linux-kernel - Re: [PATCH V4 18/24] perf tools: Add Intel BTS support

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Message-ID: <20150508194122.GR7862@kernel.org>
Date:	Fri, 8 May 2015 16:41:22 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...il.com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH V4 18/24] perf tools: Add Intel BTS support

Em Thu, May 07, 2015 at 10:05:28AM +0300, Adrian Hunter escreveu:
> On 06/05/15 16:35, Arnaldo Carvalho de Melo wrote:
> > Em Wed, May 06, 2015 at 10:14:36AM +0300, Adrian Hunter escreveu:
> >> Perhaps we should disallow intel_bts and intel_pt PMU events
> >> explicitly and put that change back to v4.1 stable at least?
> >>
> >> I tried adding:
> >>
> >> diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
> >> index 244c66f..5d3ab7c 100644
> >> --- a/tools/perf/util/pmu.c
> >> +++ b/tools/perf/util/pmu.c
> >> @@ -442,6 +442,10 @@ static struct perf_pmu *pmu_lookup(const char *name)
> >>         LIST_HEAD(aliases);
> >>         __u32 type;
> >>  
> >> +       /* No support for intel_bts or intel_pt so disallow them */
> >> +       if (!strcmp(name, "intel_bts") || !strcmp(name, "intel_pt"))
> >> +               return NULL;
> >> +
> >>         /*
> >>          * The pmu data we store & need consists of the pmu
> >>          * type value and format definitions. Load both right
> >>
> >>
> >> And now I get:
> >>
> >> $ tools/perf/perf record -e intel_bts//u ls
> >> invalid or unsupported event: 'intel_bts//u'
> >> Run 'perf list' for a list of valid events
> > 
> > Unsure, when did we start accepting intel_bts in event names? In this patchkit?
> 
> Any old version of perf tools will accept PMU names as events. It validates
> against /sys/bus/event_source/devices.
> 
> So "intel_pt" and "intel_bts" will turn up in v4.1, so I was suggesting
> disallowing them in perf tools for v4.1 since there is no tool support until
> v4.2.

Well, please add that to some patchkit after I process the current set
of patches, which I'll try to after pushing a batch that I have, to
avoid spamming lkml too much each time :-)

- Arnaldo
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