linux-kernel - Re: [PATCH] perf script: introduce deltatime option

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Date:   Thu, 26 Mar 2020 11:33:55 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Hagen Paul Pfeifer <hagen@...u.net>
Cc:     linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Jiri Olsa <jolsa@...nel.org>
Subject: Re: [PATCH] perf script: introduce deltatime option

Em Tue, Feb 04, 2020 at 06:37:09PM +0100, Hagen Paul Pfeifer escreveu:
> For some kind of analysis a deltatime output is more human friendly and reduce
> the cognitive load for further analysis.
> 
> The following output demonstrate the new option "deltatime": calculate
> the time difference in relation to the previous event.
> 
> $ perf script --deltatime
> test  2525 [001]     0.000000:            sdt_libev:ev_add: (5635e72a5ebd)
> test  2525 [001]     0.000091:  sdt_libev:epoll_wait_enter: (5635e72a76a9)
> test  2525 [001]     1.000051: sdt_libev:epoll_wait_return: (5635e72a772e) arg1=1
> test  2525 [001]     0.000685:            sdt_libev:ev_add: (5635e72a5ebd)
> test  2525 [001]     0.000048:  sdt_libev:epoll_wait_enter: (5635e72a76a9)
> test  2525 [001]     1.000104: sdt_libev:epoll_wait_return: (5635e72a772e) arg1=1
> test  2525 [001]     0.003895:  sdt_libev:epoll_wait_enter: (5635e72a76a9)
> test  2525 [001]     0.996034: sdt_libev:epoll_wait_return: (5635e72a772e) arg1=1
> test  2525 [001]     0.000058:  sdt_libev:epoll_wait_enter: (5635e72a76a9)
> test  2525 [001]     1.000004: sdt_libev:epoll_wait_return: (5635e72a772e) arg1=1
> test  2525 [001]     0.000064:  sdt_libev:epoll_wait_enter: (5635e72a76a9)
> test  2525 [001]     0.999934: sdt_libev:epoll_wait_return: (5635e72a772e) arg1=1
> test  2525 [001]     0.000056:  sdt_libev:epoll_wait_enter: (5635e72a76a9)
> test  2525 [001]     0.999930: sdt_libev:epoll_wait_return: (5635e72a772e) arg1=1

You forgot to update the man page, I did it, tested and applied, thanks.

- Arnaldo

diff --git a/tools/perf/Documentation/perf-script.txt b/tools/perf/Documentation/perf-script.txt
index db6a36aac47e..4af255bb0977 100644
--- a/tools/perf/Documentation/perf-script.txt
+++ b/tools/perf/Documentation/perf-script.txt
@@ -390,6 +390,9 @@ include::itrace.txt[]
 --reltime::
 	Print time stamps relative to trace start.
 
+--deltatime::
+	Print time stamps relative to previous event.
+
 --per-event-dump::
 	Create per event files with a "perf.data.EVENT.dump" name instead of
         printing to stdout, useful, for instance, for generating flamegraphs.