linux-kernel - Re: [GIT PULL] perf fixes

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Message-ID: <CA+55aFzDMwHyPxqxNKRz0Y3vFhZOqtHMvPbvNXAD6C+-_=UAhg@mail.gmail.com>
Date:	Thu, 14 Mar 2013 15:17:19 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [GIT PULL] perf fixes

On Thu, Mar 14, 2013 at 3:09 PM, Stephane Eranian <eranian@...gle.com> wrote:
>
> Could be related to suspend/resume. But were you running perf across
> that resume/suspend cycle?

No.

In most cases I was running a perf record before and after (but not
*while* suspending)

In at least one other crash, I didn't run perf before at all, so the
first time I used perf was after the resume.

So in no cases did I actually have any perf stuff active over the
suspend itself.

> Let's see if we can reproduce the problem on the same ChromeBook you
> have. Don't have one myself.

I don't imagine it should be about chromebook per se, because afaik
all of pmu suspend/resume is done by the kernel, no firmware involved.

So I'd assume it should happen with any IvyBridge.

            Linus
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