linux-kernel - Re: [tip:core/locking] x86/smp: Move waiting on contended ticket lock out of line

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Date:	Wed, 13 Feb 2013 17:46:52 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Rik van Riel <riel@...hat.com>
Cc:	Ingo Molnar <mingo@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>, aquini@...hat.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Michel Lespinasse <walken@...gle.com>,
	linux-tip-commits@...r.kernel.org,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [tip:core/locking] x86/smp: Move waiting on contended ticket lock
 out of line

On Wed, Feb 13, 2013 at 5:21 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> Now, on other machines you get the call chain even with pebs because
> you can get the whole

Oops, that got cut short early, because I started looking up when PEBS
and the last-branch-buffer work together, and couldn't find it, and
then came back to the email and forgot to finish the sentence.

Anyway: sometimes you get call chains with precise events, sometimes
you don't. And it turns out that I can't find out which cores do both,
and which ones don't.

                Linus
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