linux-kernel - Re: [PATCH v5 13/13] perf record: introduce --ctl-fd[-ack] options

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Date:   Mon, 1 Jun 2020 16:37:32 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 13/13] perf record: introduce --ctl-fd[-ack] options

> > or a pathname, or including also the event default of "disabled".
> 
> For my cases conversion of pathnames into open fds belongs to external
> controlling process e.g. like in the examples provided in the patch set.
> Not sure about "event default of 'disabled'"

It would be nicer for manual use cases if perf supported the path names
directly like in Adrian's example, not needing a complex wrapper script.

-Andi
> 
> > 
> > e.g. add "--control" and support all of:
> > 
> > --control
> > --control 11
> > --control 11,15
> > --control 11,15,disabled
> > --control 11,,disabled
> > --control /tmp/my-perf.fifo
> > --control /tmp/my-perf.fifo,/tmp/my-perf-ack.fifo
> > --control /tmp/my-perf.fifo,/tmp/my-perf-ack.fifo,disabled
> > --control /tmp/my-perf.fifo,,disabled
> > 
> > Regards
> > Adrian
> > 
> 
> Regards,
> Alexey
>