind(struct mempolicy *pol, const nodemask_t *nodes) | |
171 | { | |
172 | if (!is_valid_nodemask(nodes)) | |
173 | return -EINVAL; | |
174 | pol->v.nodes = *nodes; | |
175 | return 0; | |
176 | } | |
177 | ||
1da177e4 | 178 | /* Create a new policy */ |
028fec41 DR |
179 | static struct mempolicy *mpol_new(unsigned short mode, unsigned short flags, |
180 | nodemask_t *nodes) | |
1da177e4 LT |
181 | { |
182 | struct mempolicy *policy; | |
f5b087b5 | 183 | nodemask_t cpuset_context_nmask; |
37012946 | 184 | int ret; |
1da177e4 | 185 | |
028fec41 DR |
186 | pr_debug("setting mode %d flags %d nodes[0] %lx\n", |
187 | mode, flags, nodes ? nodes_addr(*nodes)[0] : -1); | |
140d5a49 | 188 | |
3e1f0645 DR |
189 | if (mode == MPOL_DEFAULT) { |
190 | if (nodes && !nodes_empty(*nodes)) | |
37012946 | 191 | return ERR_PTR(-EINVAL); |
3e1f0645 | 192 | return NULL; |
37012946 | 193 | } |
3e1f0645 DR |
194 | VM_BUG_ON(!nodes); |
195 | ||
196 | /* | |
197 | * MPOL_PREFERRED cannot be used with MPOL_F_STATIC_NODES or | |
198 | * MPOL_F_RELATIVE_NODES if the nodemask is empty (local allocation). | |
199 | * All other modes require a valid pointer to a non-empty nodemask. | |
200 | */ | |
201 | if (mode == MPOL_PREFERRED) { | |
202 | if (nodes_empty(*nodes)) { | |
203 | if (((flags & MPOL_F_STATIC_NODES) || | |
204 | (flags & MPOL_F_RELATIVE_NODES))) | |
205 | return ERR_PTR(-EINVAL); | |
206 | nodes = NULL; /* flag local alloc */ | |
207 | } | |
208 | } else if (nodes_empty(*nodes)) | |
209 | return ERR_PTR(-EINVAL); | |
1da177e4 LT |
210 | policy = kmem_cache_alloc(policy_cache, GFP_KERNEL); |
211 | if (!policy) | |
212 | return ERR_PTR(-ENOMEM); | |
213 | atomic_set(&policy->refcnt, 1); | |
45c4745a | 214 | policy->mode = mode; |
3e1f0645 | 215 | policy->flags = flags; |
37012946 | 216 | |
3e1f0645 DR |
217 | if (nodes) { |
218 | /* | |
219 | * cpuset related setup doesn't apply to local allocation | |
220 | */ | |
37012946 DR |
221 | cpuset_update_task_memory_state(); |
222 | if (flags & MPOL_F_RELATIVE_NODES) | |
223 | mpol_relative_nodemask(&cpuset_context_nmask, nodes, | |
224 | &cpuset_current_mems_allowed); | |
225 | else | |
226 | nodes_and(cpuset_context_nmask, *nodes, | |
227 | cpuset_current_mems_allowed); | |
228 | if (mpol_store_user_nodemask(policy)) | |
229 | policy->w.user_nodemask = *nodes; | |
230 | else | |
231 | policy->w.cpuset_mems_allowed = | |
232 | cpuset_mems_allowed(current); | |
233 | } | |
234 | ||
235 | ret = mpol_ops[mode].create(policy, | |
3e1f0645 | 236 | nodes ? &cpuset_context_nmask : NULL); |
37012946 DR |
237 | if (ret < 0) { |
238 | kmem_cache_free(policy_cache, policy); | |
239 | return ERR_PTR(ret); | |
240 | } | |
1da177e4 | 241 | return policy; |
37012946 DR |
242 | } |
243 | ||
52cd3b07 LS |
244 | /* Slow path of a mpol destructor. */ |
245 | void __mpol_put(struct mempolicy *p) | |
246 | { | |
247 | if (!atomic_dec_and_test(&p->refcnt)) | |
248 | return; | |
249 | p->mode = MPOL_DEFAULT; | |
250 | kmem_cache_free(policy_cache, p); | |
251 | } | |
252 | ||
37012946 DR |
253 | static void mpol_rebind_default(struct mempolicy *pol, const nodemask_t *nodes) |
254 | { | |
255 | } | |
256 | ||
257 | static void mpol_rebind_nodemask(struct mempolicy *pol, | |
258 | const nodemask_t *nodes) | |
259 | { | |
260 | nodemask_t tmp; | |
261 | ||
262 | if (pol->flags & MPOL_F_STATIC_NODES) | |
263 | nodes_and(tmp, pol->w.user_nodemask, *nodes); | |
264 | else if (pol->flags & MPOL_F_RELATIVE_NODES) | |
265 | mpol_relative_nodemask(&tmp, &pol->w.user_nodemask, nodes); | |
266 | else { | |
267 | nodes_remap(tmp, pol->v.nodes, pol->w.cpuset_mems_allowed, | |
268 | *nodes); | |
269 | pol->w.cpuset_mems_allowed = *nodes; | |
270 | } | |
f5b087b5 | 271 | |
37012946 DR |
272 | pol->v.nodes = tmp; |
273 | if (!node_isset(current->il_next, tmp)) { | |
274 | current->il_next = next_node(current->il_next, tmp); | |
275 | if (current->il_next >= MAX_NUMNODES) | |
276 | current->il_next = first_node(tmp); | |
277 | if (current->il_next >= MAX_NUMNODES) | |
278 | current->il_next = numa_node_id(); | |
279 | } | |
280 | } | |
281 | ||
282 | static void mpol_rebind_preferred(struct mempolicy *pol, | |
283 | const nodemask_t *nodes) | |
284 | { | |
285 | nodemask_t tmp; | |
286 | ||
37012946 DR |
287 | if (pol->flags & MPOL_F_STATIC_NODES) { |
288 | int node = first_node(pol->w.user_nodemask); | |
289 | ||
290 | if (node_isset(node, *nodes)) | |
291 | pol->v.preferred_node = node; | |
292 | else | |
293 | pol->v.preferred_node = -1; | |
37012946 DR |
294 | } else if (pol->flags & MPOL_F_RELATIVE_NODES) { |
295 | mpol_relative_nodemask(&tmp, &pol->w.user_nodemask, nodes); | |
296 | pol->v.preferred_node = first_node(tmp); | |
3e1f0645 | 297 | } else if (pol->v.preferred_node != -1) { |
37012946 DR |
298 | pol->v.preferred_node = node_remap(pol->v.preferred_node, |
299 | pol->w.cpuset_mems_allowed, | |
300 | *nodes); | |
301 | pol->w.cpuset_mems_allowed = *nodes; | |
302 | } | |
1da177e4 LT |
303 | } |
304 | ||
1d0d2680 DR |
305 | /* Migrate a policy to a different set of nodes */ |
306 | static void mpol_rebind_policy(struct mempolicy *pol, | |
307 | const nodemask_t *newmask) | |
308 | { | |
1d0d2680 DR |
309 | if (!pol) |
310 | return; | |
1d0d2680 DR |
311 | if (!mpol_store_user_nodemask(pol) && |
312 | nodes_equal(pol->w.cpuset_mems_allowed, *newmask)) | |
313 | return; | |
45c4745a | 314 | mpol_ops[pol->mode].rebind(pol, newmask); |
1d0d2680 DR |
315 | } |
316 | ||
317 | /* | |
318 | * Wrapper for mpol_rebind_policy() that just requires task | |
319 | * pointer, and updates task mempolicy. | |
320 | */ | |
321 | ||
322 | void mpol_rebind_task(struct task_struct *tsk, const nodemask_t *new) | |
323 | { | |
324 | mpol_rebind_policy(tsk->mempolicy, new); | |
325 | } | |
326 | ||
327 | /* | |
328 | * Rebind each vma in mm to new nodemask. | |
329 | * | |
330 | * Call holding a reference to mm. Takes mm->mmap_sem during call. | |
331 | */ | |
332 | ||
333 | void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new) | |
334 | { | |
335 | struct vm_area_struct *vma; | |
336 | ||
337 | down_write(&mm->mmap_sem); | |
338 | for (vma = mm->mmap; vma; vma = vma->vm_next) | |
339 | mpol_rebind_policy(vma->vm_policy, new); | |
340 | up_write(&mm->mmap_sem); | |
341 | } | |
342 | ||
37012946 DR |
343 | static const struct mempolicy_operations mpol_ops[MPOL_MAX] = { |
344 | [MPOL_DEFAULT] = { | |
345 | .rebind = mpol_rebind_default, | |
346 | }, | |
347 | [MPOL_INTERLEAVE] = { | |
348 | .create = mpol_new_interleave, | |
349 | .rebind = mpol_rebind_nodemask, | |
350 | }, | |
351 | [MPOL_PREFERRED] = { | |
352 | .create = mpol_new_preferred, | |
353 | .rebind = mpol_rebind_preferred, | |
354 | }, | |
355 | [MPOL_BIND] = { | |
356 | .create = mpol_new_bind, | |
357 | .rebind = mpol_rebind_nodemask, | |
358 | }, | |
359 | }; | |
360 | ||
397874df | 361 | static void gather_stats(struct page *, void *, int pte_dirty); |
fc301289 CL |
362 | static void migrate_page_add(struct page *page, struct list_head *pagelist, |
363 | unsigned long flags); | |
1a75a6c8 | 364 | |
38e35860 | 365 | /* Scan through pages checking if pages follow certain conditions. */ |
b5810039 | 366 | static int check_pte_range(struct vm_area_struct *vma, pmd_t *pmd, |
dc9aa5b9 CL |
367 | unsigned long addr, unsigned long end, |
368 | const nodemask_t *nodes, unsigned long flags, | |
38e35860 | 369 | void *private) |
1da177e4 | 370 | { |
91612e0d HD |
371 | pte_t *orig_pte; |
372 | pte_t *pte; | |
705e87c0 | 373 | spinlock_t *ptl; |
941150a3 | 374 | |
705e87c0 | 375 | orig_pte = pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
91612e0d | 376 | do { |
6aab341e | 377 | struct page *page; |
25ba77c1 | 378 | int nid; |
91612e0d HD |
379 | |
380 | if (!pte_present(*pte)) | |
1da177e4 | 381 | continue; |
6aab341e LT |
382 | page = vm_normal_page(vma, addr, *pte); |
383 | if (!page) | |
1da177e4 | 384 | continue; |
053837fc NP |
385 | /* |
386 | * The check for PageReserved here is important to avoid | |
387 | * handling zero pages and other pages that may have been | |
388 | * marked special by the system. | |
389 | * | |
390 | * If the PageReserved would not be checked here then f.e. | |
391 | * the location of the zero page could have an influence | |
392 | * on MPOL_MF_STRICT, zero pages would be counted for | |
393 | * the per node stats, and there would be useless attempts | |
394 | * to put zero pages on the migration list. | |
395 | */ | |
f4598c8b CL |
396 | if (PageReserved(page)) |
397 | continue; | |
6aab341e | 398 | nid = page_to_nid(page); |
38e35860 CL |
399 | if (node_isset(nid, *nodes) == !!(flags & MPOL_MF_INVERT)) |
400 | continue; | |
401 | ||
1a75a6c8 | 402 | if (flags & MPOL_MF_STATS) |
397874df | 403 | gather_stats(page, private, pte_dirty(*pte)); |
053837fc | 404 | else if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) |
fc301289 | 405 | migrate_page_add(page, private, flags); |
38e35860 CL |
406 | else |
407 | break; | |
91612e0d | 408 | } while (pte++, addr += PAGE_SIZE, addr != end); |
705e87c0 | 409 | pte_unmap_unlock(orig_pte, ptl); |
91612e0d HD |
410 | return addr != end; |
411 | } | |
412 | ||
b5810039 | 413 | static inline int check_pmd_range(struct vm_area_struct *vma, pud_t *pud, |
