Commit b349acc7 authored Nov 12, 2013 by Weijie Yang Committed by Linus Torvalds Nov 13, 2013

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>

parent c4a391b5

mm/zswap.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -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);