linux-kernel - Re: [PATCH 02/10] perf, tools, stat: Force --per-core mode for .agg-per-core aliases

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Message-ID: <20151221161419.GB21700@krava.brq.redhat.com>
Date:	Mon, 21 Dec 2015 17:14:19 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	acme@...nel.org, peterz@...radead.org, jolsa@...nel.org,
	mingo@...nel.org, linux-kernel@...r.kernel.org, eranian@...gle.com,
	namhyung@...nel.org, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 02/10] perf, tools, stat: Force --per-core mode for
 .agg-per-core aliases

On Tue, Dec 15, 2015 at 04:54:18PM -0800, Andi Kleen wrote:
> From: Andi Kleen <ak@...ux.intel.com>
> 
> When an event alias is used that the kernel marked as .agg-per-core, force
> --per-core mode (and also require -a and forbid cgroups or per thread mode).
> This in term means, --topdown forces --per-core mode.
> 
> This is needed for TopDown in SMT mode, because it needs to measure
> all threads in a core together and merge the values to compute the correct
> percentages of how the pipeline is limited.
> 
> We do this if any alias is agg-per-core.
> 
> Add the code to parse the .agg-per-core attributes and propagate
> the information to the evsel. Then the main stat code does
> the necessary checks and forces per core mode.
> 
> Open issue: in combination with -C ... we get wrong values. I think that's
> a existing bug that needs to be debugged/fixed separately.

could you please be more specific on what's failing for you?

thanks,
jirka
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