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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* internal.h: mm/ internal definitions
2 *
3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
Nick Piggin0f8053a2006-03-22 00:08:33 -080011#ifndef __MM_INTERNAL_H
12#define __MM_INTERNAL_H
13
14#include <linux/mm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015
Jan Beulich42b77722008-07-23 21:27:10 -070016void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
17 unsigned long floor, unsigned long ceiling);
18
Nick Piggin7835e982006-03-22 00:08:40 -080019static inline void set_page_count(struct page *page, int v)
Nick Piggin77a8a782006-01-06 00:10:57 -080020{
Nick Piggin7835e982006-03-22 00:08:40 -080021 atomic_set(&page->_count, v);
22}
23
24/*
25 * Turn a non-refcounted page (->_count == 0) into refcounted with
26 * a count of one.
27 */
28static inline void set_page_refcounted(struct page *page)
29{
Sasha Levin309381fea2014-01-23 15:52:54 -080030 VM_BUG_ON_PAGE(PageTail(page), page);
31 VM_BUG_ON_PAGE(atomic_read(&page->_count), page);
Nick Piggin77a8a782006-01-06 00:10:57 -080032 set_page_count(page, 1);
Nick Piggin77a8a782006-01-06 00:10:57 -080033}
34
Andrea Arcangeli70b50f92011-11-02 13:36:59 -070035static inline void __get_page_tail_foll(struct page *page,
36 bool get_page_head)
37{
38 /*
39 * If we're getting a tail page, the elevated page->_count is
40 * required only in the head page and we will elevate the head
41 * page->_count and tail page->_mapcount.
42 *
43 * We elevate page_tail->_mapcount for tail pages to force
44 * page_tail->_count to be zero at all times to avoid getting
45 * false positives from get_page_unless_zero() with
46 * speculative page access (like in
47 * page_cache_get_speculative()) on tail pages.
48 */
Sasha Levin309381fea2014-01-23 15:52:54 -080049 VM_BUG_ON_PAGE(atomic_read(&page->first_page->_count) <= 0, page);
Andrea Arcangeli70b50f92011-11-02 13:36:59 -070050 if (get_page_head)
51 atomic_inc(&page->first_page->_count);
Oleg Nesterovc7288522014-01-21 15:49:02 -080052 get_huge_page_tail(page);
Andrea Arcangeli70b50f92011-11-02 13:36:59 -070053}
54
55/*
56 * This is meant to be called as the FOLL_GET operation of
57 * follow_page() and it must be called while holding the proper PT
58 * lock while the pte (or pmd_trans_huge) is still mapping the page.
59 */
60static inline void get_page_foll(struct page *page)
61{
62 if (unlikely(PageTail(page)))
63 /*
64 * This is safe only because
65 * __split_huge_page_refcount() can't run under
66 * get_page_foll() because we hold the proper PT lock.
67 */
68 __get_page_tail_foll(page, true);
69 else {
70 /*
71 * Getting a normal page or the head of a compound page
72 * requires to already have an elevated page->_count.
