linux-kernel - Re: [PATCH 1/1] perf, tool: partial callgrap and time support in perf record

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Date:	Wed, 18 Mar 2015 12:18:25 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	"Liang, Kan" <kan.liang@...el.com>,
	"acme@...nel.org" <acme@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"eranian@...gle.com" <eranian@...gle.com>, jolsa@...nel.org
Subject: Re: [PATCH 1/1] perf, tool: partial callgrap and time support in
 perf record

> > The answer is no: it solves a different problem. Group read 
> > is just fine granuality counting. It cannot be used
> > to sample for multiple events in parallel.
> 
> But group read disables sampling for non-leader events so the number
> of total samples should be small, no?

Yes it's smaller, but it doesn't sample everything.

-Andi
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