From: Andi Kleen <andi@firstfloor.org>
To: David Miller <davem@davemloft.net>
Cc: linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org
Subject: Re: NMI watchdog + NOHZ question
Date: Mon, 22 Jun 2009 10:18:50 +0200 [thread overview]
Message-ID: <87bpog3clx.fsf@basil.nowhere.org> (raw)
In-Reply-To: <20090622.002722.53993293.davem@davemloft.net> (David Miller's message of "Mon, 22 Jun 2009 00:27:22 -0700 (PDT)")
David Miller <davem@davemloft.net> writes:
>
> Is there something fundamental that should be preventing this?
Unless that changed recently when I wasn't looking NOHZ should only
stop timers when the CPU is idle. So when a driver is doing
something and the interrupts are not disabled for too long the timers
should be ticking.
Then when you're idle interrupts should be never off, so the NMI
watchdog cannot fire. On x86 often the NMI watchdog is in fact
stopped on idle.
-Andi
--
ak@linux.intel.com -- Speaking for myself only.
next prev parent reply other threads:[~2009-06-22 8:18 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-22 7:27 NMI watchdog + NOHZ question David Miller
2009-06-22 8:18 ` Andi Kleen [this message]
2009-06-22 9:27 ` David Miller
2009-06-24 0:17 ` David Miller
2009-06-24 7:03 ` Andi Kleen
2009-06-24 7:08 ` David Miller
2009-06-24 7:15 ` Andi Kleen
2009-06-24 7:17 ` David Miller
2009-06-24 7:53 ` Andi Kleen
2009-06-24 8:51 ` David Miller
2009-06-24 9:44 ` David Miller
2009-06-24 10:23 ` Andi Kleen
2009-06-24 10:32 ` David Miller
2009-06-24 10:52 ` Andi Kleen
2009-06-24 10:59 ` David Miller
2009-06-24 11:10 ` Andi Kleen
2009-09-03 9:36 ` David Miller
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