From: Andi Kleen <ak@suse.de>
To: "David S. Miller" <davem@davemloft.net>
Cc: linux-kernel@vger.kernel.org, mingo@elte.hu
Subject: Re: softlockup interaction with slow consoles
Date: Tue, 21 Feb 2006 21:43:46 +0100 [thread overview]
Message-ID: <200602212143.46721.ak@suse.de> (raw)
In-Reply-To: <20060221.121948.60060362.davem@davemloft.net>
On Tuesday 21 February 2006 21:19, David S. Miller wrote:
> From: Andi Kleen <ak@suse.de>
> Date: Tue, 21 Feb 2006 21:05:37 +0100
>
> > The classic way is to just use touch_nmi_watchdog() somewhere
> > in the loop that does work. That touches the softwatchdog too
> > these days.
>
> "jiffies" aren't advancing, since interrupts are disabled by
> release_console_sem(), so that doesn't work.
>
> I tried that already :-)
Ah I see the problem I guess. When you restart then your
timer interrupt catches up the missing jiffies very quickly
and that triggers the softwatchdog.
Nasty. Perhaps it needs to look at xtime instead and
let touch_softlockup_watchdog() update that. But that could
break with NTP then. Perhaps using monotonic_clock() ?
-Andi
next prev parent reply other threads:[~2006-02-21 21:00 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-20 21:18 softlockup interaction with slow consoles David S. Miller
2006-02-21 9:09 ` Ingo Molnar
2006-02-21 9:16 ` David S. Miller
2006-02-21 13:49 ` Andi Kleen
2006-02-21 20:01 ` David S. Miller
2006-02-21 20:05 ` Andi Kleen
2006-02-21 20:19 ` David S. Miller
2006-02-21 20:27 ` Dave Jones
2006-02-21 20:50 ` David S. Miller
2006-02-21 20:43 ` Andi Kleen [this message]
2006-02-21 19:23 ` Matt Mackall
2006-02-21 19:58 ` David S. Miller
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