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. |
| 66 | could replace all the switch()es with a mempolicy_ops structure. |
| 67 | */ |
| 68 | |
| 69 | #include <linux/mempolicy.h> |
| 70 | #include <linux/mm.h> |
| 71 | #include <linux/highmem.h> |
| 72 | #include <linux/hugetlb.h> |
| 73 | #include <linux/kernel.h> |
| 74 | #include <linux/sched.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | #include <linux/nodemask.h> |
| 76 | #include <linux/cpuset.h> |
| 77 | #include <linux/gfp.h> |
| 78 | #include <linux/slab.h> |
| 79 | #include <linux/string.h> |
| 80 | #include <linux/module.h> |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 81 | #include <linux/nsproxy.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | #include <linux/interrupt.h> |
| 83 | #include <linux/init.h> |
| 84 | #include <linux/compat.h> |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 85 | #include <linux/swap.h> |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 86 | #include <linux/seq_file.h> |
| 87 | #include <linux/proc_fs.h> |
Christoph Lameter | b20a350 | 2006-03-22 00:09:12 -0800 | [diff] [blame] | 88 | #include <linux/migrate.h> |
Christoph Lameter | 95a402c | 2006-06-23 02:03:53 -0700 | [diff] [blame] | 89 | #include <linux/rmap.h> |
David Quigley | 86c3a76 | 2006-06-23 02:04:02 -0700 | [diff] [blame] | 90 | #include <linux/security.h> |
Adrian Bunk | dbcb0f1 | 2007-10-16 01:26:26 -0700 | [diff] [blame] | 91 | #include <linux/syscalls.h> |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 92 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | #include <asm/tlbflush.h> |
| 94 | #include <asm/uaccess.h> |
| 95 | |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 96 | /* Internal flags */ |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 97 | #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] | 98 | #define MPOL_MF_INVERT (MPOL_MF_INTERNAL << 1) /* Invert check for nodemask */ |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 99 | #define MPOL_MF_STATS (MPOL_MF_INTERNAL << 2) /* Gather statistics */ |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 100 | |
Pekka Enberg | fcc234f | 2006-03-22 00:08:13 -0800 | [diff] [blame] | 101 | static struct kmem_cache *policy_cache; |
| 102 | static struct kmem_cache *sn_cache; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | /* Highest zone. An specific allocation for a zone below that is not |
| 105 | policied. */ |
Christoph Lameter | 6267276 | 2007-02-10 01:43:07 -0800 | [diff] [blame] | 106 | enum zone_type policy_zone = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | |
Andi Kleen | d42c699 | 2005-07-06 19:56:03 +0200 | [diff] [blame] | 108 | struct mempolicy default_policy = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | .refcnt = ATOMIC_INIT(1), /* never free it */ |
| 110 | .policy = MPOL_DEFAULT, |
| 111 | }; |
| 112 | |
Adrian Bunk | dbcb0f1 | 2007-10-16 01:26:26 -0700 | [diff] [blame] | 113 | static void mpol_rebind_policy(struct mempolicy *pol, |
| 114 | const nodemask_t *newmask); |
| 115 | |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 116 | /* Check that the nodemask contains at least one populated zone */ |
| 117 | static int is_valid_nodemask(nodemask_t *nodemask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | { |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 119 | int nd, k; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 121 | /* Check that there is something useful in this mask */ |
| 122 | k = policy_zone; |
| 123 | |
| 124 | for_each_node_mask(nd, *nodemask) { |
| 125 | struct zone *z; |
| 126 | |
| 127 | for (k = 0; k <= policy_zone; k++) { |
| 128 | z = &NODE_DATA(nd)->node_zones[k]; |
| 129 | if (z->present_pages > 0) |
| 130 | return 1; |
Andi Kleen | dd942ae | 2006-02-17 01:39:16 +0100 | [diff] [blame] | 131 | } |
| 132 | } |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 133 | |
| 134 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | } |
| 136 | |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 137 | static inline int mpol_store_user_nodemask(const struct mempolicy *pol) |
| 138 | { |
David Rientjes | 4c50bc0 | 2008-04-28 02:12:30 -0700 | [diff] [blame^] | 139 | return pol->flags & (MPOL_F_STATIC_NODES | MPOL_F_RELATIVE_NODES); |
| 140 | } |
| 141 | |
| 142 | static void mpol_relative_nodemask(nodemask_t *ret, const nodemask_t *orig, |
| 143 | const nodemask_t *rel) |
| 144 | { |
| 145 | nodemask_t tmp; |
| 146 | nodes_fold(tmp, *orig, nodes_weight(*rel)); |
| 147 | nodes_onto(*ret, tmp, *rel); |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 148 | } |
| 149 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | /* Create a new policy */ |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 151 | static struct mempolicy *mpol_new(unsigned short mode, unsigned short flags, |
| 152 | nodemask_t *nodes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | { |
| 154 | struct mempolicy *policy; |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 155 | nodemask_t cpuset_context_nmask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 157 | pr_debug("setting mode %d flags %d nodes[0] %lx\n", |
| 158 | mode, flags, nodes ? nodes_addr(*nodes)[0] : -1); |
Paul Mundt | 140d5a4 | 2007-07-15 23:38:16 -0700 | [diff] [blame] | 159 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | if (mode == MPOL_DEFAULT) |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 161 | return (nodes && nodes_weight(*nodes)) ? ERR_PTR(-EINVAL) : |
| 162 | NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | policy = kmem_cache_alloc(policy_cache, GFP_KERNEL); |
| 164 | if (!policy) |
| 165 | return ERR_PTR(-ENOMEM); |
| 166 | atomic_set(&policy->refcnt, 1); |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 167 | cpuset_update_task_memory_state(); |
David Rientjes | 4c50bc0 | 2008-04-28 02:12:30 -0700 | [diff] [blame^] | 168 | if (flags & MPOL_F_RELATIVE_NODES) |
| 169 | mpol_relative_nodemask(&cpuset_context_nmask, nodes, |
| 170 | &cpuset_current_mems_allowed); |
| 171 | else |
| 172 | nodes_and(cpuset_context_nmask, *nodes, |
| 173 | cpuset_current_mems_allowed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | switch (mode) { |
| 175 | case MPOL_INTERLEAVE: |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 176 | if (nodes_empty(*nodes) || nodes_empty(cpuset_context_nmask)) |
| 177 | goto free; |
| 178 | policy->v.nodes = cpuset_context_nmask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | break; |
| 180 | case MPOL_PREFERRED: |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 181 | policy->v.preferred_node = first_node(cpuset_context_nmask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | if (policy->v.preferred_node >= MAX_NUMNODES) |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 183 | goto free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | break; |
| 185 | case MPOL_BIND: |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 186 | if (!is_valid_nodemask(&cpuset_context_nmask)) |
| 187 | goto free; |
| 188 | policy->v.nodes = cpuset_context_nmask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | break; |
David Rientjes | a3b51e0 | 2008-04-28 02:12:23 -0700 | [diff] [blame] | 190 | default: |
| 191 | BUG(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | } |
| 193 | policy->policy = mode; |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 194 | policy->flags = flags; |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 195 | if (mpol_store_user_nodemask(policy)) |
| 196 | policy->w.user_nodemask = *nodes; |
| 197 | else |
| 198 | policy->w.cpuset_mems_allowed = cpuset_mems_allowed(current); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | return policy; |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 200 | |
| 201 | free: |
| 202 | kmem_cache_free(policy_cache, policy); |
| 203 | return ERR_PTR(-EINVAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | } |
| 205 | |
Christoph Lameter | 397874d | 2006-03-06 15:42:53 -0800 | [diff] [blame] | 206 | static void gather_stats(struct page *, void *, int pte_dirty); |
Christoph Lameter | fc30128 | 2006-01-18 17:42:29 -0800 | [diff] [blame] | 207 | static void migrate_page_add(struct page *page, struct list_head *pagelist, |
| 208 | unsigned long flags); |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 209 | |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 210 | /* Scan through pages checking if pages follow certain conditions. */ |
Nick Piggin | b581003 | 2005-10-29 18:16:12 -0700 | [diff] [blame] | 211 | 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] | 212 | unsigned long addr, unsigned long end, |
| 213 | const nodemask_t *nodes, unsigned long flags, |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 214 | void *private) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | { |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 216 | pte_t *orig_pte; |
| 217 | pte_t *pte; |
Hugh Dickins | 705e87c | 2005-10-29 18:16:27 -0700 | [diff] [blame] | 218 | spinlock_t *ptl; |
Hugh Dickins | 941150a | 2005-06-21 17:15:06 -0700 | [diff] [blame] | 219 | |
Hugh Dickins | 705e87c | 2005-10-29 18:16:27 -0700 | [diff] [blame] | 220 | 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] | 221 | do { |
Linus Torvalds | 6aab341 | 2005-11-28 14:34:23 -0800 | [diff] [blame] | 222 | struct page *page; |
Andy Whitcroft | 25ba77c | 2006-12-06 20:33:03 -0800 | [diff] [blame] | 223 | int nid; |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 224 | |
| 225 | if (!pte_present(*pte)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | continue; |
Linus Torvalds | 6aab341 | 2005-11-28 14:34:23 -0800 | [diff] [blame] | 227 | page = vm_normal_page(vma, addr, *pte); |
| 228 | if (!page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | continue; |
Nick Piggin | 053837f | 2006-01-18 17:42:27 -0800 | [diff] [blame] | 230 | /* |
| 231 | * The check for PageReserved here is important to avoid |
| 232 | * handling zero pages and other pages that may have been |
| 233 | * marked special by the system. |
| 234 | * |
| 235 | * If the PageReserved would not be checked here then f.e. |
| 236 | * the location of the zero page could have an influence |
| 237 | * on MPOL_MF_STRICT, zero pages would be counted for |
| 238 | * the per node stats, and there would be useless attempts |
| 239 | * to put zero pages on the migration list. |
| 240 | */ |
Christoph Lameter | f4598c8 | 2006-01-12 01:05:20 -0800 | [diff] [blame] | 241 | if (PageReserved(page)) |
| 242 | continue; |
Linus Torvalds | 6aab341 | 2005-11-28 14:34:23 -0800 | [diff] [blame] | 243 | nid = page_to_nid(page); |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 244 | if (node_isset(nid, *nodes) == !!(flags & MPOL_MF_INVERT)) |
| 245 | continue; |
| 246 | |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 247 | if (flags & MPOL_MF_STATS) |
Christoph Lameter | 397874d | 2006-03-06 15:42:53 -0800 | [diff] [blame] | 248 | gather_stats(page, private, pte_dirty(*pte)); |
Nick Piggin | 053837f | 2006-01-18 17:42:27 -0800 | [diff] [blame] | 249 | else if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) |
Christoph Lameter | fc30128 | 2006-01-18 17:42:29 -0800 | [diff] [blame] | 250 | migrate_page_add(page, private, flags); |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 251 | else |
| 252 | break; |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 253 | } while (pte++, addr += PAGE_SIZE, addr != end); |
Hugh Dickins | 705e87c | 2005-10-29 18:16:27 -0700 | [diff] [blame] | 254 | pte_unmap_unlock(orig_pte, ptl); |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 255 | return addr != end; |
| 256 | } |
| 257 | |
Nick Piggin | b581003 | 2005-10-29 18:16:12 -0700 | [diff] [blame] | 258 | 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] | 259 | unsigned long addr, unsigned long end, |
| 260 | const nodemask_t *nodes, unsigned long flags, |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 261 | void *private) |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 262 | { |
| 263 | pmd_t *pmd; |
| 264 | unsigned long next; |
| 265 | |
| 266 | pmd = pmd_offset(pud, addr); |
| 267 | do { |
| 268 | next = pmd_addr_end(addr, end); |
| 269 | if (pmd_none_or_clear_bad(pmd)) |
