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

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Date:	Tue, 11 Nov 2008 15:03:27 +0100
From:	Mikael Pettersson <mikpe@...uu.se>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Marcin Slusarz <marcin.slusarz@...il.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ken Chen <kenchen@...gle.com>, 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

Ingo Molnar writes:
 > > >  # cat /proc/18579/stack
 > > >  [<ffffffffffffffff>] 0xffffffffffffffff
 > > 
 > > so this file provides view of _kernel_ stack only?
 > > shouldn't it be named kernel-stack then?
 > 
 > it prints the kernel stack right now, but i'd not restrict it to the 
 > kernel stack conceptually: i think we could eventually expand it to 
 > print the user-space portion of the stack as well. (in the case when 
 > user-space is built with frame pointers) We've got code for that in 
 > the kernel already. It would be an easy one-stop-shop for full-range.

That would be quite fragile given the fact that user-space
only has to follow standard ABIs at specific points like
calls to standard library functions. In between, anything
can, and does, happen.
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