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Subject[PATCH v3 3/3] mm/zswap: avoid unnecessary page scanning
Date
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>
Cc: Minchan Kim <minchan@kernel.org>
Cc: stable@vger.kernel.org
Acked-by: Seth Jennings <sjenning@linux.vnet.ibm.com>
---
mm/zswap.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/mm/zswap.c b/mm/zswap.c
index 1be7b90..cc40e6a 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);
--
1.7.10.4



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