| 270 | continue; |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 271 | if (check_pte_range(vma, pmd, addr, next, nodes, |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 272 | flags, private)) |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 273 | return -EIO; |
| 274 | } while (pmd++, addr = next, addr != end); |
| 275 | return 0; |
| 276 | } |
| 277 | |
Nick Piggin | b581003 | 2005-10-29 18:16:12 -0700 | [diff] [blame] | 278 | 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] | 279 | unsigned long addr, unsigned long end, |
| 280 | const nodemask_t *nodes, unsigned long flags, |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 281 | void *private) |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 282 | { |
| 283 | pud_t *pud; |
| 284 | unsigned long next; |
| 285 | |
| 286 | pud = pud_offset(pgd, addr); |
| 287 | do { |
| 288 | next = pud_addr_end(addr, end); |
| 289 | if (pud_none_or_clear_bad(pud)) |
| 290 | continue; |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 291 | if (check_pmd_range(vma, pud, addr, next, nodes, |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 292 | flags, private)) |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 293 | return -EIO; |
| 294 | } while (pud++, addr = next, addr != end); |
| 295 | return 0; |
| 296 | } |
| 297 | |
Nick Piggin | b581003 | 2005-10-29 18:16:12 -0700 | [diff] [blame] | 298 | static inline int check_pgd_range(struct vm_area_struct *vma, |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 299 | unsigned long addr, unsigned long end, |
| 300 | const nodemask_t *nodes, unsigned long flags, |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 301 | void *private) |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 302 | { |
| 303 | pgd_t *pgd; |
| 304 | unsigned long next; |
| 305 | |
Nick Piggin | b581003 | 2005-10-29 18:16:12 -0700 | [diff] [blame] | 306 | pgd = pgd_offset(vma->vm_mm, addr); |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 307 | do { |
| 308 | next = pgd_addr_end(addr, end); |
| 309 | if (pgd_none_or_clear_bad(pgd)) |
| 310 | continue; |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 311 | if (check_pud_range(vma, pgd, addr, next, nodes, |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 312 | flags, private)) |
Hugh Dickins | 91612e0 | 2005-06-21 17:15:07 -0700 | [diff] [blame] | 313 | return -EIO; |
| 314 | } while (pgd++, addr = next, addr != end); |
| 315 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | } |
| 317 | |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 318 | /* |
| 319 | * Check if all pages in a range are on a set of nodes. |
| 320 | * If pagelist != NULL then isolate pages from the LRU and |
| 321 | * put them on the pagelist. |
| 322 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | static struct vm_area_struct * |
| 324 | check_range(struct mm_struct *mm, unsigned long start, unsigned long end, |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 325 | const nodemask_t *nodes, unsigned long flags, void *private) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | { |
| 327 | int err; |
| 328 | struct vm_area_struct *first, *vma, *prev; |
| 329 | |
Christoph Lameter | 90036ee | 2006-03-16 23:03:59 -0800 | [diff] [blame] | 330 | if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) { |
Christoph Lameter | 90036ee | 2006-03-16 23:03:59 -0800 | [diff] [blame] | 331 | |
Christoph Lameter | b20a350 | 2006-03-22 00:09:12 -0800 | [diff] [blame] | 332 | err = migrate_prep(); |
| 333 | if (err) |
| 334 | return ERR_PTR(err); |
Christoph Lameter | 90036ee | 2006-03-16 23:03:59 -0800 | [diff] [blame] | 335 | } |
Nick Piggin | 053837f | 2006-01-18 17:42:27 -0800 | [diff] [blame] | 336 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | first = find_vma(mm, start); |
| 338 | if (!first) |
| 339 | return ERR_PTR(-EFAULT); |
| 340 | prev = NULL; |
| 341 | for (vma = first; vma && vma->vm_start < end; vma = vma->vm_next) { |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 342 | if (!(flags & MPOL_MF_DISCONTIG_OK)) { |
| 343 | if (!vma->vm_next && vma->vm_end < end) |
| 344 | return ERR_PTR(-EFAULT); |
| 345 | if (prev && prev->vm_end < vma->vm_start) |
| 346 | return ERR_PTR(-EFAULT); |
| 347 | } |
| 348 | if (!is_vm_hugetlb_page(vma) && |
| 349 | ((flags & MPOL_MF_STRICT) || |
| 350 | ((flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) && |
| 351 | vma_migratable(vma)))) { |
Andi Kleen | 5b952b3 | 2005-09-13 01:25:08 -0700 | [diff] [blame] | 352 | unsigned long endvma = vma->vm_end; |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 353 | |
Andi Kleen | 5b952b3 | 2005-09-13 01:25:08 -0700 | [diff] [blame] | 354 | if (endvma > end) |
| 355 | endvma = end; |
| 356 | if (vma->vm_start > start) |
| 357 | start = vma->vm_start; |
Christoph Lameter | dc9aa5b | 2006-01-08 01:00:50 -0800 | [diff] [blame] | 358 | err = check_pgd_range(vma, start, endvma, nodes, |
Christoph Lameter | 38e3586 | 2006-01-08 01:01:01 -0800 | [diff] [blame] | 359 | flags, private); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | if (err) { |
| 361 | first = ERR_PTR(err); |
| 362 | break; |
| 363 | } |
| 364 | } |
| 365 | prev = vma; |
| 366 | } |
| 367 | return first; |
| 368 | } |
| 369 | |
| 370 | /* Apply policy to a single VMA */ |
| 371 | static int policy_vma(struct vm_area_struct *vma, struct mempolicy *new) |
| 372 | { |
| 373 | int err = 0; |
| 374 | struct mempolicy *old = vma->vm_policy; |
| 375 | |
Paul Mundt | 140d5a4 | 2007-07-15 23:38:16 -0700 | [diff] [blame] | 376 | 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] | 377 | vma->vm_start, vma->vm_end, vma->vm_pgoff, |
| 378 | vma->vm_ops, vma->vm_file, |
| 379 | vma->vm_ops ? vma->vm_ops->set_policy : NULL); |
| 380 | |
| 381 | if (vma->vm_ops && vma->vm_ops->set_policy) |
| 382 | err = vma->vm_ops->set_policy(vma, new); |
| 383 | if (!err) { |
| 384 | mpol_get(new); |
| 385 | vma->vm_policy = new; |
| 386 | mpol_free(old); |
| 387 | } |
| 388 | return err; |
| 389 | } |
| 390 | |
| 391 | /* Step 2: apply policy to a range and do splits. */ |
| 392 | static int mbind_range(struct vm_area_struct *vma, unsigned long start, |
| 393 | unsigned long end, struct mempolicy *new) |
| 394 | { |
| 395 | struct vm_area_struct *next; |
| 396 | int err; |
| 397 | |
| 398 | err = 0; |
| 399 | for (; vma && vma->vm_start < end; vma = next) { |
| 400 | next = vma->vm_next; |
| 401 | if (vma->vm_start < start) |
| 402 | err = split_vma(vma->vm_mm, vma, start, 1); |
| 403 | if (!err && vma->vm_end > end) |
| 404 | err = split_vma(vma->vm_mm, vma, end, 0); |
| 405 | if (!err) |
| 406 | err = policy_vma(vma, new); |
| 407 | if (err) |
| 408 | break; |
| 409 | } |
| 410 | return err; |
| 411 | } |
| 412 | |
Paul Jackson | c61afb1 | 2006-03-24 03:16:08 -0800 | [diff] [blame] | 413 | /* |
| 414 | * Update task->flags PF_MEMPOLICY bit: set iff non-default |
| 415 | * mempolicy. Allows more rapid checking of this (combined perhaps |
| 416 | * with other PF_* flag bits) on memory allocation hot code paths. |
| 417 | * |
| 418 | * If called from outside this file, the task 'p' should -only- be |
| 419 | * a newly forked child not yet visible on the task list, because |
| 420 | * manipulating the task flags of a visible task is not safe. |
| 421 | * |
| 422 | * The above limitation is why this routine has the funny name |
| 423 | * mpol_fix_fork_child_flag(). |
| 424 | * |
| 425 | * It is also safe to call this with a task pointer of current, |
| 426 | * which the static wrapper mpol_set_task_struct_flag() does, |
| 427 | * for use within this file. |
| 428 | */ |
| 429 | |
| 430 | void mpol_fix_fork_child_flag(struct task_struct *p) |
| 431 | { |
| 432 | if (p->mempolicy) |
| 433 | p->flags |= PF_MEMPOLICY; |
| 434 | else |
| 435 | p->flags &= ~PF_MEMPOLICY; |
| 436 | } |
| 437 | |
| 438 | static void mpol_set_task_struct_flag(void) |
| 439 | { |
| 440 | mpol_fix_fork_child_flag(current); |
| 441 | } |
| 442 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | /* Set the process memory policy */ |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 444 | static long do_set_mempolicy(unsigned short mode, unsigned short flags, |
| 445 | nodemask_t *nodes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | struct mempolicy *new; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 449 | new = mpol_new(mode, flags, nodes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | if (IS_ERR(new)) |
| 451 | return PTR_ERR(new); |
| 452 | mpol_free(current->mempolicy); |
| 453 | current->mempolicy = new; |
Paul Jackson | c61afb1 | 2006-03-24 03:16:08 -0800 | [diff] [blame] | 454 | mpol_set_task_struct_flag(); |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 455 | if (new && new->policy == MPOL_INTERLEAVE && |
| 456 | nodes_weight(new->v.nodes)) |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 457 | current->il_next = first_node(new->v.nodes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | return 0; |
| 459 | } |
| 460 | |
| 461 | /* Fill a zone bitmap for a policy */ |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 462 | static void get_zonemask(struct mempolicy *p, nodemask_t *nodes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | { |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 464 | nodes_clear(*nodes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | switch (p->policy) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | case MPOL_DEFAULT: |
| 467 | break; |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 468 | case MPOL_BIND: |
| 469 | /* Fall through */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | case MPOL_INTERLEAVE: |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 471 | *nodes = p->v.nodes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | break; |
| 473 | case MPOL_PREFERRED: |
Christoph Lameter | 56bbd65 | 2007-10-16 01:25:35 -0700 | [diff] [blame] | 474 | /* or use current node instead of memory_map? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | if (p->v.preferred_node < 0) |
Christoph Lameter | 56bbd65 | 2007-10-16 01:25:35 -0700 | [diff] [blame] | 476 | *nodes = node_states[N_HIGH_MEMORY]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | else |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 478 | node_set(p->v.preferred_node, *nodes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | break; |
| 480 | default: |
| 481 | BUG(); |
| 482 | } |
| 483 | } |
| 484 | |
| 485 | static int lookup_node(struct mm_struct *mm, unsigned long addr) |
| 486 | { |
| 487 | struct page *p; |
| 488 | int err; |
| 489 | |
| 490 | err = get_user_pages(current, mm, addr & PAGE_MASK, 1, 0, 0, &p, NULL); |
| 491 | if (err >= 0) { |
| 492 | err = page_to_nid(p); |
| 493 | put_page(p); |
| 494 | } |
| 495 | return err; |
| 496 | } |
| 497 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | /* Retrieve NUMA policy */ |
Adrian Bunk | dbcb0f1 | 2007-10-16 01:26:26 -0700 | [diff] [blame] | 499 | static long do_get_mempolicy(int *policy, nodemask_t *nmask, |
| 500 | unsigned long addr, unsigned long flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | { |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 502 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | struct mm_struct *mm = current->mm; |
| 504 | struct vm_area_struct *vma = NULL; |
| 505 | struct mempolicy *pol = current->mempolicy; |
| 506 | |
Paul Jackson | cf2a473 | 2006-01-08 01:01:54 -0800 | [diff] [blame] | 507 | cpuset_update_task_memory_state(); |
Lee Schermerhorn | 754af6f | 2007-10-16 01:24:51 -0700 | [diff] [blame] | 508 | if (flags & |
| 509 | ~(unsigned long)(MPOL_F_NODE|MPOL_F_ADDR|MPOL_F_MEMS_ALLOWED)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | return -EINVAL; |
Lee Schermerhorn | 754af6f | 2007-10-16 01:24:51 -0700 | [diff] [blame] | 511 | |
| 512 | if (flags & MPOL_F_MEMS_ALLOWED) { |
| 513 | if (flags & (MPOL_F_NODE|MPOL_F_ADDR)) |
| 514 | return -EINVAL; |
| 515 | *policy = 0; /* just so it's initialized */ |
| 516 | *nmask = cpuset_current_mems_allowed; |
| 517 | return 0; |
| 518 | } |
| 519 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | if (flags & MPOL_F_ADDR) { |
| 521 | down_read(&mm->mmap_sem); |
| 522 | vma = find_vma_intersection(mm, addr, addr+1); |
| 523 | if (!vma) { |
| 524 | up_read(&mm->mmap_sem); |
| 525 | return -EFAULT; |
| 526 | } |
| 527 | if (vma->vm_ops && vma->vm_ops->get_policy) |