dc9aa5b9 CL |
414 | unsigned long addr, unsigned long end, |
415 | const nodemask_t *nodes, unsigned long flags, | |
38e35860 | 416 | void *private) |
91612e0d HD |
417 | { |
418 | pmd_t *pmd; | |
419 | unsigned long next; | |
420 | ||
421 | pmd = pmd_offset(pud, addr); | |
422 | do { | |
423 | next = pmd_addr_end(addr, end); | |
424 | if (pmd_none_or_clear_bad(pmd)) | |
425 | continue; | |
dc9aa5b9 | 426 | if (check_pte_range(vma, pmd, addr, next, nodes, |
38e35860 | 427 | flags, private)) |
91612e0d HD |
428 | return -EIO; |
429 | } while (pmd++, addr = next, addr != end); | |
430 | return 0; | |
431 | } | |
432 | ||
b5810039 | 433 | static inline int check_pud_range(struct vm_area_struct *vma, pgd_t *pgd, |
dc9aa5b9 CL |
434 | unsigned long addr, unsigned long end, |
435 | const nodemask_t *nodes, unsigned long flags, | |
38e35860 | 436 | void *private) |
91612e0d HD |
437 | { |
438 | pud_t *pud; | |
439 | unsigned long next; | |
440 | ||
441 | pud = pud_offset(pgd, addr); | |
442 | do { | |
443 | next = pud_addr_end(addr, end); | |
444 | if (pud_none_or_clear_bad(pud)) | |
445 | continue; | |
dc9aa5b9 | 446 | if (check_pmd_range(vma, pud, addr, next, nodes, |
38e35860 | 447 | flags, private)) |
91612e0d HD |
448 | return -EIO; |
449 | } while (pud++, addr = next, addr != end); | |
450 | return 0; | |
451 | } | |
452 | ||
b5810039 | 453 | static inline int check_pgd_range(struct vm_area_struct *vma, |
dc9aa5b9 CL |
454 | unsigned long addr, unsigned long end, |
455 | const nodemask_t *nodes, unsigned long flags, | |
38e35860 | 456 | void *private) |
91612e0d HD |
457 | { |
458 | pgd_t *pgd; | |
459 | unsigned long next; | |
460 | ||
b5810039 | 461 | pgd = pgd_offset(vma->vm_mm, addr); |
91612e0d HD |
462 | do { |
463 | next = pgd_addr_end(addr, end); | |
464 | if (pgd_none_or_clear_bad(pgd)) | |
465 | continue; | |
dc9aa5b9 | 466 | if (check_pud_range(vma, pgd, addr, next, nodes, |
38e35860 | 467 | flags, private)) |
91612e0d HD |
468 | return -EIO; |
469 | } while (pgd++, addr = next, addr != end); | |
470 | return 0; | |
1da177e4 LT |
471 | } |
472 | ||
dc9aa5b9 CL |
473 | /* |
474 | * Check if all pages in a range are on a set of nodes. | |
475 | * If pagelist != NULL then isolate pages from the LRU and | |
476 | * put them on the pagelist. | |
477 | */ | |
1da177e4 LT |
478 | static struct vm_area_struct * |
479 | check_range(struct mm_struct *mm, unsigned long start, unsigned long end, | |
38e35860 | 480 | const nodemask_t *nodes, unsigned long flags, void *private) |
1da177e4 LT |
481 | { |
482 | int err; | |
483 | struct vm_area_struct *first, *vma, *prev; | |
484 | ||
90036ee5 | 485 | if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) { |
90036ee5 | 486 | |
b20a3503 CL |
487 | err = migrate_prep(); |
488 | if (err) | |
489 | return ERR_PTR(err); | |
90036ee5 | 490 | } |
053837fc | 491 | |
1da177e4 LT |
492 | first = find_vma(mm, start); |
493 | if (!first) | |
494 | return ERR_PTR(-EFAULT); | |
495 | prev = NULL; | |
496 | for (vma = first; vma && vma->vm_start < end; vma = vma->vm_next) { | |
dc9aa5b9 CL |
497 | if (!(flags & MPOL_MF_DISCONTIG_OK)) { |
498 | if (!vma->vm_next && vma->vm_end < end) | |
499 | return ERR_PTR(-EFAULT); | |
500 | if (prev && prev->vm_end < vma->vm_start) | |
501 | return ERR_PTR(-EFAULT); | |
502 | } | |
503 | if (!is_vm_hugetlb_page(vma) && | |
504 | ((flags & MPOL_MF_STRICT) || | |
505 | ((flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) && | |
506 | vma_migratable(vma)))) { | |
5b952b3c | 507 | unsigned long endvma = vma->vm_end; |
dc9aa5b9 | 508 | |
5b952b3c AK |
509 | if (endvma > end) |
510 | endvma = end; | |
511 | if (vma->vm_start > start) | |
512 | start = vma->vm_start; | |
dc9aa5b9 | 513 | err = check_pgd_range(vma, start, endvma, nodes, |
38e35860 | 514 | flags, private); |
1da177e4 LT |
515 | if (err) { |
516 | first = ERR_PTR(err); | |
517 | break; | |
518 | } | |
519 | } | |
520 | prev = vma; | |
521 | } | |
522 | return first; | |
523 | } | |
524 | ||
525 | /* Apply policy to a single VMA */ | |
526 | static int policy_vma(struct vm_area_struct *vma, struct mempolicy *new) | |
527 | { | |
528 | int err = 0; | |
529 | struct mempolicy *old = vma->vm_policy; | |
530 | ||
140d5a49 | 531 | pr_debug("vma %lx-%lx/%lx vm_ops %p vm_file %p set_policy %p\n", |
1da177e4 LT |
532 | vma->vm_start, vma->vm_end, vma->vm_pgoff, |
533 | vma->vm_ops, vma->vm_file, | |
534 | vma->vm_ops ? vma->vm_ops->set_policy : NULL); | |
535 | ||
536 | if (vma->vm_ops && vma->vm_ops->set_policy) | |
537 | err = vma->vm_ops->set_policy(vma, new); | |
538 | if (!err) { | |
539 | mpol_get(new); | |
540 | vma->vm_policy = new; | |
f0be3d32 | 541 | mpol_put(old); |
1da177e4 LT |
542 | } |
543 | return err; | |
544 | } | |
545 | ||
546 | /* Step 2: apply policy to a range and do splits. */ | |
547 | static int mbind_range(struct vm_area_struct *vma, unsigned long start, | |
548 | unsigned long end, struct mempolicy *new) | |
549 | { | |
550 | struct vm_area_struct *next; | |
551 | int err; | |
552 | ||
553 | err = 0; | |
554 | for (; vma && vma->vm_start < end; vma = next) { | |
555 | next = vma->vm_next; | |
556 | if (vma->vm_start < start) | |
557 | err = split_vma(vma->vm_mm, vma, start, 1); | |
558 | if (!err && vma->vm_end > end) | |
559 | err = split_vma(vma->vm_mm, vma, end, 0); | |
560 | if (!err) | |
561 | err = policy_vma(vma, new); | |
562 | if (err) | |
563 | break; | |
564 | } | |
565 | return err; | |
566 | } | |
567 | ||
c61afb18 PJ |
568 | /* |
569 | * Update task->flags PF_MEMPOLICY bit: set iff non-default | |
570 | * mempolicy. Allows more rapid checking of this (combined perhaps | |
571 | * with other PF_* flag bits) on memory allocation hot code paths. | |
572 | * | |
573 | * If called from outside this file, the task 'p' should -only- be | |
574 | * a newly forked child not yet visible on the task list, because | |
575 | * manipulating the task flags of a visible task is not safe. | |
576 | * | |
577 | * The above limitation is why this routine has the funny name | |
578 | * mpol_fix_fork_child_flag(). | |
579 | * | |
580 | * It is also safe to call this with a task pointer of current, | |
581 | * which the static wrapper mpol_set_task_struct_flag() does, | |
582 | * for use within this file. | |
583 | */ | |
584 | ||
585 | void mpol_fix_fork_child_flag(struct task_struct *p) | |
586 | { | |
587 | if (p->mempolicy) | |
588 | p->flags |= PF_MEMPOLICY; | |
589 | else | |
590 | p->flags &= ~PF_MEMPOLICY; | |
591 | } | |
592 | ||
593 | static void mpol_set_task_struct_flag(void) | |
594 | { | |
595 | mpol_fix_fork_child_flag(current); | |
596 | } | |
597 | ||
1da177e4 | 598 | /* Set the process memory policy */ |
028fec41 DR |
599 | static long do_set_mempolicy(unsigned short mode, unsigned short flags, |
600 | nodemask_t *nodes) | |
1da177e4 | 601 | { |
1da177e4 | 602 | struct mempolicy *new; |
f4e53d91 | 603 | struct mm_struct *mm = current->mm; |
1da177e4 | 604 | |
028fec41 | 605 | new = mpol_new(mode, flags, nodes); |
1da177e4 LT |
606 | if (IS_ERR(new)) |
607 | return PTR_ERR(new); | |
f4e53d91 LS |
608 | |
609 | /* | |
610 | * prevent changing our mempolicy while show_numa_maps() | |
611 | * is using it. | |
612 | * Note: do_set_mempolicy() can be called at init time | |
613 | * with no 'mm'. | |
614 | */ | |
615 | if (mm) | |
616 | down_write(&mm->mmap_sem); | |
f0be3d32 | 617 | mpol_put(current->mempolicy); |
1da177e4 | 618 | current->mempolicy = new; |
c61afb18 | 619 | mpol_set_task_struct_flag(); |
45c4745a | 620 | if (new && new->mode == MPOL_INTERLEAVE && |
f5b087b5 | 621 | nodes_weight(new->v.nodes)) |
dfcd3c0d | 622 | current->il_next = first_node(new->v.nodes); |
f4e53d91 LS |
623 | if (mm) |
624 | up_write(&mm->mmap_sem); | |
625 | ||
1da177e4 LT |
626 | return 0; |
627 | } | |
628 | ||
629 | /* Fill a zone bitmap for a policy */ | |
dfcd3c0d | 630 | static void get_zonemask(struct mempolicy *p, nodemask_t *nodes) |
1da177e4 | 631 | { |
dfcd3c0d | 632 | nodes_clear(*nodes); |
45c4745a | 633 | switch (p->mode) { |
1da177e4 LT |
634 | case MPOL_DEFAULT: |
635 | break; | |
19770b32 MG |
636 | case MPOL_BIND: |
637 | /* Fall through */ | |
1da177e4 | 638 | case MPOL_INTERLEAVE: |
dfcd3c0d | 639 | *nodes = p->v.nodes; |
1da177e4 LT |
640 | break; |
641 | case MPOL_PREFERRED: | |
56bbd65d | 642 | /* or use current node instead of memory_map? */ |
1da177e4 | 643 | if (p->v.preferred_node < 0) |
56bbd65d | 644 | *nodes = node_states[N_HIGH_MEMORY]; |
1da177e4 | 645 | else |
dfcd3c0d | 646 | node_set(p->v.preferred_node, *nodes); |
1da177e4 LT |
647 | break; |
648 | default: | |
649 | BUG(); | |
650 | } | |
651 | } | |
652 | ||
653 | static int lookup_node(struct mm_struct *mm, unsigned long addr) | |
654 | { | |
655 | struct page *p; | |
656 | int err; | |
657 | ||
658 | err = get_user_pages(current, mm, addr & PAGE_MASK, 1, 0, 0, &p, NULL); | |
659 | if (err >= 0) { | |
660 | err = page_to_nid(p); | |
661 | put_page(p); | |
662 | } | |
663 | return err; | |
664 | } | |
665 | ||
1da177e4 | 666 | /* Retrieve NUMA policy */ |
dbcb0f19 AB |
667 | static long do_get_mempolicy(int *policy, nodemask_t *nmask, |
668 | unsigned long addr, unsigned long flags) | |
