linux-kernel - Re: [PATCH 0/4] delayacct: save max CPU/IO/SWAP/RECLAIM delays

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Date:	Tue, 29 Nov 2011 10:23:32 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Satoru Moriya <satoru.moriya@....com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"bsingharora@...il.com" <bsingharora@...il.com>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"nagar@...son.ibm.com" <nagar@...son.ibm.com>,
	"kobayashi.kk@...s.nec.co.jp" <kobayashi.kk@...s.nec.co.jp>,
	Randy Dunlap <rdunlap@...otime.net>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"dle-develop@...ts.sourceforge.net" 
	<dle-develop@...ts.sourceforge.net>,
	Seiji Aguchi <seiji.aguchi@....com>
Subject: Re: [PATCH 0/4] delayacct: save max CPU/IO/SWAP/RECLAIM delays

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.
> 
> Example output:
> (on 100 concurrent dd reading sparse files w/ 1 dd writing a file)
> 
> CPU             count     real total  virtual total    delay total      delay_max  delay average
>                   222       45993008       74603882        7637295        3691858          0.034ms
> IO              count    delay total      delay max  delay average
>                     2       21812073       12728672             10ms
> SWAP            count    delay total      delay max  delay average
>                     0              0              0              0ms
> RECLAIM         count    delay total      delay_max  delay average
>                     2         348488         211985              0ms
> 
> Any comments are welcome.

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.
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