From: Peter Zijlstra <peterz@infradead.org>
To: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Arnaldo Carvalho de Melo <acme@redhat.com>,
Jiri Olsa <jolsa@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
LKML <linux-kernel@vger.kernel.org>,
John Stultz <john.stultz@linaro.org>,
"H. Peter Anvin" <hpa@zytor.com>, David Ahern <dsahern@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
Ingo Molnar <mingo@kernel.org>
Subject: Re: [tip:perf/timer] perf: Add per event clockid support
Date: Fri, 27 Mar 2015 17:57:39 +0100 [thread overview]
Message-ID: <20150327165739.GJ23123@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <CABPqkBT-H8T40FcDZAWahMAajP4NBbMOVs9Awghh598xaoiz9Q@mail.gmail.com>
On Fri, Mar 27, 2015 at 09:52:25AM -0700, Stephane Eranian wrote:
> Ok, I see. But on architectures which do not have NMI, they would all
> be safe. And that would work if they set the PERF_PMU_CAP_NO_NMI flag
> on their pmu->capabilities.
Indeed so. I have not audited them all as the current 'default' is safe.
> Next, I am trying to understand how perf is going to expose this. I am
> thinking about this in the context of my jitted code patches.
I send you some preliminary patches for this.
> With this approach, the jit runtime and the perf tool need to agree on
> the clock they are using. That mean they need to advertise or document
> the clock they use
This is indeed still missing, I put an XXX question in one of the
emails to this effect. I suppose we should store the used clockid in the
data file. I just haven't figured out how all that code works.
> and there needs to be an option in perf record to pass that same
> clockid.
I did indeed post a patch to do that.
next prev parent reply other threads:[~2015-03-27 16:57 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <tip-34f439278cef7b1177f8ce24f9fc81dfc6221d3b@git.kernel.org>
2015-03-27 14:32 ` [PATCH] perf, record: Add clockid parameter Peter Zijlstra
2015-03-27 17:11 ` David Ahern
2015-03-27 17:20 ` Peter Zijlstra
2015-03-27 17:35 ` David Ahern
2015-03-27 20:15 ` Arnaldo Carvalho de Melo
2015-03-27 21:59 ` Peter Zijlstra
2015-03-27 22:37 ` Stephane Eranian
2015-03-28 7:55 ` Peter Zijlstra
2015-03-30 1:00 ` David Ahern
2015-03-30 8:24 ` Peter Zijlstra
2015-03-30 17:11 ` David Ahern
2015-03-30 9:17 ` Peter Zijlstra
2015-03-30 17:17 ` David Ahern
2015-03-30 19:32 ` Peter Zijlstra
2015-03-30 19:39 ` David Ahern
2015-03-30 17:24 ` David Ahern
2015-03-30 19:33 ` Peter Zijlstra
2015-03-30 19:41 ` David Ahern
2015-03-30 19:43 ` Stephane Eranian
2015-03-31 8:19 ` Peter Zijlstra
2015-03-31 10:46 ` [RFC][PATCH] perf tools: unify perf_event_attr printing Peter Zijlstra
2015-04-01 16:26 ` Peter Zijlstra
2015-04-01 16:52 ` Jiri Olsa
2015-04-02 9:01 ` Adrian Hunter
2015-04-02 11:59 ` Peter Zijlstra
2015-04-02 12:54 ` Adrian Hunter
2015-04-03 16:11 ` Arnaldo Carvalho de Melo
2015-04-03 16:14 ` Arnaldo Carvalho de Melo
2015-04-02 8:12 ` Ingo Molnar
2015-04-02 22:28 ` Arnaldo Carvalho de Melo
2015-04-02 9:19 ` Jiri Olsa
2015-03-30 17:33 ` [PATCH] perf, record: Add clockid parameter David Ahern
2015-03-30 19:34 ` Peter Zijlstra
2015-03-30 19:46 ` David Ahern
2015-03-27 23:07 ` Stephane Eranian
2015-03-27 16:31 ` [tip:perf/timer] perf: Add per event clockid support Stephane Eranian
2015-03-27 16:35 ` Peter Zijlstra
2015-03-27 16:52 ` Stephane Eranian
2015-03-27 16:57 ` Peter Zijlstra [this message]
2015-03-27 17:00 ` Stephane Eranian
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