linux-kernel - Re: [patch] add /proc/pid/stack to dump task's stack trace

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Message-ID: <20081109180841.GB3127@x200.localdomain>
Date:	Sun, 9 Nov 2008 21:08:41 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Ken Chen <kenchen@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [patch] add /proc/pid/stack to dump task's stack trace

On Sat, Nov 08, 2008 at 01:10:54PM +0100, Ingo Molnar wrote:
> Sidenote: it would still be nice if the procfs folks converted the 
> old-style code there to the new seqfile APIs, before requiring 
> everyone _else_ to follow those guidelines?

For every existing non seqfile /proc file, there may be (and was demonstrated)
some userspace which is doing pread(2) on it and seqfiles don't support pread
currently. Obviously, no such userspace exist for /proc/*/stack.
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