From: Andi Kleen <andi@firstfloor.org>
To: Namhyung Kim <namhyung@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>,
Ingo Molnar <mingo@kernel.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Jiri Olsa <jolsa@redhat.com>, LKML <linux-kernel@vger.kernel.org>,
David Ahern <dsahern@gmail.com>,
Stephane Eranian <eranian@google.com>,
Andi Kleen <andi@firstfloor.org>,
Minchan Kim <minchan@kernel.org>
Subject: Re: [RFC/PATCH v2] perf data: Add stat subcommand to show sample event stat
Date: Mon, 11 May 2015 17:44:05 +0200 [thread overview]
Message-ID: <20150511154405.GV2366@two.firstfloor.org> (raw)
In-Reply-To: <1431357915-10218-1-git-send-email-namhyung@kernel.org>
> The sampling ratio was useful for me to determine how often the event
> was sampled - in this case the cpu cycles event was only sampled at 12%
That's dangerous to determine without a plot. It could be that it was bimodal:
100% busy and then idle. You may want to add something like the spark
plots I submitted for stat some time ago.
-Andi
next prev parent reply other threads:[~2015-05-11 15:44 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-11 15:25 [RFC/PATCH v2] perf data: Add stat subcommand to show sample event stat Namhyung Kim
2015-05-11 15:44 ` Andi Kleen [this message]
2015-05-13 12:05 ` Namhyung Kim
2015-05-14 19:32 ` Andi Kleen
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