linux-kernel - Re: [patch 1/6] x86, perf, cqm: Document PQR MSR abuse

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Message-ID: <20150519115352.GE17401@codeblueprint.co.uk>
Date:	Tue, 19 May 2015 12:53:52 +0100
From:	Matt Fleming <matt@...eblueprint.co.uk>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Vikas Shivappa <vikas.shivappa@...ux.intel.com>,
	x86@...nel.org, Matt Fleming <matt.fleming@...el.com>,
	Will Auld <will.auld@...el.com>,
	Kanaka Juvva <kanaka.d.juvva@...el.com>
Subject: Re: [patch 1/6] x86, perf, cqm: Document PQR MSR abuse

On Tue, 19 May, at 12:00:50AM, Thomas Gleixner wrote:
> The cqm code acts like it owns the PQR MSR completely. That's not true
> because only the lower 10 bits are used for CQM. The upper 32bits are
> used for CLass Of Service ID (closid). Document the abuse. Will be
> fixed in a later patch.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> ---
>  arch/x86/kernel/cpu/perf_event_intel_cqm.c |   15 +++++++++++++--
>  1 file changed, 13 insertions(+), 2 deletions(-)

Acked-by: Matt Fleming <matt.fleming@...el.com>

-- 
Matt Fleming, Intel Open Source Technology Center
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