Message-ID: <1424368901.16038.15.camel@arm.com>
Subject: Re: [PATCH 0/2] perf/x86: Add ability to sample TSC
From: Pawel Moll <pawel.moll@arm.com>
To: John Stultz <john.stultz@linaro.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>,
        Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@redhat.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        lkml <linux-kernel@vger.kernel.org>, David Ahern <dsahern@gmail.com>,
        Frederic Weisbecker <fweisbec@gmail.com>, Jiri Olsa <jolsa@redhat.com>,
        Namhyung Kim <namhyung@gmail.com>, Paul Mackerras <paulus@samba.org>,
        Stephane Eranian <eranian@google.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Steven Rostedt <rostedt@goodmis.org>, Andi Kleen <ak@linux.intel.com>,
        Mathieu Poirier <mathieu.poirier@linaro.org>
Date: Thu, 19 Feb 2015 18:01:41 +0000
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On Thu, 2015-02-19 at 17:58 +0000, Pawel Moll wrote:
> and what Adrian did, explicitly
> defining possible timestamps at perf_event_attr level instead of
> relating them to to posix clock ids is the way to go. No strong opinion
> here.

One note here: I'd rather make it "processor trace clock", rather than
"architecturally defined" one. That way you relate it directly to the
time domain and allow userspace decoder to as for it in a
architecturally independent way (yes, I'm assuming that there will be
only one "type of processor trace in a system :-)

Pawel

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