Re: [PATCH] sched: Provide iowait counters

[Arjan van de Ven <arjan@linux.intel.com>]

Peter Zijlstra wrote:
> 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.

we can compose part of it from the details (but there's a lot of details),
but not nearly all of it, things like the IO bandwidth etc we just can't
do this with.

we could do this for cpu use to a large degree though I suppose