From: Peter Zijlstra <peterz@infradead.org>
To: Jiri Olsa <jolsa@redhat.com>
Cc: linux-kernel@vger.kernel.org,
Corey Ashford <cjashfor@linux.vnet.ibm.com>,
Frederic Weisbecker <fweisbec@gmail.com>,
Ingo Molnar <mingo@elte.hu>, Namhyung Kim <namhyung@kernel.org>,
Paul Mackerras <paulus@samba.org>,
Arnaldo Carvalho de Melo <acme@redhat.com>,
Andi Kleen <ak@linux.intel.com>, David Ahern <dsahern@gmail.com>,
Stephane Eranian <eranian@google.com>
Subject: Re: [PATCH 0/9] perf: Adding better precise_ip field handling
Date: Fri, 10 May 2013 11:53:45 +0200 [thread overview]
Message-ID: <20130510095345.GG3039@dyad.programming.kicks-ass.net> (raw)
In-Reply-To: <20130510094053.GF1040@krava.brq.redhat.com>
On Fri, May 10, 2013 at 11:40:53AM +0200, Jiri Olsa wrote:
> nope, but I need a automated way to find out if PEBS
> is supported in system
Create an event, see what happens ;-) But I suppose you want to know if it
should have worked vs does it actually work? Yeah, I suppose what you did
is the right thing there.
I was just completely missing the rationale earlier.
> > > having maximum precise enabled with just single 'p' seemed
> > > like good idea
> >
> > Doesn't seem like to me; that takes away the possibility to use less.
>
> hm, we could have another modifier to get system precise value
> 'P' maybe.. and keep the 'p' logic
That might be a possibility indeed.
> > Also, you really don't need the max_precise for that either. At worst you'll
> > have a number of unsuccessful event creations.
>
> so you mean just detect that by opening events with increasing
> precise and see how far we could get.. could be I guess, though
> the 'precise' sysfs attribute seems more fit to me
The other way around, start at ppp end at !p, then use the one that worked.
next prev parent reply other threads:[~2013-05-10 9:55 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-09 13:32 [PATCH 0/9] perf: Adding better precise_ip field handling Jiri Olsa
2013-05-09 13:32 ` [PATCH 1/9] perf x86: Add precise sysfs cpu pmu attribute Jiri Olsa
2013-05-09 13:32 ` [PATCH 2/9] perf tools: Add precise object to interface sysfs precise Jiri Olsa
2013-05-10 1:34 ` Namhyung Kim
2013-05-10 9:06 ` Jiri Olsa
2013-05-09 13:32 ` [PATCH 3/9] perf tests: Add precise event automated test Jiri Olsa
2013-05-09 13:32 ` [PATCH 4/9] perf tools: Add a precise event qualifier Jiri Olsa
2013-05-10 1:43 ` Namhyung Kim
2013-05-10 9:10 ` Jiri Olsa
2013-05-09 13:32 ` [PATCH 5/9] perf tools: Set maximum precise value for event 'p' modifier Jiri Olsa
2013-05-09 19:43 ` David Ahern
2013-05-10 9:12 ` Jiri Olsa
2013-05-10 1:53 ` Namhyung Kim
2013-05-10 9:16 ` Jiri Olsa
2013-05-09 13:32 ` [PATCH 6/9] perf tools: Set maximum precise value for 'precise' term Jiri Olsa
2013-05-09 13:32 ` [PATCH 7/9] perf tests: Add automated precise term test Jiri Olsa
2013-05-09 13:32 ` [PATCH 8/9] perf: Document the ABI for 'precise' sysfs attribute Jiri Olsa
2013-05-10 1:57 ` Namhyung Kim
2013-05-09 13:32 ` [PATCH 9/9] perf: Document the ABI for 'rdpmc' " Jiri Olsa
2013-05-09 15:07 ` [PATCH 0/9] perf: Adding better precise_ip field handling Peter Zijlstra
2013-05-09 15:20 ` Jiri Olsa
2013-05-10 9:27 ` Peter Zijlstra
2013-05-10 9:40 ` Jiri Olsa
2013-05-10 9:53 ` Peter Zijlstra [this message]
2013-05-10 10:18 ` Ingo Molnar
2013-05-10 10:22 ` Peter Zijlstra
2013-05-10 10:31 ` Ingo Molnar
2013-05-10 10:34 ` Peter Zijlstra
2013-05-10 10:55 ` Ingo Molnar
2013-05-10 11:27 ` Peter Zijlstra
2013-05-11 7:50 ` Ingo Molnar
2013-05-13 9:36 ` Peter Zijlstra
2013-05-13 19:43 ` Ingo Molnar
2013-05-14 7:22 ` Peter Zijlstra
2013-05-14 8:37 ` Ingo Molnar
2013-05-14 8:36 ` Gleb Natapov
2013-05-15 13:27 ` Stephane Eranian
2013-05-28 9:54 ` Ingo Molnar
2013-05-10 9:29 ` Peter Zijlstra
2013-05-10 9:43 ` Jiri Olsa
-- strict thread matches above, loose matches on Subject: below --
2013-01-26 17:27 Jiri Olsa
2013-01-26 18:53 ` Jiri Olsa
2013-01-27 12:41 ` Ingo Molnar
2013-01-27 12:57 ` Jiri Olsa
2013-01-27 13:02 ` Ingo Molnar
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