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05 April 2024, 19:05:47 UTC
Revision 57cbc87e03c2f473d8f0579186c078ee06f48f2c authored by Joonsoo Kim on 13 November 2014, 23:19:36 UTC, committed by Linus Torvalds on 14 November 2014, 00:17:06 UTC 
mm/debug-pagealloc: correct freepage accounting and order resetting
 
One thing I did in this patch is fixing freepage accounting.  If we
clear guard page and link it onto isolate buddy list, we should not
increase freepage count.  This patch adds conditional branch to skip
counting in this case.  Without this patch, this overcounting happens
frequently if guard order is set and CMA is used.

Another thing fixed in this patch is the target to reset order.  In
__free_one_page(), we check the buddy page whether it is a guard page or
not.  And, if so, we should clear guard attribute on the buddy page and
reset order of it to 0.  But, current code resets original page's order
rather than buddy one's.  Maybe, this doesn't have any problem, because
whole merged page's order will be re-assigned soon.  But, it is better
to correct code.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Gioh Kim <gioh.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 8edc6e1
History
Tip revision: 57cbc87e03c2f473d8f0579186c078ee06f48f2c authored by Joonsoo Kim on 13 November 2014, 23:19:36 UTC
mm/debug-pagealloc: correct freepage accounting and order resetting
Tip revision: 57cbc87
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