linux-kernel - Re: [PATCH 2/2] perf: Userspace software event and ioctl

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Date:	Fri, 26 Sep 2014 12:26:37 +0100
From:	Pawel Moll <pawel.moll@....com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Richard Cochran <richardcochran@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Paul Mackerras <paulus@...ba.org>,
	John Stultz <john.stultz@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-api@...r.kernel.org" <linux-api@...r.kernel.org>
Subject: Re: [PATCH 2/2] perf: Userspace software event and ioctl

On Fri, 2014-09-26 at 12:23 +0100, Ingo Molnar wrote:
> > As in: allows *all* tasks to inject the data? Are you sure we 
> > don't want more fine-grained control, in particular per task?
> 
> Yeah. If the profiler allows it, then any task that is being 
> traced can inject data.

The "that is being traced" fragment was the key here. I missed the fact
that perf trace already takes a list of pids, so we're not talking about
all tasks in the system. That should work.

Paweł

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