linux-kernel - Re: [BUG] perf stat: explicit grouping yields unexpected results

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Message-ID: <20131115100506.GD2965@twins.programming.kicks-ass.net>
Date:	Fri, 15 Nov 2013 11:05:06 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Stephane Eranian <eranian@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jiri Olsa <jolsa@...hat.com>, "mingo@...e.hu" <mingo@...e.hu>,
	David Ahern <dsahern@...il.com>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Namhyung Kim <namhyung.kim@....com>
Subject: Re: [BUG] perf stat: explicit grouping yields unexpected results

On Fri, Nov 15, 2013 at 07:34:57AM +0100, Ingo Molnar wrote:
> Btw., does the kernel side currently support discovery of such 
> impossible group scheduling constraints at group setup time? 

Up to a point.

> If not 
> then it probably should and it should reject them straight away.

We do I think, for the case where its obvious it can never fit.

That said, if you have a pinned cpu event, it all comes apart.
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