From: Andi Kleen <andi@firstfloor.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: Ken Chen <kenchen@google.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Steven Rostedt <rostedt@goodmis.org>
Subject: Re: [patch] sched: fix single-depth wchan output
Date: Thu, 06 Nov 2008 23:33:42 +0100 [thread overview]
Message-ID: <87mygco56h.fsf@basil.nowhere.org> (raw)
In-Reply-To: <20081106063012.GA15731@elte.hu> (Ingo Molnar's message of "Thu, 6 Nov 2008 07:30:12 +0100")
Ingo Molnar <mingo@elte.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@linux.intel.com
next prev parent reply other threads:[~2008-11-06 22:33 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-06 5:58 [patch] sched: fix single-depth wchan output Ken Chen
2008-11-06 6:11 ` Ingo Molnar
2008-11-06 6:16 ` Ken Chen
2008-11-06 6:30 ` Ingo Molnar
2008-11-06 6:42 ` Ken Chen
2008-11-06 6:59 ` Ingo Molnar
2008-11-06 7:28 ` Ken Chen
2008-11-06 7:44 ` Ingo Molnar
2008-11-06 22:33 ` Andi Kleen [this message]
2008-11-06 21:56 ` Matt Mackall
2008-11-06 22:30 ` Chris Friesen
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