linux-kernel - Re: Detailed Stack Information Patch [2/3]

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Message-ID: <18901.48028.862826.66492@pilspetsen.it.uu.se>
Date:	Fri, 3 Apr 2009 09:32:44 +0200
From:	Mikael Pettersson <mikpe@...uu.se>
To:	Stefani Seibold <stefani@...bold.net>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Joerg Engel <joern@...fs.org>
Subject: Re: Detailed Stack Information Patch [2/3]

Stefani Seibold writes:
 > I think a user space daemon will be the a good way if the /proc/*/maps
 > or /proc/*/stack will provide the following information:
 > 
 > - start address of the stack
 > - current address of the stack pointer
 > - highest used address in the stack

You're assuming
1. a thread has exactly one stack
2. the stack is a single unbroken area
3. the kernel knows the location of this area

None of these assumptions are necessarily valid, esp. in
the presence of virtualizers, managed runtimes, or mixed
interpreted/JIT language implementations.
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