73 */
Sasha Levin309381fea2014-01-23 15:52:54 -080074 VM_BUG_ON_PAGE(atomic_read(&page->_count) <= 0, page);
Andrea Arcangeli70b50f92011-11-02 13:36:59 -070075 atomic_inc(&page->_count);
76 }
77}
78
Hugh Dickins03f64622009-09-21 17:03:35 -070079extern unsigned long highest_memmap_pfn;
80
Lee Schermerhorn894bc312008-10-18 20:26:39 -070081/*
82 * in mm/vmscan.c:
83 */
Nick Piggin62695a82008-10-18 20:26:09 -070084extern int isolate_lru_page(struct page *page);
Lee Schermerhorn894bc312008-10-18 20:26:39 -070085extern void putback_lru_page(struct page *page);
Lisa Du6e543d52013-09-11 14:22:36 -070086extern bool zone_reclaimable(struct zone *zone);
Nick Piggin62695a82008-10-18 20:26:09 -070087
Lee Schermerhorn894bc312008-10-18 20:26:39 -070088/*
Bob Liu62190492012-12-11 16:00:37 -080089 * in mm/rmap.c:
90 */
91extern pmd_t *mm_find_pmd(struct mm_struct *mm, unsigned long address);
92
93/*
Lee Schermerhorn894bc312008-10-18 20:26:39 -070094 * in mm/page_alloc.c
95 */
Yasunori Goto0c0a4a52008-04-28 02:13:34 -070096extern void __free_pages_bootmem(struct page *page, unsigned int order);
Wu Fengguang20a03072009-06-16 15:32:22 -070097extern void prep_compound_page(struct page *page, unsigned long order);
Wu Fengguang8d22ba12009-12-16 12:19:58 +010098#ifdef CONFIG_MEMORY_FAILURE
99extern bool is_free_buddy_page(struct page *page);
100#endif
Han Pingtian42aa83c2014-01-23 15:53:28 -0800101extern int user_min_free_kbytes;
Wu Fengguang20a03072009-06-16 15:32:22 -0700102
Michal Nazarewiczff9543f2011-12-29 13:09:50 +0100103#if defined CONFIG_COMPACTION || defined CONFIG_CMA
104
105/*
106 * in mm/compaction.c
107 */
108/*
109 * compact_control is used to track pages being migrated and the free pages
110 * they are being migrated to during memory compaction. The free_pfn starts
111 * at the end of a zone and migrate_pfn begins at the start. Movable pages
112 * are moved to the end of a zone during a compaction run and the run
113 * completes when free_pfn <= migrate_pfn
114 */
115struct compact_control {
116 struct list_head freepages; /* List of free pages to migrate to */
117 struct list_head migratepages; /* List of pages being migrated */
118 unsigned long nr_freepages; /* Number of isolated free pages */
119 unsigned long nr_migratepages; /* Number of pages to migrate */
120 unsigned long free_pfn; /* isolate_freepages search base */
121 unsigned long migrate_pfn; /* isolate_migratepages search base */
Linus Torvalds68e3e922012-06-03 20:05:57 -0700122 bool sync; /* Synchronous migration */
Mel Gormanbb13ffe2012-10-08 16:32:41 -0700123 bool ignore_skip_hint; /* Scan blocks even if marked skip */
Mel Gormanc89511a2012-10-08 16:32:45 -0700124 bool finished_update_free; /* True when the zone cached pfns are
125 * no longer being updated
126 */
127 bool finished_update_migrate;
Michal Nazarewiczff9543f2011-12-29 13:09:50 +0100128
129 int order; /* order a direct compactor needs */
130 int migratetype; /* MOVABLE, RECLAIMABLE etc */
131 struct zone *zone;
Shaohua Lie64c5232012-10-08 16:32:27 -0700132 bool contended; /* True if a lock was contended */
Michal Nazarewiczff9543f2011-12-29 13:09:50 +0100133};
134
135unsigned long
Mel Gormanbb13ffe2012-10-08 16:32:41 -0700136isolate_freepages_range(struct compact_control *cc,
137 unsigned long start_pfn, unsigned long end_pfn);
Michal Nazarewiczff9543f2011-12-29 13:09:50 +0100138unsigned long
139isolate_migratepages_range(struct zone *zone, struct compact_control *cc,
Minchan Kime46a2872012-10-08 16:33:48 -0700140 unsigned long low_pfn, unsigned long end_pfn, bool unevictable);
Michal Nazarewiczff9543f2011-12-29 13:09:50 +0100141
142#endif
Nick Piggin0f8053a2006-03-22 00:08:33 -0800143
Mel Gorman48f13bf2007-10-16 01:26:10 -0700144/*
Mel Gorman6c144662014-01-23 15:53:38 -0800145 * This function returns the order of a free page in the buddy system. In
146 * general, page_zone(page)->lock must be held by the caller to prevent the
147 * page from being allocated in parallel and returning garbage as the order.
148 * If a caller does not hold page_zone(page)->lock, it must guarantee that the
149 * page cannot be allocated or merged in parallel.
