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From: taeung <treeze.taeung@gmail.com>
To: linux-perf-users@vger.kernel.org
Cc: Namhyung Kim <namhyung@kernel.org>
Subject: What do zeroing of samples in 'perf top' mean ?
Date: Tue, 30 Sep 2014 12:19:41 +0900	[thread overview]
Message-ID: <542A214D.1090804@gmail.com> (raw)

Hi,

I have two questions about 'zeroing of samples' in 'perf top'.

I knew if I use 'perf top', I can see a performance counter profile in 
real time.
But I can't find a difference between 'perf top -a' and 'perf top --zero'.

After 'perf top' is run , I press key 'z' to toggle zeroing of samples.
But I don't know a difference between when I press key 'z' and before I 
did it.

1. What is 'Zero history' ?
(I saw it in Documentation/perf-top.txt that '--zero' option is 'Zero 
history across display updates.')

2. What do 'zeroing of samples' mean ?

Thanks,
Taeung

             reply	other threads:[~2014-09-30  3:19 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-09-30  3:19 taeung [this message]
2014-09-30  5:55 ` What do zeroing of samples in 'perf top' mean ? Namhyung Kim
2014-10-01  1:45 ` taeung
2014-10-04 16:51   ` TaeWoong Song

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