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From: Jiri Slaby <jslaby@suse.cz>
To: linux-mm <linux-mm@kvack.org>
Cc: Mel Gorman <mgorman@suse.de>,
	Andrew Morton <akpm@linux-foundation.org>,
	Valdis Kletnieks <Valdis.Kletnieks@vt.edu>,
	LKML <linux-kernel@vger.kernel.org>,
	Rik van Riel <riel@redhat.com>
Subject: kswapd craziness round 2
Date: Sun, 17 Feb 2013 23:02:59 +0100	[thread overview]
Message-ID: <51215393.1070409@suse.cz> (raw)

Hi,

You still feel the sour taste of the "kswapd craziness in v3.7" thread,
right? Welcome to the hell, part two :{.

I believe this started happening after update from
3.8.0-rc4-next-20130125 to 3.8.0-rc7-next-20130211. The same as before,
many hours of uptime are needed and perhaps some suspend/resume cycles
too. Memory pressure is not high, plenty of I/O cache:
# free
             total       used       free     shared    buffers     cached
Mem:       6026692    5571184     455508          0     351252    2016648
-/+ buffers/cache:    3203284    2823408
Swap:            0          0          0

kswap is working very toughly though:
root       580  0.6  0.0      0     0 ?        S    úno12  46:21 [kswapd0]

This happens on I/O activity right now. For example by updatedb or find
/. This is what the stack trace of kswapd0 looks like:
[<ffffffff8113c431>] shrink_slab+0xa1/0x2d0
[<ffffffff8113ecd1>] kswapd+0x541/0x930
[<ffffffff810a3000>] kthread+0xc0/0xd0
[<ffffffff816beb5c>] ret_from_fork+0x7c/0xb0
[<ffffffffffffffff>] 0xffffffffffffffff

Any ideas?

thanks,
-- 
js
suse labs

WARNING: multiple messages have this Message-ID (diff)
From: Jiri Slaby <jslaby@suse.cz>
To: linux-mm <linux-mm@kvack.org>
Cc: Mel Gorman <mgorman@suse.de>,
	Andrew Morton <akpm@linux-foundation.org>,
	Valdis Kletnieks <Valdis.Kletnieks@vt.edu>,
	LKML <linux-kernel@vger.kernel.org>,
	Rik van Riel <riel@redhat.com>
Subject: kswapd craziness round 2
Date: Sun, 17 Feb 2013 23:02:59 +0100	[thread overview]
Message-ID: <51215393.1070409@suse.cz> (raw)

Hi,

You still feel the sour taste of the "kswapd craziness in v3.7" thread,
right? Welcome to the hell, part two :{.

I believe this started happening after update from
3.8.0-rc4-next-20130125 to 3.8.0-rc7-next-20130211. The same as before,
many hours of uptime are needed and perhaps some suspend/resume cycles
too. Memory pressure is not high, plenty of I/O cache:
# free
             total       used       free     shared    buffers     cached
Mem:       6026692    5571184     455508          0     351252    2016648
-/+ buffers/cache:    3203284    2823408
Swap:            0          0          0

kswap is working very toughly though:
root       580  0.6  0.0      0     0 ?        S    uno12  46:21 [kswapd0]

This happens on I/O activity right now. For example by updatedb or find
/. This is what the stack trace of kswapd0 looks like:
[<ffffffff8113c431>] shrink_slab+0xa1/0x2d0
[<ffffffff8113ecd1>] kswapd+0x541/0x930
[<ffffffff810a3000>] kthread+0xc0/0xd0
[<ffffffff816beb5c>] ret_from_fork+0x7c/0xb0
[<ffffffffffffffff>] 0xffffffffffffffff

Any ideas?

thanks,
-- 
js
suse labs

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             reply	other threads:[~2013-02-17 22:03 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-02-17 22:02 Jiri Slaby [this message]
2013-02-17 22:02 ` kswapd craziness round 2 Jiri Slaby
2013-02-18  6:18 Daniel J Blueman
2013-02-18 11:42 ` Hillf Danton
2013-02-18 15:05   ` Daniel J Blueman
2013-02-20 22:14   ` Jiri Slaby
2013-02-21 12:07     ` Hillf Danton
2013-02-24 21:27       ` Jiri Slaby
2013-02-28 17:02       ` Jiri Slaby
2013-03-01 14:02         ` Hillf Danton
2013-03-07 19:37           ` Jiri Slaby
2013-03-08  6:42             ` Hillf Danton
2013-03-08  6:42               ` Hillf Danton
2013-03-08  7:29               ` Zlatko Calusic
2013-03-08  7:29                 ` Zlatko Calusic
2013-03-08  8:27                 ` Hillf Danton
2013-03-08  8:27                   ` Hillf Danton
2013-03-08 23:21               ` Jiri Slaby
2013-03-08 23:21                 ` Jiri Slaby
2013-03-19 16:59                 ` Pádraig Brady
2013-03-19 16:59                   ` Pádraig Brady
2013-03-20  4:12                   ` Hillf Danton
2013-03-20  4:12                     ` Hillf Danton
2013-03-20  8:39                     ` Jiri Slaby
2013-03-20  8:39                       ` Jiri Slaby

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