linux-kernel - Re: kswapd0: wxcessive CPU usage

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Message-Id: <20121011151413.3ab58542.akpm@linux-foundation.org>
Date:	Thu, 11 Oct 2012 15:14:13 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>,
	Jiri Slaby <jirislaby@...il.com>
Subject: Re: kswapd0: wxcessive CPU usage

On Thu, 11 Oct 2012 10:52:28 +0200
Jiri Slaby <jslaby@...e.cz> wrote:

> with 3.6.0-next-20121008, kswapd0 is spinning my CPU at 100% for 1
> minute or so. If I try to suspend to RAM, this trace appears:
> kswapd0         R  running task        0   577      2 0x00000000
>  0000000000000000 00000000000000c0 cccccccccccccccd ffff8801c4146800
>  ffff8801c4b15c88 ffffffff8116ee05 0000000000003e32 ffff8801c3a79000
>  ffff8801c4b15ca8 ffffffff8116fdf8 ffff8801c480f398 ffff8801c3a79000
> Call Trace:
>  [<ffffffff8116ee05>] ? put_super+0x25/0x40
>  [<ffffffff8116fdd4>] ? grab_super_passive+0x24/0xa0
>  [<ffffffff8116ff99>] ? prune_super+0x149/0x1b0
>  [<ffffffff81131531>] ? shrink_slab+0xa1/0x2d0
>  [<ffffffff8113452d>] ? kswapd+0x66d/0xb60
>  [<ffffffff81133ec0>] ? try_to_free_pages+0x180/0x180
>  [<ffffffff810a2770>] ? kthread+0xc0/0xd0
>  [<ffffffff810a26b0>] ? kthread_create_on_node+0x130/0x130
>  [<ffffffff816a6c9c>] ? ret_from_fork+0x7c/0x90
>  [<ffffffff810a26b0>] ? kthread_create_on_node+0x130/0x130

Could you please do a sysrq-T a few times while it's spinning, to
confirm that this trace is consistently the culprit?

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