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Message-ID: <20190305123423.GA4533@krava>
Date: Tue, 5 Mar 2019 13:34:23 +0100
From: Jiri Olsa <jolsa@...hat.com>
To: Jin Yao <yao.jin@...ux.intel.com>
Cc: acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
mingo@...hat.com, alexander.shishkin@...ux.intel.com,
Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH v4 0/3] perf diff: Add new filter options
On Tue, Mar 05, 2019 at 09:05:40PM +0800, Jin Yao wrote:
> This patch series creates following new filter options for perf diff.
>
> --time:
> It supports time percent with multipe time ranges. Time string is
> 'a%/n,b%/m,...' or 'a%-b%,c%-%d,...'.
>
> For example:
>
> Select the second 10% time slice to diff:
> perf diff --time 10%/2
>
> Select from 0% to 10% time slice to diff:
> perf diff --time 0%-10%
>
> Select the first and the second 10% time slices to diff:
> perf diff --time 10%/1,10%/2
>
> Select from 0% to 10% and 30% to 40% slices to diff:
> perf diff --time 0%-10%,30%-40%
>
> It also supports to analyze samples within given time window as:
> <start>,<stop>. Times have the format seconds.microseconds. If start
> is not given (i.e., time string is ',x.y') then analysis starts at
> the beginning of the file. If stop time is not given (i.e, time
> string is 'x.y,') then analysis goes to end of file. Time string is
> 'a1.b1,c1.d1:a2.b2,c2.d2'. Use ':' to separate timestamps for different
> perf.data files.
>
> For example, we get the timestamp information from perf script.
>
> perf script -i perf.data.old
> mgen 13940 [000] 3946.361400: ...
>
> perf script -i perf.data
> mgen 13940 [000] 3971.150589 ...
>
> perf diff --time 3946.361400,:3971.150589,
>
> It analyzes the perf.data.old from the timestamp 3946.361400 to
> the end of perf.data.old and analyzes the perf.data from the
> timestamp 3971.150589 to the end of perf.data.
>
> --cpu:
> Only diff samples for the list of CPUs provided. Multiple CPUs can
> be provided as a comma-separated list with no space: 0,1. Ranges of
> CPUs are specified with -: 0-2. Default is to report samples on all
> CPUs.
>
> For example:
> perf diff --cpu 0,1
>
> It only diff the samples for CPU0 and CPU1.
>
> --pid:
> Only diff samples for given process ID (comma separated list).
>
> --tid:
> Only diff samples for given thread ID (comma separated list).
>
> For example,
> perf diff --tid 13965
>
> It only diff the samples for thread 13965.
>
> v4:
> ---
> Update abstime_str_dup(), let it return error if strdup
> is failed, and update __cmd_diff() accordingly.
>
> Only the patch "perf diff: Support --time filter option" is impacted
> Others are no logical changes.
>
> Jin Yao (3):
> perf diff: Support --time filter option
> perf diff: Support --cpu filter option
> perf diff: Support --pid/--tid filter options
Acked-by: Jiri Olsa <jolsa@...nel.org>
thanks,
jirka
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