linux-kernel - Re: [patch 1/2] x86_64 page fault NMI-safe

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Message-ID: <1279150844.4190.29.camel@localhost>
Date:	Wed, 14 Jul 2010 19:40:44 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Christoph Hellwig <hch@....de>, Li Zefan <lizf@...fujitsu.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Johannes Berg <johannes.berg@...el.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Tom Zanussi <tzanussi@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andi Kleen <andi@...stfloor.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	"Frank Ch. Eigler" <fche@...hat.com>, Tejun Heo <htejun@...il.com>
Subject: Re: [patch 1/2] x86_64 page fault NMI-safe

[ /me removes the duplicate email of himself! ]

On Wed, 2010-07-14 at 19:11 -0400, Mathieu Desnoyers wrote:
> > 
> > So, when an event triggers in perf, we sometimes want to capture the stacktrace
> > that led to the event.
> > 
> > We want this stacktrace (here we call that a callchain) to be recorded
> > locklessly. So we want this callchain buffer per cpu, with the following
> > type:
> 
> Ah OK, so you mean that perf now has 2 different ring buffer implementations ?
> How about using a single one that is generic enough to handle perf and ftrace
> needs instead ?
> 
> (/me runs away quickly before the lightning strikes) ;)
> 

To be fair, that's just a temp buffer.

-- Steve

(/me sends this to try to remove the dup email he's getting )

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