linux-kernel - Re: [PATCH v7 3/6] perf util: Create function to parse time percent

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Date:   Mon, 8 Jan 2018 11:38:59 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jin Yao <yao.jin@...ux.intel.com>
Cc:     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 v7 3/6] perf util: Create function to parse time percent

Em Mon, Jan 08, 2018 at 11:31:49AM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Fri, Dec 08, 2017 at 09:13:43PM +0800, Jin Yao escreveu:
> > Current perf report/script/... have a --time option to limit the time
> > range of output. But right now it only supports absolute time.
> > 
> > For easy using, now it can support a percent of time usage.
> > 
> > For example:
> > 
> > 1. Select the second 10% time slice
> >    perf report --time 10%/2
> 
> After applying this patch I'm not being able to get any of these
> examples to work:
> 
> [root@...et home]# perf report --header | grep "time of"
> # time of first sample : 22947.909226
> # time of last sample : 22948.910704
> [root@...et home]# 
> 
> Then, when I try the first example:
> 
> [root@...et home]# perf report --stdio --time 1%-20%
> Invalid time string
> # To display the perf.data header info, please use --header/--header-only options.
> #
> [root@...et home]#
> 
> What am I doing wrong?

Oh well, the way you worded this cset it looked like after applying it I
would be able to use percents, etc, which is not the case, I'll probably
need to apply the next patches to _then_ this work as advertised in this
cset comment.

Please try to make it clear in the commit messages these details, to
ease reviewing.

- Arnaldo