linux-kernel - Re: [PATCH 0/4] Finer granularity and task/cgroup irq time accounting

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Date:	Tue, 24 Aug 2010 15:08:14 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	balbir@...ux.vnet.ibm.com
Cc:	Venkatesh Pallipadi <venki@...gle.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Paul Menage <menage@...gle.com>, linux-kernel@...r.kernel.org,
	Paul Turner <pjt@...gle.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Paul Mackerras <paulus@...ba.org>,
	Tony Luck <tony.luck@...el.com>
Subject: Re: [PATCH 0/4] Finer granularity and task/cgroup irq time
 accounting

On Tue, 2010-08-24 at 18:17 +0530, Balbir Singh wrote:
> 
> "There are usecases where reporting this time against task
> or task groups or cgroups will be useful for user/administrator
> in terms of resource planning and utilization charging"

Or confusing, what happens if you attribute the IRQ overhead of a
ping-flood to your tasks?

By not providing these numbers per task/group people will have to
actually think about what it is that is causing these high irq loads and
have a chance of actually doing better than random attribution.

So no, providing random numbers on the slight chance that they might
possibly make sense for your workload doesn't seem like a sound reason
to provide them.


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