Re: [PATCH v4 0/3] perf diff: Add new filter options
From: Jiri Olsa
Date: Tue Mar 05 2019 - 07:34:29 EST
On Tue, Mar 05, 2019 at 09:05:40PM +0800, Jin Yao wrote:
> This patch series creates following new filter options for perf diff.
> 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  3946.361400: ...
> perf script -i perf.data
> mgen 13940  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.
> 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
> For example:
> perf diff --cpu 0,1
> It only diff the samples for CPU0 and CPU1.
> Only diff samples for given process ID (comma separated list).
> Only diff samples for given thread ID (comma separated list).
> For example,
> perf diff --tid 13965
> It only diff the samples for thread 13965.
> 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@xxxxxxxxxx>