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

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Message-ID: <20081106065925.GE15731@elte.hu>
Date:	Thu, 6 Nov 2008 07:59:25 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Ken Chen <kenchen@...gle.com>
Cc:	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


* Ken Chen <kenchen@...gle.com> wrote:

> On Wed, Nov 5, 2008 at 10:30 PM, Ingo Molnar <mingo@...e.hu> wrote:
> > 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.
> 
> Yes, we had a patch internally at google to dump task stack trace 
> via procfs just like what you suggested.  I will get that patch out.

very nice!

If it does stack walking manually then please update it to use 
save_stack_trace() instead - that is the standard API that will 
utilize the best possible stack walking machinery on the architecture 
level.

For security reasons we want it to be admin-only readable, and we also 
want a .config for it for the extra paranoid and for CONFIG_EMBEDDED.

	Ingo
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