linux-kernel - Re: [PATCH] sched: Provide iowait counters

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Message-Id: <1248543674.5780.36.camel@laptop>
Date:	Sat, 25 Jul 2009 19:41:14 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Arjan van de Ven <arjan@...ux.intel.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	"Kok, Auke-jan H" <auke-jan.h.kok@...el.com>
Subject: Re: [PATCH] sched: Provide iowait counters

On Sat, 2009-07-25 at 09:42 -0700, Arjan van de Ven wrote:
> 
> In case you wonder why you need both tools, and can't just use one: we
> wondered the same, but it turns out that if you only build
> Tool Two, you don't get a good overview of what is going on on a
> higher level. It's like looking at the world via a microscope all the
> time,

I'd be thinking you could compose your ms based picture on the sample
data. For instance, if you sample on cpu-clock at 100kHz, then a 100
samples get you a full blue slice, 50 get you a 50% blue slice, etc.

Of course, since its sample based, you can miss some detail, but I think
you're looking at the large picture anyway.

Would this work?

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