linux-kernel - Re: [PATCH] proc: revert to show stack information in /proc/{pid}/status

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Date:	Fri, 01 Jan 2010 17:09:53 +0100
From:	Stefani Seibold <stefani@...bold.net>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Alexey Dobriyan <adobriyan@...il.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] proc: revert to show stack information in
 /proc/{pid}/status

Am Freitag, den 01.01.2010, 16:49 +0100 schrieb Andi Kleen:
> KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> writes:
> >
> > Anyway, I revert the regresstion patch as other regression patches. if you really want
> > this feature, you have three options.
> >
> >   1. create new /proc file instead to use /proc/pid/status.
> >   2. improve performance until typical use-case don't notice regression.
> >   3. change ps and other /proc related userland implementation and resubmit this patch.
> >
> > But even if you choose anything, You have to test both its functional and performance
> > _before_ submitting kernel patch.
> 
> 
> 4. Leave everything alone (revert all the commits) and use a ptrace
> based tool to get this information when you need it.
> 

Without the stack_start and the fix for the bogus x86_64 KSTP_ESP it
wouldn't be possible.


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