linux-kernel - Re: [patch] sched: fix single-depth wchan output

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Message-ID: <87mygco56h.fsf@basil.nowhere.org>
Date:	Thu, 06 Nov 2008 23:33:42 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Ken Chen <kenchen@...gle.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [patch] sched: fix single-depth wchan output

Ingo Molnar <mingo@...e.hu> writes:
>
> are you interested in adding /proc/<PID>/stacktrace? If yes then we 
> could remove fp generation for 64-bit right now and add your 
> stacktrace patch when you are done with it.

FWIW there used to be a patch floating around doing that a couple of
years ago and even used in some distros. But the big problem was if
someone read all of proc it took a lot of CPU time to do all the stack
tracing. This also was triggerable from non root.

So yes it's useful, but it can be costly.

-Andi

-- 
ak@...ux.intel.com
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