Subject: Re: [RFC][PATCH] irq_work
From: Peter Zijlstra <peterz@infradead.org>
To: Huang Ying <ying.huang@intel.com>
Cc: Ingo Molnar <mingo@elte.hu>, "H.PeterA" <"nvin hpa"@zytor.com>,
       linux-kernel@vger.kernel.org, Andi Kleen <andi@firstfloor.org>
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Date: Thu, 24 Jun 2010 09:19:53 +0200
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On Thu, 2010-06-24 at 15:04 +0800, Huang Ying wrote:

> Yes. NMI is there from 8259 age.

But do we really care about such systems?

> That is possible. But in NO_HZ system, we have no tick to rely on.

Of course you have, you can delay the NO_HZ state when there's pending
callbacks, that's all of 1 line.

> soft_irq is better here, because it will be triggered for any interrupt.

Well, you can do the callbacks from irq_exit() as well, that's no
problem.
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