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Subject: Re: [patch 1/2] x86_64 page fault NMI-safe
From: Steven Rostedt <rostedt@goodmis.org>
To: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Ingo Molnar <mingo@elte.hu>, LKML <linux-kernel@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Thomas Gleixner <tglx@linutronix.de>, Christoph Hellwig <hch@lst.de>,
        Li Zefan <lizf@cn.fujitsu.com>, Lai Jiangshan <laijs@cn.fujitsu.com>,
        Johannes Berg <johannes.berg@intel.com>,
        Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
        Arnaldo Carvalho de Melo <acme@infradead.org>,
        Tom Zanussi <tzanussi@gmail.com>,
        KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
        Andi Kleen <andi@firstfloor.org>, "H. Peter Anvin" <hpa@zytor.com>,
        Jeremy Fitzhardinge <jeremy@goop.org>,
        "Frank Ch. Eigler" <fche@redhat.com>, Tejun Heo <htejun@gmail.com>
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Date: Wed, 14 Jul 2010 19:40:44 -0400
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[ /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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