| 528 | pol = vma->vm_ops->get_policy(vma, addr); |
| 529 | else |
| 530 | pol = vma->vm_policy; |
| 531 | } else if (addr) |
| 532 | return -EINVAL; |
| 533 | |
| 534 | if (!pol) |
| 535 | pol = &default_policy; |
| 536 | |
| 537 | if (flags & MPOL_F_NODE) { |
| 538 | if (flags & MPOL_F_ADDR) { |
| 539 | err = lookup_node(mm, addr); |
| 540 | if (err < 0) |
| 541 | goto out; |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 542 | *policy = err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | } else if (pol == current->mempolicy && |
| 544 | pol->policy == MPOL_INTERLEAVE) { |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 545 | *policy = current->il_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | } else { |
| 547 | err = -EINVAL; |
| 548 | goto out; |
| 549 | } |
| 550 | } else |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 551 | *policy = pol->policy | pol->flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | |
| 553 | if (vma) { |
| 554 | up_read(¤t->mm->mmap_sem); |
| 555 | vma = NULL; |
| 556 | } |
| 557 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | err = 0; |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 559 | if (nmask) |
| 560 | get_zonemask(pol, nmask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | |
| 562 | out: |
| 563 | if (vma) |
| 564 | up_read(¤t->mm->mmap_sem); |
| 565 | return err; |
| 566 | } |
| 567 | |
Christoph Lameter | b20a350 | 2006-03-22 00:09:12 -0800 | [diff] [blame] | 568 | #ifdef CONFIG_MIGRATION |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 569 | /* |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 570 | * page migration |
| 571 | */ |
Christoph Lameter | fc30128 | 2006-01-18 17:42:29 -0800 | [diff] [blame] | 572 | static void migrate_page_add(struct page *page, struct list_head *pagelist, |
| 573 | unsigned long flags) |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 574 | { |
| 575 | /* |
Christoph Lameter | fc30128 | 2006-01-18 17:42:29 -0800 | [diff] [blame] | 576 | * Avoid migrating a page that is shared with others. |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 577 | */ |
Christoph Lameter | b20a350 | 2006-03-22 00:09:12 -0800 | [diff] [blame] | 578 | if ((flags & MPOL_MF_MOVE_ALL) || page_mapcount(page) == 1) |
| 579 | isolate_lru_page(page, pagelist); |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 580 | } |
| 581 | |
Christoph Lameter | 742755a | 2006-06-23 02:03:55 -0700 | [diff] [blame] | 582 | 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] | 583 | { |
Mel Gorman | 769848c | 2007-07-17 04:03:05 -0700 | [diff] [blame] | 584 | return alloc_pages_node(node, GFP_HIGHUSER_MOVABLE, 0); |
Christoph Lameter | 95a402c | 2006-06-23 02:03:53 -0700 | [diff] [blame] | 585 | } |
| 586 | |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 587 | /* |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 588 | * Migrate pages from one node to a target node. |
| 589 | * Returns error or the number of pages not migrated. |
| 590 | */ |
Adrian Bunk | dbcb0f1 | 2007-10-16 01:26:26 -0700 | [diff] [blame] | 591 | static int migrate_to_node(struct mm_struct *mm, int source, int dest, |
| 592 | int flags) |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 593 | { |
| 594 | nodemask_t nmask; |
| 595 | LIST_HEAD(pagelist); |
| 596 | int err = 0; |
| 597 | |
| 598 | nodes_clear(nmask); |
| 599 | node_set(source, nmask); |
| 600 | |
| 601 | check_range(mm, mm->mmap->vm_start, TASK_SIZE, &nmask, |
| 602 | flags | MPOL_MF_DISCONTIG_OK, &pagelist); |
| 603 | |
Christoph Lameter | aaa994b | 2006-06-23 02:03:52 -0700 | [diff] [blame] | 604 | if (!list_empty(&pagelist)) |
Christoph Lameter | 95a402c | 2006-06-23 02:03:53 -0700 | [diff] [blame] | 605 | err = migrate_pages(&pagelist, new_node_page, dest); |
| 606 | |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 607 | return err; |
| 608 | } |
| 609 | |
| 610 | /* |
| 611 | * Move pages between the two nodesets so as to preserve the physical |
| 612 | * layout as much as possible. |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 613 | * |
| 614 | * Returns the number of page that could not be moved. |
| 615 | */ |
| 616 | int do_migrate_pages(struct mm_struct *mm, |
| 617 | const nodemask_t *from_nodes, const nodemask_t *to_nodes, int flags) |
| 618 | { |
| 619 | LIST_HEAD(pagelist); |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 620 | int busy = 0; |
| 621 | int err = 0; |
| 622 | nodemask_t tmp; |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 623 | |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 624 | down_read(&mm->mmap_sem); |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 625 | |
Christoph Lameter | 7b2259b | 2006-06-25 05:46:48 -0700 | [diff] [blame] | 626 | err = migrate_vmas(mm, from_nodes, to_nodes, flags); |
| 627 | if (err) |
| 628 | goto out; |
| 629 | |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 630 | /* |
| 631 | * Find a 'source' bit set in 'tmp' whose corresponding 'dest' |
| 632 | * bit in 'to' is not also set in 'tmp'. Clear the found 'source' |
| 633 | * bit in 'tmp', and return that <source, dest> pair for migration. |
| 634 | * The pair of nodemasks 'to' and 'from' define the map. |
| 635 | * |
| 636 | * If no pair of bits is found that way, fallback to picking some |
| 637 | * pair of 'source' and 'dest' bits that are not the same. If the |
| 638 | * 'source' and 'dest' bits are the same, this represents a node |
| 639 | * that will be migrating to itself, so no pages need move. |
| 640 | * |
| 641 | * If no bits are left in 'tmp', or if all remaining bits left |
| 642 | * in 'tmp' correspond to the same bit in 'to', return false |
| 643 | * (nothing left to migrate). |
| 644 | * |
| 645 | * This lets us pick a pair of nodes to migrate between, such that |
| 646 | * if possible the dest node is not already occupied by some other |
| 647 | * source node, minimizing the risk of overloading the memory on a |
| 648 | * node that would happen if we migrated incoming memory to a node |
| 649 | * before migrating outgoing memory source that same node. |
| 650 | * |
| 651 | * A single scan of tmp is sufficient. As we go, we remember the |
| 652 | * most recent <s, d> pair that moved (s != d). If we find a pair |
| 653 | * that not only moved, but what's better, moved to an empty slot |
| 654 | * (d is not set in tmp), then we break out then, with that pair. |
| 655 | * Otherwise when we finish scannng from_tmp, we at least have the |
| 656 | * most recent <s, d> pair that moved. If we get all the way through |
| 657 | * the scan of tmp without finding any node that moved, much less |
| 658 | * moved to an empty node, then there is nothing left worth migrating. |
| 659 | */ |
Christoph Lameter | d498471 | 2006-01-08 01:00:55 -0800 | [diff] [blame] | 660 | |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 661 | tmp = *from_nodes; |
| 662 | while (!nodes_empty(tmp)) { |
| 663 | int s,d; |
| 664 | int source = -1; |
| 665 | int dest = 0; |
| 666 | |
| 667 | for_each_node_mask(s, tmp) { |
| 668 | d = node_remap(s, *from_nodes, *to_nodes); |
| 669 | if (s == d) |
| 670 | continue; |
| 671 | |
| 672 | source = s; /* Node moved. Memorize */ |
| 673 | dest = d; |
| 674 | |
| 675 | /* dest not in remaining from nodes? */ |
| 676 | if (!node_isset(dest, tmp)) |
| 677 | break; |
| 678 | } |
| 679 | if (source == -1) |
| 680 | break; |
| 681 | |
| 682 | node_clear(source, tmp); |
| 683 | err = migrate_to_node(mm, source, dest, flags); |
| 684 | if (err > 0) |
| 685 | busy += err; |
| 686 | if (err < 0) |
| 687 | break; |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 688 | } |
Christoph Lameter | 7b2259b | 2006-06-25 05:46:48 -0700 | [diff] [blame] | 689 | out: |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 690 | up_read(&mm->mmap_sem); |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 691 | if (err < 0) |
| 692 | return err; |
| 693 | return busy; |
Christoph Lameter | b20a350 | 2006-03-22 00:09:12 -0800 | [diff] [blame] | 694 | |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 695 | } |
| 696 | |
Lee Schermerhorn | 3ad33b2 | 2007-11-14 16:59:10 -0800 | [diff] [blame] | 697 | /* |
| 698 | * Allocate a new page for page migration based on vma policy. |
| 699 | * Start assuming that page is mapped by vma pointed to by @private. |
| 700 | * Search forward from there, if not. N.B., this assumes that the |
| 701 | * list of pages handed to migrate_pages()--which is how we get here-- |
| 702 | * is in virtual address order. |
| 703 | */ |
Christoph Lameter | 742755a | 2006-06-23 02:03:55 -0700 | [diff] [blame] | 704 | 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] | 705 | { |
| 706 | struct vm_area_struct *vma = (struct vm_area_struct *)private; |
Lee Schermerhorn | 3ad33b2 | 2007-11-14 16:59:10 -0800 | [diff] [blame] | 707 | unsigned long uninitialized_var(address); |
Christoph Lameter | 95a402c | 2006-06-23 02:03:53 -0700 | [diff] [blame] | 708 | |
Lee Schermerhorn | 3ad33b2 | 2007-11-14 16:59:10 -0800 | [diff] [blame] | 709 | while (vma) { |
| 710 | address = page_address_in_vma(page, vma); |
| 711 | if (address != -EFAULT) |
| 712 | break; |
| 713 | vma = vma->vm_next; |
| 714 | } |
| 715 | |
| 716 | /* |
| 717 | * if !vma, alloc_page_vma() will use task or system default policy |
| 718 | */ |
| 719 | return alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma, address); |
Christoph Lameter | 95a402c | 2006-06-23 02:03:53 -0700 | [diff] [blame] | 720 | } |
Christoph Lameter | b20a350 | 2006-03-22 00:09:12 -0800 | [diff] [blame] | 721 | #else |
| 722 | |
| 723 | static void migrate_page_add(struct page *page, struct list_head *pagelist, |
| 724 | unsigned long flags) |
| 725 | { |
| 726 | } |
| 727 | |
| 728 | int do_migrate_pages(struct mm_struct *mm, |
| 729 | const nodemask_t *from_nodes, const nodemask_t *to_nodes, int flags) |
| 730 | { |
| 731 | return -ENOSYS; |
| 732 | } |
Christoph Lameter | 95a402c | 2006-06-23 02:03:53 -0700 | [diff] [blame] | 733 | |
Keith Owens | 6993974 | 2006-10-11 01:21:28 -0700 | [diff] [blame] | 734 | 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] | 735 | { |
| 736 | return NULL; |
| 737 | } |
Christoph Lameter | b20a350 | 2006-03-22 00:09:12 -0800 | [diff] [blame] | 738 | #endif |
| 739 | |
Adrian Bunk | dbcb0f1 | 2007-10-16 01:26:26 -0700 | [diff] [blame] | 740 | static long do_mbind(unsigned long start, unsigned long len, |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 741 | unsigned short mode, unsigned short mode_flags, |
| 742 | nodemask_t *nmask, unsigned long flags) |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 743 | { |
| 744 | struct vm_area_struct *vma; |
| 745 | struct mm_struct *mm = current->mm; |
| 746 | struct mempolicy *new; |
| 747 | unsigned long end; |
| 748 | int err; |
| 749 | LIST_HEAD(pagelist); |
| 750 | |
David Rientjes | a3b51e0 | 2008-04-28 02:12:23 -0700 | [diff] [blame] | 751 | if (flags & ~(unsigned long)(MPOL_MF_STRICT | |
| 752 | MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 753 | return -EINVAL; |
Christoph Lameter | 74c0024 | 2006-03-14 19:50:21 -0800 | [diff] [blame] | 754 | if ((flags & MPOL_MF_MOVE_ALL) && !capable(CAP_SYS_NICE)) |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 755 | return -EPERM; |
| 756 | |
| 757 | if (start & ~PAGE_MASK) |
| 758 | return -EINVAL; |
| 759 | |
| 760 | if (mode == MPOL_DEFAULT) |
| 761 | flags &= ~MPOL_MF_STRICT; |
| 762 | |
| 763 | len = (len + PAGE_SIZE - 1) & PAGE_MASK; |
| 764 | end = start + len; |
| 765 | |
| 766 | if (end < start) |
| 767 | return -EINVAL; |
| 768 | if (end == start) |
| 769 | return 0; |
| 770 | |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 771 | new = mpol_new(mode, mode_flags, nmask); |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 772 | if (IS_ERR(new)) |
| 773 | return PTR_ERR(new); |
| 774 | |
| 775 | /* |
| 776 | * If we are using the default policy then operation |
| 777 | * on discontinuous address spaces is okay after all |
| 778 | */ |
| 779 | if (!new) |
| 780 | flags |= MPOL_MF_DISCONTIG_OK; |
| 781 | |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 782 | pr_debug("mbind %lx-%lx mode:%d flags:%d nodes:%lx\n", |
| 783 | start, start + len, mode, mode_flags, |
| 784 | nmask ? nodes_addr(*nmask)[0] : -1); |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 785 | |
