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mm/page_owner: don't define fields on struct page_ext by hard-coding

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There is a memory waste problem if we define field on struct page_ext by
hard-coding.  Entry size of struct page_ext includes the size of those
fields even if it is disabled at runtime.  Now, extra memory request at
runtime is possible so page_owner don't need to define it's own fields
by hard-coding.

This patch removes hard-coded define and uses extra memory for storing
page_owner information in page_owner.  Most of code are just mechanical
changes.

Link: http://lkml.kernel.org/r/1471315879-32294-7-git-send-email-iamjoonsoo.kim@lge.com
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
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 2016-10-07 16:58:30 -07:00 • committed by Linus Torvalds
parent 980ac1672e
commit 9300d8dfd2
2 changed files with 58 additions and 31 deletions
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6
include/linux/page_ext.h
View file

@ -44,12 +44,6 @@ enum page_ext_flags {
*/
struct page_ext {
unsigned long flags;
#ifdef CONFIG_PAGE_OWNER
unsigned int order;
gfp_t gfp_mask;
int last_migrate_reason;
depot_stack_handle_t handle;
#endif
};
extern void pgdat_page_ext_init(struct pglist_data *pgdat);