Mel Gorman48f13bf2007-10-16 01:26:10 -0700150 */
151static inline unsigned long page_order(struct page *page)
152{
KAMEZAWA Hiroyuki572438f2010-10-26 14:22:08 -0700153 /* PageBuddy() must be checked by the caller */
Mel Gorman48f13bf2007-10-16 01:26:10 -0700154 return page_private(page);
155}
Alexander van Heukelumb5a0e012008-02-23 15:24:06 -0800156
Namhyung Kim6038def2011-05-24 17:11:22 -0700157/* mm/util.c */
158void __vma_link_list(struct mm_struct *mm, struct vm_area_struct *vma,
159 struct vm_area_struct *prev, struct rb_node *rb_parent);
160
Hugh Dickinsaf8e3352009-12-14 17:58:59 -0800161#ifdef CONFIG_MMU
Michel Lespinassecea10a12013-02-22 16:32:44 -0800162extern long __mlock_vma_pages_range(struct vm_area_struct *vma,
163 unsigned long start, unsigned long end, int *nonblocking);
Hugh Dickinsaf8e3352009-12-14 17:58:59 -0800164extern void munlock_vma_pages_range(struct vm_area_struct *vma,
165 unsigned long start, unsigned long end);
166static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
167{
168 munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end);
169}
170
Nick Pigginb291f002008-10-18 20:26:44 -0700171/*
Hugh Dickins39b5f292012-10-08 16:33:18 -0700172 * Called only in fault path, to determine if a new page is being
173 * mapped into a LOCKED vma. If it is, mark page as mlocked.
Nick Pigginb291f002008-10-18 20:26:44 -0700174 */
Ying Han096a7cf2012-05-29 15:06:25 -0700175static inline int mlocked_vma_newpage(struct vm_area_struct *vma,
176 struct page *page)
Nick Pigginb291f002008-10-18 20:26:44 -0700177{
Sasha Levin309381fea2014-01-23 15:52:54 -0800178 VM_BUG_ON_PAGE(PageLRU(page), page);
Nick Pigginb291f002008-10-18 20:26:44 -0700179
180 if (likely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED))
181 return 0;
182
Nick Piggin5344b7e2008-10-18 20:26:51 -0700183 if (!TestSetPageMlocked(page)) {
David Rientjes8449d212012-10-08 16:34:06 -0700184 mod_zone_page_state(page_zone(page), NR_MLOCK,
185 hpage_nr_pages(page));
Nick Piggin5344b7e2008-10-18 20:26:51 -0700186 count_vm_event(UNEVICTABLE_PGMLOCKED);
187 }
Nick Pigginb291f002008-10-18 20:26:44 -0700188 return 1;
189}
190
191/*
Hugh Dickins73848b42009-12-14 17:59:22 -0800192 * must be called with vma's mmap_sem held for read or write, and page locked.
Nick Pigginb291f002008-10-18 20:26:44 -0700193 */
194extern void mlock_vma_page(struct page *page);
Michel Lespinasseff6a6da2013-02-27 17:02:44 -0800195extern unsigned int munlock_vma_page(struct page *page);
Nick Pigginb291f002008-10-18 20:26:44 -0700196
197/*
198 * Clear the page's PageMlocked(). This can be useful in a situation where
199 * we want to unconditionally remove a page from the pagecache -- e.g.,
200 * on truncation or freeing.
201 *
202 * It is legal to call this function for any page, mlocked or not.
203 * If called for a page that is still mapped by mlocked vmas, all we do
204 * is revert to lazy LRU behaviour -- semantics are not broken.
205 */
Hugh Dickinse6c509f2012-10-08 16:33:19 -0700206extern void clear_page_mlock(struct page *page);
Nick Pigginb291f002008-10-18 20:26:44 -0700207
208/*
209 * mlock_migrate_page - called only from migrate_page_copy() to
Nick Piggin5344b7e2008-10-18 20:26:51 -0700210 * migrate the Mlocked page flag; update statistics.
