linux-kernel - Re: [PATCH v4 00/11] perf: Intel Cache QoS Monitoring support

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Message-ID: <20141218075946.GA11685@console-pimps.org>
Date:	Thu, 18 Dec 2014 07:59:46 +0000
From:	Matt Fleming <matt@...sole-pimps.org>
To:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>, Jiri Olsa <jolsa@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Andi Kleen <andi@...stfloor.org>
Cc:	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>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v4 00/11] perf: Intel Cache QoS Monitoring support

On Tue, 25 Nov, at 02:55:09PM, Matt Fleming wrote:
> On Fri, 14 Nov, at 09:15:01PM, Matt Fleming wrote:
> > From: Matt Fleming <matt.fleming@...el.com>
> > 
> > This patch series adds a new PMU driver for the Intel Cache Monitoring
> > hardware feature available in Intel Xeon processors, which allows
> > monitoring of LLC occupancy on a task, group or system-wide basis.
> > 
> > The first few patches modify tools/perf to handle per-package counters,
> > which necessitates discarding some values when doing per-cpu reads to
> > avoid getting duplicate data. The rest add support for the new PMU code.
> > 
> > I've left a notoriously funky bit of code near the end of the series,
> > the RMID rotation code, in an attempt to simplify things. Doing the
> > rotation provides the ability to multiplex the RMIDs and basically
> > overcome the hardware limitation, but the rest of the patches work fine
> > without it. But there are a number of scenarios where being able to
> > monitor more tasks than RMIDs is extremely useful.
> > 
> > The series is based on tip/perf/core.
> 
> Any feedback on this series?
> 
> Stephane, the original thread is here, 
> 
>   https://lkml.kernel.org/r/1415999712-5850-1-git-send-email-matt@console-pimps.org

Ping.

-- 
Matt Fleming, Intel Open Source Technology Center
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