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Message-ID: <1327921293.2446.202.camel@twins>
Subject: Re: perf: prctl(PR_TASK_PERF_EVENTS_DISABLE) has no effect
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Ingo Molnar <mingo@elte.hu>
Cc: =?ISO-8859-1?Q?Fr=E9d=E9ric?= Weisbecker <fweisbec@gmail.com>,
        Andrew Steets <asteets@rgmadvisors.com>,
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        Paul Mackerras <paulus@samba.org>,
        Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Date: Mon, 30 Jan 2012 12:01:33 +0100
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On Mon, 2012-01-30 at 11:11 +0100, Ingo Molnar wrote:
> So, what workflow are you suggesting to Andrew?

Librarize perf record, then in your code do something like:

#include "perf_record.h"

  handle = perf_record_init(); /* creates perf events and creates
                                  a record thread that writes samples
                                  to perf.data, consumes env(PERF_*)
                                  for configuration, registers with
                                  at_exit() for cleanup */
  if (!handle)
    /* burn */

  /* do you other code */

  perf_record_start(handle);

  /* do the bit you want profiled */

  perf_record_stop(handle);

Then build with -lperfrecord or so. Not too hard, right?