linux-kernel - Re: [PATCH 5/5] Account ksoftirqd time as cpustat softirq -v2

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Date:	Wed, 22 Dec 2010 15:05:24 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Venkatesh Pallipadi <venki@...gle.com>
Cc:	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux-kernel@...r.kernel.org, Paul Turner <pjt@...gle.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Shaun Ruffell <sruffell@...ium.com>
Subject: Re: [PATCH 5/5] Account ksoftirqd time as cpustat softirq -v2

On Wed, 2010-12-22 at 05:59 -0800, Venkatesh Pallipadi wrote:
> > So you add the ksoftirqd runtime as softirq time in the /proc/stat
> > output?
> >
> > That seems dubious...
> >
> 
> Yes. Thats similar to what we do today. As long as we are in softirq,
> whether bottomhalf or ksoftirqd, we account the tick as softirq time
> in /proc/stat.
> I thought it also makes sense from user perspective. They want to know
> how much time are we currently spending serving softirqs and hardirqs.
> It is better to get that information at one place, instead of say look
> at /proc/stat and add percpu ksoftirqd time to it. I mean,
> user/administrator does not have to care whether ksoftirqd is involved
> or not to know how much time was spend serving softirqs.
> 
But ksoftirqd time is also counted as sys time, so somewhere this won't
add up to 100%.
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