| 786 | down_write(&mm->mmap_sem); |
| 787 | vma = check_range(mm, start, end, nmask, |
| 788 | flags | MPOL_MF_INVERT, &pagelist); |
| 789 | |
| 790 | err = PTR_ERR(vma); |
| 791 | if (!IS_ERR(vma)) { |
| 792 | int nr_failed = 0; |
| 793 | |
| 794 | err = mbind_range(vma, start, end, new); |
Christoph Lameter | 7e2ab15 | 2006-02-01 03:05:40 -0800 | [diff] [blame] | 795 | |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 796 | if (!list_empty(&pagelist)) |
Christoph Lameter | 95a402c | 2006-06-23 02:03:53 -0700 | [diff] [blame] | 797 | nr_failed = migrate_pages(&pagelist, new_vma_page, |
| 798 | (unsigned long)vma); |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 799 | |
| 800 | if (!err && nr_failed && (flags & MPOL_MF_STRICT)) |
| 801 | err = -EIO; |
| 802 | } |
Christoph Lameter | b20a350 | 2006-03-22 00:09:12 -0800 | [diff] [blame] | 803 | |
Christoph Lameter | 6ce3c4c | 2006-01-08 01:01:04 -0800 | [diff] [blame] | 804 | up_write(&mm->mmap_sem); |
| 805 | mpol_free(new); |
| 806 | return err; |
| 807 | } |
| 808 | |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 809 | /* |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 810 | * User space interface with variable sized bitmaps for nodelists. |
| 811 | */ |
| 812 | |
| 813 | /* Copy a node mask from user space. */ |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 814 | static int get_nodes(nodemask_t *nodes, const unsigned long __user *nmask, |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 815 | unsigned long maxnode) |
| 816 | { |
| 817 | unsigned long k; |
| 818 | unsigned long nlongs; |
| 819 | unsigned long endmask; |
| 820 | |
| 821 | --maxnode; |
| 822 | nodes_clear(*nodes); |
| 823 | if (maxnode == 0 || !nmask) |
| 824 | return 0; |
Andi Kleen | a9c930b | 2006-02-20 18:27:59 -0800 | [diff] [blame] | 825 | if (maxnode > PAGE_SIZE*BITS_PER_BYTE) |
Chris Wright | 636f13c | 2006-02-17 13:59:36 -0800 | [diff] [blame] | 826 | return -EINVAL; |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 827 | |
| 828 | nlongs = BITS_TO_LONGS(maxnode); |
| 829 | if ((maxnode % BITS_PER_LONG) == 0) |
| 830 | endmask = ~0UL; |
| 831 | else |
| 832 | endmask = (1UL << (maxnode % BITS_PER_LONG)) - 1; |
| 833 | |
| 834 | /* When the user specified more nodes than supported just check |
| 835 | if the non supported part is all zero. */ |
| 836 | if (nlongs > BITS_TO_LONGS(MAX_NUMNODES)) { |
| 837 | if (nlongs > PAGE_SIZE/sizeof(long)) |
| 838 | return -EINVAL; |
| 839 | for (k = BITS_TO_LONGS(MAX_NUMNODES); k < nlongs; k++) { |
| 840 | unsigned long t; |
| 841 | if (get_user(t, nmask + k)) |
| 842 | return -EFAULT; |
| 843 | if (k == nlongs - 1) { |
| 844 | if (t & endmask) |
| 845 | return -EINVAL; |
| 846 | } else if (t) |
| 847 | return -EINVAL; |
| 848 | } |
| 849 | nlongs = BITS_TO_LONGS(MAX_NUMNODES); |
| 850 | endmask = ~0UL; |
| 851 | } |
| 852 | |
| 853 | if (copy_from_user(nodes_addr(*nodes), nmask, nlongs*sizeof(unsigned long))) |
| 854 | return -EFAULT; |
| 855 | nodes_addr(*nodes)[nlongs-1] &= endmask; |
| 856 | return 0; |
| 857 | } |
| 858 | |
| 859 | /* Copy a kernel node mask to user space */ |
| 860 | static int copy_nodes_to_user(unsigned long __user *mask, unsigned long maxnode, |
| 861 | nodemask_t *nodes) |
| 862 | { |
| 863 | unsigned long copy = ALIGN(maxnode-1, 64) / 8; |
| 864 | const int nbytes = BITS_TO_LONGS(MAX_NUMNODES) * sizeof(long); |
| 865 | |
| 866 | if (copy > nbytes) { |
| 867 | if (copy > PAGE_SIZE) |
| 868 | return -EINVAL; |
| 869 | if (clear_user((char __user *)mask + nbytes, copy - nbytes)) |
| 870 | return -EFAULT; |
| 871 | copy = nbytes; |
| 872 | } |
| 873 | return copy_to_user(mask, nodes_addr(*nodes), copy) ? -EFAULT : 0; |
| 874 | } |
| 875 | |
| 876 | asmlinkage long sys_mbind(unsigned long start, unsigned long len, |
| 877 | unsigned long mode, |
| 878 | unsigned long __user *nmask, unsigned long maxnode, |
| 879 | unsigned flags) |
| 880 | { |
| 881 | nodemask_t nodes; |
| 882 | int err; |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 883 | unsigned short mode_flags; |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 884 | |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 885 | mode_flags = mode & MPOL_MODE_FLAGS; |
| 886 | mode &= ~MPOL_MODE_FLAGS; |
David Rientjes | a3b51e0 | 2008-04-28 02:12:23 -0700 | [diff] [blame] | 887 | if (mode >= MPOL_MAX) |
| 888 | return -EINVAL; |
David Rientjes | 4c50bc0 | 2008-04-28 02:12:30 -0700 | [diff] [blame^] | 889 | if ((mode_flags & MPOL_F_STATIC_NODES) && |
| 890 | (mode_flags & MPOL_F_RELATIVE_NODES)) |
| 891 | return -EINVAL; |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 892 | err = get_nodes(&nodes, nmask, maxnode); |
| 893 | if (err) |
| 894 | return err; |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 895 | return do_mbind(start, len, mode, mode_flags, &nodes, flags); |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 896 | } |
| 897 | |
| 898 | /* Set the process memory policy */ |
| 899 | asmlinkage long sys_set_mempolicy(int mode, unsigned long __user *nmask, |
| 900 | unsigned long maxnode) |
| 901 | { |
| 902 | int err; |
| 903 | nodemask_t nodes; |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 904 | unsigned short flags; |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 905 | |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 906 | flags = mode & MPOL_MODE_FLAGS; |
| 907 | mode &= ~MPOL_MODE_FLAGS; |
| 908 | if ((unsigned int)mode >= MPOL_MAX) |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 909 | return -EINVAL; |
David Rientjes | 4c50bc0 | 2008-04-28 02:12:30 -0700 | [diff] [blame^] | 910 | if ((flags & MPOL_F_STATIC_NODES) && (flags & MPOL_F_RELATIVE_NODES)) |
| 911 | return -EINVAL; |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 912 | err = get_nodes(&nodes, nmask, maxnode); |
| 913 | if (err) |
| 914 | return err; |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 915 | return do_set_mempolicy(mode, flags, &nodes); |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 916 | } |
| 917 | |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 918 | asmlinkage long sys_migrate_pages(pid_t pid, unsigned long maxnode, |
| 919 | const unsigned long __user *old_nodes, |
| 920 | const unsigned long __user *new_nodes) |
| 921 | { |
| 922 | struct mm_struct *mm; |
| 923 | struct task_struct *task; |
| 924 | nodemask_t old; |
| 925 | nodemask_t new; |
| 926 | nodemask_t task_nodes; |
| 927 | int err; |
| 928 | |
| 929 | err = get_nodes(&old, old_nodes, maxnode); |
| 930 | if (err) |
| 931 | return err; |
| 932 | |
| 933 | err = get_nodes(&new, new_nodes, maxnode); |
| 934 | if (err) |
| 935 | return err; |
| 936 | |
| 937 | /* Find the mm_struct */ |
| 938 | read_lock(&tasklist_lock); |
Pavel Emelyanov | 228ebcb | 2007-10-18 23:40:16 -0700 | [diff] [blame] | 939 | task = pid ? find_task_by_vpid(pid) : current; |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 940 | if (!task) { |
| 941 | read_unlock(&tasklist_lock); |
| 942 | return -ESRCH; |
| 943 | } |
| 944 | mm = get_task_mm(task); |
| 945 | read_unlock(&tasklist_lock); |
| 946 | |
| 947 | if (!mm) |
| 948 | return -EINVAL; |
| 949 | |
| 950 | /* |
| 951 | * Check if this process has the right to modify the specified |
| 952 | * process. The right exists if the process has administrative |
Alexey Dobriyan | 7f927fc | 2006-03-28 01:56:53 -0800 | [diff] [blame] | 953 | * capabilities, superuser privileges or the same |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 954 | * userid as the target process. |
| 955 | */ |
| 956 | if ((current->euid != task->suid) && (current->euid != task->uid) && |
| 957 | (current->uid != task->suid) && (current->uid != task->uid) && |
Christoph Lameter | 74c0024 | 2006-03-14 19:50:21 -0800 | [diff] [blame] | 958 | !capable(CAP_SYS_NICE)) { |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 959 | err = -EPERM; |
| 960 | goto out; |
| 961 | } |
| 962 | |
| 963 | task_nodes = cpuset_mems_allowed(task); |
| 964 | /* Is the user allowed to access the target nodes? */ |
Christoph Lameter | 74c0024 | 2006-03-14 19:50:21 -0800 | [diff] [blame] | 965 | if (!nodes_subset(new, task_nodes) && !capable(CAP_SYS_NICE)) { |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 966 | err = -EPERM; |
| 967 | goto out; |
| 968 | } |
| 969 | |
Lee Schermerhorn | 37b07e4 | 2007-10-16 01:25:39 -0700 | [diff] [blame] | 970 | if (!nodes_subset(new, node_states[N_HIGH_MEMORY])) { |
Christoph Lameter | 3b42d28 | 2007-08-31 00:12:08 -0700 | [diff] [blame] | 971 | err = -EINVAL; |
| 972 | goto out; |
| 973 | } |
| 974 | |
David Quigley | 86c3a76 | 2006-06-23 02:04:02 -0700 | [diff] [blame] | 975 | err = security_task_movememory(task); |
| 976 | if (err) |
| 977 | goto out; |
| 978 | |
Christoph Lameter | 511030b | 2006-02-28 16:58:57 -0800 | [diff] [blame] | 979 | err = do_migrate_pages(mm, &old, &new, |
Christoph Lameter | 74c0024 | 2006-03-14 19:50:21 -0800 | [diff] [blame] | 980 | capable(CAP_SYS_NICE) ? MPOL_MF_MOVE_ALL : MPOL_MF_MOVE); |
Christoph Lameter | 3974388 | 2006-01-08 01:00:51 -0800 | [diff] [blame] | 981 | out: |
| 982 | mmput(mm); |
| 983 | return err; |
| 984 | } |
| 985 | |
| 986 | |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 987 | /* Retrieve NUMA policy */ |
| 988 | asmlinkage long sys_get_mempolicy(int __user *policy, |
| 989 | unsigned long __user *nmask, |
| 990 | unsigned long maxnode, |
| 991 | unsigned long addr, unsigned long flags) |
| 992 | { |
Adrian Bunk | dbcb0f1 | 2007-10-16 01:26:26 -0700 | [diff] [blame] | 993 | int err; |
| 994 | int uninitialized_var(pval); |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 995 | nodemask_t nodes; |
| 996 | |
| 997 | if (nmask != NULL && maxnode < MAX_NUMNODES) |
| 998 | return -EINVAL; |
| 999 | |
| 1000 | err = do_get_mempolicy(&pval, &nodes, addr, flags); |
| 1001 | |
| 1002 | if (err) |
| 1003 | return err; |
| 1004 | |
| 1005 | if (policy && put_user(pval, policy)) |
| 1006 | return -EFAULT; |
| 1007 | |
| 1008 | if (nmask) |
| 1009 | err = copy_nodes_to_user(nmask, maxnode, &nodes); |
| 1010 | |
| 1011 | return err; |
| 1012 | } |
| 1013 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | #ifdef CONFIG_COMPAT |
| 1015 | |
| 1016 | asmlinkage long compat_sys_get_mempolicy(int __user *policy, |
| 1017 | compat_ulong_t __user *nmask, |
| 1018 | compat_ulong_t maxnode, |
| 1019 | compat_ulong_t addr, compat_ulong_t flags) |
| 1020 | { |
| 1021 | long err; |
| 1022 | unsigned long __user *nm = NULL; |
| 1023 | unsigned long nr_bits, alloc_size; |
| 1024 | DECLARE_BITMAP(bm, MAX_NUMNODES); |
| 1025 | |
| 1026 | nr_bits = min_t(unsigned long, maxnode-1, MAX_NUMNODES); |
| 1027 | alloc_size = ALIGN(nr_bits, BITS_PER_LONG) / 8; |
| 1028 | |
| 1029 | if (nmask) |
| 1030 | nm = compat_alloc_user_space(alloc_size); |
| 1031 | |
| 1032 | err = sys_get_mempolicy(policy, nm, nr_bits+1, addr, flags); |
| 1033 | |
| 1034 | if (!err && nmask) { |
| 1035 | err = copy_from_user(bm, nm, alloc_size); |
| 1036 | /* ensure entire bitmap is zeroed */ |
| 1037 | err |= clear_user(nmask, ALIGN(maxnode-1, 8) / 8); |
| 1038 | err |= compat_put_bitmap(nmask, bm, nr_bits); |
| 1039 | } |
| 1040 | |
| 1041 | return err; |
| 1042 | } |
| 1043 | |
| 1044 | asmlinkage long compat_sys_set_mempolicy(int mode, compat_ulong_t __user *nmask, |
| 1045 | compat_ulong_t maxnode) |
| 1046 | { |
| 1047 | long err = 0; |
| 1048 | unsigned long __user *nm = NULL; |
| 1049 | unsigned long nr_bits, alloc_size; |
| 1050 | DECLARE_BITMAP(bm, MAX_NUMNODES); |
| 1051 | |
| 1052 | nr_bits = min_t(unsigned long, maxnode-1, MAX_NUMNODES); |
| 1053 | alloc_size = ALIGN(nr_bits, BITS_PER_LONG) / 8; |
| 1054 | |
| 1055 | if (nmask) { |
| 1056 | err = compat_get_bitmap(bm, nmask, nr_bits); |
| 1057 | nm = compat_alloc_user_space(alloc_size); |
| 1058 | err |= copy_to_user(nm, bm, alloc_size); |
| 1059 | } |
| 1060 | |
| 1061 | if (err) |
| 1062 | return -EFAULT; |
| 1063 | |
| 1064 | return sys_set_mempolicy(mode, nm, nr_bits+1); |
| 1065 | } |
| 1066 | |
| 1067 | asmlinkage long compat_sys_mbind(compat_ulong_t start, compat_ulong_t len, |
| 1068 | compat_ulong_t mode, compat_ulong_t __user *nmask, |
| 1069 | compat_ulong_t maxnode, compat_ulong_t flags) |
| 1070 | { |
| 1071 | long err = 0; |
