The patch titled
vmscan: set try_to_release_page's gfp_mask to 0
has been added to the -mm tree. Its filename is
vmscan-set-try_to_release_pages-gfp_mask-to-0.patch
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The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: vmscan: set try_to_release_page's gfp_mask to 0
From: Hisashi Hifumi <hifumi.hisashi@xxxxxxxxxxxxx>
shrink_page_list() passes a gfp_mask to try_to_release_page. When
shrink_page_list is called from kswapd or buddy system, gfp_mask is set
and (gfp_mask & __GFP_WAIT) and (gfp_mask & __GFP_FS) check is positive.
releasepage of jbd/jbd2(ext3/4, ocfs2) and XFS use this parameter.
If try_to_free_page fails due to bh busy in jbd/jbd2, jbd/jbd2 lets a
thread wait for committing transaction. I think this has big performance
impacts for vmscan. So I modified shrink_page_list not to pass gfp_mask
to try_to_release_page in ordered to improve vmscan performance.
Signed-off-by: Hisashi Hifumi <hifumi.hisashi@xxxxxxxxxxxxx>
Cc: Mingming Cao <cmm@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmscan.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN mm/vmscan.c~vmscan-set-try_to_release_pages-gfp_mask-to-0 mm/vmscan.c
--- a/mm/vmscan.c~vmscan-set-try_to_release_pages-gfp_mask-to-0
+++ a/mm/vmscan.c
@@ -614,7 +614,7 @@ static unsigned long shrink_page_list(st
* Otherwise, leave the page on the LRU so it is swappable.
*/
if (PagePrivate(page)) {
- if (!try_to_release_page(page, sc->gfp_mask))
+ if (!try_to_release_page(page, 0))
goto activate_locked;
if (!mapping && page_count(page) == 1) {
unlock_page(page);
_
Patches currently in -mm which might be from hifumi.hisashi@xxxxxxxxxxxxx are
vmscan-set-try_to_release_pages-gfp_mask-to-0.patch
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