linux-kernel - Re: [PATCH v7 5/6] perf report: support time percent and multiple time ranges

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Date:   Mon, 8 Jan 2018 12:02:35 -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 5/6] perf report: support time percent and multiple
 time ranges

Em Mon, Jan 08, 2018 at 11:53:36AM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Fri, Dec 08, 2017 at 09:13:45PM +0800, Jin Yao escreveu:
> > perf report has a --time option to limit the time range of output.
> > It only supports absolute time.
> > 
> > Now this option is extended to support multiple time ranges and
> > support the percent of time.
> > 
> > For example:
> > 
> > 1. Select the first and second 10% time slices
> > perf report --time 10%/1,10%/2
> > 
> > 2. Select from 0% to 10% and 30% to 40% slices
> > perf report --time 0%-10%,30%-40%

So now it works, but we need to improve the error messages, i.e. if one
does:

   perf report --time 10%

should this be equivalent to:

   perf report --time 10%/1

?

Or at least say something like:

   "percent slices need an index to specify which one is wanted"

when you notice a % in the --time string, etc.

Consider these for follow up patches.

- Arnaldo