linux-kernel - Re: [PATCH] perf stat: fix per-pkg event reporting bug

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Message-ID: <20150902202657.GC4524@tassilo.jf.intel.com>
Date:	Wed, 2 Sep 2015 13:26:57 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, acme@...hat.com,
	peterz@...radead.org, mingo@...e.hu, jolsa@...hat.com,
	namhyung@...nel.org, kan.liang@...el.com, dsahern@...il.com,
	adrian.hunter@...el.com
Subject: Re: [PATCH] perf stat: fix per-pkg event reporting bug

On Wed, Sep 02, 2015 at 03:17:51PM +0200, Stephane Eranian wrote:
> Per-pkg events need to be captured once per processor
> socket. The code in check_per_pkg() ensures only one
> value per processor package is used. However there is
> a problem with this function in case the first CPU of
> the package does not measure anything for the per-pkg event,
> but other CPUs do.

I've seen a similar(?) bug with -C and --per-core combined.
Some logical threads are not correctly accounted there either.
Do you think that's another instance of such a bug?

-Andi
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