linux-kernel - Re: [PATCH v2 5/6] perf stat: Enable iiostat mode for x86 platforms

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Date:   Fri, 15 Jan 2021 16:33:41 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Alexander Antonov <alexander.antonov@...ux.intel.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Jiri Olsa <jolsa@...hat.com>, Andi Kleen <ak@...ux.intel.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Mark Rutland <mark.rutland@....com>,
        Ian Rogers <irogers@...gle.com>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v2 5/6] perf stat: Enable iiostat mode for x86 platforms

On Fri, Jan 15, 2021 at 1:41 AM Alexander Antonov
<alexander.antonov@...ux.intel.com> wrote:
> On 1/14/2021 6:39 AM, Namhyung Kim wrote:
> > On Wed, Jan 13, 2021 at 9:08 PM Alexander Antonov
> > <alexander.antonov@...ux.intel.com> wrote:
> >>
> >> On 1/6/2021 12:02 PM, Namhyung Kim wrote:
> >>> On Wed, Dec 23, 2020 at 10:03 PM Alexander Antonov
> >>>> diff --git a/tools/perf/perf-iiostat.sh b/tools/perf/perf-iiostat.sh
> >>>> new file mode 100644
> >>>> index 000000000000..2c5168d2550b
> >>>> --- /dev/null
> >>>> +++ b/tools/perf/perf-iiostat.sh
> >>>> @@ -0,0 +1,12 @@
> >>>> +#!/bin/bash
> >>>> +# SPDX-License-Identifier: GPL-2.0
> >>>> +# perf iiostat
> >>>> +# Alexander Antonov <alexander.antonov@...ux.intel.com>
> >>>> +
> >>>> +if [[ "$1" == "show" ]] || [[ "$1" =~ ([a-f0-9A-F]{1,}):([a-f0-9A-F]{1,2})(,)? ]]; then
> >>>> +        DELIMITER="="
> >>>> +else
> >>>> +        DELIMITER=" "
> >>>> +fi
> >>>> +
> >>>> +perf stat --iiostat$DELIMITER$*
> >>> Why is this needed?
> >>>
> >>> Thanks,
> >>> Namhyung
> >> Arnaldo raised question relates to format of 'perf stat --iiostat'
> >> subcommand
> >> and explained how it can be changed to 'perf iiostat' through the aliases
> >> mechanism in perf.
> > Yeah, I know that.  What I'm asking is the DELIMITER part.
> >
> > Thanks,
> > Namhyung
> I'm using DELIMITER to resolve two different cases for format of iiostat
> command:
> The first one is the command with an option for iiostat mode, for example:
> 'perf iiostat show' which should be converted to 'perf stat
> --iiostat=show' or
> 'perf iiostat 0000:ae,0000:5d' to 'perf stat --iiostat=0000:ae,0000:5d'.
> The second is the command without any option for iiostat: 'perf iiostat
> -I 1000'
> should be converted to 'perf stat --iiostat -I 1000'.

Can't we simply use a whitespace ?

Thanks,
Namhyung