linux-kernel - [RFC 04/11] mm: remove SWAP_MLOCK check for SWAP

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Date:   Thu,  2 Mar 2017 15:39:18 +0900
From:   Minchan Kim <minchan@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     kernel-team@....com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...e.com>,
        Minchan Kim <minchan@...nel.org>
Subject: [RFC 04/11] mm: remove SWAP_MLOCK check for SWAP_SUCCESS in ttu

If the page is mapped and rescue in ttuo, page_mapcount(page) == 0 cannot
be true so page_mapcount check in ttu is enough to return SWAP_SUCCESS.
IOW, SWAP_MLOCK check is redundant so remove it.

Signed-off-by: Minchan Kim <minchan@...nel.org>
---
 mm/rmap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/rmap.c b/mm/rmap.c
index 3a14013..0a48958 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1523,7 +1523,7 @@ int try_to_unmap(struct page *page, enum ttu_flags flags)
 	else
 		ret = rmap_walk(page, &rwc);
 
-	if (ret != SWAP_MLOCK && !page_mapcount(page))
+	if (!page_mapcount(page))
 		ret = SWAP_SUCCESS;
 	return ret;
 }
-- 
2.7.4