linux-kernel - Re: [PATCH] Migration of Standard Timers

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Date:	Tue, 19 Sep 2006 11:41:59 -0500
From:	Dimitri Sivanich <sivanich@....com>
To:	Lee Revell <rlrevell@...-job.com>
Cc:	linux-kernel@...r.kernel.org, akpm@...l.org,
	Thomas Gleixner <tglx@...utronix.de>, Andi Kleen <ak@...e.de>,
	Jes Sorensen <jes@....com>
Subject: Re: [PATCH] Migration of Standard Timers

On Tue, Sep 19, 2006 at 12:33:37PM -0400, Lee Revell wrote:
> Which driver or subsystem is doing 100s of usecs of work in a timer?

The longest one I've captured so far results from:

rsp                rip                Function (args)
 ======================= <nmi>
0xffff810257822fd8 0xffffffff803a0e94 rt_check_expire+0x8c
 ======================= <interrupt>  
0xffff81025781fee8 0xffffffff803a0e08 rt_check_expire
0xffff81025781ff08 0xffffffff802386b3 run_timer_softirq+0x133
0xffff81025781ff38 0xffffffff80235262 __do_softirq+0x5e
0xffff81025781ff68 0xffffffff8020a958 call_softirq+0x1c
0xffff81025781ff80 0xffffffff8020bea7 do_softirq+0x2c
0xffff81025781ff90 0xffffffff80235142 irq_exit+0x48

> Shouldn't another mechanism like a workqueue be used instead?

Not quite sure what you're asking here.
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