linux-kernel - Re: [Bug #12208] uml is very slow on 2.6.28 host

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Message-Id: <1229494628.5280.24.camel@marge.simson.net>
Date:	Wed, 17 Dec 2008 07:17:08 +0100
From:	Mike Galbraith <efault@....de>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	rjw@...k.pl, a.p.zijlstra@...llo.nl, mingo@...e.hu,
	linux-kernel@...r.kernel.org, kernel-testers@...r.kernel.org
Subject: Re: [Bug #12208] uml is very slow on 2.6.28 host

On Tue, 2008-12-16 at 16:27 +0100, Miklos Szeredi wrote:

> Is there a way to trace what is happening in the scheduler?

Sure.  Ingo has a script for gathering info (attached), if you run it,
please gzip up the output and send me a copy offline to eyeball.

There's also ftrace, but I've not tried that yet, so can't offer any
advice, I use primitive but effective time_after() + printk() with klogd
wakeup disabled (deadlock).

	-Mike

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