linux-kernel - Re: [PATCH 4/6 -tip] perf_counter: Add Generalized Hardware interrupt support for AMD

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Date:	Fri, 03 Jul 2009 17:31:55 +0530
From:	Jaswinder Singh Rajput <jaswinder@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arjan van de Ven <arjan@...radead.org>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Anton Blanchard <anton@...ba.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH 4/6 -tip] perf_counter: Add Generalized Hardware
 interrupt support for AMD

On Wed, 2009-07-01 at 13:24 +0200, Ingo Molnar wrote:
> * Jaswinder Singh Rajput <jaswinder@...nel.org> wrote:
> 
> > 
> > $ ./perf stat -e interrupts -e masked -e int-pending-mask-cycles -- ls -lR /usr/include/ > /dev/null
> > 
> >  Performance counter stats for 'ls -lR /usr/include/':
> > 
> >             377  interrupts
> >        53429936  int-mask-cycles
> >            1119  int-pending-mask-cycles
> > 
> >     0.371457539  seconds time elapsed
> 
> Agreed, this is another useful generalization - and the 'cycles 
> pending' metrics are not retrievable via any software means.
> 
> We could and should probably add a software counter for hardirqs as 
> wel. That would allow the vector/irqnr information to be passed in, 
> and it would allow architectures without irq metrics in the PMU to 
> have this counter too.
> 

Please let me know that addition of software counter will be in this
patch or we can do it incrementally after this patch.

Thanks,
--
JSR

http://userweb.kernel.org/~jaswinder/


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