From: "Huang, Ying" <ying.huang@intel.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: tim.c.chen@intel.com, dave.hansen@intel.com,
andi.kleen@intel.com, aaron.lu@intel.com, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, Huang Ying <ying.huang@intel.com>,
Hugh Dickins <hughd@google.com>, Shaohua Li <shli@kernel.org>,
Minchan Kim <minchan@kernel.org>, Rik van Riel <riel@redhat.com>
Subject: [PATCH -v2 01/10] swap: Change SWAPFILE_CLUSTER to 512
Date: Thu, 1 Sep 2016 08:16:54 -0700 [thread overview]
Message-ID: <1472743023-4116-2-git-send-email-ying.huang@intel.com> (raw)
In-Reply-To: <1472743023-4116-1-git-send-email-ying.huang@intel.com>
From: Huang Ying <ying.huang@intel.com>
In this patch, the size of the swap cluster is changed to that of the
THP (Transparent Huge Page) on x86_64 architecture (512). This is for
the THP swap support on x86_64. Where one swap cluster will be used to
hold the contents of each THP swapped out. And some information of the
swapped out THP (such as compound map count) will be recorded in the
swap_cluster_info data structure.
In effect, this will enlarge swap cluster size by 2 times. Which may
make it harder to find a free cluster when the swap space becomes
fragmented. So that, this may reduce the continuous swap space
allocation and sequential write in theory. The performance test in 0day
show no regressions caused by this.
Cc: Hugh Dickins <hughd@google.com>
Cc: Shaohua Li <shli@kernel.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
---
mm/swapfile.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 8f1b97d..582912b 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -196,7 +196,7 @@ static void discard_swap_cluster(struct swap_info_struct *si,
}
}
-#define SWAPFILE_CLUSTER 256
+#define SWAPFILE_CLUSTER 512
#define LATENCY_LIMIT 256
static inline void cluster_set_flag(struct swap_cluster_info *info,
--
2.8.1
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next prev parent reply other threads:[~2016-09-01 15:18 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-01 15:16 [PATCH -v2 00/10] THP swap: Delay splitting THP during swapping out Huang, Ying
2016-09-01 15:16 ` Huang, Ying [this message]
2016-09-01 21:22 ` [PATCH -v2 01/10] swap: Change SWAPFILE_CLUSTER to 512 Andrew Morton
2016-09-01 23:04 ` Huang, Ying
2016-09-02 20:30 ` Andrew Morton
2016-09-02 20:37 ` Huang, Ying
2016-09-01 15:16 ` [PATCH -v2 02/10] mm, memcg: Add swap_cgroup_iter iterator Huang, Ying
2016-09-01 15:16 ` [PATCH -v2 03/10] mm, memcg: Support to charge/uncharge multiple swap entries Huang, Ying
2016-09-01 15:16 ` [PATCH -v2 04/10] mm, THP, swap: Add swap cluster allocate/free functions Huang, Ying
2016-09-01 15:16 ` [PATCH -v2 05/10] mm, THP, swap: Add get_huge_swap_page() Huang, Ying
2016-09-01 15:16 ` [PATCH -v2 06/10] mm, THP, swap: Support to clear SWAP_HAS_CACHE for huge page Huang, Ying
2016-09-01 15:17 ` [PATCH -v2 07/10] mm, THP, swap: Support to add/delete THP to/from swap cache Huang, Ying
2016-09-01 15:17 ` [PATCH -v2 08/10] mm, THP: Add can_split_huge_page() Huang, Ying
2016-09-01 15:17 ` [PATCH -v2 09/10] mm, THP, swap: Support to split THP in swap cache Huang, Ying
2016-09-01 15:17 ` [PATCH -v2 10/10] mm, THP, swap: Delay splitting THP during swap out Huang, Ying
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