1da177e4 | 669 | { |
8bccd85f | 670 | int err; |
1da177e4 LT |
671 | struct mm_struct *mm = current->mm; |
672 | struct vm_area_struct *vma = NULL; | |
673 | struct mempolicy *pol = current->mempolicy; | |
674 | ||
cf2a473c | 675 | cpuset_update_task_memory_state(); |
754af6f5 LS |
676 | if (flags & |
677 | ~(unsigned long)(MPOL_F_NODE|MPOL_F_ADDR|MPOL_F_MEMS_ALLOWED)) | |
1da177e4 | 678 | return -EINVAL; |
754af6f5 LS |
679 | |
680 | if (flags & MPOL_F_MEMS_ALLOWED) { | |
681 | if (flags & (MPOL_F_NODE|MPOL_F_ADDR)) | |
682 | return -EINVAL; | |
683 | *policy = 0; /* just so it's initialized */ | |
684 | *nmask = cpuset_current_mems_allowed; | |
685 | return 0; | |
686 | } | |
687 | ||
1da177e4 LT |
688 | if (flags & MPOL_F_ADDR) { |
689 | down_read(&mm->mmap_sem); | |
690 | vma = find_vma_intersection(mm, addr, addr+1); | |
691 | if (!vma) { | |
692 | up_read(&mm->mmap_sem); | |
693 | return -EFAULT; | |
694 | } | |
695 | if (vma->vm_ops && vma->vm_ops->get_policy) | |
696 | pol = vma->vm_ops->get_policy(vma, addr); | |
697 | else | |
698 | pol = vma->vm_policy; | |
699 | } else if (addr) | |
700 | return -EINVAL; | |
701 | ||
702 | if (!pol) | |
703 | pol = &default_policy; | |
704 | ||
705 | if (flags & MPOL_F_NODE) { | |
706 | if (flags & MPOL_F_ADDR) { | |
707 | err = lookup_node(mm, addr); | |
708 | if (err < 0) | |
709 | goto out; | |
8bccd85f | 710 | *policy = err; |
1da177e4 | 711 | } else if (pol == current->mempolicy && |
45c4745a | 712 | pol->mode == MPOL_INTERLEAVE) { |
8bccd85f | 713 | *policy = current->il_next; |
1da177e4 LT |
714 | } else { |
715 | err = -EINVAL; | |
716 | goto out; | |
717 | } | |
718 | } else | |
45c4745a | 719 | *policy = pol->mode | pol->flags; |
1da177e4 LT |
720 | |
721 | if (vma) { | |
722 | up_read(¤t->mm->mmap_sem); | |
723 | vma = NULL; | |
724 | } | |
725 | ||
1da177e4 | 726 | err = 0; |
8bccd85f CL |
727 | if (nmask) |
728 | get_zonemask(pol, nmask); | |
1da177e4 LT |
729 | |
730 | out: | |
52cd3b07 | 731 | mpol_cond_put(pol); |
1da177e4 LT |
732 | if (vma) |
733 | up_read(¤t->mm->mmap_sem); | |
734 | return err; | |
735 | } | |
736 | ||
b20a3503 | 737 | #ifdef CONFIG_MIGRATION |
6ce3c4c0 CL |
738 | /* |
739 | * page migration | |
740 | */ | |
fc301289 CL |
741 | static void migrate_page_add(struct page *page, struct list_head *pagelist, |
742 | unsigned long flags) | |
6ce3c4c0 CL |
743 | { |
744 | /* | |
fc301289 | 745 | * Avoid migrating a page that is shared with others. |
6ce3c4c0 | 746 | */ |
b20a3503 CL |
747 | if ((flags & MPOL_MF_MOVE_ALL) || page_mapcount(page) == 1) |
748 | isolate_lru_page(page, pagelist); | |
7e2ab150 | 749 | } |
6ce3c4c0 | 750 | |
742755a1 | 751 | static struct page *new_node_page(struct page *page, unsigned long node, int **x) |
95a402c3 | 752 | { |
769848c0 | 753 | return alloc_pages_node(node, GFP_HIGHUSER_MOVABLE, 0); |
95a402c3 CL |
754 | } |
755 | ||
7e2ab150 CL |
756 | /* |
757 | * Migrate pages from one node to a target node. | |
758 | * Returns error or the number of pages not migrated. | |
759 | */ | |
dbcb0f19 AB |
760 | static int migrate_to_node(struct mm_struct *mm, int source, int dest, |
761 | int flags) | |
7e2ab150 CL |
762 | { |
763 | nodemask_t nmask; | |
764 | LIST_HEAD(pagelist); | |
765 | int err = 0; | |
766 | ||
767 | nodes_clear(nmask); | |
768 | node_set(source, nmask); | |
6ce3c4c0 | 769 | |
7e2ab150 CL |
770 | check_range(mm, mm->mmap->vm_start, TASK_SIZE, &nmask, |
771 | flags | MPOL_MF_DISCONTIG_OK, &pagelist); | |
772 | ||
aaa994b3 | 773 | if (!list_empty(&pagelist)) |
95a402c3 CL |
774 | err = migrate_pages(&pagelist, new_node_page, dest); |
775 | ||
7e2ab150 | 776 | return err; |
6ce3c4c0 CL |
777 | } |
778 | ||
39743889 | 779 | /* |
7e2ab150 CL |
780 | * Move pages between the two nodesets so as to preserve the physical |
781 | * layout as much as possible. | |
39743889 CL |
782 | * |
783 | * Returns the number of page that could not be moved. | |
784 | */ | |
785 | int do_migrate_pages(struct mm_struct *mm, | |
786 | const nodemask_t *from_nodes, const nodemask_t *to_nodes, int flags) | |
787 | { | |
788 | LIST_HEAD(pagelist); | |
7e2ab150 CL |
789 | int busy = 0; |
790 | int err = 0; | |
791 | nodemask_t tmp; | |
39743889 | 792 | |
7e2ab150 | 793 | down_read(&mm->mmap_sem); |
39743889 | 794 | |
7b2259b3 CL |
795 | err = migrate_vmas(mm, from_nodes, to_nodes, flags); |
796 | if (err) | |
797 | goto out; | |
798 | ||
7e2ab150 CL |
799 | /* |
800 | * Find a 'source' bit set in 'tmp' whose corresponding 'dest' | |
801 | * bit in 'to' is not also set in 'tmp'. Clear the found 'source' | |
802 | * bit in 'tmp', and return that <source, dest> pair for migration. | |
803 | * The pair of nodemasks 'to' and 'from' define the map. | |
804 | * | |
805 | * If no pair of bits is found that way, fallback to picking some | |
806 | * pair of 'source' and 'dest' bits that are not the same. If the | |
807 | * 'source' and 'dest' bits are the same, this represents a node | |
808 | * that will be migrating to itself, so no pages need move. | |
809 | * | |
810 | * If no bits are left in 'tmp', or if all remaining bits left | |
811 | * in 'tmp' correspond to the same bit in 'to', return false | |
812 | * (nothing left to migrate). | |
813 | * | |
814 | * This lets us pick a pair of nodes to migrate between, such that | |
815 | * if possible the dest node is not already occupied by some other | |
816 | * source node, minimizing the risk of overloading the memory on a | |
817 | * node that would happen if we migrated incoming memory to a node | |
818 | * before migrating outgoing memory source that same node. | |
819 | * | |
820 | * A single scan of tmp is sufficient. As we go, we remember the | |
821 | * most recent <s, d> pair that moved (s != d). If we find a pair | |
822 | * that not only moved, but what's better, moved to an empty slot | |
823 | * (d is not set in tmp), then we break out then, with that pair. | |
824 | * Otherwise when we finish scannng from_tmp, we at least have the | |
825 | * most recent <s, d> pair that moved. If we get all the way through | |
826 | * the scan of tmp without finding any node that moved, much less | |
827 | * moved to an empty node, then there is nothing left worth migrating. | |
828 | */ | |
d4984711 | 829 | |
7e2ab150 CL |
830 | tmp = *from_nodes; |
831 | while (!nodes_empty(tmp)) { | |
832 | int s,d; | |
833 | int source = -1; | |
834 | int dest = 0; | |
835 | ||
836 | for_each_node_mask(s, tmp) { | |
837 | d = node_remap(s, *from_nodes, *to_nodes); | |
838 | if (s == d) | |
839 | continue; | |
840 | ||
841 | source = s; /* Node moved. Memorize */ | |
842 | dest = d; | |
843 | ||
844 | /* dest not in remaining from nodes? */ | |
845 | if (!node_isset(dest, tmp)) | |
846 | break; | |
847 | } | |
848 | if (source == -1) | |
849 | break; | |
850 | ||
851 | node_clear(source, tmp); | |
852 | err = migrate_to_node(mm, source, dest, flags); | |
853 | if (err > 0) | |
854 | busy += err; | |
855 | if (err < 0) | |
856 | break; | |
39743889 | 857 | } |
7b2259b3 | 858 | out: |
39743889 | 859 | up_read(&mm->mmap_sem); |
7e2ab150 CL |
860 | if (err < 0) |
861 | return err; | |
862 | return busy; | |
b20a3503 CL |
863 | |
864 | } | |
865 | ||
3ad33b24 LS |
866 | /* |
867 | * Allocate a new page for page migration based on vma policy. | |
868 | * Start assuming that page is mapped by vma pointed to by @private. | |
869 | * Search forward from there, if not. N.B., this assumes that the | |
870 | * list of pages handed to migrate_pages()--which is how we get here-- | |
871 | * is in virtual address order. | |
872 | */ | |
742755a1 | 873 | static struct page *new_vma_page(struct page *page, unsigned long private, int **x) |
95a402c3 CL |
874 | { |
875 | struct vm_area_struct *vma = (struct vm_area_struct *)private; | |
3ad33b24 | 876 | unsigned long uninitialized_var(address); |
95a402c3 | 877 | |
3ad33b24 LS |
878 | while (vma) { |
879 | address = page_address_in_vma(page, vma); | |
880 | if (address != -EFAULT) | |
881 | break; | |
882 | vma = vma->vm_next; | |
883 | } | |
884 | ||
885 | /* | |
886 | * if !vma, alloc_page_vma() will use task or system default policy | |
887 | */ | |
888 | return alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma, address); | |
95a402c3 | 889 | } |
b20a3503 CL |
890 | #else |
891 | ||
892 | static void migrate_page_add(struct page *page, struct list_head *pagelist, | |
893 | unsigned long flags) | |
894 | { | |
39743889 CL |
895 | } |
896 | ||
b20a3503 CL |
897 | int do_migrate_pages(struct mm_struct *mm, |
898 | const nodemask_t *from_nodes, const nodemask_t *to_nodes, int flags) | |
899 | { | |
900 | return -ENOSYS; | |
901 | } | |
95a402c3 | 902 | |
69939749 | 903 | static struct page *new_vma_page(struct page *page, unsigned long private, int **x) |
95a402c3 CL |
904 | { |
905 | return NULL; | |
906 | } | |
b20a3503 CL |
907 | #endif |
908 | ||
dbcb0f19 | 909 | static long do_mbind(unsigned long start, unsigned long len, |
028fec41 DR |
910 | unsigned short mode, unsigned short mode_flags, |
911 | nodemask_t *nmask, unsigned long flags) | |
6ce3c4c0 CL |
912 | { |
913 | struct vm_area_struct *vma; | |
914 | struct mm_struct *mm = current->mm; | |
915 | struct mempolicy *new; | |
