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mm/page_owner: introduce split_page_owner and replace manual handling 

split_page() calls set_page_owner() to set up page_owner to each pages.
But, it has a drawback that head page and the others have different
stacktrace because callsite of set_page_owner() is slightly differnt.
To avoid this problem, this patch copies head page's page_owner to the
others.  It needs to introduce new function, split_page_owner() but it
also remove the other function, get_page_owner_gfp() so looks good to
do.

Link: http://lkml.kernel.org/r/1464230275-25791-4-git-send-email-iamjoonsoo.kim@lge.com
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Alexander Potapenko <glider@google.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Joonsoo Kim 2016-07-26 15:23:49 -07:00 committed by Linus Torvalds
parent a8efe1c982
commit a9627bc5e3
3 changed files with 15 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
include/linux/page_owner.h
View File

@ -10,7 +10,7 @@ extern struct page_ext_operations page_owner_ops;
extern void __reset_page_owner(struct page *page, unsigned int order); extern void __reset_page_owner(struct page *page, unsigned int order);
extern void __set_page_owner(struct page *page, extern void __set_page_owner(struct page *page,
unsigned int order, gfp_t gfp_mask); unsigned int order, gfp_t gfp_mask);
extern gfp_t __get_page_owner_gfp(struct page *page); extern void __split_page_owner(struct page *page, unsigned int order);
extern void __copy_page_owner(struct page *oldpage, struct page *newpage); extern void __copy_page_owner(struct page *oldpage, struct page *newpage);
extern void __set_page_owner_migrate_reason(struct page *page, int reason); extern void __set_page_owner_migrate_reason(struct page *page, int reason);
extern void __dump_page_owner(struct page *page); extern void __dump_page_owner(struct page *page);
@ -28,12 +28,10 @@ static inline void set_page_owner(struct page *page,
__set_page_owner(page, order, gfp_mask); __set_page_owner(page, order, gfp_mask);
} }
static inline gfp_t get_page_owner_gfp(struct page *page) static inline void split_page_owner(struct page *page, unsigned int order)
{ {
if (static_branch_unlikely(&page_owner_inited)) if (static_branch_unlikely(&page_owner_inited))
return __get_page_owner_gfp(page); __split_page_owner(page, order);
else
return 0;
} }
static inline void copy_page_owner(struct page *oldpage, struct page *newpage) static inline void copy_page_owner(struct page *oldpage, struct page *newpage)
{ {
@ -58,9 +56,9 @@ static inline void set_page_owner(struct page *page,
unsigned int order, gfp_t gfp_mask) unsigned int order, gfp_t gfp_mask)
{ {
} }
static inline gfp_t get_page_owner_gfp(struct page *page) static inline void split_page_owner(struct page *page,
unsigned int order)
{ {
return 0;
} }
static inline void copy_page_owner(struct page *oldpage, struct page *newpage) static inline void copy_page_owner(struct page *oldpage, struct page *newpage)
{ {

8
mm/page_alloc.c
View File

@ -2461,7 +2461,6 @@ void free_hot_cold_page_list(struct list_head *list, bool cold)
void split_page(struct page *page, unsigned int order) void split_page(struct page *page, unsigned int order)
{ {
int i; int i;
gfp_t gfp_mask;
VM_BUG_ON_PAGE(PageCompound(page), page); VM_BUG_ON_PAGE(PageCompound(page), page);
VM_BUG_ON_PAGE(!page_count(page), page); VM_BUG_ON_PAGE(!page_count(page), page);
@ -2475,12 +2474,9 @@ void split_page(struct page *page, unsigned int order)
split_page(virt_to_page(page[0].shadow), order); split_page(virt_to_page(page[0].shadow), order);
#endif #endif
gfp_mask = get_page_owner_gfp(page); for (i = 1; i < (1 << order); i++)
set_page_owner(page, 0, gfp_mask);
for (i = 1; i < (1 << order); i++) {
set_page_refcounted(page + i); set_page_refcounted(page + i);
set_page_owner(page + i, 0, gfp_mask); split_page_owner(page, order);
}
} }
EXPORT_SYMBOL_GPL(split_page); EXPORT_SYMBOL_GPL(split_page);

16
mm/page_owner.c
View File

@ -94,17 +94,17 @@ void __set_page_owner_migrate_reason(struct page *page, int reason)
page_ext->last_migrate_reason = reason; page_ext->last_migrate_reason = reason;
} }
gfp_t __get_page_owner_gfp(struct page *page) void __split_page_owner(struct page *page, unsigned int order)
{ {
int i;
struct page_ext *page_ext = lookup_page_ext(page); struct page_ext *page_ext = lookup_page_ext(page);
if (unlikely(!page_ext))
/*
* The caller just returns 0 if no valid gfp
* So return 0 here too.
*/
return 0;
return page_ext->gfp_mask; if (unlikely(!page_ext))
return;
page_ext->order = 0;
for (i = 1; i < (1 << order); i++)
__copy_page_owner(page, page + i);
} }
void __copy_page_owner(struct page *oldpage, struct page *newpage) void __copy_page_owner(struct page *oldpage, struct page *newpage)