linux-kernel - Re: Why is kslowd accumulating so much CPU time?

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Message-ID: <AANLkTilZElLEBJDjfpZVx72uDR-x_3t14Jkga5eHy3wf@mail.gmail.com>
Date:	Wed, 16 Jun 2010 12:37:22 +0100
From:	Andy Whitcroft <apw@...onical.com>
To:	David Howells <dhowells@...hat.com>
Cc:	tytso@....edu, Dave Airlie <airlied@...il.com>,
	Dave Airlie <airlied@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: Why is kslowd accumulating so much CPU time?

> Can you see what they're doing?
>
>        watch -n0 cat /sys/kernel/debug/slow_work/runqueue

Turned on the debugging and applied the patch from Ted, and when
things are bad I see constant cycling of all four threads in the
output showing similar to the below, note only one thread shows at a
time:

Every 0.1s: cat /sys/kernel/debug/slow_work/runqueue    Wed Jun 16 12:34:52 2010

THR PID   ITEM ADDR        FL MARK  DESC
=== ===== ================ == ===== ==========
   0   897 ffff88012bb07510 12  20ms DRM_CRTC_HELPER: i915@pci:0000:00:02.0

When things are working well I see the same output appearing for one
update, about every 10s.

-apw
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