916 | unsigned long end; | |
917 | int err; | |
918 | LIST_HEAD(pagelist); | |
919 | ||
a3b51e01 DR |
920 | if (flags & ~(unsigned long)(MPOL_MF_STRICT | |
921 | MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) | |
6ce3c4c0 | 922 | return -EINVAL; |
74c00241 | 923 | if ((flags & MPOL_MF_MOVE_ALL) && !capable(CAP_SYS_NICE)) |
6ce3c4c0 CL |
924 | return -EPERM; |
925 | ||
926 | if (start & ~PAGE_MASK) | |
927 | return -EINVAL; | |
928 | ||
929 | if (mode == MPOL_DEFAULT) | |
930 | flags &= ~MPOL_MF_STRICT; | |
931 | ||
932 | len = (len + PAGE_SIZE - 1) & PAGE_MASK; | |
933 | end = start + len; | |
934 | ||
935 | if (end < start) | |
936 | return -EINVAL; | |
937 | if (end == start) | |
938 | return 0; | |
939 | ||
028fec41 | 940 | new = mpol_new(mode, mode_flags, nmask); |
6ce3c4c0 CL |
941 | if (IS_ERR(new)) |
942 | return PTR_ERR(new); | |
943 | ||
944 | /* | |
945 | * If we are using the default policy then operation | |
946 | * on discontinuous address spaces is okay after all | |
947 | */ | |
948 | if (!new) | |
949 | flags |= MPOL_MF_DISCONTIG_OK; | |
950 | ||
028fec41 DR |
951 | pr_debug("mbind %lx-%lx mode:%d flags:%d nodes:%lx\n", |
952 | start, start + len, mode, mode_flags, | |
953 | nmask ? nodes_addr(*nmask)[0] : -1); | |
6ce3c4c0 CL |
954 | |
955 | down_write(&mm->mmap_sem); | |
956 | vma = check_range(mm, start, end, nmask, | |
957 | flags | MPOL_MF_INVERT, &pagelist); | |
958 | ||
959 | err = PTR_ERR(vma); | |
960 | if (!IS_ERR(vma)) { | |
961 | int nr_failed = 0; | |
962 | ||
963 | err = mbind_range(vma, start, end, new); | |
7e2ab150 | 964 | |
6ce3c4c0 | 965 | if (!list_empty(&pagelist)) |
95a402c3 CL |
966 | nr_failed = migrate_pages(&pagelist, new_vma_page, |
967 | (unsigned long)vma); | |
6ce3c4c0 CL |
968 | |
969 | if (!err && nr_failed && (flags & MPOL_MF_STRICT)) | |
970 | err = -EIO; | |
971 | } | |
b20a3503 | 972 | |
6ce3c4c0 | 973 | up_write(&mm->mmap_sem); |
f0be3d32 | 974 | mpol_put(new); |
6ce3c4c0 CL |
975 | return err; |
976 | } | |
977 | ||
8bccd85f CL |
978 | /* |
979 | * User space interface with variable sized bitmaps for nodelists. | |
980 | */ | |
981 | ||
982 | /* Copy a node mask from user space. */ | |
39743889 | 983 | static int get_nodes(nodemask_t *nodes, const unsigned long __user *nmask, |
8bccd85f CL |
984 | unsigned long maxnode) |
985 | { | |
986 | unsigned long k; | |
987 | unsigned long nlongs; | |
988 | unsigned long endmask; | |
989 | ||
990 | --maxnode; | |
991 | nodes_clear(*nodes); | |
992 | if (maxnode == 0 || !nmask) | |
993 | return 0; | |
a9c930ba | 994 | if (maxnode > PAGE_SIZE*BITS_PER_BYTE) |
636f13c1 | 995 | return -EINVAL; |
8bccd85f CL |
996 | |
997 | nlongs = BITS_TO_LONGS(maxnode); | |
998 | if ((maxnode % BITS_PER_LONG) == 0) | |
999 | endmask = ~0UL; | |
1000 | else | |
1001 | endmask = (1UL << (maxnode % BITS_PER_LONG)) - 1; | |
1002 | ||
1003 | /* When the user specified more nodes than supported just check | |
1004 | if the non supported part is all zero. */ | |
1005 | if (nlongs > BITS_TO_LONGS(MAX_NUMNODES)) { | |
1006 | if (nlongs > PAGE_SIZE/sizeof(long)) | |
1007 | return -EINVAL; | |
1008 | for (k = BITS_TO_LONGS(MAX_NUMNODES); k < nlongs; k++) { | |
1009 | unsigned long t; | |
1010 | if (get_user(t, nmask + k)) | |
1011 | return -EFAULT; | |
1012 | if (k == nlongs - 1) { | |
1013 | if (t & endmask) | |
1014 | return -EINVAL; | |
1015 | } else if (t) | |
1016 | return -EINVAL; | |
1017 | } | |
1018 | nlongs = BITS_TO_LONGS(MAX_NUMNODES); | |
1019 | endmask = ~0UL; | |
1020 | } | |
1021 | ||
1022 | if (copy_from_user(nodes_addr(*nodes), nmask, nlongs*sizeof(unsigned long))) | |
1023 | return -EFAULT; | |
1024 | nodes_addr(*nodes)[nlongs-1] &= endmask; | |
1025 | return 0; | |
1026 | } | |
1027 | ||
1028 | /* Copy a kernel node mask to user space */ | |
1029 | static int copy_nodes_to_user(unsigned long __user *mask, unsigned long maxnode, | |
1030 | nodemask_t *nodes) | |
1031 | { | |
1032 | unsigned long copy = ALIGN(maxnode-1, 64) / 8; | |
1033 | const int nbytes = BITS_TO_LONGS(MAX_NUMNODES) * sizeof(long); | |
1034 | ||
1035 | if (copy > nbytes) { | |
1036 | if (copy > PAGE_SIZE) | |
1037 | return -EINVAL; | |
1038 | if (clear_user((char __user *)mask + nbytes, copy - nbytes)) | |
1039 | return -EFAULT; | |
1040 | copy = nbytes; | |
1041 | } | |
1042 | return copy_to_user(mask, nodes_addr(*nodes), copy) ? -EFAULT : 0; | |
1043 | } | |
1044 | ||
1045 | asmlinkage long sys_mbind(unsigned long start, unsigned long len, | |
1046 | unsigned long mode, | |
1047 | unsigned long __user *nmask, unsigned long maxnode, | |
1048 | unsigned flags) | |
1049 | { | |
1050 | nodemask_t nodes; | |
1051 | int err; | |
028fec41 | 1052 | unsigned short mode_flags; |
8bccd85f | 1053 | |
028fec41 DR |
1054 | mode_flags = mode & MPOL_MODE_FLAGS; |
1055 | mode &= ~MPOL_MODE_FLAGS; | |
a3b51e01 DR |
1056 | if (mode >= MPOL_MAX) |
1057 | return -EINVAL; | |
4c50bc01 DR |
1058 | if ((mode_flags & MPOL_F_STATIC_NODES) && |
1059 | (mode_flags & MPOL_F_RELATIVE_NODES)) | |
1060 | return -EINVAL; | |
8bccd85f CL |
1061 | err = get_nodes(&nodes, nmask, maxnode); |
1062 | if (err) | |
1063 | return err; | |
028fec41 | 1064 | return do_mbind(start, len, mode, mode_flags, &nodes, flags); |
8bccd85f CL |
1065 | } |
1066 | ||
1067 | /* Set the process memory policy */ | |
1068 | asmlinkage long sys_set_mempolicy(int mode, unsigned long __user *nmask, | |
1069 | unsigned long maxnode) | |
1070 | { | |
1071 | int err; | |
1072 | nodemask_t nodes; | |
028fec41 | 1073 | unsigned short flags; |
8bccd85f | 1074 | |
028fec41 DR |
1075 | flags = mode & MPOL_MODE_FLAGS; |
1076 | mode &= ~MPOL_MODE_FLAGS; | |
1077 | if ((unsigned int)mode >= MPOL_MAX) | |
8bccd85f | 1078 | return -EINVAL; |
4c50bc01 DR |
1079 | if ((flags & MPOL_F_STATIC_NODES) && (flags & MPOL_F_RELATIVE_NODES)) |
1080 | return -EINVAL; | |
8bccd85f CL |
1081 | err = get_nodes(&nodes, nmask, maxnode); |
1082 | if (err) | |
1083 | return err; | |
028fec41 | 1084 | return do_set_mempolicy(mode, flags, &nodes); |
8bccd85f CL |
1085 | } |
1086 | ||
39743889 CL |
1087 | asmlinkage long sys_migrate_pages(pid_t pid, unsigned long maxnode, |
1088 | const unsigned long __user *old_nodes, | |
1089 | const unsigned long __user *new_nodes) | |
1090 | { | |
1091 | struct mm_struct *mm; | |
1092 | struct task_struct *task; | |
1093 | nodemask_t old; | |
1094 | nodemask_t new; | |
1095 | nodemask_t task_nodes; | |
1096 | int err; | |
1097 | ||
1098 | err = get_nodes(&old, old_nodes, maxnode); | |
1099 | if (err) | |
1100 | return err; | |
1101 | ||
1102 | err = get_nodes(&new, new_nodes, maxnode); | |
1103 | if (err) | |
1104 | return err; | |
1105 | ||
1106 | /* Find the mm_struct */ | |
1107 | read_lock(&tasklist_lock); | |
228ebcbe | 1108 | task = pid ? find_task_by_vpid(pid) : current; |
39743889 CL |
1109 | if (!task) { |
1110 | read_unlock(&tasklist_lock); | |
1111 | return -ESRCH; | |
1112 | } | |
1113 | mm = get_task_mm(task); | |
1114 | read_unlock(&tasklist_lock); | |
1115 | ||
1116 | if (!mm) | |
1117 | return -EINVAL; | |
1118 | ||
1119 | /* | |
1120 | * Check if this process has the right to modify the specified | |
1121 | * process. The right exists if the process has administrative | |
7f927fcc | 1122 | * capabilities, superuser privileges or the same |
39743889 CL |
1123 | * userid as the target process. |
1124 | */ | |
1125 | if ((current->euid != task->suid) && (current->euid != task->uid) && | |
1126 | (current->uid != task->suid) && (current->uid != task->uid) && | |
74c00241 | 1127 | !capable(CAP_SYS_NICE)) { |
39743889 CL |
1128 | err = -EPERM; |
1129 | goto out; | |
1130 | } | |
1131 | ||
1132 | task_nodes = cpuset_mems_allowed(task); | |
1133 | /* Is the user allowed to access the target nodes? */ | |
74c00241 | 1134 | if (!nodes_subset(new, task_nodes) && !capable(CAP_SYS_NICE)) { |
39743889 CL |
1135 | err = -EPERM; |
1136 | goto out; | |
1137 | } | |
1138 | ||
37b07e41 | 1139 | if (!nodes_subset(new, node_states[N_HIGH_MEMORY])) { |
3b42d28b CL |
1140 | err = -EINVAL; |
1141 | goto out; | |
1142 | } | |
1143 | ||
86c3a764 DQ |
1144 | err = security_task_movememory(task); |
1145 | if (err) | |
1146 | goto out; | |
1147 | ||
511030bc | 1148 | err = do_migrate_pages(mm, &old, &new, |
74c00241 | 1149 | capable(CAP_SYS_NICE) ? MPOL_MF_MOVE_ALL : MPOL_MF_MOVE); |
39743889 CL |
1150 | out: |
1151 | mmput(mm); | |
1152 | return err; | |
1153 | } | |
1154 | ||
1155 | ||
8bccd85f CL |
1156 | /* Retrieve NUMA policy */ |
1157 | asmlinkage long sys_get_mempolicy(int __user *policy, | |
1158 | unsigned long __user *nmask, | |
1159 | unsigned long maxnode, | |
1160 | unsigned long addr, unsigned long flags) | |
1161 | { | |
dbcb0f19 AB |
1162 | int err; |
1163 | int uninitialized_var(pval); | |
8bccd85f CL |
1164 | nodemask_t nodes; |
1165 | ||
1166 | if (nmask != NULL && maxnode < MAX_NUMNODES) | |
1167 | return -EINVAL; | |
1168 | ||
1169 | err = do_get_mempolicy(&pval, &nodes, addr, flags); | |
1170 | ||
1171 | if (err) | |
1172 | return err; | |
1173 | ||
1174 | if (policy && put_user(pval, policy)) | |
1175 | return -EFAULT; | |
1176 | ||
1177 | if (nmask) | |
1178 | err = copy_nodes_to_user(nmask, maxnode, &nodes); | |
1179 | ||
