RE: [PATCH 0/4] delayacct: save max CPU/IO/SWAP/RECLAIM delays

[Satoru Moriya]

On 11/29/2011 04:23 AM, Peter Zijlstra wrote:
> On Mon, 2011-11-28 at 17:44 -0500, Satoru Moriya wrote:
>> In the latency sensitive systems, we usually focus on the worst latency.
>> And so, it is useful to save max delays into the per-task delay 
>> accounting functionality.
>>
> 
> No!!!
> 
> Linus told us to be bastards, so there you have it.
> 
> There's way too many different accounting crap thingies around. And 
> now I get a patch without any justification what so ever. So no, piss off.

I agree that there are other ways to get max latency.

I think that with delayacct we can easily get delay statistics
which each task or task-group encountered in their life time
because delayacct records "per-task" delay.

But I just may not know better tools/functions.

Do you think which tools/functions is the best one (to extend)?
ftrace? perf?

Regards,
Satoru
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