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Message-Id: <20170525064635.2832-5-ying.huang@intel.com>
Date: Thu, 25 May 2017 14:46:26 +0800
From: "Huang, Ying" <ying.huang@...el.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
Huang Ying <ying.huang@...el.com>,
Johannes Weiner <hannes@...xchg.org>,
Minchan Kim <minchan@...nel.org>,
Hugh Dickins <hughd@...gle.com>, Shaohua Li <shli@...nel.org>,
Rik van Riel <riel@...hat.com>
Subject: [PATCH -mm 04/13] mm, THP, swap: Don't allocate huge cluster for file backed swap device
From: Huang Ying <ying.huang@...el.com>
It's hard to write a whole transparent huge page (THP) to a file
backed swap device during swapping out and the file backed swap device
isn't very popular. So the huge cluster allocation for the file
backed swap device is disabled.
Signed-off-by: "Huang, Ying" <ying.huang@...el.com>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: Minchan Kim <minchan@...nel.org>
Cc: Hugh Dickins <hughd@...gle.com>
Cc: Shaohua Li <shli@...nel.org>
Cc: Rik van Riel <riel@...hat.com>
---
mm/swapfile.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/mm/swapfile.c b/mm/swapfile.c
index bd0f38f31d3d..2a2f5d08f0a9 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -947,9 +947,10 @@ int get_swap_pages(int n_goal, bool cluster, swp_entry_t swp_entries[])
spin_unlock(&si->lock);
goto nextsi;
}
- if (cluster)
- n_ret = swap_alloc_cluster(si, swp_entries);
- else
+ if (cluster) {
+ if (!(si->flags & SWP_FILE))
+ n_ret = swap_alloc_cluster(si, swp_entries);
+ } else
n_ret = scan_swap_map_slots(si, SWAP_HAS_CACHE,
n_goal, swp_entries);
spin_unlock(&si->lock);
--
2.11.0
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