linux-kernel - Re: [PATCH v7 11/18] perf tools: add mem access sampling core support

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Date:	Thu, 28 Mar 2013 12:12:48 -0300
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Jiri Olsa <jolsa@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>,
	Namhyung Kim <namhyung.kim@....com>
Subject: Re: [PATCH v7 11/18] perf tools: add mem access sampling core support

Em Thu, Mar 28, 2013 at 12:00:18PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Thu, Mar 28, 2013 at 03:24:30PM +0100, Stephane Eranian escreveu:
> > On Wed, Mar 27, 2013 at 5:56 PM, Arnaldo Carvalho de Melo
> > > Stephane, if you could give it a try again to see that the fixups I did
> > > (documented in the commit logs, just before my Signed-off-by) are ok,
> > > that would be good.
> 
> > I tried on a few examples on both NHM (only loads, no TLB) and SNB
> > and got the right answers for my tests, including data symbol resolution.
> 
> > What we discussed with Jiri yesterday can be added later on.
> 
> > Thanks for the integration work. Looks good to me.
> 
> Humm, I just tried it with a simple:
> 
> perf mem -t load rec
> 
> And got an OOPS, trying again, and this machine was suspended, perhaps
> perf/core doesn't have that PEBS fix, will check.

Yeah, after a fresh reboot it doesn't OOPses, the fix:

commit 1d9d8639c063caf6efc2447f5f26aa637f844ff6
Author: Stephane Eranian <eranian@...gle.com>
Date:   Fri Mar 15 14:26:07 2013 +0100

    perf,x86: fix kernel crash with PEBS/BTS after suspend/resume

--------

Isn't in perf/core, cool, before your test results I thougt I had messed
up something :-)

- Arnaldo
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