linux-kernel - Re: [PATCH 2/7] perf, x86: Implement IBS initialization

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Date:	Mon, 1 Aug 2011 07:27:12 +0200
From:	Robert Richter <robert.richter@....com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/7] perf, x86: Implement IBS initialization

On 29.07.11 12:58:45, Peter Zijlstra wrote:
> On Thu, 2011-07-28 at 15:46 +0200, Robert Richter wrote:
> > +static int perf_ibs_add(struct perf_event *event, int flags)
> > +{
> > +       pr_info("Adding event %p (config=%016llx) to pmu %s (type=%d) on cpu %d\n",
> > +               event, event->attr.config, perf_ibs.name, event->attr.type, event->oncpu);
> > +       return 0;
> > +}
> > +
> > +static void perf_ibs_del(struct perf_event *event, int flags)
> > +{
> > +       pr_info("Removing event %p (config=%016llx) to pmu %s (type=%d) on cpu %d\n",
> > +               event, event->attr.config, perf_ibs.name, event->attr.type, event->oncpu);
> > +} 
> 
> While I see you remove them later on, I do find it somewhat strange to
> have them here. This is user triggerable code in the context switch
> path, lots of nasty can come from this.

I will remove it and simply replace it with function stubs.

-Robert

-- 
Advanced Micro Devices, Inc.
Operating System Research Center

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