From b349acc76b7f65400b85abd09a5379ddd6fa5a97 Mon Sep 17 00:00:00 2001 From: Weijie Yang <weijie.yang@samsung.com> Date: Tue, 12 Nov 2013 15:07:52 -0800 Subject: [PATCH] mm/zswap: avoid unnecessary page scanning Add SetPageReclaim() before __swap_writepage() so that page can be moved to the tail of the inactive list, which can avoid unnecessary page scanning as this page was reclaimed by swap subsystem before. Signed-off-by: Weijie Yang <weijie.yang@samsung.com> Reviewed-by: Bob Liu <bob.liu@oracle.com> Reviewed-by: Minchan Kim <minchan@kernel.org> Acked-by: Seth Jennings <sjenning@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> --- mm/zswap.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/mm/zswap.c b/mm/zswap.c index d93510c6aa2da..001474c1a5946 100644 --- a/mm/zswap.c +++ b/mm/zswap.c @@ -556,6 +556,9 @@ static int zswap_writeback_entry(struct zbud_pool *pool, unsigned long handle) SetPageUptodate(page); } + /* move it to the tail of the inactive list after end_writeback */ + SetPageReclaim(page); + /* start writeback */ __swap_writepage(page, &wbc, end_swap_bio_write); page_cache_release(page); -- GitLab