| 1072 | unsigned long __user *nm = NULL; |
| 1073 | unsigned long nr_bits, alloc_size; |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 1074 | nodemask_t bm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1075 | |
| 1076 | nr_bits = min_t(unsigned long, maxnode-1, MAX_NUMNODES); |
| 1077 | alloc_size = ALIGN(nr_bits, BITS_PER_LONG) / 8; |
| 1078 | |
| 1079 | if (nmask) { |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 1080 | err = compat_get_bitmap(nodes_addr(bm), nmask, nr_bits); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1081 | nm = compat_alloc_user_space(alloc_size); |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 1082 | err |= copy_to_user(nm, nodes_addr(bm), alloc_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1083 | } |
| 1084 | |
| 1085 | if (err) |
| 1086 | return -EFAULT; |
| 1087 | |
| 1088 | return sys_mbind(start, len, mode, nm, nr_bits+1, flags); |
| 1089 | } |
| 1090 | |
| 1091 | #endif |
| 1092 | |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1093 | /* |
| 1094 | * get_vma_policy(@task, @vma, @addr) |
| 1095 | * @task - task for fallback if vma policy == default |
| 1096 | * @vma - virtual memory area whose policy is sought |
| 1097 | * @addr - address in @vma for shared policy lookup |
| 1098 | * |
| 1099 | * Returns effective policy for a VMA at specified address. |
| 1100 | * Falls back to @task or system default policy, as necessary. |
| 1101 | * Returned policy has extra reference count if shared, vma, |
| 1102 | * or some other task's policy [show_numa_maps() can pass |
| 1103 | * @task != current]. It is the caller's responsibility to |
| 1104 | * free the reference in these cases. |
| 1105 | */ |
Christoph Lameter | 48fce34 | 2006-01-08 01:01:03 -0800 | [diff] [blame] | 1106 | static struct mempolicy * get_vma_policy(struct task_struct *task, |
| 1107 | struct vm_area_struct *vma, unsigned long addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1108 | { |
Christoph Lameter | 6e21c8f | 2005-09-03 15:54:45 -0700 | [diff] [blame] | 1109 | struct mempolicy *pol = task->mempolicy; |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1110 | int shared_pol = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | |
| 1112 | if (vma) { |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1113 | if (vma->vm_ops && vma->vm_ops->get_policy) { |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1114 | pol = vma->vm_ops->get_policy(vma, addr); |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1115 | shared_pol = 1; /* if pol non-NULL, add ref below */ |
| 1116 | } else if (vma->vm_policy && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1117 | vma->vm_policy->policy != MPOL_DEFAULT) |
| 1118 | pol = vma->vm_policy; |
| 1119 | } |
| 1120 | if (!pol) |
| 1121 | pol = &default_policy; |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1122 | else if (!shared_pol && pol != current->mempolicy) |
| 1123 | mpol_get(pol); /* vma or other task's policy */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1124 | return pol; |
| 1125 | } |
| 1126 | |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1127 | /* Return a nodemask representing a mempolicy */ |
| 1128 | static nodemask_t *nodemask_policy(gfp_t gfp, struct mempolicy *policy) |
| 1129 | { |
| 1130 | /* Lower zones don't get a nodemask applied for MPOL_BIND */ |
| 1131 | if (unlikely(policy->policy == MPOL_BIND) && |
| 1132 | gfp_zone(gfp) >= policy_zone && |
| 1133 | cpuset_nodemask_valid_mems_allowed(&policy->v.nodes)) |
| 1134 | return &policy->v.nodes; |
| 1135 | |
| 1136 | return NULL; |
| 1137 | } |
| 1138 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1139 | /* Return a zonelist representing a mempolicy */ |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1140 | static struct zonelist *zonelist_policy(gfp_t gfp, struct mempolicy *policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1141 | { |
| 1142 | int nd; |
| 1143 | |
| 1144 | switch (policy->policy) { |
| 1145 | case MPOL_PREFERRED: |
| 1146 | nd = policy->v.preferred_node; |
| 1147 | if (nd < 0) |
| 1148 | nd = numa_node_id(); |
| 1149 | break; |
| 1150 | case MPOL_BIND: |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1151 | /* |
| 1152 | * Normally, MPOL_BIND allocations node-local are node-local |
| 1153 | * within the allowed nodemask. However, if __GFP_THISNODE is |
| 1154 | * set and the current node is part of the mask, we use the |
| 1155 | * the zonelist for the first node in the mask instead. |
| 1156 | */ |
| 1157 | nd = numa_node_id(); |
| 1158 | if (unlikely(gfp & __GFP_THISNODE) && |
| 1159 | unlikely(!node_isset(nd, policy->v.nodes))) |
| 1160 | nd = first_node(policy->v.nodes); |
| 1161 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1162 | case MPOL_INTERLEAVE: /* should not happen */ |
| 1163 | case MPOL_DEFAULT: |
| 1164 | nd = numa_node_id(); |
| 1165 | break; |
| 1166 | default: |
| 1167 | nd = 0; |
| 1168 | BUG(); |
| 1169 | } |
Mel Gorman | 0e88460 | 2008-04-28 02:12:14 -0700 | [diff] [blame] | 1170 | return node_zonelist(nd, gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1171 | } |
| 1172 | |
| 1173 | /* Do dynamic interleaving for a process */ |
| 1174 | static unsigned interleave_nodes(struct mempolicy *policy) |
| 1175 | { |
| 1176 | unsigned nid, next; |
| 1177 | struct task_struct *me = current; |
| 1178 | |
| 1179 | nid = me->il_next; |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 1180 | next = next_node(nid, policy->v.nodes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1181 | if (next >= MAX_NUMNODES) |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 1182 | next = first_node(policy->v.nodes); |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 1183 | if (next < MAX_NUMNODES) |
| 1184 | me->il_next = next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1185 | return nid; |
| 1186 | } |
| 1187 | |
Christoph Lameter | dc85da1 | 2006-01-18 17:42:36 -0800 | [diff] [blame] | 1188 | /* |
| 1189 | * Depending on the memory policy provide a node from which to allocate the |
| 1190 | * next slab entry. |
| 1191 | */ |
| 1192 | unsigned slab_node(struct mempolicy *policy) |
| 1193 | { |
David Rientjes | a3b51e0 | 2008-04-28 02:12:23 -0700 | [diff] [blame] | 1194 | unsigned short pol = policy ? policy->policy : MPOL_DEFAULT; |
Christoph Lameter | 765c450 | 2006-09-27 01:50:08 -0700 | [diff] [blame] | 1195 | |
| 1196 | switch (pol) { |
Christoph Lameter | dc85da1 | 2006-01-18 17:42:36 -0800 | [diff] [blame] | 1197 | case MPOL_INTERLEAVE: |
| 1198 | return interleave_nodes(policy); |
| 1199 | |
Mel Gorman | dd1a239 | 2008-04-28 02:12:17 -0700 | [diff] [blame] | 1200 | case MPOL_BIND: { |
Christoph Lameter | dc85da1 | 2006-01-18 17:42:36 -0800 | [diff] [blame] | 1201 | /* |
| 1202 | * Follow bind policy behavior and start allocation at the |
| 1203 | * first node. |
| 1204 | */ |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1205 | struct zonelist *zonelist; |
| 1206 | struct zone *zone; |
| 1207 | enum zone_type highest_zoneidx = gfp_zone(GFP_KERNEL); |
| 1208 | zonelist = &NODE_DATA(numa_node_id())->node_zonelists[0]; |
| 1209 | (void)first_zones_zonelist(zonelist, highest_zoneidx, |
| 1210 | &policy->v.nodes, |
| 1211 | &zone); |
| 1212 | return zone->node; |
Mel Gorman | dd1a239 | 2008-04-28 02:12:17 -0700 | [diff] [blame] | 1213 | } |
Christoph Lameter | dc85da1 | 2006-01-18 17:42:36 -0800 | [diff] [blame] | 1214 | |
| 1215 | case MPOL_PREFERRED: |
| 1216 | if (policy->v.preferred_node >= 0) |
| 1217 | return policy->v.preferred_node; |
| 1218 | /* Fall through */ |
| 1219 | |
| 1220 | default: |
| 1221 | return numa_node_id(); |
| 1222 | } |
| 1223 | } |
| 1224 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1225 | /* Do static interleaving for a VMA with known offset. */ |
| 1226 | static unsigned offset_il_node(struct mempolicy *pol, |
| 1227 | struct vm_area_struct *vma, unsigned long off) |
| 1228 | { |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 1229 | unsigned nnodes = nodes_weight(pol->v.nodes); |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 1230 | unsigned target; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | int c; |
| 1232 | int nid = -1; |
| 1233 | |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 1234 | if (!nnodes) |
| 1235 | return numa_node_id(); |
| 1236 | target = (unsigned int)off % nnodes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1237 | c = 0; |
| 1238 | do { |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 1239 | nid = next_node(nid, pol->v.nodes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | c++; |
| 1241 | } while (c <= target); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1242 | return nid; |
| 1243 | } |
| 1244 | |
Christoph Lameter | 5da7ca8 | 2006-01-06 00:10:46 -0800 | [diff] [blame] | 1245 | /* Determine a node number for interleave */ |
| 1246 | static inline unsigned interleave_nid(struct mempolicy *pol, |
| 1247 | struct vm_area_struct *vma, unsigned long addr, int shift) |
| 1248 | { |
| 1249 | if (vma) { |
| 1250 | unsigned long off; |
| 1251 | |
Nishanth Aravamudan | 3b98b08 | 2006-08-31 21:27:53 -0700 | [diff] [blame] | 1252 | /* |
| 1253 | * for small pages, there is no difference between |
| 1254 | * shift and PAGE_SHIFT, so the bit-shift is safe. |
| 1255 | * for huge pages, since vm_pgoff is in units of small |
| 1256 | * pages, we need to shift off the always 0 bits to get |
| 1257 | * a useful offset. |
| 1258 | */ |
| 1259 | BUG_ON(shift < PAGE_SHIFT); |
| 1260 | off = vma->vm_pgoff >> (shift - PAGE_SHIFT); |
Christoph Lameter | 5da7ca8 | 2006-01-06 00:10:46 -0800 | [diff] [blame] | 1261 | off += (addr - vma->vm_start) >> shift; |
| 1262 | return offset_il_node(pol, vma, off); |
| 1263 | } else |
| 1264 | return interleave_nodes(pol); |
| 1265 | } |
| 1266 | |
Chen, Kenneth W | 00ac59a | 2006-02-03 21:51:14 +0100 | [diff] [blame] | 1267 | #ifdef CONFIG_HUGETLBFS |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1268 | /* |
| 1269 | * huge_zonelist(@vma, @addr, @gfp_flags, @mpol) |
| 1270 | * @vma = virtual memory area whose policy is sought |
| 1271 | * @addr = address in @vma for shared policy lookup and interleave policy |
| 1272 | * @gfp_flags = for requested zone |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1273 | * @mpol = pointer to mempolicy pointer for reference counted mempolicy |
| 1274 | * @nodemask = pointer to nodemask pointer for MPOL_BIND nodemask |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1275 | * |
| 1276 | * Returns a zonelist suitable for a huge page allocation. |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1277 | * If the effective policy is 'BIND, returns pointer to local node's zonelist, |
| 1278 | * and a pointer to the mempolicy's @nodemask for filtering the zonelist. |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1279 | * If it is also a policy for which get_vma_policy() returns an extra |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1280 | * reference, we must hold that reference until after the allocation. |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1281 | * In that case, return policy via @mpol so hugetlb allocation can drop |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1282 | * the reference. For non-'BIND referenced policies, we can/do drop the |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1283 | * reference here, so the caller doesn't need to know about the special case |
| 1284 | * for default and current task policy. |
| 1285 | */ |
Mel Gorman | 396faf0 | 2007-07-17 04:03:13 -0700 | [diff] [blame] | 1286 | struct zonelist *huge_zonelist(struct vm_area_struct *vma, unsigned long addr, |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1287 | gfp_t gfp_flags, struct mempolicy **mpol, |
| 1288 | nodemask_t **nodemask) |
Christoph Lameter | 5da7ca8 | 2006-01-06 00:10:46 -0800 | [diff] [blame] | 1289 | { |
| 1290 | struct mempolicy *pol = get_vma_policy(current, vma, addr); |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1291 | struct zonelist *zl; |
Christoph Lameter | 5da7ca8 | 2006-01-06 00:10:46 -0800 | [diff] [blame] | 1292 | |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1293 | *mpol = NULL; /* probably no unref needed */ |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1294 | *nodemask = NULL; /* assume !MPOL_BIND */ |