1180 | return err; | |
1181 | } | |
1182 | ||
1da177e4 LT |
1183 | #ifdef CONFIG_COMPAT |
1184 | ||
1185 | asmlinkage long compat_sys_get_mempolicy(int __user *policy, | |
1186 | compat_ulong_t __user *nmask, | |
1187 | compat_ulong_t maxnode, | |
1188 | compat_ulong_t addr, compat_ulong_t flags) | |
1189 | { | |
1190 | long err; | |
1191 | unsigned long __user *nm = NULL; | |
1192 | unsigned long nr_bits, alloc_size; | |
1193 | DECLARE_BITMAP(bm, MAX_NUMNODES); | |
1194 | ||
1195 | nr_bits = min_t(unsigned long, maxnode-1, MAX_NUMNODES); | |
1196 | alloc_size = ALIGN(nr_bits, BITS_PER_LONG) / 8; | |
1197 | ||
1198 | if (nmask) | |
1199 | nm = compat_alloc_user_space(alloc_size); | |
1200 | ||
1201 | err = sys_get_mempolicy(policy, nm, nr_bits+1, addr, flags); | |
1202 | ||
1203 | if (!err && nmask) { | |
1204 | err = copy_from_user(bm, nm, alloc_size); | |
1205 | /* ensure entire bitmap is zeroed */ | |
1206 | err |= clear_user(nmask, ALIGN(maxnode-1, 8) / 8); | |
1207 | err |= compat_put_bitmap(nmask, bm, nr_bits); | |
1208 | } | |
1209 | ||
1210 | return err; | |
1211 | } | |
1212 | ||
1213 | asmlinkage long compat_sys_set_mempolicy(int mode, compat_ulong_t __user *nmask, | |
1214 | compat_ulong_t maxnode) | |
1215 | { | |
1216 | long err = 0; | |
1217 | unsigned long __user *nm = NULL; | |
1218 | unsigned long nr_bits, alloc_size; | |
1219 | DECLARE_BITMAP(bm, MAX_NUMNODES); | |
1220 | ||
1221 | nr_bits = min_t(unsigned long, maxnode-1, MAX_NUMNODES); | |
1222 | alloc_size = ALIGN(nr_bits, BITS_PER_LONG) / 8; | |
1223 | ||
1224 | if (nmask) { | |
1225 | err = compat_get_bitmap(bm, nmask, nr_bits); | |
1226 | nm = compat_alloc_user_space(alloc_size); | |
1227 | err |= copy_to_user(nm, bm, alloc_size); | |
1228 | } | |
1229 | ||
1230 | if (err) | |
1231 | return -EFAULT; | |
1232 | ||
1233 | return sys_set_mempolicy(mode, nm, nr_bits+1); | |
1234 | } | |
1235 | ||
1236 | asmlinkage long compat_sys_mbind(compat_ulong_t start, compat_ulong_t len, | |
1237 | compat_ulong_t mode, compat_ulong_t __user *nmask, | |
1238 | compat_ulong_t maxnode, compat_ulong_t flags) | |
1239 | { | |
1240 | long err = 0; | |
1241 | unsigned long __user *nm = NULL; | |
1242 | unsigned long nr_bits, alloc_size; | |
dfcd3c0d | 1243 | nodemask_t bm; |
1da177e4 LT |
1244 | |
1245 | nr_bits = min_t(unsigned long, maxnode-1, MAX_NUMNODES); | |
1246 | alloc_size = ALIGN(nr_bits, BITS_PER_LONG) / 8; | |
1247 | ||
1248 | if (nmask) { | |
dfcd3c0d | 1249 | err = compat_get_bitmap(nodes_addr(bm), nmask, nr_bits); |
1da177e4 | 1250 | nm = compat_alloc_user_space(alloc_size); |
dfcd3c0d | 1251 | err |= copy_to_user(nm, nodes_addr(bm), alloc_size); |
1da177e4 LT |
1252 | } |
1253 | ||
1254 | if (err) | |
1255 | return -EFAULT; | |
1256 | ||
1257 | return sys_mbind(start, len, mode, nm, nr_bits+1, flags); | |
1258 | } | |
1259 | ||
1260 | #endif | |
1261 | ||
480eccf9 LS |
1262 | /* |
1263 | * get_vma_policy(@task, @vma, @addr) | |
1264 | * @task - task for fallback if vma policy == default | |
1265 | * @vma - virtual memory area whose policy is sought | |
1266 | * @addr - address in @vma for shared policy lookup | |
1267 | * | |
1268 | * Returns effective policy for a VMA at specified address. | |
1269 | * Falls back to @task or system default policy, as necessary. | |
52cd3b07 LS |
1270 | * Current or other task's task mempolicy and non-shared vma policies |
1271 | * are protected by the task's mmap_sem, which must be held for read by | |
1272 | * the caller. | |
1273 | * Shared policies [those marked as MPOL_F_SHARED] require an extra reference | |
1274 | * count--added by the get_policy() vm_op, as appropriate--to protect against | |
1275 | * freeing by another task. It is the caller's responsibility to free the | |
1276 | * extra reference for shared policies. | |
480eccf9 | 1277 | */ |
ae4d8c16 | 1278 | static struct mempolicy *get_vma_policy(struct task_struct *task, |
48fce342 | 1279 | struct vm_area_struct *vma, unsigned long addr) |
1da177e4 | 1280 | { |
6e21c8f1 | 1281 | struct mempolicy *pol = task->mempolicy; |
1da177e4 LT |
1282 | |
1283 | if (vma) { | |
480eccf9 | 1284 | if (vma->vm_ops && vma->vm_ops->get_policy) { |
ae4d8c16 LS |
1285 | struct mempolicy *vpol = vma->vm_ops->get_policy(vma, |
1286 | addr); | |
1287 | if (vpol) | |
1288 | pol = vpol; | |
480eccf9 | 1289 | } else if (vma->vm_policy && |
45c4745a | 1290 | vma->vm_policy->mode != MPOL_DEFAULT) |
1da177e4 LT |
1291 | pol = vma->vm_policy; |
1292 | } | |
1293 | if (!pol) | |
1294 | pol = &default_policy; | |
1295 | return pol; | |
1296 | } | |
1297 | ||
52cd3b07 LS |
1298 | /* |
1299 | * Return a nodemask representing a mempolicy for filtering nodes for | |
1300 | * page allocation | |
1301 | */ | |
1302 | static nodemask_t *policy_nodemask(gfp_t gfp, struct mempolicy *policy) | |
19770b32 MG |
1303 | { |
1304 | /* Lower zones don't get a nodemask applied for MPOL_BIND */ | |
45c4745a | 1305 | if (unlikely(policy->mode == MPOL_BIND) && |
19770b32 MG |
1306 | gfp_zone(gfp) >= policy_zone && |
1307 | cpuset_nodemask_valid_mems_allowed(&policy->v.nodes)) | |
1308 | return &policy->v.nodes; | |
1309 | ||
1310 | return NULL; | |
1311 | } | |
1312 | ||
52cd3b07 LS |
1313 | /* Return a zonelist indicated by gfp for node representing a mempolicy */ |
1314 | static struct zonelist *policy_zonelist(gfp_t gfp, struct mempolicy *policy) | |
1da177e4 LT |
1315 | { |
1316 | int nd; | |
1317 | ||
45c4745a | 1318 | switch (policy->mode) { |
1da177e4 LT |
1319 | case MPOL_PREFERRED: |
1320 | nd = policy->v.preferred_node; | |
1321 | if (nd < 0) | |
1322 | nd = numa_node_id(); | |
1323 | break; | |
1324 | case MPOL_BIND: | |
19770b32 | 1325 | /* |
52cd3b07 LS |
1326 | * Normally, MPOL_BIND allocations are node-local within the |
1327 | * allowed nodemask. However, if __GFP_THISNODE is set and the | |
1328 | * current node is part of the mask, we use the zonelist for | |
1329 | * the first node in the mask instead. | |
19770b32 MG |
1330 | */ |
1331 | nd = numa_node_id(); | |
1332 | if (unlikely(gfp & __GFP_THISNODE) && | |
1333 | unlikely(!node_isset(nd, policy->v.nodes))) | |
1334 | nd = first_node(policy->v.nodes); | |
1335 | break; | |
1da177e4 LT |
1336 | case MPOL_INTERLEAVE: /* should not happen */ |
1337 | case MPOL_DEFAULT: | |
1338 | nd = numa_node_id(); | |
1339 | break; | |
1340 | default: | |
1341 | nd = 0; | |
1342 | BUG(); | |
1343 | } | |
0e88460d | 1344 | return node_zonelist(nd, gfp); |
1da177e4 LT |
1345 | } |
1346 | ||
1347 | /* Do dynamic interleaving for a process */ | |
1348 | static unsigned interleave_nodes(struct mempolicy *policy) | |
1349 | { | |
1350 | unsigned nid, next; | |
1351 | struct task_struct *me = current; | |
1352 | ||
1353 | nid = me->il_next; | |
dfcd3c0d | 1354 | next = next_node(nid, policy->v.nodes); |
1da177e4 | 1355 | if (next >= MAX_NUMNODES) |
dfcd3c0d | 1356 | next = first_node(policy->v.nodes); |
f5b087b5 DR |
1357 | if (next < MAX_NUMNODES) |
1358 | me->il_next = next; | |
1da177e4 LT |
1359 | return nid; |
1360 | } | |
1361 | ||
dc85da15 CL |
1362 | /* |
1363 | * Depending on the memory policy provide a node from which to allocate the | |
1364 | * next slab entry. | |
52cd3b07 LS |
1365 | * @policy must be protected by freeing by the caller. If @policy is |
1366 | * the current task's mempolicy, this protection is implicit, as only the | |
1367 | * task can change it's policy. The system default policy requires no | |
1368 | * such protection. | |
dc85da15 CL |
1369 | */ |
1370 | unsigned slab_node(struct mempolicy *policy) | |
1371 | { | |
45c4745a | 1372 | unsigned short pol = policy ? policy->mode : MPOL_DEFAULT; |
765c4507 CL |
1373 | |
1374 | switch (pol) { | |
dc85da15 CL |
1375 | case MPOL_INTERLEAVE: |
1376 | return interleave_nodes(policy); | |
1377 | ||
dd1a239f | 1378 | case MPOL_BIND: { |
dc85da15 CL |
1379 | /* |
1380 | * Follow bind policy behavior and start allocation at the | |
1381 | * first node. | |
1382 | */ | |
19770b32 MG |
1383 | struct zonelist *zonelist; |
1384 | struct zone *zone; | |
1385 | enum zone_type highest_zoneidx = gfp_zone(GFP_KERNEL); | |
1386 | zonelist = &NODE_DATA(numa_node_id())->node_zonelists[0]; | |
1387 | (void)first_zones_zonelist(zonelist, highest_zoneidx, | |
1388 | &policy->v.nodes, | |
1389 | &zone); | |
1390 | return zone->node; | |
dd1a239f | 1391 | } |
dc85da15 CL |
1392 | |
1393 | case MPOL_PREFERRED: | |
1394 | if (policy->v.preferred_node >= 0) | |
1395 | return policy->v.preferred_node; | |
1396 | /* Fall through */ | |
1397 | ||
1398 | default: | |
1399 | return numa_node_id(); | |
1400 | } | |
1401 | } | |
1402 | ||
1da177e4 LT |
1403 | /* Do static interleaving for a VMA with known offset. */ |
1404 | static unsigned offset_il_node(struct mempolicy *pol, | |
1405 | struct vm_area_struct *vma, unsigned long off) | |
1406 | { | |
dfcd3c0d | 1407 | unsigned nnodes = nodes_weight(pol->v.nodes); |
f5b087b5 | 1408 | unsigned target; |
1da177e4 LT |
1409 | int c; |
1410 | int nid = -1; | |
1411 | ||
f5b087b5 DR |
1412 | if (!nnodes) |
1413 | return numa_node_id(); | |
1414 | target = (unsigned int)off % nnodes; | |
1da177e4 LT |
1415 | c = 0; |
1416 | do { | |
dfcd3c0d | 1417 | nid = next_node(nid, pol->v.nodes); |
