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During migration, page_owner info is now copied with the rest of the page, so the stacktrace leading to free page allocation during migration is overwritten. For debugging purposes, it might be however useful to know that the page has been migrated since its initial allocation. This might happen many times during the lifetime for different reasons and fully tracking this, especially with stacktraces would incur extra memory costs. As a compromise, store and print the migrate_reason of the last migration that occurred to the page. This is enough to distinguish compaction, numa balancing etc. Example page_owner entry after the patch: Page allocated via order 0, mask 0x24200ca(GFP_HIGHUSER_MOVABLE) PFN 628753 type Movable Block 1228 type Movable Flags 0x1fffff80040030(dirty|lru|swapbacked) [<ffffffff811682c4>] __alloc_pages_nodemask+0x134/0x230 [<ffffffff811b6325>] alloc_pages_vma+0xb5/0x250 [<ffffffff81177491>] shmem_alloc_page+0x61/0x90 [<ffffffff8117a438>] shmem_getpage_gfp+0x678/0x960 [<ffffffff8117c2b9>] shmem_fallocate+0x329/0x440 [<ffffffff811de600>] vfs_fallocate+0x140/0x230 [<ffffffff811df434>] SyS_fallocate+0x44/0x70 [<ffffffff8158cc2e>] entry_SYSCALL_64_fastpath+0x12/0x71 Page has been migrated, last migrate reason: compaction Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Minchan Kim <minchan@kernel.org> Cc: Sasha Levin <sasha.levin@oracle.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Michal Hocko <mhocko@suse.com> Cc: Hugh Dickins <hughd@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
67 lines
1.9 KiB
C
67 lines
1.9 KiB
C
#ifndef __LINUX_PAGE_OWNER_H
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#define __LINUX_PAGE_OWNER_H
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#include <linux/jump_label.h>
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#ifdef CONFIG_PAGE_OWNER
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extern struct static_key_false page_owner_inited;
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extern struct page_ext_operations page_owner_ops;
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extern void __reset_page_owner(struct page *page, unsigned int order);
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extern void __set_page_owner(struct page *page,
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unsigned int order, gfp_t gfp_mask);
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extern gfp_t __get_page_owner_gfp(struct page *page);
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extern void __copy_page_owner(struct page *oldpage, struct page *newpage);
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extern void __set_page_owner_migrate_reason(struct page *page, int reason);
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static inline void reset_page_owner(struct page *page, unsigned int order)
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{
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if (static_branch_unlikely(&page_owner_inited))
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__reset_page_owner(page, order);
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}
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static inline void set_page_owner(struct page *page,
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unsigned int order, gfp_t gfp_mask)
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{
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if (static_branch_unlikely(&page_owner_inited))
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__set_page_owner(page, order, gfp_mask);
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}
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static inline gfp_t get_page_owner_gfp(struct page *page)
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{
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if (static_branch_unlikely(&page_owner_inited))
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return __get_page_owner_gfp(page);
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else
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return 0;
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}
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static inline void copy_page_owner(struct page *oldpage, struct page *newpage)
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{
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if (static_branch_unlikely(&page_owner_inited))
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__copy_page_owner(oldpage, newpage);
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}
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static inline void set_page_owner_migrate_reason(struct page *page, int reason)
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{
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if (static_branch_unlikely(&page_owner_inited))
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__set_page_owner_migrate_reason(page, reason);
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}
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#else
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static inline void reset_page_owner(struct page *page, unsigned int order)
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{
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}
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static inline void set_page_owner(struct page *page,
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unsigned int order, gfp_t gfp_mask)
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{
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}
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static inline gfp_t get_page_owner_gfp(struct page *page)
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{
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return 0;
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}
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static inline void copy_page_owner(struct page *oldpage, struct page *newpage)
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{
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}
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static inline void set_page_owner_migrate_reason(struct page *page, int reason)
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{
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}
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#endif /* CONFIG_PAGE_OWNER */
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#endif /* __LINUX_PAGE_OWNER_H */
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