linux-kernel - Re: [PATCH 2/2 -tip] perf_counter: Add generalized hardware interrupt support for AMD and Intel Corei7/Nehalem, Core2 and Atom

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Date:	Fri, 3 Jul 2009 12:33:04 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jaswinder Singh Rajput <jaswinder@...nel.org>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	Paul Mackerras <paulus@...ba.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.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 2/2 -tip] perf_counter: Add generalized hardware
	interrupt support for AMD and Intel Corei7/Nehalem, Core2 and Atom


* 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

What's your take on my review feedback:

> We could and should probably add a software counter for hardirqs 
> as well. 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.
>
> This way we could profile based on a specific interrupt source 
> only - say based on the networking card.

Why did you resend the patch while there was still unanswered review 
feedback?

	Ingo
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