From: Chulmin Kim <cmkim@core.kaist.ac.kr>
To: linux-perf-users@vger.kernel.org
Cc: Ryan Johnson <ryan.johnson@cs.utoronto.ca>
Subject: Re: perf top -z not working?
Date: Wed, 17 Oct 2012 22:49:42 +0900 [thread overview]
Message-ID: <507EB776.9030304@core.kaist.ac.kr> (raw)
In-Reply-To: <507EA40D.60206@cs.utoronto.ca>
2012-10-17 오후 9:26, Ryan Johnson 쓴 글:
> Hi,
>
> (Please CC me in replies, not a list member)
>
> It seems that `perf top -z' does not behave as advertized, at least
> not on the 3.2.0-25 kernel (Ubuntu) that I'm running. The man page
> states that it should "zero history across display updates" but the
> counts still seem to accumulate (the total samples reported rises
> monotonically) and processes still show up in the display long after
> they have exited. Pressing `z' or `Z' seems to have no effect, either.
My kernel version is 3.0.0 (ubuntu 11.10).
Mine seems to work well. The result was not the accumulated one,
definitely.
In my opinion, it is a buf in the perf tool in that kernel version.
>
> Have I misunderstood this feature, or is this a bug that has perhaps
> been fixed in later kernel versions? I haven't been successful
> searching for information about it, beyond the man pages and what the
> perf wiki says.
>
> Thanks,
> Ryan
>
> --
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next prev parent reply other threads:[~2012-10-17 13:50 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-17 12:26 perf top -z not working? Ryan Johnson
2012-10-17 13:49 ` Chulmin Kim [this message]
2012-10-22 1:46 ` Arnaldo Carvalho de Melo
2012-10-22 11:50 ` Ryan Johnson
2012-10-22 13:12 ` David Ahern
2012-10-22 14:10 ` Ryan Johnson
2012-10-22 14:13 ` Chulmin Kim
2012-10-22 14:15 ` Chulmin Kim
2012-10-22 14:45 ` Arnaldo Carvalho de Melo
2012-10-22 15:01 ` David Ahern
2012-10-22 16:04 ` Ryan Johnson
2012-10-23 6:04 ` Namhyung Kim
2012-10-23 16:10 ` David Ahern
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