Nick Pigginb291f002008-10-18 20:26:44 -0700211 */
212static inline void mlock_migrate_page(struct page *newpage, struct page *page)
213{
Nick Piggin5344b7e2008-10-18 20:26:51 -0700214 if (TestClearPageMlocked(page)) {
215 unsigned long flags;
Mel Gormanb32967f2012-11-19 12:35:47 +0000216 int nr_pages = hpage_nr_pages(page);
Nick Piggin5344b7e2008-10-18 20:26:51 -0700217
218 local_irq_save(flags);
Mel Gormanb32967f2012-11-19 12:35:47 +0000219 __mod_zone_page_state(page_zone(page), NR_MLOCK, -nr_pages);
Nick Pigginb291f002008-10-18 20:26:44 -0700220 SetPageMlocked(newpage);
Mel Gormanb32967f2012-11-19 12:35:47 +0000221 __mod_zone_page_state(page_zone(newpage), NR_MLOCK, nr_pages);
Nick Piggin5344b7e2008-10-18 20:26:51 -0700222 local_irq_restore(flags);
223 }
Nick Pigginb291f002008-10-18 20:26:44 -0700224}
225
Mel Gormanb32967f2012-11-19 12:35:47 +0000226extern pmd_t maybe_pmd_mkwrite(pmd_t pmd, struct vm_area_struct *vma);
227
Andrea Arcangeli71e3aac2011-01-13 15:46:52 -0800228#ifdef CONFIG_TRANSPARENT_HUGEPAGE
229extern unsigned long vma_address(struct page *page,
230 struct vm_area_struct *vma);
231#endif
Hugh Dickinsaf8e3352009-12-14 17:58:59 -0800232#else /* !CONFIG_MMU */
Ying Han096a7cf2012-05-29 15:06:25 -0700233static inline int mlocked_vma_newpage(struct vm_area_struct *v, struct page *p)
Nick Pigginb291f002008-10-18 20:26:44 -0700234{
235 return 0;
236}
237static inline void clear_page_mlock(struct page *page) { }
238static inline void mlock_vma_page(struct page *page) { }
239static inline void mlock_migrate_page(struct page *new, struct page *old) { }
240
Hugh Dickinsaf8e3352009-12-14 17:58:59 -0800241#endif /* !CONFIG_MMU */
Lee Schermerhorn894bc312008-10-18 20:26:39 -0700242
Alexander van Heukelumb5a0e012008-02-23 15:24:06 -0800243/*
Andy Whitcroft69d177c2008-11-06 12:53:26 -0800244 * Return the mem_map entry representing the 'offset' subpage within
245 * the maximally aligned gigantic page 'base'. Handle any discontiguity
246 * in the mem_map at MAX_ORDER_NR_PAGES boundaries.
247 */
248static inline struct page *mem_map_offset(struct page *base, int offset)
249{
250 if (unlikely(offset >= MAX_ORDER_NR_PAGES))
251 return pfn_to_page(page_to_pfn(base) + offset);
252 return base + offset;
253}
254
255/*
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300256 * Iterator over all subpages within the maximally aligned gigantic
Andy Whitcroft69d177c2008-11-06 12:53:26 -0800257 * page 'base'. Handle any discontiguity in the mem_map.
258 */
259static inline struct page *mem_map_next(struct page *iter,
260 struct page *base, int offset)
261{
262 if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) {
263 unsigned long pfn = page_to_pfn(base) + offset;
264 if (!pfn_valid(pfn))
265 return NULL;
266 return pfn_to_page(pfn);
267 }
268 return iter + 1;
269}
270
271/*
Alexander van Heukelumb5a0e012008-02-23 15:24:06 -0800272 * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node,
273 * so all functions starting at paging_init should be marked __init
274 * in those cases. SPARSEMEM, however, allows for memory hotplug,
275 * and alloc_bootmem_node is not used.
276 */
277#ifdef CONFIG_SPARSEMEM
278#define __paginginit __meminit
279#else
280#define __paginginit __init
281#endif
282
Mel Gorman6b74ab92008-07-23 21:26:49 -0700283/* Memory initialisation debug and verification */
284enum mminit_level {
285 MMINIT_WARNING,
286 MMINIT_VERIFY,
287 MMINIT_TRACE
288};
289
290#ifdef CONFIG_DEBUG_MEMORY_INIT
291
292extern int mminit_loglevel;
293
294#define mminit_dprintk(level, prefix, fmt, arg...) \
295do { \
296 if (level < mminit_loglevel) { \
297 printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \
298 printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \
299 } \
300} while (0)
301
Mel Gorman708614e2008-07-23 21:26:51 -0700302extern void mminit_verify_pageflags_layout(void);
303extern void mminit_verify_page_links(struct page *page,
304 enum zone_type zone, unsigned long nid, unsigned long pfn);
Mel Gorman68ad8df2008-07-23 21:26:52 -0700305extern void mminit_verify_zonelist(void);
Mel Gorman708614e2008-07-23 21:26:51 -0700306
Mel Gorman6b74ab92008-07-23 21:26:49 -0700307#else
308
309static inline void mminit_dprintk(enum mminit_level level,
310 const char *prefix, const char *fmt, ...)
