From: Milian Wolff <mail@milianw.de>
To: linux-perf-users@vger.kernel.org
Subject: task-clock vs. cpu-clock; per-event documentation
Date: Wed, 05 Aug 2015 14:55:11 +0200 [thread overview]
Message-ID: <1472439.mytDSkIAAG@milian-kdab2> (raw)
Hello all,
I was asked by a colleague of mine what the difference between task-clock and
cpu-clock is. I found many similar questions on the web, but none have a final
answer:
http://stackoverflow.com/questions/23965363/linux-perf-events-cpu-clock-and-task-clock-what-is-the-difference
https://lkml.org/lkml/2010/11/3/373
Could someone explain the difference between the two counters for a non-kernel
person? What is a task for that matter? When I compare the counters on test
applications, they deviate only marginally.
In general, is there hope for more documentation on the individual performance
counters? Perf list shows what's available but has no information whatsoever
about the actual meaning of the counters. It would be excellent to also
explain how to interpret the counter, or in what case you'd want to look at a
given event.
Thanks
--
Milian Wolff
mail@milianw.de
http://milianw.de
next reply other threads:[~2015-08-05 12:55 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-05 12:55 Milian Wolff [this message]
2015-08-05 13:07 ` task-clock vs. cpu-clock; per-event documentation Andreas Hollmann
2015-08-05 13:38 ` Milian Wolff
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