From: Andrew Morton <akpm@linux-foundation.org>
To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Minchan Kim <minchan@kernel.org>,
Dave Chinner <david@fromorbit.com>,
nowhere <nowhere@hakkenden.ath.cx>, Michal Hocko <mhocko@suse.cz>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: Kswapd in 3.2.0-rc5 is a CPU hog
Date: Tue, 10 Jan 2012 14:33:30 -0800 [thread overview]
Message-ID: <20120110143330.44cf1ccf.akpm@linux-foundation.org> (raw)
In-Reply-To: <20111227135658.08c8016a.kamezawa.hiroyu@jp.fujitsu.com>
On Tue, 27 Dec 2011 13:56:58 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote:
> Hmm, if I understand correctly,
>
> - dd's speed down is caused by kswapd's cpu consumption.
> - kswapd's cpu consumption is enlarged by shrink_slab() (by perf)
> - kswapd can't stop because NORMAL zone is small.
> - memory reclaim speed is enough because dd can't get enough cpu.
>
> I wonder reducing to call shrink_slab() may be a help but I'm not sure
> where lock conention comes from...
Nikolay, it sounds as if this problem has only recently started
happening? Was 3.1 OK?
If so, we should work out what we did post-3.1 to cause this.
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WARNING: multiple messages have this Message-ID (diff)
From: Andrew Morton <akpm@linux-foundation.org>
To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Minchan Kim <minchan@kernel.org>,
Dave Chinner <david@fromorbit.com>,
nowhere <nowhere@hakkenden.ath.cx>, Michal Hocko <mhocko@suse.cz>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: Kswapd in 3.2.0-rc5 is a CPU hog
Date: Tue, 10 Jan 2012 14:33:30 -0800 [thread overview]
Message-ID: <20120110143330.44cf1ccf.akpm@linux-foundation.org> (raw)
In-Reply-To: <20111227135658.08c8016a.kamezawa.hiroyu@jp.fujitsu.com>
On Tue, 27 Dec 2011 13:56:58 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote:
> Hmm, if I understand correctly,
>
> - dd's speed down is caused by kswapd's cpu consumption.
> - kswapd's cpu consumption is enlarged by shrink_slab() (by perf)
> - kswapd can't stop because NORMAL zone is small.
> - memory reclaim speed is enough because dd can't get enough cpu.
>
> I wonder reducing to call shrink_slab() may be a help but I'm not sure
> where lock conention comes from...
Nikolay, it sounds as if this problem has only recently started
happening? Was 3.1 OK?
If so, we should work out what we did post-3.1 to cause this.
next prev parent reply other threads:[~2012-01-10 22:33 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-21 3:10 Kswapd in 3.2.0-rc5 is a CPU hog Nikolay S.
2011-12-21 9:52 ` Michal Hocko
2011-12-21 9:52 ` Michal Hocko
2011-12-21 10:15 ` nowhere
2011-12-21 10:15 ` nowhere
2011-12-21 10:24 ` Michal Hocko
2011-12-21 10:24 ` Michal Hocko
2011-12-21 10:24 ` Michal Hocko
2011-12-21 10:52 ` nowhere
2011-12-21 10:52 ` nowhere
2011-12-21 10:52 ` nowhere
2011-12-21 14:06 ` Alex Elder
2011-12-21 14:06 ` Alex Elder
2011-12-21 14:06 ` Alex Elder
2011-12-21 14:19 ` nowhere
2011-12-21 14:19 ` nowhere
2011-12-21 14:19 ` nowhere
2011-12-21 22:55 ` Dave Chinner
2011-12-21 22:55 ` Dave Chinner
2011-12-23 9:01 ` nowhere
2011-12-23 9:01 ` nowhere
2011-12-23 10:20 ` Dave Chinner
2011-12-23 10:20 ` Dave Chinner
2011-12-23 11:04 ` nowhere
2011-12-23 11:04 ` nowhere
2011-12-23 20:45 ` Dave Chinner
2011-12-23 20:45 ` Dave Chinner
2011-12-25 9:09 ` Hillf Danton
2011-12-25 9:09 ` Hillf Danton
2011-12-25 10:21 ` Nikolay S.
2011-12-25 10:21 ` Nikolay S.
2011-12-26 12:35 ` Hillf Danton
2011-12-26 12:35 ` Hillf Danton
2011-12-27 0:20 ` KAMEZAWA Hiroyuki
2011-12-27 0:20 ` KAMEZAWA Hiroyuki
2011-12-27 13:33 ` Hillf Danton
2011-12-27 13:33 ` Hillf Danton
2011-12-28 0:06 ` KAMEZAWA Hiroyuki
2011-12-28 0:06 ` KAMEZAWA Hiroyuki
2011-12-27 2:15 ` KAMEZAWA Hiroyuki
2011-12-27 2:15 ` KAMEZAWA Hiroyuki
2011-12-27 2:50 ` Nikolay S.
2011-12-27 2:50 ` Nikolay S.
2011-12-27 4:44 ` KAMEZAWA Hiroyuki
2011-12-27 4:44 ` KAMEZAWA Hiroyuki
2011-12-27 6:06 ` nowhere
2011-12-27 6:06 ` nowhere
2011-12-28 21:33 ` Dave Chinner
2011-12-28 21:33 ` Dave Chinner
2011-12-28 22:57 ` KOSAKI Motohiro
2011-12-28 22:57 ` KOSAKI Motohiro
2012-01-02 7:00 ` Dave Chinner
2012-01-02 7:00 ` Dave Chinner
2011-12-27 3:57 ` Minchan Kim
2011-12-27 3:57 ` Minchan Kim
2011-12-27 4:56 ` KAMEZAWA Hiroyuki
2011-12-27 4:56 ` KAMEZAWA Hiroyuki
2012-01-10 22:33 ` Andrew Morton [this message]
2012-01-10 22:33 ` Andrew Morton
2012-01-11 3:25 ` Nikolay S.
2012-01-11 3:25 ` Nikolay S.
2012-01-11 4:42 ` Andrew Morton
2012-01-11 4:42 ` Andrew Morton
2012-01-11 0:33 ` Dave Chinner
2012-01-11 0:33 ` Dave Chinner
2012-01-11 1:17 ` Rik van Riel
2012-01-11 1:17 ` Rik van Riel
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