linux-kernel - Re: [perfmon] Re: [perfmon2] perfmon2 merge news

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Message-ID: <alpine.DEB.0.9999.0711142113210.10158@twinlark.arctic.org>
Date:	Wed, 14 Nov 2007 21:14:34 -0800 (PST)
From:	dean gaudet <dean@...tic.org>
To:	Paul Mackerras <paulus@...ba.org>
cc:	Andi Kleen <andi@...stfloor.org>,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg KH <gregkh@...e.de>, Philip Mucci <mucci@...utk.edu>,
	eranian@....hp.com, William Cohen <wcohen@...hat.com>,
	Robert Richter <robert.richter@....com>,
	linux-kernel@...r.kernel.org
Subject: Re: [perfmon] Re: [perfmon2] perfmon2 merge news

On Thu, 15 Nov 2007, Paul Mackerras wrote:

> dean gaudet writes:
> 
> > actually multiplexing is the main feature i am in need of. there are an 
> > insufficient number of counters (even on k8 with 4 counters) to do 
> > complete stall accounting or to get a general overview of L1d/L1i/L2 cache 
> > hit rates, average miss latency, time spent in various stalls, and the 
> > memory system utilization (or HT bus utilization).  this runs out to 
> > something like 30 events which are interesting... and re-running a 
> > benchmark over and over just to get around the lack of multiplexing is a 
> > royal pain in the ass.
> 
> So by "multiplexing" do you mean the ability to have multiple event
> sets associated with a context and have the kernel switch between them
> automatically?

yep.

-dean
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