linux-kernel - Re: [patch 0/3] [Announcement] Performance Counters for Linux

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Message-ID: <20081210110314.GA25779@one.firstfloor.org>
Date:	Wed, 10 Dec 2008 12:03:14 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Paul Mundt <lethal@...ux-sh.org>, Andi Kleen <andi@...stfloor.org>,
	David Miller <davem@...emloft.net>, mingo@...e.hu,
	a.p.zijlstra@...llo.nl, paulus@...ba.org, tglx@...utronix.de,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	akpm@...ux-foundation.org, eranian@...glemail.com,
	dada1@...mosbay.com, robert.richter@....com, arjan@...radead.org,
	hpa@...or.com, rostedt@...dmis.org
Subject: Re: [patch 0/3] [Announcement] Performance Counters for Linux

On Wed, Dec 10, 2008 at 07:23:36PM +0900, Paul Mundt wrote:
> On Wed, Dec 10, 2008 at 11:28:19AM +0100, Andi Kleen wrote:
> > > Oprofile has been a pretty bad fit for them, and while I'm slightly more
> > 
> > You could always use a extension of timer mode that reads them
> > periodically? 
> > 
> This is what I do today, but it is not an ideal solution. It would be
> nice if these sorts of use cases could be supported by newer frameworks
> without every platform with similar requirements having to implement
> workarounds hanging off of the timer IRQ.

But you shouldn't hang off the timer irq anyways, but better use a regular
timer or hr timer. This would give more regular sampling even with dyntick.
And doing such a timer is only a few lines of code, I'm not sure it would
buy you all that much to generalize it.

-Andi

-- 
ak@...ux.intel.com
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