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Message-ID: <1277364727.1875.857.camel@laptop> Date: Thu, 24 Jun 2010 09:32:07 +0200 From: Peter Zijlstra <peterz@...radead.org> To: Huang Ying <ying.huang@...el.com> Cc: Ingo Molnar <mingo@...e.hu>, "H.PeterA" <"nvin hpa"@zytor.com>, linux-kernel@...r.kernel.org, Andi Kleen <andi@...stfloor.org> Subject: Re: [RFC][PATCH] irq_work On Thu, 2010-06-24 at 15:27 +0800, Huang Ying wrote: > On Thu, 2010-06-24 at 15:19 +0800, Peter Zijlstra wrote: > > 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. > > I think it is not a good idea to add overhead in such a hot path if the > overhead can be avoided. True, but I really don't like the softirq thing, and I really don't care about !APIC machines, I probably couldn't buy one if I wanted to and its not like we have good MCE support for them now, so who cares. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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