| 1295 | if (pol->policy == MPOL_BIND) { |
| 1296 | *nodemask = &pol->v.nodes; |
| 1297 | } else if (pol->policy == MPOL_INTERLEAVE) { |
Christoph Lameter | 5da7ca8 | 2006-01-06 00:10:46 -0800 | [diff] [blame] | 1298 | unsigned nid; |
| 1299 | |
| 1300 | nid = interleave_nid(pol, vma, addr, HPAGE_SHIFT); |
Lee Schermerhorn | 69682d8 | 2008-03-10 11:43:45 -0700 | [diff] [blame] | 1301 | if (unlikely(pol != &default_policy && |
| 1302 | pol != current->mempolicy)) |
| 1303 | __mpol_free(pol); /* finished with pol */ |
Mel Gorman | 0e88460 | 2008-04-28 02:12:14 -0700 | [diff] [blame] | 1304 | return node_zonelist(nid, gfp_flags); |
Christoph Lameter | 5da7ca8 | 2006-01-06 00:10:46 -0800 | [diff] [blame] | 1305 | } |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1306 | |
| 1307 | zl = zonelist_policy(GFP_HIGHUSER, pol); |
| 1308 | if (unlikely(pol != &default_policy && pol != current->mempolicy)) { |
| 1309 | if (pol->policy != MPOL_BIND) |
| 1310 | __mpol_free(pol); /* finished with pol */ |
| 1311 | else |
| 1312 | *mpol = pol; /* unref needed after allocation */ |
| 1313 | } |
| 1314 | return zl; |
Christoph Lameter | 5da7ca8 | 2006-01-06 00:10:46 -0800 | [diff] [blame] | 1315 | } |
Chen, Kenneth W | 00ac59a | 2006-02-03 21:51:14 +0100 | [diff] [blame] | 1316 | #endif |
Christoph Lameter | 5da7ca8 | 2006-01-06 00:10:46 -0800 | [diff] [blame] | 1317 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1318 | /* Allocate a page in interleaved policy. |
| 1319 | Own path because it needs to do special accounting. */ |
Andi Kleen | 662f3a0 | 2005-10-29 18:15:49 -0700 | [diff] [blame] | 1320 | static struct page *alloc_page_interleave(gfp_t gfp, unsigned order, |
| 1321 | unsigned nid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1322 | { |
| 1323 | struct zonelist *zl; |
| 1324 | struct page *page; |
| 1325 | |
Mel Gorman | 0e88460 | 2008-04-28 02:12:14 -0700 | [diff] [blame] | 1326 | zl = node_zonelist(nid, gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1327 | page = __alloc_pages(gfp, order, zl); |
Mel Gorman | dd1a239 | 2008-04-28 02:12:17 -0700 | [diff] [blame] | 1328 | if (page && page_zone(page) == zonelist_zone(&zl->_zonerefs[0])) |
Christoph Lameter | ca889e6 | 2006-06-30 01:55:44 -0700 | [diff] [blame] | 1329 | inc_zone_page_state(page, NUMA_INTERLEAVE_HIT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1330 | return page; |
| 1331 | } |
| 1332 | |
| 1333 | /** |
| 1334 | * alloc_page_vma - Allocate a page for a VMA. |
| 1335 | * |
| 1336 | * @gfp: |
| 1337 | * %GFP_USER user allocation. |
| 1338 | * %GFP_KERNEL kernel allocations, |
| 1339 | * %GFP_HIGHMEM highmem/user allocations, |
| 1340 | * %GFP_FS allocation should not call back into a file system. |
| 1341 | * %GFP_ATOMIC don't sleep. |
| 1342 | * |
| 1343 | * @vma: Pointer to VMA or NULL if not available. |
| 1344 | * @addr: Virtual Address of the allocation. Must be inside the VMA. |
| 1345 | * |
| 1346 | * This function allocates a page from the kernel page pool and applies |
| 1347 | * a NUMA policy associated with the VMA or the current process. |
| 1348 | * When VMA is not NULL caller must hold down_read on the mmap_sem of the |
| 1349 | * mm_struct of the VMA to prevent it from going away. Should be used for |
| 1350 | * all allocations for pages that will be mapped into |
| 1351 | * user space. Returns NULL when no page can be allocated. |
| 1352 | * |
| 1353 | * Should be called with the mm_sem of the vma hold. |
| 1354 | */ |
| 1355 | struct page * |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1356 | 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] | 1357 | { |
Christoph Lameter | 6e21c8f | 2005-09-03 15:54:45 -0700 | [diff] [blame] | 1358 | struct mempolicy *pol = get_vma_policy(current, vma, addr); |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1359 | struct zonelist *zl; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1360 | |
Paul Jackson | cf2a473 | 2006-01-08 01:01:54 -0800 | [diff] [blame] | 1361 | cpuset_update_task_memory_state(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1362 | |
| 1363 | if (unlikely(pol->policy == MPOL_INTERLEAVE)) { |
| 1364 | unsigned nid; |
Christoph Lameter | 5da7ca8 | 2006-01-06 00:10:46 -0800 | [diff] [blame] | 1365 | |
| 1366 | nid = interleave_nid(pol, vma, addr, PAGE_SHIFT); |
Lee Schermerhorn | 69682d8 | 2008-03-10 11:43:45 -0700 | [diff] [blame] | 1367 | if (unlikely(pol != &default_policy && |
| 1368 | pol != current->mempolicy)) |
| 1369 | __mpol_free(pol); /* finished with pol */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1370 | return alloc_page_interleave(gfp, 0, nid); |
| 1371 | } |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1372 | zl = zonelist_policy(gfp, pol); |
| 1373 | if (pol != &default_policy && pol != current->mempolicy) { |
| 1374 | /* |
| 1375 | * slow path: ref counted policy -- shared or vma |
| 1376 | */ |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1377 | struct page *page = __alloc_pages_nodemask(gfp, 0, |
| 1378 | zl, nodemask_policy(gfp, pol)); |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 1379 | __mpol_free(pol); |
| 1380 | return page; |
| 1381 | } |
| 1382 | /* |
| 1383 | * fast path: default or task policy |
| 1384 | */ |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1385 | return __alloc_pages_nodemask(gfp, 0, zl, nodemask_policy(gfp, pol)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1386 | } |
| 1387 | |
| 1388 | /** |
| 1389 | * alloc_pages_current - Allocate pages. |
| 1390 | * |
| 1391 | * @gfp: |
| 1392 | * %GFP_USER user allocation, |
| 1393 | * %GFP_KERNEL kernel allocation, |
| 1394 | * %GFP_HIGHMEM highmem allocation, |
| 1395 | * %GFP_FS don't call back into a file system. |
| 1396 | * %GFP_ATOMIC don't sleep. |
| 1397 | * @order: Power of two of allocation size in pages. 0 is a single page. |
| 1398 | * |
| 1399 | * Allocate a page from the kernel page pool. When not in |
| 1400 | * interrupt context and apply the current process NUMA policy. |
| 1401 | * Returns NULL when no page can be allocated. |
| 1402 | * |
Paul Jackson | cf2a473 | 2006-01-08 01:01:54 -0800 | [diff] [blame] | 1403 | * Don't call cpuset_update_task_memory_state() unless |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1404 | * 1) it's ok to take cpuset_sem (can WAIT), and |
| 1405 | * 2) allocating for current task (not interrupt). |
| 1406 | */ |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1407 | struct page *alloc_pages_current(gfp_t gfp, unsigned order) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1408 | { |
| 1409 | struct mempolicy *pol = current->mempolicy; |
| 1410 | |
| 1411 | if ((gfp & __GFP_WAIT) && !in_interrupt()) |
Paul Jackson | cf2a473 | 2006-01-08 01:01:54 -0800 | [diff] [blame] | 1412 | cpuset_update_task_memory_state(); |
Christoph Lameter | 9b819d2 | 2006-09-25 23:31:40 -0700 | [diff] [blame] | 1413 | if (!pol || in_interrupt() || (gfp & __GFP_THISNODE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1414 | pol = &default_policy; |
| 1415 | if (pol->policy == MPOL_INTERLEAVE) |
| 1416 | return alloc_page_interleave(gfp, order, interleave_nodes(pol)); |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1417 | return __alloc_pages_nodemask(gfp, order, |
| 1418 | zonelist_policy(gfp, pol), nodemask_policy(gfp, pol)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1419 | } |
| 1420 | EXPORT_SYMBOL(alloc_pages_current); |
| 1421 | |
Paul Jackson | 4225399 | 2006-01-08 01:01:59 -0800 | [diff] [blame] | 1422 | /* |
| 1423 | * If mpol_copy() sees current->cpuset == cpuset_being_rebound, then it |
| 1424 | * rebinds the mempolicy its copying by calling mpol_rebind_policy() |
| 1425 | * with the mems_allowed returned by cpuset_mems_allowed(). This |
| 1426 | * keeps mempolicies cpuset relative after its cpuset moves. See |
| 1427 | * further kernel/cpuset.c update_nodemask(). |
| 1428 | */ |
Paul Jackson | 4225399 | 2006-01-08 01:01:59 -0800 | [diff] [blame] | 1429 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1430 | /* Slow path of a mempolicy copy */ |
| 1431 | struct mempolicy *__mpol_copy(struct mempolicy *old) |
| 1432 | { |
| 1433 | struct mempolicy *new = kmem_cache_alloc(policy_cache, GFP_KERNEL); |
| 1434 | |
| 1435 | if (!new) |
| 1436 | return ERR_PTR(-ENOMEM); |
Paul Jackson | 4225399 | 2006-01-08 01:01:59 -0800 | [diff] [blame] | 1437 | if (current_cpuset_is_being_rebound()) { |
| 1438 | nodemask_t mems = cpuset_mems_allowed(current); |
| 1439 | mpol_rebind_policy(old, &mems); |
| 1440 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1441 | *new = *old; |
| 1442 | atomic_set(&new->refcnt, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1443 | return new; |
| 1444 | } |
| 1445 | |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 1446 | static int mpol_match_intent(const struct mempolicy *a, |
| 1447 | const struct mempolicy *b) |
| 1448 | { |
| 1449 | if (a->flags != b->flags) |
| 1450 | return 0; |
| 1451 | if (!mpol_store_user_nodemask(a)) |
| 1452 | return 1; |
| 1453 | return nodes_equal(a->w.user_nodemask, b->w.user_nodemask); |
| 1454 | } |
| 1455 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1456 | /* Slow path of a mempolicy comparison */ |
| 1457 | int __mpol_equal(struct mempolicy *a, struct mempolicy *b) |
| 1458 | { |
| 1459 | if (!a || !b) |
| 1460 | return 0; |
| 1461 | if (a->policy != b->policy) |
| 1462 | return 0; |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 1463 | if (a->policy != MPOL_DEFAULT && !mpol_match_intent(a, b)) |
| 1464 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1465 | switch (a->policy) { |
| 1466 | case MPOL_DEFAULT: |
| 1467 | return 1; |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1468 | case MPOL_BIND: |
| 1469 | /* Fall through */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1470 | case MPOL_INTERLEAVE: |
Andi Kleen | dfcd3c0 | 2005-10-29 18:15:48 -0700 | [diff] [blame] | 1471 | return nodes_equal(a->v.nodes, b->v.nodes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1472 | case MPOL_PREFERRED: |
| 1473 | return a->v.preferred_node == b->v.preferred_node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1474 | default: |
| 1475 | BUG(); |
| 1476 | return 0; |
| 1477 | } |
| 1478 | } |
| 1479 | |
| 1480 | /* Slow path of a mpol destructor. */ |
| 1481 | void __mpol_free(struct mempolicy *p) |
| 1482 | { |
| 1483 | if (!atomic_dec_and_test(&p->refcnt)) |
| 1484 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1485 | p->policy = MPOL_DEFAULT; |
| 1486 | kmem_cache_free(policy_cache, p); |
| 1487 | } |
| 1488 | |
| 1489 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1490 | * Shared memory backing store policy support. |
| 1491 | * |
| 1492 | * Remember policies even when nobody has shared memory mapped. |
| 1493 | * The policies are kept in Red-Black tree linked from the inode. |
| 1494 | * They are protected by the sp->lock spinlock, which should be held |
| 1495 | * for any accesses to the tree. |
| 1496 | */ |
| 1497 | |
| 1498 | /* lookup first element intersecting start-end */ |
| 1499 | /* Caller holds sp->lock */ |
| 1500 | static struct sp_node * |
| 1501 | sp_lookup(struct shared_policy *sp, unsigned long start, unsigned long end) |
| 1502 | { |
| 1503 | struct rb_node *n = sp->root.rb_node; |
| 1504 | |
| 1505 | while (n) { |
| 1506 | struct sp_node *p = rb_entry(n, struct sp_node, nd); |
| 1507 | |
| 1508 | if (start >= p->end) |
| 1509 | n = n->rb_right; |
| 1510 | else if (end <= p->start) |
| 1511 | n = n->rb_left; |
| 1512 | else |
| 1513 | break; |
| 1514 | } |
| 1515 | if (!n) |
| 1516 | return NULL; |
| 1517 | for (;;) { |
| 1518 | struct sp_node *w = NULL; |
| 1519 | struct rb_node *prev = rb_prev(n); |
| 1520 | if (!prev) |
| 1521 | break; |
| 1522 | w = rb_entry(prev, struct sp_node, nd); |
| 1523 | if (w->end <= start) |
| 1524 | break; |
| 1525 | n = prev; |
| 1526 | } |
| 1527 | return rb_entry(n, struct sp_node, nd); |
| 1528 | } |
| 1529 | |
| 1530 | /* Insert a new shared policy into the list. */ |
| 1531 | /* Caller holds sp->lock */ |
| 1532 | static void sp_insert(struct shared_policy *sp, struct sp_node *new) |
| 1533 | { |
| 1534 | struct rb_node **p = &sp->root.rb_node; |
| 1535 | struct rb_node *parent = NULL; |
| 1536 | struct sp_node *nd; |
| 1537 | |
