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

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Message-ID: <CABPqkBTQCce3ve9cP-Ajbtb7FSVggB_bL7Dmpq8KeG_7Gfx0Og@mail.gmail.com>
Date:	Thu, 14 Mar 2013 23:53:37 +0100
From:	Stephane Eranian <eranian@...gle.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
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 11:42 PM, Stephane Eranian <eranian@...gle.com> wrote:
> On Thu, Mar 14, 2013 at 11:19 PM, Stephane Eranian <eranian@...gle.com> wrote:
>> On Thu, Mar 14, 2013 at 11:17 PM, Linus Torvalds
>> <torvalds@...ux-foundation.org> wrote:
>>> 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.
>>>
>> Ok, simpler test case then.
>>
>>>> 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.
>>>
>> Will try on a desktop IvyBridge too.
>
> Ok, it happens on my IVB desktop too, so I can investigate...

It's not specific to IVB either, it hangs on my Nehalem desktop as well.
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