linux-kernel - Re: perfmon2 merge news

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Message-ID: <20071117010716.GA13708@suse.de>
Date:	Fri, 16 Nov 2007 17:07:16 -0800
From:	Greg KH <gregkh@...e.de>
To:	David Miller <davem@...emloft.net>
Cc:	dean@...tic.org, andi@...stfloor.org, mucci@...utk.edu,
	akpm@...ux-foundation.org, eranian@....hp.com, wcohen@...hat.com,
	robert.richter@....com, linux-kernel@...r.kernel.org,
	ptools-perfapi@...utk.edu
Subject: Re: perfmon2 merge news

On Fri, Nov 16, 2007 at 04:29:05PM -0800, David Miller wrote:
> From: dean gaudet <dean@...tic.org>
> Date: Fri, 16 Nov 2007 09:51:08 -0800 (PST)
> 
> > On Fri, 16 Nov 2007, Andi Kleen wrote:
> > 
> > > I didn't see a clear list. 
> > 
> > - cross platform extensible API for configuring perf counters
> > - support for multiplexed counters
> > - support for virtualized 64-bit counters
> > - support for PC and call graph sampling at specific intervals
> > - support for reading counters not necessarily with sampling
> > - taskswitch support for counters
> > - API available from userland
> > - ability to self-monitor: need select/poll/etc interface
> > - support for PEBS, IBS and whatever other new perf monitoring 
> >   infrastructure the vendors through at us in the future
> > - low overhead:  must minimize the "probe effect" of monitoring
> > - low noise in measurements:  cannot achieve this in userland
> > 
> > permon2 has all of this and more i've probably neglected...
> 
> I want to state that even though I've been a stickler on the system
> call stuff, in general I want to see perfmon2 go into tree and I agree
> with how most of the infrastructure is implemented and the features it
> provides.

Now if we only had a series of patches that we could actually review and
apply to the -mm tree so that people can try them out... :)

thanks,

greg k-h
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