| 1538 | while (*p) { |
| 1539 | parent = *p; |
| 1540 | nd = rb_entry(parent, struct sp_node, nd); |
| 1541 | if (new->start < nd->start) |
| 1542 | p = &(*p)->rb_left; |
| 1543 | else if (new->end > nd->end) |
| 1544 | p = &(*p)->rb_right; |
| 1545 | else |
| 1546 | BUG(); |
| 1547 | } |
| 1548 | rb_link_node(&new->nd, parent, p); |
| 1549 | rb_insert_color(&new->nd, &sp->root); |
Paul Mundt | 140d5a4 | 2007-07-15 23:38:16 -0700 | [diff] [blame] | 1550 | pr_debug("inserting %lx-%lx: %d\n", new->start, new->end, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1551 | new->policy ? new->policy->policy : 0); |
| 1552 | } |
| 1553 | |
| 1554 | /* Find shared policy intersecting idx */ |
| 1555 | struct mempolicy * |
| 1556 | mpol_shared_policy_lookup(struct shared_policy *sp, unsigned long idx) |
| 1557 | { |
| 1558 | struct mempolicy *pol = NULL; |
| 1559 | struct sp_node *sn; |
| 1560 | |
| 1561 | if (!sp->root.rb_node) |
| 1562 | return NULL; |
| 1563 | spin_lock(&sp->lock); |
| 1564 | sn = sp_lookup(sp, idx, idx+1); |
| 1565 | if (sn) { |
| 1566 | mpol_get(sn->policy); |
| 1567 | pol = sn->policy; |
| 1568 | } |
| 1569 | spin_unlock(&sp->lock); |
| 1570 | return pol; |
| 1571 | } |
| 1572 | |
| 1573 | static void sp_delete(struct shared_policy *sp, struct sp_node *n) |
| 1574 | { |
Paul Mundt | 140d5a4 | 2007-07-15 23:38:16 -0700 | [diff] [blame] | 1575 | pr_debug("deleting %lx-l%lx\n", n->start, n->end); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1576 | rb_erase(&n->nd, &sp->root); |
| 1577 | mpol_free(n->policy); |
| 1578 | kmem_cache_free(sn_cache, n); |
| 1579 | } |
| 1580 | |
Adrian Bunk | dbcb0f1 | 2007-10-16 01:26:26 -0700 | [diff] [blame] | 1581 | static struct sp_node *sp_alloc(unsigned long start, unsigned long end, |
| 1582 | struct mempolicy *pol) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1583 | { |
| 1584 | struct sp_node *n = kmem_cache_alloc(sn_cache, GFP_KERNEL); |
| 1585 | |
| 1586 | if (!n) |
| 1587 | return NULL; |
| 1588 | n->start = start; |
| 1589 | n->end = end; |
| 1590 | mpol_get(pol); |
| 1591 | n->policy = pol; |
| 1592 | return n; |
| 1593 | } |
| 1594 | |
| 1595 | /* Replace a policy range. */ |
| 1596 | static int shared_policy_replace(struct shared_policy *sp, unsigned long start, |
| 1597 | unsigned long end, struct sp_node *new) |
| 1598 | { |
| 1599 | struct sp_node *n, *new2 = NULL; |
| 1600 | |
| 1601 | restart: |
| 1602 | spin_lock(&sp->lock); |
| 1603 | n = sp_lookup(sp, start, end); |
| 1604 | /* Take care of old policies in the same range. */ |
| 1605 | while (n && n->start < end) { |
| 1606 | struct rb_node *next = rb_next(&n->nd); |
| 1607 | if (n->start >= start) { |
| 1608 | if (n->end <= end) |
| 1609 | sp_delete(sp, n); |
| 1610 | else |
| 1611 | n->start = end; |
| 1612 | } else { |
| 1613 | /* Old policy spanning whole new range. */ |
| 1614 | if (n->end > end) { |
| 1615 | if (!new2) { |
| 1616 | spin_unlock(&sp->lock); |
| 1617 | new2 = sp_alloc(end, n->end, n->policy); |
| 1618 | if (!new2) |
| 1619 | return -ENOMEM; |
| 1620 | goto restart; |
| 1621 | } |
| 1622 | n->end = start; |
| 1623 | sp_insert(sp, new2); |
| 1624 | new2 = NULL; |
| 1625 | break; |
| 1626 | } else |
| 1627 | n->end = start; |
| 1628 | } |
| 1629 | if (!next) |
| 1630 | break; |
| 1631 | n = rb_entry(next, struct sp_node, nd); |
| 1632 | } |
| 1633 | if (new) |
| 1634 | sp_insert(sp, new); |
| 1635 | spin_unlock(&sp->lock); |
| 1636 | if (new2) { |
| 1637 | mpol_free(new2->policy); |
| 1638 | kmem_cache_free(sn_cache, new2); |
| 1639 | } |
| 1640 | return 0; |
| 1641 | } |
| 1642 | |
David Rientjes | a3b51e0 | 2008-04-28 02:12:23 -0700 | [diff] [blame] | 1643 | void mpol_shared_policy_init(struct shared_policy *info, unsigned short policy, |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 1644 | unsigned short flags, nodemask_t *policy_nodes) |
Robin Holt | 7339ff8 | 2006-01-14 13:20:48 -0800 | [diff] [blame] | 1645 | { |
| 1646 | info->root = RB_ROOT; |
| 1647 | spin_lock_init(&info->lock); |
| 1648 | |
| 1649 | if (policy != MPOL_DEFAULT) { |
| 1650 | struct mempolicy *newpol; |
| 1651 | |
| 1652 | /* Falls back to MPOL_DEFAULT on any error */ |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 1653 | newpol = mpol_new(policy, flags, policy_nodes); |
Robin Holt | 7339ff8 | 2006-01-14 13:20:48 -0800 | [diff] [blame] | 1654 | if (!IS_ERR(newpol)) { |
| 1655 | /* Create pseudo-vma that contains just the policy */ |
| 1656 | struct vm_area_struct pvma; |
| 1657 | |
| 1658 | memset(&pvma, 0, sizeof(struct vm_area_struct)); |
| 1659 | /* Policy covers entire file */ |
| 1660 | pvma.vm_end = TASK_SIZE; |
| 1661 | mpol_set_shared_policy(info, &pvma, newpol); |
| 1662 | mpol_free(newpol); |
| 1663 | } |
| 1664 | } |
| 1665 | } |
| 1666 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1667 | int mpol_set_shared_policy(struct shared_policy *info, |
| 1668 | struct vm_area_struct *vma, struct mempolicy *npol) |
| 1669 | { |
| 1670 | int err; |
| 1671 | struct sp_node *new = NULL; |
| 1672 | unsigned long sz = vma_pages(vma); |
| 1673 | |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 1674 | pr_debug("set_shared_policy %lx sz %lu %d %d %lx\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1675 | vma->vm_pgoff, |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 1676 | sz, npol ? npol->policy : -1, |
| 1677 | npol ? npol->flags : -1, |
Paul Mundt | 140d5a4 | 2007-07-15 23:38:16 -0700 | [diff] [blame] | 1678 | npol ? nodes_addr(npol->v.nodes)[0] : -1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1679 | |
| 1680 | if (npol) { |
| 1681 | new = sp_alloc(vma->vm_pgoff, vma->vm_pgoff + sz, npol); |
| 1682 | if (!new) |
| 1683 | return -ENOMEM; |
| 1684 | } |
| 1685 | err = shared_policy_replace(info, vma->vm_pgoff, vma->vm_pgoff+sz, new); |
| 1686 | if (err && new) |
| 1687 | kmem_cache_free(sn_cache, new); |
| 1688 | return err; |
| 1689 | } |
| 1690 | |
| 1691 | /* Free a backing policy store on inode delete. */ |
| 1692 | void mpol_free_shared_policy(struct shared_policy *p) |
| 1693 | { |
| 1694 | struct sp_node *n; |
| 1695 | struct rb_node *next; |
| 1696 | |
| 1697 | if (!p->root.rb_node) |
| 1698 | return; |
| 1699 | spin_lock(&p->lock); |
| 1700 | next = rb_first(&p->root); |
| 1701 | while (next) { |
| 1702 | n = rb_entry(next, struct sp_node, nd); |
| 1703 | next = rb_next(&n->nd); |
Andi Kleen | 90c5029 | 2005-07-27 11:43:50 -0700 | [diff] [blame] | 1704 | rb_erase(&n->nd, &p->root); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1705 | mpol_free(n->policy); |
| 1706 | kmem_cache_free(sn_cache, n); |
| 1707 | } |
| 1708 | spin_unlock(&p->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1709 | } |
| 1710 | |
| 1711 | /* assumes fs == KERNEL_DS */ |
| 1712 | void __init numa_policy_init(void) |
| 1713 | { |
Paul Mundt | b71636e | 2007-07-15 23:38:15 -0700 | [diff] [blame] | 1714 | nodemask_t interleave_nodes; |
| 1715 | unsigned long largest = 0; |
| 1716 | int nid, prefer = 0; |
| 1717 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1718 | policy_cache = kmem_cache_create("numa_policy", |
| 1719 | sizeof(struct mempolicy), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1720 | 0, SLAB_PANIC, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1721 | |
| 1722 | sn_cache = kmem_cache_create("shared_policy_node", |
| 1723 | sizeof(struct sp_node), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1724 | 0, SLAB_PANIC, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1725 | |
Paul Mundt | b71636e | 2007-07-15 23:38:15 -0700 | [diff] [blame] | 1726 | /* |
| 1727 | * Set interleaving policy for system init. Interleaving is only |
| 1728 | * enabled across suitably sized nodes (default is >= 16MB), or |
| 1729 | * fall back to the largest node if they're all smaller. |
| 1730 | */ |
| 1731 | nodes_clear(interleave_nodes); |
Christoph Lameter | 56bbd65 | 2007-10-16 01:25:35 -0700 | [diff] [blame] | 1732 | for_each_node_state(nid, N_HIGH_MEMORY) { |
Paul Mundt | b71636e | 2007-07-15 23:38:15 -0700 | [diff] [blame] | 1733 | unsigned long total_pages = node_present_pages(nid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1734 | |
Paul Mundt | b71636e | 2007-07-15 23:38:15 -0700 | [diff] [blame] | 1735 | /* Preserve the largest node */ |
| 1736 | if (largest < total_pages) { |
| 1737 | largest = total_pages; |
| 1738 | prefer = nid; |
| 1739 | } |
| 1740 | |
| 1741 | /* Interleave this node? */ |
| 1742 | if ((total_pages << PAGE_SHIFT) >= (16 << 20)) |
| 1743 | node_set(nid, interleave_nodes); |
| 1744 | } |
| 1745 | |
| 1746 | /* All too small, use the largest */ |
| 1747 | if (unlikely(nodes_empty(interleave_nodes))) |
| 1748 | node_set(prefer, interleave_nodes); |
| 1749 | |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 1750 | if (do_set_mempolicy(MPOL_INTERLEAVE, 0, &interleave_nodes)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1751 | printk("numa_policy_init: interleaving failed\n"); |
| 1752 | } |
| 1753 | |
Christoph Lameter | 8bccd85 | 2005-10-29 18:16:59 -0700 | [diff] [blame] | 1754 | /* Reset policy of current process to default */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1755 | void numa_default_policy(void) |
| 1756 | { |
David Rientjes | 028fec4 | 2008-04-28 02:12:25 -0700 | [diff] [blame] | 1757 | do_set_mempolicy(MPOL_DEFAULT, 0, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1758 | } |
Paul Jackson | 68860ec | 2005-10-30 15:02:36 -0800 | [diff] [blame] | 1759 | |
| 1760 | /* Migrate a policy to a different set of nodes */ |
Adrian Bunk | dbcb0f1 | 2007-10-16 01:26:26 -0700 | [diff] [blame] | 1761 | static void mpol_rebind_policy(struct mempolicy *pol, |
| 1762 | const nodemask_t *newmask) |
Paul Jackson | 68860ec | 2005-10-30 15:02:36 -0800 | [diff] [blame] | 1763 | { |
| 1764 | nodemask_t tmp; |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 1765 | int static_nodes; |
David Rientjes | 4c50bc0 | 2008-04-28 02:12:30 -0700 | [diff] [blame^] | 1766 | int relative_nodes; |
Paul Jackson | 68860ec | 2005-10-30 15:02:36 -0800 | [diff] [blame] | 1767 | |
| 1768 | if (!pol) |
| 1769 | return; |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 1770 | static_nodes = pol->flags & MPOL_F_STATIC_NODES; |
David Rientjes | 4c50bc0 | 2008-04-28 02:12:30 -0700 | [diff] [blame^] | 1771 | relative_nodes = pol->flags & MPOL_F_RELATIVE_NODES; |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 1772 | if (!mpol_store_user_nodemask(pol) && |
| 1773 | nodes_equal(pol->w.cpuset_mems_allowed, *newmask)) |
Paul Jackson | 74cb215 | 2006-01-08 01:01:56 -0800 | [diff] [blame] | 1774 | return; |
Paul Jackson | 68860ec | 2005-10-30 15:02:36 -0800 | [diff] [blame] | 1775 | |
| 1776 | switch (pol->policy) { |
| 1777 | case MPOL_DEFAULT: |
| 1778 | break; |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1779 | case MPOL_BIND: |
| 1780 | /* Fall through */ |
Paul Jackson | 68860ec | 2005-10-30 15:02:36 -0800 | [diff] [blame] | 1781 | case MPOL_INTERLEAVE: |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 1782 | if (static_nodes) |
| 1783 | nodes_and(tmp, pol->w.user_nodemask, *newmask); |
David Rientjes | 4c50bc0 | 2008-04-28 02:12:30 -0700 | [diff] [blame^] | 1784 | else if (relative_nodes) |
| 1785 | mpol_relative_nodemask(&tmp, &pol->w.user_nodemask, |
| 1786 | newmask); |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 1787 | else { |
| 1788 | nodes_remap(tmp, pol->v.nodes, |
| 1789 | pol->w.cpuset_mems_allowed, *newmask); |
| 1790 | pol->w.cpuset_mems_allowed = *newmask; |
| 1791 | } |
Paul Jackson | 68860ec | 2005-10-30 15:02:36 -0800 | [diff] [blame] | 1792 | pol->v.nodes = tmp; |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 1793 | if (!node_isset(current->il_next, tmp)) { |
| 1794 | current->il_next = next_node(current->il_next, tmp); |
| 1795 | if (current->il_next >= MAX_NUMNODES) |
| 1796 | current->il_next = first_node(tmp); |
| 1797 | if (current->il_next >= MAX_NUMNODES) |
| 1798 | current->il_next = numa_node_id(); |
| 1799 | } |
Paul Jackson | 68860ec | 2005-10-30 15:02:36 -0800 | [diff] [blame] | 1800 | break; |
| 1801 | case MPOL_PREFERRED: |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 1802 | if (static_nodes) { |
| 1803 | int node = first_node(pol->w.user_nodemask); |
| 1804 | |
| 1805 | if (node_isset(node, *newmask)) |
