linux-kernel - Re: Incorrect accounting of irq into the running task

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Message-ID: <20130105172116.GA65150@digium.com>
Date:	Sat, 5 Jan 2013 11:21:16 -0600
From:	Shaun Ruffell <sruffell@...ium.com>
To:	Sadasivan Shaiju <sshaiju@...sta.com>
Cc:	linux-kernel@...r.kernel.org, venki@...gle.com,
	a.p.zijlstra@...llo.nl
Subject: Re: Incorrect accounting of irq into the running task

On Fri, Jan 04, 2013 at 10:22:12AM -0800, Sadasivan Shaiju wrote:
> Hi  Venkatesh,
> 
> I have applied the following patches for the incorrect accounting
> of irq into the running task .
> 
> 
> [PATCH] x86: Add IRQ_TIME_ACCOUNTING
> [e82b8e4ea4f3dffe6e7939f90e78da675fcc450e]
> [PATCH] sched: Add IRQ_TIME_ACCOUNTING, finer accounting of irq time
> [b52bfee445d315549d41eacf2fa7c156e7d153d5]
> 
> [PATCH] sched: Do not account irq time to current task
> [305e6835e05513406fa12820e40e4a8ecb63743c]
> [PATCH] sched: Export ns irqtimes through /proc/stat
> [abb74cefa9c682fb38ba86c17ca3c86fed6cc464]
> 
> 
> 
> But still the stime and utime of the process in /proc/pid/stat is
> high. I think the above patches does not update The stime and
> utime values in /proc/pid/stat.
> 
> 
> Or am I missing anything?

Just checking that you do have CONFIG_IRQ_TIME_ACCOUNTING=y in your
kernel config?

Cheers,
Shaun
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