linux-kernel - Re: [2.6.34-git8][regression] massive polling problems with udevd and other processes

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Date:	Sat, 22 May 2010 14:10:07 -0700
From:	walt <w41ter@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: [2.6.34-git8][regression] massive polling problems with udevd
 and other processes

On 05/22/2010 01:44 PM, Al Viro wrote:
> On Sat, May 22, 2010 at 01:21:19PM -0700, walt wrote:
>> On 05/22/2010 12:35 PM, Shawn Starr wrote:
>>> Just built today's snapshot from linus's tree and have problems with udev
>>> using 100% cpu and KDE processes also pegging cpus.
>>>
>>> This is with Fedora 13 + snapshot kernel from git.
>>>
>>> Anyone else noticing this?
>>
>> Yes, just bisected it to this:
>>
>> commit a7cf4145bb86aaf85d4d4d29a69b50b688e2e49d
>> Author: Eric Paris<eparis@>
>> Date:   Fri May 14 11:44:10 2010 -0400
>>
>>      anon_inode: set S_IFREG on the anon_inode
>
> Cute...  Frankly, I'd be fine with just reverting that one and teaching
> selinux to STFU.  However, I wonder what specifically is getting polled.
> Which anon_inode users?
>
> Does anybody have strace handy?

I included only one of thousands of identical lines from strace of udevd at
the bottom of my previous post:

poll([{fd=4, events=POLLIN}, {fd=5, events=POLLIN}, {fd=6, events=POLLIN}, {fd=7, events=POLLIN}, {fd=8, events=POLLIN}], 5, -1) = 1 ([{fd=6, revents=POLLIN}])

Let me know if that's not what you need.

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