From: Zdenek Kabelac <zkabelac@redhat.com>
To: Jiri Slaby <jslaby@suse.cz>
Cc: Mel Gorman <mgorman@suse.de>,
Valdis.Kletnieks@vt.edu, Jiri Slaby <jirislaby@gmail.com>,
linux-mm@kvack.org, LKML <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: kswapd0: excessive CPU usage
Date: Sun, 04 Nov 2012 12:26:34 +0100 [thread overview]
Message-ID: <509650EA.5060508@redhat.com> (raw)
In-Reply-To: <509422C3.1000803@suse.cz>
Dne 2.11.2012 20:45, Jiri Slaby napsal(a):
> On 11/02/2012 11:53 AM, Jiri Slaby wrote:
>> On 11/02/2012 11:44 AM, Zdenek Kabelac wrote:
>>>>> Yes, applying this instead of the revert fixes the issue as well.
>>>
>>> I've applied this patch on 3.7.0-rc3 kernel - and I still see excessive
>>> CPU usage - mainly after suspend/resume
>>>
>>> Here is just simple kswapd backtrace from running kernel:
>>
>> Yup, this is what we were seeing with the former patch only too. Try to
>> apply the other one too:
>> https://patchwork.kernel.org/patch/1673231/
>>
>> For me I would say, it is fixed by the two patches now. I won't be able
>> to report later, since I'm leaving to a conference tomorrow.
>
> Damn it. It recurred right now, with both patches applied. After I
> started a java program which consumed some more memory. Though there are
> still 2 gigs free, kswap is spinning:
> [<ffffffff810b00da>] __cond_resched+0x2a/0x40
> [<ffffffff811318a0>] shrink_slab+0x1c0/0x2d0
> [<ffffffff8113478d>] kswapd+0x66d/0xb60
> [<ffffffff810a25d0>] kthread+0xc0/0xd0
> [<ffffffff816aa29c>] ret_from_fork+0x7c/0xb0
> [<ffffffffffffffff>] 0xffffffffffffffff
>
Yep - wanted to report myself again and noticed your replay.
Yes - I've now also both patches installed - and I still observe kswapd eating
my CPU. It seems (at least for me) that prior suspend and resume is way to
trigger it more frequently.
However there is a change in behaviour - while before kswapd was running
almost indefinitely now the> CPU spikes are in the range of minutes.
(i.e. uptime ~2days - kswapd has over 32minutes CPU time)
My machine has 4GB, and no swap (disabled)
firefox (22mins), thunderbird(3mins) and pidgin(0.5min) are the 3 most memory
and CPU hungry apps for this moment.
Zdenek
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WARNING: multiple messages have this Message-ID (diff)
From: Zdenek Kabelac <zkabelac@redhat.com>
To: Jiri Slaby <jslaby@suse.cz>
Cc: Mel Gorman <mgorman@suse.de>,
Valdis.Kletnieks@vt.edu, Jiri Slaby <jirislaby@gmail.com>,
linux-mm@kvack.org, LKML <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: kswapd0: excessive CPU usage
Date: Sun, 04 Nov 2012 12:26:34 +0100 [thread overview]
Message-ID: <509650EA.5060508@redhat.com> (raw)
In-Reply-To: <509422C3.1000803@suse.cz>
Dne 2.11.2012 20:45, Jiri Slaby napsal(a):
> On 11/02/2012 11:53 AM, Jiri Slaby wrote:
>> On 11/02/2012 11:44 AM, Zdenek Kabelac wrote:
>>>>> Yes, applying this instead of the revert fixes the issue as well.
>>>
>>> I've applied this patch on 3.7.0-rc3 kernel - and I still see excessive
>>> CPU usage - mainly after suspend/resume
>>>
>>> Here is just simple kswapd backtrace from running kernel:
>>
>> Yup, this is what we were seeing with the former patch only too. Try to
>> apply the other one too:
>> https://patchwork.kernel.org/patch/1673231/
>>
>> For me I would say, it is fixed by the two patches now. I won't be able
>> to report later, since I'm leaving to a conference tomorrow.
>
> Damn it. It recurred right now, with both patches applied. After I
> started a java program which consumed some more memory. Though there are
> still 2 gigs free, kswap is spinning:
> [<ffffffff810b00da>] __cond_resched+0x2a/0x40
> [<ffffffff811318a0>] shrink_slab+0x1c0/0x2d0
> [<ffffffff8113478d>] kswapd+0x66d/0xb60
> [<ffffffff810a25d0>] kthread+0xc0/0xd0
> [<ffffffff816aa29c>] ret_from_fork+0x7c/0xb0
> [<ffffffffffffffff>] 0xffffffffffffffff
>
Yep - wanted to report myself again and noticed your replay.
Yes - I've now also both patches installed - and I still observe kswapd eating
my CPU. It seems (at least for me) that prior suspend and resume is way to
trigger it more frequently.
However there is a change in behaviour - while before kswapd was running
almost indefinitely now the> CPU spikes are in the range of minutes.
(i.e. uptime ~2days - kswapd has over 32minutes CPU time)
My machine has 4GB, and no swap (disabled)
firefox (22mins), thunderbird(3mins) and pidgin(0.5min) are the 3 most memory
and CPU hungry apps for this moment.
