linux-kernel - Re: [RFCv2 3/4] perf: util: only open events on CPUs an evsel permits

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Date:	Mon, 18 Jul 2016 19:46:04 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Mark Rutland <mark.rutland@....com>, linux-kernel@...r.kernel.org,
	adrian.hunter@...el.com, alexander.shishkin@...ux.intel.com,
	hekuang@...wei.com, jolsa@...nel.org, kan.liang@...el.com,
	mingo@...hat.com, peterz@...radead.org, wangnan0@...wei.com
Subject: Re: [RFCv2 3/4] perf: util: only open events on CPUs an evsel permits

Em Mon, Jul 18, 2016 at 04:32:59PM +0200, Jiri Olsa escreveu:
> On Fri, Jul 15, 2016 at 11:08:12AM +0100, Mark Rutland wrote:
> > In systems with heterogeneous CPU PMUs, it's possible for each evsel to
> > cover a distinct set of CPUs, and hence the cpu_map associated with each
> > evsel may have a distinct idx<->id mapping. Any of these may be distinct from
> > the evlist's cpu map.
> > 
> > Events can be tied to the same fd so long as they use the same per-cpu
> > ringbuffer (i.e. so long as they are on the same CPU). To acquire the
> > correct FDs, we must compare the Linux logical IDs rather than the evsel
> > or evlist indices.
> > 
> > This path adds logic to perf_evlist__mmap_per_evsel to handle this,
> > translating IDs as required. As PMUs may cover a subset of CPUs from the
> > evlist, we skip the CPUs a PMU cannot handle.
> > 
> > Signed-off-by: Mark Rutland <mark.rutland@....com>
> > Cc: Adrian Hunter <adrian.hunter@...el.com>
> > Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
> > Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
> > Cc: He Kuang <hekuang@...wei.com>
> > Cc: Ingo Molnar <mingo@...hat.com>
> > Cc: Jiri Olsa <jolsa@...nel.org>
> > Cc: Peter Zijlstra <peterz@...radead.org>
> > Cc: Wang Nan <wangnan0@...wei.com>
> > Cc: linux-kernel@...r.kernel.org
> 
> Acked-by: Jiri Olsa <jolsa@...nel.org>

Applied the first two, this one is not applying, please check my
perf/core branch, what is there should soon be pushed to Ingo, so
tip/perf/core may be ok too.

- Arnaldo