1da177e4 LT |
1418 | c++; |
1419 | } while (c <= target); | |
1da177e4 LT |
1420 | return nid; |
1421 | } | |
1422 | ||
5da7ca86 CL |
1423 | /* Determine a node number for interleave */ |
1424 | static inline unsigned interleave_nid(struct mempolicy *pol, | |
1425 | struct vm_area_struct *vma, unsigned long addr, int shift) | |
1426 | { | |
1427 | if (vma) { | |
1428 | unsigned long off; | |
1429 | ||
3b98b087 NA |
1430 | /* |
1431 | * for small pages, there is no difference between | |
1432 | * shift and PAGE_SHIFT, so the bit-shift is safe. | |
1433 | * for huge pages, since vm_pgoff is in units of small | |
1434 | * pages, we need to shift off the always 0 bits to get | |
1435 | * a useful offset. | |
1436 | */ | |
1437 | BUG_ON(shift < PAGE_SHIFT); | |
1438 | off = vma->vm_pgoff >> (shift - PAGE_SHIFT); | |
5da7ca86 CL |
1439 | off += (addr - vma->vm_start) >> shift; |
1440 | return offset_il_node(pol, vma, off); | |
1441 | } else | |
1442 | return interleave_nodes(pol); | |
1443 | } | |
1444 | ||
00ac59ad | 1445 | #ifdef CONFIG_HUGETLBFS |
480eccf9 LS |
1446 | /* |
1447 | * huge_zonelist(@vma, @addr, @gfp_flags, @mpol) | |
1448 | * @vma = virtual memory area whose policy is sought | |
1449 | * @addr = address in @vma for shared policy lookup and interleave policy | |
1450 | * @gfp_flags = for requested zone | |
19770b32 MG |
1451 | * @mpol = pointer to mempolicy pointer for reference counted mempolicy |
1452 | * @nodemask = pointer to nodemask pointer for MPOL_BIND nodemask | |
480eccf9 | 1453 | * |
52cd3b07 LS |
1454 | * Returns a zonelist suitable for a huge page allocation and a pointer |
1455 | * to the struct mempolicy for conditional unref after allocation. | |
1456 | * If the effective policy is 'BIND, returns a pointer to the mempolicy's | |
1457 | * @nodemask for filtering the zonelist. | |
480eccf9 | 1458 | */ |
396faf03 | 1459 | struct zonelist *huge_zonelist(struct vm_area_struct *vma, unsigned long addr, |
19770b32 MG |
1460 | gfp_t gfp_flags, struct mempolicy **mpol, |
1461 | nodemask_t **nodemask) | |
5da7ca86 | 1462 | { |
480eccf9 | 1463 | struct zonelist *zl; |
5da7ca86 | 1464 | |
52cd3b07 | 1465 | *mpol = get_vma_policy(current, vma, addr); |
19770b32 | 1466 | *nodemask = NULL; /* assume !MPOL_BIND */ |
5da7ca86 | 1467 | |
52cd3b07 LS |
1468 | if (unlikely((*mpol)->mode == MPOL_INTERLEAVE)) { |
1469 | zl = node_zonelist(interleave_nid(*mpol, vma, addr, | |
1470 | HPAGE_SHIFT), gfp_flags); | |
1471 | } else { | |
1472 | zl = policy_zonelist(gfp_flags, *mpol); | |
1473 | if ((*mpol)->mode == MPOL_BIND) | |
1474 | *nodemask = &(*mpol)->v.nodes; | |
480eccf9 LS |
1475 | } |
1476 | return zl; | |
5da7ca86 | 1477 | } |
00ac59ad | 1478 | #endif |
5da7ca86 | 1479 | |
1da177e4 LT |
1480 | /* Allocate a page in interleaved policy. |
1481 | Own path because it needs to do special accounting. */ | |
662f3a0b AK |
1482 | static struct page *alloc_page_interleave(gfp_t gfp, unsigned order, |
1483 | unsigned nid) | |
1da177e4 LT |
1484 | { |
1485 | struct zonelist *zl; | |
1486 | struct page *page; | |
1487 | ||
0e88460d | 1488 | zl = node_zonelist(nid, gfp); |
1da177e4 | 1489 | page = __alloc_pages(gfp, order, zl); |
dd1a239f | 1490 | if (page && page_zone(page) == zonelist_zone(&zl->_zonerefs[0])) |
ca889e6c | 1491 | inc_zone_page_state(page, NUMA_INTERLEAVE_HIT); |
1da177e4 LT |
1492 | return page; |
1493 | } | |
1494 | ||
1495 | /** | |
1496 | * alloc_page_vma - Allocate a page for a VMA. | |
1497 | * | |
1498 | * @gfp: | |
1499 | * %GFP_USER user allocation. | |
1500 | * %GFP_KERNEL kernel allocations, | |
1501 | * %GFP_HIGHMEM highmem/user allocations, | |
1502 | * %GFP_FS allocation should not call back into a file system. | |
1503 | * %GFP_ATOMIC don't sleep. | |
1504 | * | |
1505 | * @vma: Pointer to VMA or NULL if not available. | |
1506 | * @addr: Virtual Address of the allocation. Must be inside the VMA. | |
1507 | * | |
1508 | * This function allocates a page from the kernel page pool and applies | |
1509 | * a NUMA policy associated with the VMA or the current process. | |
1510 | * When VMA is not NULL caller must hold down_read on the mmap_sem of the | |
1511 | * mm_struct of the VMA to prevent it from going away. Should be used for | |
1512 | * all allocations for pages that will be mapped into | |
1513 | * user space. Returns NULL when no page can be allocated. | |
1514 | * | |
1515 | * Should be called with the mm_sem of the vma hold. | |
1516 | */ | |
1517 | struct page * | |
dd0fc66f | 1518 | alloc_page_vma(gfp_t gfp, struct vm_area_struct *vma, unsigned long addr) |
1da177e4 | 1519 | { |
6e21c8f1 | 1520 | struct mempolicy *pol = get_vma_policy(current, vma, addr); |
480eccf9 | 1521 | struct zonelist *zl; |
1da177e4 | 1522 | |
cf2a473c | 1523 | cpuset_update_task_memory_state(); |
1da177e4 | 1524 | |
45c4745a | 1525 | if (unlikely(pol->mode == MPOL_INTERLEAVE)) { |
1da177e4 | 1526 | unsigned nid; |
5da7ca86 CL |
1527 | |
1528 | nid = interleave_nid(pol, vma, addr, PAGE_SHIFT); | |
52cd3b07 | 1529 | mpol_cond_put(pol); |
1da177e4 LT |
1530 | return alloc_page_interleave(gfp, 0, nid); |
1531 | } | |
52cd3b07 LS |
1532 | zl = policy_zonelist(gfp, pol); |
1533 | if (unlikely(mpol_needs_cond_ref(pol))) { | |
480eccf9 | 1534 | /* |
52cd3b07 | 1535 | * slow path: ref counted shared policy |
480eccf9 | 1536 | */ |
19770b32 | 1537 | struct page *page = __alloc_pages_nodemask(gfp, 0, |
52cd3b07 | 1538 | zl, policy_nodemask(gfp, pol)); |
f0be3d32 | 1539 | __mpol_put(pol); |
480eccf9 LS |
1540 | return page; |
1541 | } | |
1542 | /* | |
1543 | * fast path: default or task policy | |
1544 | */ | |
52cd3b07 | 1545 | return __alloc_pages_nodemask(gfp, 0, zl, policy_nodemask(gfp, pol)); |
1da177e4 LT |
1546 | } |
1547 | ||
1548 | /** | |
1549 | * alloc_pages_current - Allocate pages. | |
1550 | * | |
1551 | * @gfp: | |
1552 | * %GFP_USER user allocation, | |
1553 | * %GFP_KERNEL kernel allocation, | |
1554 | * %GFP_HIGHMEM highmem allocation, | |
1555 | * %GFP_FS don't call back into a file system. | |
1556 | * %GFP_ATOMIC don't sleep. | |
1557 | * @order: Power of two of allocation size in pages. 0 is a single page. | |
1558 | * | |
1559 | * Allocate a page from the kernel page pool. When not in | |
1560 | * interrupt context and apply the current process NUMA policy. | |
1561 | * Returns NULL when no page can be allocated. | |
1562 | * | |
cf2a473c | 1563 | * Don't call cpuset_update_task_memory_state() unless |
1da177e4 LT |
1564 | * 1) it's ok to take cpuset_sem (can WAIT), and |
1565 | * 2) allocating for current task (not interrupt). | |
1566 | */ | |
dd0fc66f | 1567 | struct page *alloc_pages_current(gfp_t gfp, unsigned order) |
1da177e4 LT |
1568 | { |
1569 | struct mempolicy *pol = current->mempolicy; | |
1570 | ||
1571 | if ((gfp & __GFP_WAIT) && !in_interrupt()) | |
cf2a473c | 1572 | cpuset_update_task_memory_state(); |
9b819d20 | 1573 | if (!pol || in_interrupt() || (gfp & __GFP_THISNODE)) |
1da177e4 | 1574 | pol = &default_policy; |
52cd3b07 LS |
1575 | |
1576 | /* | |
1577 | * No reference counting needed for current->mempolicy | |
1578 | * nor system default_policy | |
1579 | */ | |
45c4745a | 1580 | if (pol->mode == MPOL_INTERLEAVE) |
1da177e4 | 1581 | return alloc_page_interleave(gfp, order, interleave_nodes(pol)); |
19770b32 | 1582 | return __alloc_pages_nodemask(gfp, order, |
52cd3b07 | 1583 | policy_zonelist(gfp, pol), policy_nodemask(gfp, pol)); |
1da177e4 LT |
1584 | } |
1585 | EXPORT_SYMBOL(alloc_pages_current); | |
1586 | ||
4225399a | 1587 | /* |
846a16bf | 1588 | * If mpol_dup() sees current->cpuset == cpuset_being_rebound, then it |
4225399a PJ |
1589 | * rebinds the mempolicy its copying by calling mpol_rebind_policy() |
1590 | * with the mems_allowed returned by cpuset_mems_allowed(). This | |
1591 | * keeps mempolicies cpuset relative after its cpuset moves. See | |
1592 | * further kernel/cpuset.c update_nodemask(). | |
1593 | */ | |
4225399a | 1594 | |
846a16bf LS |
1595 | /* Slow path of a mempolicy duplicate */ |
1596 | struct mempolicy *__mpol_dup(struct mempolicy *old) | |
1da177e4 LT |
1597 | { |
1598 | struct mempolicy *new = kmem_cache_alloc(policy_cache, GFP_KERNEL); | |
1599 | ||
1600 | if (!new) | |
1601 | return ERR_PTR(-ENOMEM); | |
4225399a PJ |
1602 | if (current_cpuset_is_being_rebound()) { |
1603 | nodemask_t mems = cpuset_mems_allowed(current); | |
1604 | mpol_rebind_policy(old, &mems); | |
1605 | } | |
1da177e4 LT |
1606 | *new = *old; |
1607 | atomic_set(&new->refcnt, 1); | |
1da177e4 LT |
1608 | return new; |
1609 | } | |
1610 | ||
52cd3b07 LS |
1611 | /* |
1612 | * If *frompol needs [has] an extra ref, copy *frompol to *tompol , | |
1613 | * eliminate the * MPOL_F_* flags that require conditional ref and | |
1614 | * [NOTE!!!] drop the extra ref. Not safe to reference *frompol directly | |
1615 | * after return. Use the returned value. | |
1616 | * | |
1617 | * Allows use of a mempolicy for, e.g., multiple allocations with a single | |
1618 | * policy lookup, even if the policy needs/has extra ref on lookup. | |
1619 | * shmem_readahead needs this. | |
1620 | */ | |
1621 | struct mempolicy *__mpol_cond_copy(struct mempolicy *tompol, | |
1622 | struct mempolicy *frompol) | |
1623 | { | |
