linux-kernel - Re: [PATCH 6/8] perf: Account freq events per cpu

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Message-ID: <20130801144005.GG27162@twins.programming.kicks-ass.net>
Date:	Thu, 1 Aug 2013 16:40:05 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Jiri Olsa <jolsa@...hat.com>, LKML <linux-kernel@...r.kernel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 6/8] perf: Account freq events per cpu

On Thu, Aug 01, 2013 at 04:21:11PM +0200, Frederic Weisbecker wrote:
> > > Yeah, just go with a single global state for now..
> > 
> > The perf default is to create inherited counter, which are per cpu
> > anyway. So we'll not loose much.
> 
> So you mean that I keep the per cpu state when event->cpu != -1 and also have
> a global counter for the others. Right?

No, only a single global counter. The fact that perf, by default,
creates a counter per cpu, means that there's little effective
difference between a single global counter and per-cpu counters.
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