linux-kernel - Re: udevd high cpu hogging in kernel-2.6.34 git8 to git-13

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Message-ID: <4BFF5E3B.5060305@gmail.com>
Date:	Fri, 28 May 2010 08:10:03 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	JD <jd1008@...il.com>
CC:	Eric Paris <eparis@...hat.com>, Al Viro <viro@...iv.linux.org.uk>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: udevd high cpu hogging in kernel-2.6.34   git8 to git-13

Added lkml back to CC.

On 05/28/2010 08:06 AM, JD wrote:
> But here goes:
> I have seen this behaviour in all the git releases from git8
> to the current 2.6.34-git13
> 
> I have some of the analysis based on strace, and kernel stack
> trace.
> Instead of backing out the whole code for the new udevd, perhaps
> it (udevd) should sleep for some time before polling the same fd
> again.

So if you see in the strace output the poll to return immediately with
out fd being an anon_inode (check /proc/pid_of_udev/fd/), it is the
issue. AFAIK, it was not fixed upstream yet.

So could you try to revert a7cf4145b?

-- 
js
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