From: Rik van Riel <riel@redhat.com>
To: Minchan Kim <minchan.kim@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-mm <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>, Mel Gorman <mgorman@suse.de>,
Johannes Weiner <jweiner@redhat.com>
Subject: Re: [PATCH 2/3] compaction: compact unevictable page
Date: Tue, 30 Aug 2011 21:09:55 -0400 [thread overview]
Message-ID: <4E5D89E3.6020008@redhat.com> (raw)
In-Reply-To: <8ef02605a7a76b176167d90a285033afa8513326.1321112552.git.minchan.kim@gmail.com>
On 11/12/2011 11:37 AM, Minchan Kim wrote:
> Now compaction doesn't handle mlocked page as it uses __isolate_lru_page
> which doesn't consider unevicatable page. It has been used by just lumpy so
> it was pointless that it isolates unevictable page. But the situation is
> changed. Compaction could handle unevictable page and it can help getting
> big contiguos pages in fragment memory by many pinned page with mlock.
>
> I tested this patch with following scenario.
>
> 1. A : allocate 80% anon pages in system
> 2. B : allocate 20% mlocked page in system
> /* Maybe, mlocked pages are located in low pfn address */
> 3. kill A /* high pfn address are free */
> 4. echo 1> /proc/sys/vm/compact_memory
>
> old:
>
> compact_blocks_moved 251
> compact_pages_moved 44
>
> new:
>
> compact_blocks_moved 258
> compact_pages_moved 412
>
> CC: Mel Gorman<mgorman@suse.de>
> CC: Johannes Weiner<jweiner@redhat.com>
> CC: Rik van Riel<riel@redhat.com>
> Signed-off-by: Minchan Kim<minchan.kim@gmail.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
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next prev parent reply other threads:[~2011-08-31 1:10 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-12 16:37 [PATCH 0/3] Fix compaction about mlocked pages Minchan Kim
2011-08-29 16:43 ` [PATCH 3/3] compaction accouting fix Minchan Kim
2011-08-29 16:43 ` [PATCH 1/3] Correct isolate_mode_t bitwise type Minchan Kim
2011-08-29 16:43 ` [PATCH 2/3] compaction: compact unevictable page Minchan Kim
2011-10-06 21:54 ` [PATCH 0/3] Fix compaction about mlocked pages Andrew Morton
2011-10-06 23:07 ` Minchan Kim
2011-11-12 16:37 ` [PATCH 1/3] Correct isolate_mode_t bitwise type Minchan Kim
2011-08-30 17:51 ` Rik van Riel
2011-08-31 11:13 ` Johannes Weiner
2011-09-01 13:05 ` Mel Gorman
2011-09-02 3:29 ` Minchan Kim
2011-11-12 16:37 ` [PATCH 2/3] compaction: compact unevictable page Minchan Kim
2011-08-31 1:09 ` Rik van Riel [this message]
2011-08-31 11:19 ` Johannes Weiner
2011-08-31 14:41 ` Minchan Kim
2011-09-01 14:02 ` Mel Gorman
2011-09-02 4:48 ` Minchan Kim
2011-09-02 13:34 ` Mel Gorman
2011-11-12 16:37 ` [PATCH 3/3] compaction accouting fix Minchan Kim
2011-08-31 11:37 ` Johannes Weiner
2011-08-31 14:56 ` Minchan Kim
2011-08-31 15:03 ` Johannes Weiner
2011-09-01 14:20 ` Mel Gorman
2011-09-02 5:09 ` Minchan Kim
2011-09-02 13:36 ` Mel Gorman
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