From: Johannes Weiner <jweiner@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>,
Rik van Riel <riel@redhat.com>
Subject: Re: [PATCH 2/3] compaction: compact unevictable page
Date: Wed, 31 Aug 2011 13:19:54 +0200 [thread overview]
Message-ID: <20110831111954.GB17512@redhat.com> (raw)
In-Reply-To: <8ef02605a7a76b176167d90a285033afa8513326.1321112552.git.minchan.kim@gmail.com>
On Sun, Nov 13, 2011 at 01:37:42AM +0900, 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.
This may result in applications unexpectedly faulting and waiting on
mlocked pages under migration. I wonder how realtime people feel
about that?
WARNING: multiple messages have this Message-ID (diff)
From: Johannes Weiner <jweiner@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>,
Rik van Riel <riel@redhat.com>
Subject: Re: [PATCH 2/3] compaction: compact unevictable page
Date: Wed, 31 Aug 2011 13:19:54 +0200 [thread overview]
Message-ID: <20110831111954.GB17512@redhat.com> (raw)
In-Reply-To: <8ef02605a7a76b176167d90a285033afa8513326.1321112552.git.minchan.kim@gmail.com>
On Sun, Nov 13, 2011 at 01:37:42AM +0900, 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.
This may result in applications unexpectedly faulting and waiting on
mlocked pages under migration. I wonder how realtime people feel
about that?
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next prev parent reply other threads:[~2011-08-31 11:20 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-12 16:37 [PATCH 0/3] Fix compaction about mlocked pages Minchan Kim
2011-11-12 16:37 ` 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 21:54 ` Andrew Morton
2011-10-06 23:07 ` Minchan Kim
2011-10-06 23:07 ` Minchan Kim
2011-11-12 16:37 ` [PATCH 1/3] Correct isolate_mode_t bitwise type Minchan Kim
2011-11-12 16:37 ` Minchan Kim
2011-08-30 17:51 ` Rik van Riel
2011-08-30 17:51 ` Rik van Riel
2011-08-31 11:13 ` Johannes Weiner
2011-08-31 11:13 ` Johannes Weiner
2011-09-01 13:05 ` Mel Gorman
2011-09-01 13:05 ` Mel Gorman
2011-09-02 3:29 ` Minchan Kim
2011-09-02 3:29 ` Minchan Kim
2011-11-12 16:37 ` [PATCH 2/3] compaction: compact unevictable page Minchan Kim
2011-11-12 16:37 ` Minchan Kim
2011-08-31 1:09 ` Rik van Riel
2011-08-31 1:09 ` Rik van Riel
2011-08-31 11:19 ` Johannes Weiner [this message]
2011-08-31 11:19 ` Johannes Weiner
2011-08-31 14:41 ` Minchan Kim
2011-08-31 14:41 ` Minchan Kim
2011-09-01 14:02 ` Mel Gorman
2011-09-01 14:02 ` Mel Gorman
2011-09-02 4:48 ` Minchan Kim
2011-09-02 4:48 ` Minchan Kim
2011-09-02 13:34 ` Mel Gorman
2011-09-02 13:34 ` Mel Gorman
2011-11-12 16:37 ` [PATCH 3/3] compaction accouting fix Minchan Kim
2011-11-12 16:37 ` Minchan Kim
2011-08-31 11:37 ` Johannes Weiner
2011-08-31 11:37 ` Johannes Weiner
2011-08-31 14:56 ` Minchan Kim
2011-08-31 14:56 ` Minchan Kim
2011-08-31 15:03 ` Johannes Weiner
2011-08-31 15:03 ` Johannes Weiner
2011-09-01 14:20 ` Mel Gorman
2011-09-01 14:20 ` Mel Gorman
2011-09-02 5:09 ` Minchan Kim
2011-09-02 5:09 ` Minchan Kim
2011-09-02 13:36 ` Mel Gorman
2011-09-02 13:36 ` Mel Gorman
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