linux-kernel - Re: perfmon2 merge news

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Date:	Fri, 16 Nov 2007 16:29:05 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	dean@...tic.org
Cc:	andi@...stfloor.org, mucci@...utk.edu, akpm@...ux-foundation.org,
	gregkh@...e.de, eranian@....hp.com, wcohen@...hat.com,
	robert.richter@....com, linux-kernel@...r.kernel.org,
	ptools-perfapi@...utk.edu
Subject: Re: perfmon2 merge news

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.
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