1624 | if (!mpol_needs_cond_ref(frompol)) | |
1625 | return frompol; | |
1626 | ||
1627 | *tompol = *frompol; | |
1628 | tompol->flags &= ~MPOL_F_SHARED; /* copy doesn't need unref */ | |
1629 | __mpol_put(frompol); | |
1630 | return tompol; | |
1631 | } | |
1632 | ||
f5b087b5 DR |
1633 | static int mpol_match_intent(const struct mempolicy *a, |
1634 | const struct mempolicy *b) | |
1635 | { | |
1636 | if (a->flags != b->flags) | |
1637 | return 0; | |
1638 | if (!mpol_store_user_nodemask(a)) | |
1639 | return 1; | |
1640 | return nodes_equal(a->w.user_nodemask, b->w.user_nodemask); | |
1641 | } | |
1642 | ||
1da177e4 LT |
1643 | /* Slow path of a mempolicy comparison */ |
1644 | int __mpol_equal(struct mempolicy *a, struct mempolicy *b) | |
1645 | { | |
1646 | if (!a || !b) | |
1647 | return 0; | |
45c4745a | 1648 | if (a->mode != b->mode) |
1da177e4 | 1649 | return 0; |
45c4745a | 1650 | if (a->mode != MPOL_DEFAULT && !mpol_match_intent(a, b)) |
f5b087b5 | 1651 | return 0; |
45c4745a | 1652 | switch (a->mode) { |
1da177e4 LT |
1653 | case MPOL_DEFAULT: |
1654 | return 1; | |
19770b32 MG |
1655 | case MPOL_BIND: |
1656 | /* Fall through */ | |
1da177e4 | 1657 | case MPOL_INTERLEAVE: |
dfcd3c0d | 1658 | return nodes_equal(a->v.nodes, b->v.nodes); |
1da177e4 LT |
1659 | case MPOL_PREFERRED: |
1660 | return a->v.preferred_node == b->v.preferred_node; | |
1da177e4 LT |
1661 | default: |
1662 | BUG(); | |
1663 | return 0; | |
1664 | } | |
1665 | } | |
1666 | ||
1da177e4 LT |
1667 | /* |
1668 | * Shared memory backing store policy support. | |
1669 | * | |
1670 | * Remember policies even when nobody has shared memory mapped. | |
1671 | * The policies are kept in Red-Black tree linked from the inode. | |
1672 | * They are protected by the sp->lock spinlock, which should be held | |
1673 | * for any accesses to the tree. | |
1674 | */ | |
1675 | ||
1676 | /* lookup first element intersecting start-end */ | |
1677 | /* Caller holds sp->lock */ | |
1678 | static struct sp_node * | |
1679 | sp_lookup(struct shared_policy *sp, unsigned long start, unsigned long end) | |
1680 | { | |
1681 | struct rb_node *n = sp->root.rb_node; | |
1682 | ||
1683 | while (n) { | |
1684 | struct sp_node *p = rb_entry(n, struct sp_node, nd); | |
1685 | ||
1686 | if (start >= p->end) | |
1687 | n = n->rb_right; | |
1688 | else if (end <= p->start) | |
1689 | n = n->rb_left; | |
1690 | else | |
1691 | break; | |
1692 | } | |
1693 | if (!n) | |
1694 | return NULL; | |
1695 | for (;;) { | |
1696 | struct sp_node *w = NULL; | |
1697 | struct rb_node *prev = rb_prev(n); | |
1698 | if (!prev) | |
1699 | break; | |
1700 | w = rb_entry(prev, struct sp_node, nd); | |
1701 | if (w->end <= start) | |
1702 | break; | |
1703 | n = prev; | |
1704 | } | |
1705 | return rb_entry(n, struct sp_node, nd); | |
1706 | } | |
1707 | ||
1708 | /* Insert a new shared policy into the list. */ | |
1709 | /* Caller holds sp->lock */ | |
1710 | static void sp_insert(struct shared_policy *sp, struct sp_node *new) | |
1711 | { | |
1712 | struct rb_node **p = &sp->root.rb_node; | |
1713 | struct rb_node *parent = NULL; | |
1714 | struct sp_node *nd; | |
1715 | ||
1716 | while (*p) { | |
1717 | parent = *p; | |
1718 | nd = rb_entry(parent, struct sp_node, nd); | |
1719 | if (new->start < nd->start) | |
1720 | p = &(*p)->rb_left; | |
1721 | else if (new->end > nd->end) | |
1722 | p = &(*p)->rb_right; | |
1723 | else | |
1724 | BUG(); | |
1725 | } | |
1726 | rb_link_node(&new->nd, parent, p); | |
1727 | rb_insert_color(&new->nd, &sp->root); | |
140d5a49 | 1728 | pr_debug("inserting %lx-%lx: %d\n", new->start, new->end, |
45c4745a | 1729 | new->policy ? new->policy->mode : 0); |
1da177e4 LT |
1730 | } |
1731 | ||
1732 | /* Find shared policy intersecting idx */ | |
1733 | struct mempolicy * | |
1734 | mpol_shared_policy_lookup(struct shared_policy *sp, unsigned long idx) | |
1735 | { | |
1736 | struct mempolicy *pol = NULL; | |
1737 | struct sp_node *sn; | |
1738 | ||
1739 | if (!sp->root.rb_node) | |
1740 | return NULL; | |
1741 | spin_lock(&sp->lock); | |
1742 | sn = sp_lookup(sp, idx, idx+1); | |
1743 | if (sn) { | |
1744 | mpol_get(sn->policy); | |
1745 | pol = sn->policy; | |
1746 | } | |
1747 | spin_unlock(&sp->lock); | |
1748 | return pol; | |
1749 | } | |
1750 | ||
1751 | static void sp_delete(struct shared_policy *sp, struct sp_node *n) | |
1752 | { | |
140d5a49 | 1753 | pr_debug("deleting %lx-l%lx\n", n->start, n->end); |
1da177e4 | 1754 | rb_erase(&n->nd, &sp->root); |
f0be3d32 | 1755 | mpol_put(n->policy); |
1da177e4 LT |
1756 | kmem_cache_free(sn_cache, n); |
1757 | } | |
1758 | ||
dbcb0f19 AB |
1759 | static struct sp_node *sp_alloc(unsigned long start, unsigned long end, |
1760 | struct mempolicy *pol) | |
1da177e4 LT |
1761 | { |
1762 | struct sp_node *n = kmem_cache_alloc(sn_cache, GFP_KERNEL); | |
1763 | ||
1764 | if (!n) | |
1765 | return NULL; | |
1766 | n->start = start; | |
1767 | n->end = end; | |
1768 | mpol_get(pol); | |
aab0b102 | 1769 | pol->flags |= MPOL_F_SHARED; /* for unref */ |
1da177e4 LT |
1770 | n->policy = pol; |
1771 | return n; | |
1772 | } | |
1773 | ||
1774 | /* Replace a policy range. */ | |
1775 | static int shared_policy_replace(struct shared_policy *sp, unsigned long start, | |
1776 | unsigned long end, struct sp_node *new) | |
1777 | { | |
1778 | struct sp_node *n, *new2 = NULL; | |
1779 | ||
1780 | restart: | |
1781 | spin_lock(&sp->lock); | |
1782 | n = sp_lookup(sp, start, end); | |
1783 | /* Take care of old policies in the same range. */ | |
1784 | while (n && n->start < end) { | |
1785 | struct rb_node *next = rb_next(&n->nd); | |
1786 | if (n->start >= start) { | |
1787 | if (n->end <= end) | |
1788 | sp_delete(sp, n); | |
1789 | else | |
1790 | n->start = end; | |
1791 | } else { | |
1792 | /* Old policy spanning whole new range. */ | |
1793 | if (n->end > end) { | |
1794 | if (!new2) { | |
1795 | spin_unlock(&sp->lock); | |
1796 | new2 = sp_alloc(end, n->end, n->policy); | |
1797 | if (!new2) | |
1798 | return -ENOMEM; | |
1799 | goto restart; | |
1800 | } | |
1801 | n->end = start; | |
1802 | sp_insert(sp, new2); | |
1803 | new2 = NULL; | |
1804 | break; | |
1805 | } else | |
1806 | n->end = start; | |
1807 | } | |
1808 | if (!next) | |
1809 | break; | |
1810 | n = rb_entry(next, struct sp_node, nd); | |
1811 | } | |
1812 | if (new) | |
1813 | sp_insert(sp, new); | |
1814 | spin_unlock(&sp->lock); | |
1815 | if (new2) { | |
f0be3d32 | 1816 | mpol_put(new2->policy); |
1da177e4 LT |
1817 | kmem_cache_free(sn_cache, new2); |
1818 | } | |
1819 | return 0; | |
1820 | } | |
1821 | ||
a3b51e01 | 1822 | void mpol_shared_policy_init(struct shared_policy *info, unsigned short policy, |
028fec41 | 1823 | unsigned short flags, nodemask_t *policy_nodes) |
7339ff83 RH |
1824 | { |
1825 | info->root = RB_ROOT; | |
1826 | spin_lock_init(&info->lock); | |
1827 | ||
1828 | if (policy != MPOL_DEFAULT) { | |
1829 | struct mempolicy *newpol; | |
1830 | ||
1831 | /* Falls back to MPOL_DEFAULT on any error */ | |
028fec41 | 1832 | newpol = mpol_new(policy, flags, policy_nodes); |
7339ff83 RH |
1833 | if (!IS_ERR(newpol)) { |
1834 | /* Create pseudo-vma that contains just the policy */ | |
1835 | struct vm_area_struct pvma; | |
1836 | ||
1837 | memset(&pvma, 0, sizeof(struct vm_area_struct)); | |
1838 | /* Policy covers entire file */ | |
1839 | pvma.vm_end = TASK_SIZE; | |
1840 | mpol_set_shared_policy(info, &pvma, newpol); | |
f0be3d32 | 1841 | mpol_put(newpol); |
7339ff83 RH |
1842 | } |
1843 | } | |
1844 | } | |
1845 | ||
1da177e4 LT |
1846 | int mpol_set_shared_policy(struct shared_policy *info, |
1847 | struct vm_area_struct *vma, struct mempolicy *npol) | |
1848 | { | |
1849 | int err; | |
1850 | struct sp_node *new = NULL; | |
1851 | unsigned long sz = vma_pages(vma); | |
1852 | ||
028fec41 | 1853 | pr_debug("set_shared_policy %lx sz %lu %d %d %lx\n", |
1da177e4 | 1854 | vma->vm_pgoff, |
45c4745a | 1855 | sz, npol ? npol->mode : -1, |
028fec41 | 1856 | npol ? npol->flags : -1, |
140d5a49 | 1857 | npol ? nodes_addr(npol->v.nodes)[0] : -1); |
1da177e4 LT |
1858 | |
1859 | if (npol) { | |
1860 | new = sp_alloc(vma->vm_pgoff, vma->vm_pgoff + sz, npol); | |
1861 | if (!new) | |
1862 | return -ENOMEM; | |
1863 | } | |
1864 | err = shared_policy_replace(info, vma->vm_pgoff, vma->vm_pgoff+sz, new); | |
1865 | if (err && new) | |
1866 | kmem_cache_free(sn_cache, new); | |
1867 | return err; | |
1868 | } | |
1869 | ||
1870 | /* Free a backing policy store on inode delete. */ | |
1871 | void mpol_free_shared_policy(struct shared_policy *p) | |
1872 | { | |
1873 | struct sp_node *n; | |
1874 | struct rb_node *next; | |
1875 | ||
1876 | if (!p->root.rb_node) | |
1877 | return; | |
1878 | spin_lock(&p->lock); | |
1879 | next = rb_first(&p->root); | |
1880 | while (next) { | |
1881 | n = rb_entry(next, struct sp_node, nd); | |
1882 | next = rb_next(&n->nd); | |
90c5029e | 1883 | rb_erase(&n->nd, &p->root); |
f0be3d32 | 1884 | mpol_put(n->policy); |
1da177e4 LT |
1885 | kmem_cache_free(sn_cache, n); |
1886 | } | |
1887 | spin_unlock(&p->lock); | |
1da177e4 LT |
1888 | } |
1889 | ||
1890 | /* assumes fs == KERNEL_DS */ | |
1891 | void __init numa_policy_init(void) | |
1892 | { | |
