linux-kernel - Re: [PATCH v3 10/11] perf/x86/intel: Perform rotation on Intel CQM RMIDs

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Message-ID: <20141110205031.GE1292@console-pimps.org>
Date:	Mon, 10 Nov 2014 20:50:31 +0000
From:	Matt Fleming <matt@...sole-pimps.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...nel.org>, Jiri Olsa <jolsa@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Andi Kleen <andi@...stfloor.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>,
	Kanaka Juvva <kanaka.d.juvva@...el.com>,
	Matt Fleming <matt.fleming@...el.com>
Subject: Re: [PATCH v3 10/11] perf/x86/intel: Perform rotation on Intel CQM
 RMIDs

On Fri, 07 Nov, at 01:18:03PM, Peter Zijlstra wrote:
> On Thu, Nov 06, 2014 at 12:23:21PM +0000, Matt Fleming wrote:
> > +	/*
> > +	 * Test whether an RMID is free for each package.
> > +	 */
> > +	preempt_disable();
> > +	smp_call_function_many(&cqm_cpumask, intel_cqm_stable, NULL, true);
> > +	preempt_enable();
> 
> Same problem again, the current cpu is not included.
> 
> Ah, just found we have on_each_cpu_mask(), which is what you want.

Aha, yes, that looks useful. Thanks!

-- 
Matt Fleming, Intel Open Source Technology Center
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