| 1806 | pol->v.preferred_node = node; |
| 1807 | else |
| 1808 | pol->v.preferred_node = -1; |
David Rientjes | 4c50bc0 | 2008-04-28 02:12:30 -0700 | [diff] [blame^] | 1809 | } else if (relative_nodes) { |
| 1810 | mpol_relative_nodemask(&tmp, &pol->w.user_nodemask, |
| 1811 | newmask); |
| 1812 | pol->v.preferred_node = first_node(tmp); |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 1813 | } else { |
| 1814 | pol->v.preferred_node = node_remap(pol->v.preferred_node, |
| 1815 | pol->w.cpuset_mems_allowed, *newmask); |
| 1816 | pol->w.cpuset_mems_allowed = *newmask; |
| 1817 | } |
Paul Jackson | 68860ec | 2005-10-30 15:02:36 -0800 | [diff] [blame] | 1818 | break; |
Paul Jackson | 68860ec | 2005-10-30 15:02:36 -0800 | [diff] [blame] | 1819 | default: |
| 1820 | BUG(); |
| 1821 | break; |
| 1822 | } |
| 1823 | } |
| 1824 | |
| 1825 | /* |
Paul Jackson | 74cb215 | 2006-01-08 01:01:56 -0800 | [diff] [blame] | 1826 | * Wrapper for mpol_rebind_policy() that just requires task |
| 1827 | * pointer, and updates task mempolicy. |
Paul Jackson | 68860ec | 2005-10-30 15:02:36 -0800 | [diff] [blame] | 1828 | */ |
Paul Jackson | 74cb215 | 2006-01-08 01:01:56 -0800 | [diff] [blame] | 1829 | |
| 1830 | void mpol_rebind_task(struct task_struct *tsk, const nodemask_t *new) |
Paul Jackson | 68860ec | 2005-10-30 15:02:36 -0800 | [diff] [blame] | 1831 | { |
Paul Jackson | 74cb215 | 2006-01-08 01:01:56 -0800 | [diff] [blame] | 1832 | mpol_rebind_policy(tsk->mempolicy, new); |
Paul Jackson | 68860ec | 2005-10-30 15:02:36 -0800 | [diff] [blame] | 1833 | } |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 1834 | |
| 1835 | /* |
Paul Jackson | 4225399 | 2006-01-08 01:01:59 -0800 | [diff] [blame] | 1836 | * Rebind each vma in mm to new nodemask. |
| 1837 | * |
| 1838 | * Call holding a reference to mm. Takes mm->mmap_sem during call. |
| 1839 | */ |
| 1840 | |
| 1841 | void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new) |
| 1842 | { |
| 1843 | struct vm_area_struct *vma; |
| 1844 | |
| 1845 | down_write(&mm->mmap_sem); |
| 1846 | for (vma = mm->mmap; vma; vma = vma->vm_next) |
| 1847 | mpol_rebind_policy(vma->vm_policy, new); |
| 1848 | up_write(&mm->mmap_sem); |
| 1849 | } |
| 1850 | |
| 1851 | /* |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 1852 | * Display pages allocated per node and memory policy via /proc. |
| 1853 | */ |
| 1854 | |
Helge Deller | 15ad7cd | 2006-12-06 20:40:36 -0800 | [diff] [blame] | 1855 | static const char * const policy_types[] = |
| 1856 | { "default", "prefer", "bind", "interleave" }; |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 1857 | |
| 1858 | /* |
| 1859 | * Convert a mempolicy into a string. |
| 1860 | * Returns the number of characters in buffer (if positive) |
| 1861 | * or an error (negative) |
| 1862 | */ |
| 1863 | static inline int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol) |
| 1864 | { |
| 1865 | char *p = buffer; |
| 1866 | int l; |
| 1867 | nodemask_t nodes; |
David Rientjes | a3b51e0 | 2008-04-28 02:12:23 -0700 | [diff] [blame] | 1868 | unsigned short mode = pol ? pol->policy : MPOL_DEFAULT; |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 1869 | unsigned short flags = pol ? pol->flags : 0; |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 1870 | |
| 1871 | switch (mode) { |
| 1872 | case MPOL_DEFAULT: |
| 1873 | nodes_clear(nodes); |
| 1874 | break; |
| 1875 | |
| 1876 | case MPOL_PREFERRED: |
| 1877 | nodes_clear(nodes); |
| 1878 | node_set(pol->v.preferred_node, nodes); |
| 1879 | break; |
| 1880 | |
| 1881 | case MPOL_BIND: |
Mel Gorman | 19770b3 | 2008-04-28 02:12:18 -0700 | [diff] [blame] | 1882 | /* Fall through */ |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 1883 | case MPOL_INTERLEAVE: |
| 1884 | nodes = pol->v.nodes; |
| 1885 | break; |
| 1886 | |
| 1887 | default: |
| 1888 | BUG(); |
| 1889 | return -EFAULT; |
| 1890 | } |
| 1891 | |
| 1892 | l = strlen(policy_types[mode]); |
| 1893 | if (buffer + maxlen < p + l + 1) |
| 1894 | return -ENOSPC; |
| 1895 | |
| 1896 | strcpy(p, policy_types[mode]); |
| 1897 | p += l; |
| 1898 | |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 1899 | if (flags) { |
| 1900 | int need_bar = 0; |
| 1901 | |
| 1902 | if (buffer + maxlen < p + 2) |
| 1903 | return -ENOSPC; |
| 1904 | *p++ = '='; |
| 1905 | |
| 1906 | if (flags & MPOL_F_STATIC_NODES) |
| 1907 | p += sprintf(p, "%sstatic", need_bar++ ? "|" : ""); |
David Rientjes | 4c50bc0 | 2008-04-28 02:12:30 -0700 | [diff] [blame^] | 1908 | if (flags & MPOL_F_RELATIVE_NODES) |
| 1909 | p += sprintf(p, "%srelative", need_bar++ ? "|" : ""); |
David Rientjes | f5b087b | 2008-04-28 02:12:27 -0700 | [diff] [blame] | 1910 | } |
| 1911 | |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 1912 | if (!nodes_empty(nodes)) { |
| 1913 | if (buffer + maxlen < p + 2) |
| 1914 | return -ENOSPC; |
| 1915 | *p++ = '='; |
| 1916 | p += nodelist_scnprintf(p, buffer + maxlen - p, nodes); |
| 1917 | } |
| 1918 | return p - buffer; |
| 1919 | } |
| 1920 | |
| 1921 | struct numa_maps { |
| 1922 | unsigned long pages; |
| 1923 | unsigned long anon; |
Christoph Lameter | 397874d | 2006-03-06 15:42:53 -0800 | [diff] [blame] | 1924 | unsigned long active; |
| 1925 | unsigned long writeback; |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 1926 | unsigned long mapcount_max; |
Christoph Lameter | 397874d | 2006-03-06 15:42:53 -0800 | [diff] [blame] | 1927 | unsigned long dirty; |
| 1928 | unsigned long swapcache; |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 1929 | unsigned long node[MAX_NUMNODES]; |
| 1930 | }; |
| 1931 | |
Christoph Lameter | 397874d | 2006-03-06 15:42:53 -0800 | [diff] [blame] | 1932 | static void gather_stats(struct page *page, void *private, int pte_dirty) |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 1933 | { |
| 1934 | struct numa_maps *md = private; |
| 1935 | int count = page_mapcount(page); |
| 1936 | |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 1937 | md->pages++; |
Christoph Lameter | 397874d | 2006-03-06 15:42:53 -0800 | [diff] [blame] | 1938 | if (pte_dirty || PageDirty(page)) |
| 1939 | md->dirty++; |
| 1940 | |
| 1941 | if (PageSwapCache(page)) |
| 1942 | md->swapcache++; |
| 1943 | |
| 1944 | if (PageActive(page)) |
| 1945 | md->active++; |
| 1946 | |
| 1947 | if (PageWriteback(page)) |
| 1948 | md->writeback++; |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 1949 | |
| 1950 | if (PageAnon(page)) |
| 1951 | md->anon++; |
| 1952 | |
Christoph Lameter | 397874d | 2006-03-06 15:42:53 -0800 | [diff] [blame] | 1953 | if (count > md->mapcount_max) |
| 1954 | md->mapcount_max = count; |
| 1955 | |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 1956 | md->node[page_to_nid(page)]++; |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 1957 | } |
| 1958 | |
Andrew Morton | 7f709ed | 2006-03-07 21:55:22 -0800 | [diff] [blame] | 1959 | #ifdef CONFIG_HUGETLB_PAGE |
Christoph Lameter | 397874d | 2006-03-06 15:42:53 -0800 | [diff] [blame] | 1960 | static void check_huge_range(struct vm_area_struct *vma, |
| 1961 | unsigned long start, unsigned long end, |
| 1962 | struct numa_maps *md) |
| 1963 | { |
| 1964 | unsigned long addr; |
| 1965 | struct page *page; |
| 1966 | |
| 1967 | for (addr = start; addr < end; addr += HPAGE_SIZE) { |
| 1968 | pte_t *ptep = huge_pte_offset(vma->vm_mm, addr & HPAGE_MASK); |
| 1969 | pte_t pte; |
| 1970 | |
| 1971 | if (!ptep) |
| 1972 | continue; |
| 1973 | |
| 1974 | pte = *ptep; |
| 1975 | if (pte_none(pte)) |
| 1976 | continue; |
| 1977 | |
| 1978 | page = pte_page(pte); |
| 1979 | if (!page) |
| 1980 | continue; |
| 1981 | |
| 1982 | gather_stats(page, md, pte_dirty(*ptep)); |
| 1983 | } |
| 1984 | } |
Andrew Morton | 7f709ed | 2006-03-07 21:55:22 -0800 | [diff] [blame] | 1985 | #else |
| 1986 | static inline void check_huge_range(struct vm_area_struct *vma, |
| 1987 | unsigned long start, unsigned long end, |
| 1988 | struct numa_maps *md) |
| 1989 | { |
| 1990 | } |
| 1991 | #endif |
Christoph Lameter | 397874d | 2006-03-06 15:42:53 -0800 | [diff] [blame] | 1992 | |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 1993 | int show_numa_map(struct seq_file *m, void *v) |
| 1994 | { |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1995 | struct proc_maps_private *priv = m->private; |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 1996 | struct vm_area_struct *vma = v; |
| 1997 | struct numa_maps *md; |
Christoph Lameter | 397874d | 2006-03-06 15:42:53 -0800 | [diff] [blame] | 1998 | struct file *file = vma->vm_file; |
| 1999 | struct mm_struct *mm = vma->vm_mm; |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 2000 | struct mempolicy *pol; |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2001 | int n; |
| 2002 | char buffer[50]; |
| 2003 | |
Christoph Lameter | 397874d | 2006-03-06 15:42:53 -0800 | [diff] [blame] | 2004 | if (!mm) |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2005 | return 0; |
| 2006 | |
| 2007 | md = kzalloc(sizeof(struct numa_maps), GFP_KERNEL); |
| 2008 | if (!md) |
| 2009 | return 0; |
| 2010 | |
Lee Schermerhorn | 480eccf | 2007-09-18 22:46:47 -0700 | [diff] [blame] | 2011 | pol = get_vma_policy(priv->task, vma, vma->vm_start); |
| 2012 | mpol_to_str(buffer, sizeof(buffer), pol); |
| 2013 | /* |
| 2014 | * unref shared or other task's mempolicy |
| 2015 | */ |
| 2016 | if (pol != &default_policy && pol != current->mempolicy) |
| 2017 | __mpol_free(pol); |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2018 | |
Christoph Lameter | 397874d | 2006-03-06 15:42:53 -0800 | [diff] [blame] | 2019 | seq_printf(m, "%08lx %s", vma->vm_start, buffer); |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2020 | |
Christoph Lameter | 397874d | 2006-03-06 15:42:53 -0800 | [diff] [blame] | 2021 | if (file) { |
| 2022 | seq_printf(m, " file="); |
Jan Blunck | c32c2f6 | 2008-02-14 19:38:43 -0800 | [diff] [blame] | 2023 | seq_path(m, &file->f_path, "\n\t= "); |
Christoph Lameter | 397874d | 2006-03-06 15:42:53 -0800 | [diff] [blame] | 2024 | } else if (vma->vm_start <= mm->brk && vma->vm_end >= mm->start_brk) { |
| 2025 | seq_printf(m, " heap"); |
| 2026 | } else if (vma->vm_start <= mm->start_stack && |
| 2027 | vma->vm_end >= mm->start_stack) { |
| 2028 | seq_printf(m, " stack"); |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2029 | } |
Christoph Lameter | 397874d | 2006-03-06 15:42:53 -0800 | [diff] [blame] | 2030 | |
| 2031 | if (is_vm_hugetlb_page(vma)) { |
| 2032 | check_huge_range(vma, vma->vm_start, vma->vm_end, md); |
| 2033 | seq_printf(m, " huge"); |
| 2034 | } else { |
| 2035 | check_pgd_range(vma, vma->vm_start, vma->vm_end, |
Christoph Lameter | 56bbd65 | 2007-10-16 01:25:35 -0700 | [diff] [blame] | 2036 | &node_states[N_HIGH_MEMORY], MPOL_MF_STATS, md); |
Christoph Lameter | 397874d | 2006-03-06 15:42:53 -0800 | [diff] [blame] | 2037 | } |
| 2038 | |
| 2039 | if (!md->pages) |
| 2040 | goto out; |
| 2041 | |
| 2042 | if (md->anon) |
| 2043 | seq_printf(m," anon=%lu",md->anon); |
| 2044 | |
| 2045 | if (md->dirty) |
| 2046 | seq_printf(m," dirty=%lu",md->dirty); |
| 2047 | |
| 2048 | if (md->pages != md->anon && md->pages != md->dirty) |
| 2049 | seq_printf(m, " mapped=%lu", md->pages); |
| 2050 | |
| 2051 | if (md->mapcount_max > 1) |
| 2052 | seq_printf(m, " mapmax=%lu", md->mapcount_max); |
| 2053 | |
| 2054 | if (md->swapcache) |
| 2055 | seq_printf(m," swapcache=%lu", md->swapcache); |
| 2056 | |
| 2057 | if (md->active < md->pages && !is_vm_hugetlb_page(vma)) |
| 2058 | seq_printf(m," active=%lu", md->active); |
| 2059 | |
| 2060 | if (md->writeback) |
| 2061 | seq_printf(m," writeback=%lu", md->writeback); |
| 2062 | |
Christoph Lameter | 56bbd65 | 2007-10-16 01:25:35 -0700 | [diff] [blame] | 2063 | for_each_node_state(n, N_HIGH_MEMORY) |
Christoph Lameter | 397874d | 2006-03-06 15:42:53 -0800 | [diff] [blame] | 2064 | if (md->node[n]) |
| 2065 | seq_printf(m, " N%d=%lu", n, md->node[n]); |
| 2066 | out: |
| 2067 | seq_putc(m, '\n'); |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2068 | kfree(md); |
| 2069 | |
| 2070 | if (m->count < m->size) |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2071 | m->version = (vma != priv->tail_vma) ? vma->vm_start : 0; |
Christoph Lameter | 1a75a6c | 2006-01-08 01:01:02 -0800 | [diff] [blame] | 2072 | return 0; |
| 2073 | } |