311{
312}
313
Mel Gorman708614e2008-07-23 21:26:51 -0700314static inline void mminit_verify_pageflags_layout(void)
315{
316}
317
318static inline void mminit_verify_page_links(struct page *page,
319 enum zone_type zone, unsigned long nid, unsigned long pfn)
320{
321}
Mel Gorman68ad8df2008-07-23 21:26:52 -0700322
323static inline void mminit_verify_zonelist(void)
324{
325}
Mel Gorman6b74ab92008-07-23 21:26:49 -0700326#endif /* CONFIG_DEBUG_MEMORY_INIT */
Mel Gorman2dbb51c2008-07-23 21:26:52 -0700327
328/* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
329#if defined(CONFIG_SPARSEMEM)
330extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
331 unsigned long *end_pfn);
332#else
333static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn,
334 unsigned long *end_pfn)
335{
336}
337#endif /* CONFIG_SPARSEMEM */
338
Mel Gormanfa5e0842009-06-16 15:33:22 -0700339#define ZONE_RECLAIM_NOSCAN -2
340#define ZONE_RECLAIM_FULL -1
341#define ZONE_RECLAIM_SOME 0
342#define ZONE_RECLAIM_SUCCESS 1
Wu Fengguang7c116f22009-12-16 12:19:59 +0100343
Wu Fengguang31d3d342009-12-16 12:19:59 +0100344extern int hwpoison_filter(struct page *p);
345
Wu Fengguang7c116f22009-12-16 12:19:59 +0100346extern u32 hwpoison_filter_dev_major;
347extern u32 hwpoison_filter_dev_minor;
Wu Fengguang478c5ff2009-12-16 12:19:59 +0100348extern u64 hwpoison_filter_flags_mask;
349extern u64 hwpoison_filter_flags_value;
Andi Kleen4fd466e2009-12-16 12:19:59 +0100350extern u64 hwpoison_filter_memcg;
Haicheng Li1bfe5fe2009-12-16 12:19:59 +0100351extern u32 hwpoison_filter_enable;
Al Viroeb36c582012-05-30 20:17:35 -0400352
353extern unsigned long vm_mmap_pgoff(struct file *, unsigned long,
354 unsigned long, unsigned long,
355 unsigned long, unsigned long);
Xishi Qiuca57df72012-07-31 16:43:19 -0700356
357extern void set_pageblock_order(void);
Minchan Kim02c6de82012-10-08 16:31:55 -0700358unsigned long reclaim_clean_pages_from_list(struct zone *zone,
359 struct list_head *page_list);
Bartlomiej Zolnierkiewiczd95ea5d2012-10-08 16:32:05 -0700360/* The ALLOC_WMARK bits are used as an index to zone->watermark */
361#define ALLOC_WMARK_MIN WMARK_MIN
362#define ALLOC_WMARK_LOW WMARK_LOW
363#define ALLOC_WMARK_HIGH WMARK_HIGH
364#define ALLOC_NO_WATERMARKS 0x04 /* don't check watermarks at all */
365
366/* Mask to get the watermark bits */
367#define ALLOC_WMARK_MASK (ALLOC_NO_WATERMARKS-1)
368
369#define ALLOC_HARDER 0x10 /* try to alloc harder */
370#define ALLOC_HIGH 0x20 /* __GFP_HIGH set */
371#define ALLOC_CPUSET 0x40 /* check for correct cpuset */
372#define ALLOC_CMA 0x80 /* allow allocations from CMA areas */
373
Michel Lespinassedb971412012-10-08 16:29:34 -0700374#endif /* __MM_INTERNAL_H */