linux-kernel - Re: [PATCH 0/3] perf/core, x86: unify perfctr bitmasks

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Date:	Tue, 30 Mar 2010 19:11:33 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Stephane Eranian <eranian@...gle.com>,
	Robert Richter <robert.richter@....com>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/3] perf/core, x86: unify perfctr bitmasks

On Tue, Mar 30, 2010 at 05:00:55PM +0200, Peter Zijlstra wrote:
> On Tue, 2010-03-30 at 15:53 +0200, Stephane Eranian wrote:
> > > So, there are some ARCH_PERFMON_EVENTSEL_* masks that are Intel only,
> > > which is true for ARCH_PERFMON_EVENTSEL_ANY. And indead, the code
> > > should be checked for this. ARCH_PERFMON_EVENTSEL_ANY is always
> > > cleared on AMD cpus, so this code is ok. Actually the bit is cleared
> > 
> > Until AMD uses that bit too and you won't notice this test. This is a security
> > check specific to Intel and it should be in an Intel-specific function.
> > 
> > > for *all* cpus in x86_pmu_raw_event(), the code was and is broken for
> > > this.
> > >
> > Yes, needs to be authorized for any perfmon v3 and later revisions.
> 
> So how about something like this on top of Robert's patches?
> 
[...]

Looks good for me! Thanks Peter!

	-- Cyrill
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