Zdenek
next prev parent reply other threads:[~2012-11-04 11:26 UTC|newest]
Thread overview: 100+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-11 8:52 kswapd0: wxcessive CPU usage Jiri Slaby
2012-10-11 8:52 ` Jiri Slaby
2012-10-11 13:44 ` Valdis.Kletnieks
2012-10-11 15:34 ` Jiri Slaby
2012-10-11 15:34 ` Jiri Slaby
2012-10-11 17:56 ` Valdis.Kletnieks
2012-10-11 17:59 ` Jiri Slaby
2012-10-11 17:59 ` Jiri Slaby
2012-10-11 18:19 ` Valdis.Kletnieks
2012-10-11 22:08 ` kswapd0: excessive " Jiri Slaby
2012-10-11 22:08 ` Jiri Slaby
2012-10-12 12:37 ` Jiri Slaby
2012-10-12 12:37 ` Jiri Slaby
2012-10-12 13:57 ` Mel Gorman
2012-10-12 13:57 ` Mel Gorman
2012-10-15 9:54 ` Jiri Slaby
2012-10-15 9:54 ` Jiri Slaby
2012-10-15 11:09 ` Mel Gorman
2012-10-15 11:09 ` Mel Gorman
2012-10-29 10:52 ` Thorsten Leemhuis
2012-10-29 10:52 ` Thorsten Leemhuis
2012-10-30 19:18 ` Mel Gorman
2012-10-30 19:18 ` Mel Gorman
2012-10-31 11:25 ` Thorsten Leemhuis
2012-10-31 11:25 ` Thorsten Leemhuis
2012-10-31 15:04 ` Mel Gorman
2012-10-31 15:04 ` Mel Gorman
2012-11-04 16:36 ` Rik van Riel
2012-11-04 16:36 ` Rik van Riel
2012-11-02 10:44 ` Zdenek Kabelac
2012-11-02 10:44 ` Zdenek Kabelac
2012-11-02 10:53 ` Jiri Slaby
2012-11-02 10:53 ` Jiri Slaby
2012-11-02 19:45 ` Jiri Slaby
2012-11-02 19:45 ` Jiri Slaby
2012-11-04 11:26 ` Zdenek Kabelac [this message]
2012-11-04 11:26 ` Zdenek Kabelac
2012-11-05 14:24 ` [PATCH] Revert "mm: vmscan: scale number of pages reclaimed by reclaim/compaction based on failures" Mel Gorman
2012-11-05 14:24 ` Mel Gorman
2012-11-06 10:15 ` Johannes Hirte
2012-11-06 10:15 ` Johannes Hirte
2012-11-09 8:36 ` Mel Gorman
2012-11-09 8:36 ` Mel Gorman
2012-11-14 21:43 ` Johannes Hirte
2012-11-14 21:43 ` Johannes Hirte
2012-11-09 9:12 ` Mel Gorman
2012-11-09 9:12 ` Mel Gorman
2012-11-09 4:22 ` kswapd0: excessive CPU usage Seth Jennings
2012-11-09 4:22 ` Seth Jennings
2012-11-09 8:07 ` Zdenek Kabelac
2012-11-09 8:07 ` Zdenek Kabelac
2012-11-09 9:06 ` Mel Gorman
2012-11-09 9:06 ` Mel Gorman
2012-11-11 9:13 ` Zdenek Kabelac
2012-11-11 9:13 ` Zdenek Kabelac
2012-11-12 11:37 ` [PATCH] Revert "mm: remove __GFP_NO_KSWAPD" Mel Gorman
2012-11-12 11:37 ` Mel Gorman
2012-11-16 19:14 ` Josh Boyer
2012-11-16 19:14 ` Josh Boyer
2012-11-16 19:51 ` Andrew Morton
2012-11-16 19:51 ` Andrew Morton
2012-11-20 1:43 ` Valdis.Kletnieks
2012-11-16 20:06 ` Mel Gorman
2012-11-16 20:06 ` Mel Gorman
2012-11-20 15:38 ` Josh Boyer
2012-11-20 15:38 ` Josh Boyer
2012-11-20 16:13 ` Bruno Wolff III
2012-11-20 16:13 ` Bruno Wolff III
2012-11-20 17:43 ` Thorsten Leemhuis
2012-11-20 17:43 ` Thorsten Leemhuis
2012-11-23 15:20 ` Thorsten Leemhuis
2012-11-23 15:20 ` Thorsten Leemhuis
2012-11-27 11:12 ` Mel Gorman
2012-11-27 11:12 ` Mel Gorman
2012-11-21 15:08 ` Mel Gorman
2012-11-21 15:08 ` Mel Gorman
2012-11-20 9:18 ` Glauber Costa
2012-11-20 9:18 ` Glauber Costa
2012-11-20 20:18 ` Andrew Morton
2012-11-20 20:18 ` Andrew Morton
2012-11-21 8:30 ` Glauber Costa
2012-11-21 8:30 ` Glauber Costa
2012-11-12 12:19 ` kswapd0: excessive CPU usage Mel Gorman
2012-11-12 12:19 ` Mel Gorman
2012-11-12 13:13 ` Zdenek Kabelac
2012-11-12 13:13 ` Zdenek Kabelac
2012-11-12 13:31 ` Mel Gorman
2012-11-12 13:31 ` Mel Gorman
2012-11-12 14:50 ` Zdenek Kabelac
2012-11-12 14:50 ` Zdenek Kabelac
2012-11-18 19:00 ` Zdenek Kabelac
2012-11-18 19:00 ` Zdenek Kabelac
2012-11-18 19:07 ` Jiri Slaby
2012-11-18 19:07 ` Jiri Slaby
2012-11-09 8:40 ` Mel Gorman
2012-11-09 8:40 ` Mel Gorman
2012-10-11 22:14 ` kswapd0: wxcessive " Andrew Morton
2012-10-11 22:14 ` Andrew Morton
2012-10-11 22:26 ` Jiri Slaby
2012-10-11 22:26 ` Jiri Slaby
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