linux-kernel - Re: [PATCH v4 2/2] perf stat: Add support to print counts after a period of time

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Message-ID: <20180216131815.GB24436@kernel.org>
Date:   Fri, 16 Feb 2018 10:18:15 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     ufo19890607 <ufo19890607@...il.com>
Cc:     peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, jolsa@...nel.org,
        dsahern@...il.com, namhyung@...nel.org, milian.wolff@...b.com,
        arnaldo.melo@...il.com, yuzhoujian@...ichuxing.com,
        adrian.hunter@...el.com, wangnan0@...wei.com, Kan.liang@...el.com,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        acme@...hat.com
Subject: Re: [PATCH v4 2/2] perf stat: Add support to print counts after a
 period of time

Em Thu, Feb 15, 2018 at 10:39:21AM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Mon, Jan 29, 2018 at 10:25:23AM +0100, ufo19890607 escreveu:
> > From: yuzhoujian <yuzhoujian@...ichuxing.com>
> > 
> > Introduce a new option to print counts after N milliseconds
> 
> This doesn't just print counts after N ms, it _stops_ the workload after
> that time _and_ prints the counts, right?
> 
> Can you please send a followup patch fixing the description and
> documentation?
> 
> I've applied this already, but clarifying what this option does is in
> demand.

So, this fails to build on centos:5 and centos:6 and similar systems
where the use of 'time' for a variable name breaks the build:

  CC       /tmp/build/perf/builtin-stat.o
cc1: warnings being treated as errors
builtin-stat.c: In function '__run_perf_stat':
builtin-stat.c:576: warning: declaration of 'time' shadows a global declaration
/usr/include/time.h:187: warning: shadowed declaration is here
builtin-stat.c: In function 'cmd_stat':
builtin-stat.c:2710: warning: declaration of 'time' shadows a global declaration
/usr/include/time.h:187: warning: shadowed declaration is here
mv: cannot stat `/tmp/build/perf/.builtin-stat.o.tmp': No such file or directory
make[3]: *** [/tmp/build/perf/builtin-stat.o] Error 1
make[3]: *** Waiting for unfinished jobs....
  MKDIR    /tmp/build/perf/util/
  CC       /tmp/build/perf/util/evsel_fprintf.o
make[2]: *** [/tmp/build/perf/perf-in.o] Error 2
make[2]: *** Waiting for unfinished jobs....

So since I had to rename that I replaced it with 'timeout', so that it
gets clear that when you specify this option you are setting a timeout
period that if hit will stop the 'perf stat' session and then print the
specified counters.

Please let us know if you have any strong objection to this,

- Arnaldo