linux-kernel - Re: [PATCH v3 2/2] perf,x86: skip intel_cqm_stable if CMT is not present in a CPU model

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Message-ID: <20150817131658.GC3233@codeblueprint.co.uk>
Date:	Mon, 17 Aug 2015 14:16:58 +0100
From:	Matt Fleming <matt@...eblueprint.co.uk>
To:	Kanaka Juvva <kanaka.d.juvva@...ux.intel.com>
Cc:	kanaka.d.juvva@...el.com, glenn.p.williamson@...el.com,
	matt.fleming@...el.com, will.auld@...el.com, andi@...stfloor.org,
	linux-kernel@...r.kernel.org, tony.luck@...el.com,
	peterz@...radead.org, tglx@...utronix.de, tj@...nel.org,
	x86@...nel.org, mingo@...hat.com, hpa@...or.com,
	vikas.shivappa@...el.com
Subject: Re: [PATCH v3 2/2] perf,x86: skip intel_cqm_stable if CMT is not
 present in a CPU model

On Sat, 08 Aug, at 12:36:19AM, Kanaka Juvva wrote:
> CMT and MBM are complementary technologies. One technology doesn't
> imply the other technology. If CMT is not present in your CPU model
> intel_cqm_stable() won't be called when computing a free RMID. This
> is because, LLC_OCCUPANCY reading in this case doesn't apply and
> shouldn't be used a criteria for freeing or picking an RMID.
> 
> Signed-off-by: Kanaka Juvva <kanaka.d.juvva@...ux.intel.com>
> ---
>  arch/x86/kernel/cpu/perf_event_intel_cqm.c | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)

Shouldn't this patch be the first one in the series?

-- 
Matt Fleming, Intel Open Source Technology Center
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