b71636e2 PM |
1893 | nodemask_t interleave_nodes; |
1894 | unsigned long largest = 0; | |
1895 | int nid, prefer = 0; | |
1896 | ||
1da177e4 LT |
1897 | policy_cache = kmem_cache_create("numa_policy", |
1898 | sizeof(struct mempolicy), | |
20c2df83 | 1899 | 0, SLAB_PANIC, NULL); |
1da177e4 LT |
1900 | |
1901 | sn_cache = kmem_cache_create("shared_policy_node", | |
1902 | sizeof(struct sp_node), | |
20c2df83 | 1903 | 0, SLAB_PANIC, NULL); |
1da177e4 | 1904 | |
b71636e2 PM |
1905 | /* |
1906 | * Set interleaving policy for system init. Interleaving is only | |
1907 | * enabled across suitably sized nodes (default is >= 16MB), or | |
1908 | * fall back to the largest node if they're all smaller. | |
1909 | */ | |
1910 | nodes_clear(interleave_nodes); | |
56bbd65d | 1911 | for_each_node_state(nid, N_HIGH_MEMORY) { |
b71636e2 PM |
1912 | unsigned long total_pages = node_present_pages(nid); |
1913 | ||
1914 | /* Preserve the largest node */ | |
1915 | if (largest < total_pages) { | |
1916 | largest = total_pages; | |
1917 | prefer = nid; | |
1918 | } | |
1919 | ||
1920 | /* Interleave this node? */ | |
1921 | if ((total_pages << PAGE_SHIFT) >= (16 << 20)) | |
1922 | node_set(nid, interleave_nodes); | |
1923 | } | |
1924 | ||
1925 | /* All too small, use the largest */ | |
1926 | if (unlikely(nodes_empty(interleave_nodes))) | |
1927 | node_set(prefer, interleave_nodes); | |
1da177e4 | 1928 | |
028fec41 | 1929 | if (do_set_mempolicy(MPOL_INTERLEAVE, 0, &interleave_nodes)) |
1da177e4 LT |
1930 | printk("numa_policy_init: interleaving failed\n"); |
1931 | } | |
1932 | ||
8bccd85f | 1933 | /* Reset policy of current process to default */ |
1da177e4 LT |
1934 | void numa_default_policy(void) |
1935 | { | |
028fec41 | 1936 | do_set_mempolicy(MPOL_DEFAULT, 0, NULL); |
1da177e4 | 1937 | } |
68860ec1 | 1938 | |
1a75a6c8 CL |
1939 | /* |
1940 | * Display pages allocated per node and memory policy via /proc. | |
1941 | */ | |
15ad7cdc HD |
1942 | static const char * const policy_types[] = |
1943 | { "default", "prefer", "bind", "interleave" }; | |
1a75a6c8 CL |
1944 | |
1945 | /* | |
1946 | * Convert a mempolicy into a string. | |
1947 | * Returns the number of characters in buffer (if positive) | |
1948 | * or an error (negative) | |
1949 | */ | |
1950 | static inline int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol) | |
1951 | { | |
1952 | char *p = buffer; | |
1953 | int l; | |
1954 | nodemask_t nodes; | |
45c4745a | 1955 | unsigned short mode = pol ? pol->mode : MPOL_DEFAULT; |
f5b087b5 | 1956 | unsigned short flags = pol ? pol->flags : 0; |
1a75a6c8 CL |
1957 | |
1958 | switch (mode) { | |
1959 | case MPOL_DEFAULT: | |
1960 | nodes_clear(nodes); | |
1961 | break; | |
1962 | ||
1963 | case MPOL_PREFERRED: | |
1964 | nodes_clear(nodes); | |
1965 | node_set(pol->v.preferred_node, nodes); | |
1966 | break; | |
1967 | ||
1968 | case MPOL_BIND: | |
19770b32 | 1969 | /* Fall through */ |
1a75a6c8 CL |
1970 | case MPOL_INTERLEAVE: |
1971 | nodes = pol->v.nodes; | |
1972 | break; | |
1973 | ||
1974 | default: | |
1975 | BUG(); | |
1976 | return -EFAULT; | |
1977 | } | |
1978 | ||
1979 | l = strlen(policy_types[mode]); | |
1980 | if (buffer + maxlen < p + l + 1) | |
1981 | return -ENOSPC; | |
1982 | ||
1983 | strcpy(p, policy_types[mode]); | |
1984 | p += l; | |
1985 | ||
f5b087b5 DR |
1986 | if (flags) { |
1987 | int need_bar = 0; | |
1988 | ||
1989 | if (buffer + maxlen < p + 2) | |
1990 | return -ENOSPC; | |
1991 | *p++ = '='; | |
1992 | ||
1993 | if (flags & MPOL_F_STATIC_NODES) | |
1994 | p += sprintf(p, "%sstatic", need_bar++ ? "|" : ""); | |
4c50bc01 DR |
1995 | if (flags & MPOL_F_RELATIVE_NODES) |
1996 | p += sprintf(p, "%srelative", need_bar++ ? "|" : ""); | |
f5b087b5 DR |
1997 | } |
1998 | ||
1a75a6c8 CL |
1999 | if (!nodes_empty(nodes)) { |
2000 | if (buffer + maxlen < p + 2) | |
2001 | return -ENOSPC; | |
2002 | *p++ = '='; | |
2003 | p += nodelist_scnprintf(p, buffer + maxlen - p, nodes); | |
2004 | } | |
2005 | return p - buffer; | |
2006 | } | |
2007 | ||
2008 | struct numa_maps { | |
2009 | unsigned long pages; | |
2010 | unsigned long anon; | |
397874df CL |
2011 | unsigned long active; |
2012 | unsigned long writeback; | |
1a75a6c8 | 2013 | unsigned long mapcount_max; |
397874df CL |
2014 | unsigned long dirty; |
2015 | unsigned long swapcache; | |
1a75a6c8 CL |
2016 | unsigned long node[MAX_NUMNODES]; |
2017 | }; | |
2018 | ||
397874df | 2019 | static void gather_stats(struct page *page, void *private, int pte_dirty) |
1a75a6c8 CL |
2020 | { |
2021 | struct numa_maps *md = private; | |
2022 | int count = page_mapcount(page); | |
2023 | ||
397874df CL |
2024 | md->pages++; |
2025 | if (pte_dirty || PageDirty(page)) | |
2026 | md->dirty++; | |
1a75a6c8 | 2027 | |
397874df CL |
2028 | if (PageSwapCache(page)) |
2029 | md->swapcache++; | |
1a75a6c8 | 2030 | |
397874df CL |
2031 | if (PageActive(page)) |
2032 | md->active++; | |
2033 | ||
2034 | if (PageWriteback(page)) | |
2035 | md->writeback++; | |
1a75a6c8 CL |
2036 | |
2037 | if (PageAnon(page)) | |
2038 | md->anon++; | |
2039 | ||
397874df CL |
2040 | if (count > md->mapcount_max) |
2041 | md->mapcount_max = count; | |
2042 | ||
1a75a6c8 | 2043 | md->node[page_to_nid(page)]++; |
1a75a6c8 CL |
2044 | } |
2045 | ||
7f709ed0 | 2046 | #ifdef CONFIG_HUGETLB_PAGE |
397874df CL |
2047 | static void check_huge_range(struct vm_area_struct *vma, |
2048 | unsigned long start, unsigned long end, | |
2049 | struct numa_maps *md) | |
2050 | { | |
2051 | unsigned long addr; | |
2052 | struct page *page; | |
2053 | ||
2054 | for (addr = start; addr < end; addr += HPAGE_SIZE) { | |
2055 | pte_t *ptep = huge_pte_offset(vma->vm_mm, addr & HPAGE_MASK); | |
2056 | pte_t pte; | |
2057 | ||
2058 | if (!ptep) | |
2059 | continue; | |
2060 | ||
2061 | pte = *ptep; | |
2062 | if (pte_none(pte)) | |
2063 | continue; | |
2064 | ||
2065 | page = pte_page(pte); | |
2066 | if (!page) | |
2067 | continue; | |
2068 | ||
2069 | gather_stats(page, md, pte_dirty(*ptep)); | |
2070 | } | |
2071 | } | |
7f709ed0 AM |
2072 | #else |
2073 | static inline void check_huge_range(struct vm_area_struct *vma, | |
2074 | unsigned long start, unsigned long end, | |
2075 | struct numa_maps *md) | |
2076 | { | |
2077 | } | |
2078 | #endif | |
397874df | 2079 | |
1a75a6c8 CL |
2080 | int show_numa_map(struct seq_file *m, void *v) |
2081 | { | |
99f89551 | 2082 | struct proc_maps_private *priv = m->private; |
1a75a6c8 CL |
2083 | struct vm_area_struct *vma = v; |
2084 | struct numa_maps *md; | |
397874df CL |
2085 | struct file *file = vma->vm_file; |
2086 | struct mm_struct *mm = vma->vm_mm; | |
480eccf9 | 2087 | struct mempolicy *pol; |
1a75a6c8 CL |
2088 | int n; |
2089 | char buffer[50]; | |
2090 | ||
397874df | 2091 | if (!mm) |
1a75a6c8 CL |
2092 | return 0; |
2093 | ||
2094 | md = kzalloc(sizeof(struct numa_maps), GFP_KERNEL); | |
2095 | if (!md) | |
2096 | return 0; | |
2097 | ||
480eccf9 LS |
2098 | pol = get_vma_policy(priv->task, vma, vma->vm_start); |
2099 | mpol_to_str(buffer, sizeof(buffer), pol); | |
52cd3b07 | 2100 | mpol_cond_put(pol); |
397874df CL |
2101 | |
2102 | seq_printf(m, "%08lx %s", vma->vm_start, buffer); | |
2103 | ||
2104 | if (file) { | |
2105 | seq_printf(m, " file="); | |
c32c2f63 | 2106 | seq_path(m, &file->f_path, "\n\t= "); |
397874df CL |
2107 | } else if (vma->vm_start <= mm->brk && vma->vm_end >= mm->start_brk) { |
2108 | seq_printf(m, " heap"); | |
2109 | } else if (vma->vm_start <= mm->start_stack && | |
2110 | vma->vm_end >= mm->start_stack) { | |
2111 | seq_printf(m, " stack"); | |
2112 | } | |
2113 | ||
2114 | if (is_vm_hugetlb_page(vma)) { | |
2115 | check_huge_range(vma, vma->vm_start, vma->vm_end, md); | |
2116 | seq_printf(m, " huge"); | |
2117 | } else { | |
a57ebfdb | 2118 | check_pgd_range(vma, vma->vm_start, vma->vm_end, |
56bbd65d | 2119 | &node_states[N_HIGH_MEMORY], MPOL_MF_STATS, md); |
397874df CL |
2120 | } |
2121 | ||
2122 | if (!md->pages) | |
2123 | goto out; | |
1a75a6c8 | 2124 | |
397874df CL |
2125 | if (md->anon) |
2126 | seq_printf(m," anon=%lu",md->anon); | |
1a75a6c8 | 2127 | |
397874df CL |
2128 | if (md->dirty) |
2129 | seq_printf(m," dirty=%lu",md->dirty); | |
1a75a6c8 | 2130 | |
397874df CL |
2131 | if (md->pages != md->anon && md->pages != md->dirty) |
2132 | seq_printf(m, " mapped=%lu", md->pages); | |
1a75a6c8 | 2133 | |
397874df CL |
2134 | if (md->mapcount_max > 1) |
2135 | seq_printf(m, " mapmax=%lu", md->mapcount_max); | |
1a75a6c8 | 2136 | |
397874df CL |
2137 | if (md->swapcache) |
2138 | seq_printf(m," swapcache=%lu", md->swapcache); | |
2139 | ||
2140 | if (md->active < md->pages && !is_vm_hugetlb_page(vma)) | |
2141 | seq_printf(m," active=%lu", md->active); | |
2142 | ||
2143 | if (md->writeback) | |
2144 | seq_printf(m," writeback=%lu", md->writeback); | |
2145 | ||
56bbd65d | 2146 | for_each_node_state(n, N_HIGH_MEMORY) |
397874df CL |
2147 | if (md->node[n]) |
2148 | seq_printf(m, " N%d=%lu", n, md->node[n]); | |
2149 | out: | |
2150 | seq_putc(m, '\n'); | |
1a75a6c8 CL |
2151 | kfree(md); |
2152 | ||
2153 | if (m->count < m->size) | |
99f89551 | 2154 | m->version = (vma != priv->tail_vma) ? vma->vm_start : 0; |
1a75a6c8 CL |
2155 | return 0; |
2156 | } |