From: Andi Kleen <ak@suse.de>
To: "Aaron Durbin" <adurbin@google.com>
Cc: linux-kernel@vger.kernel.org, akpm@osdl.org
Subject: Re: [PATCH] x86_64: Avoid NMI Watchdog and/or long wait in setup_APIC_timer
Date: Thu, 9 Aug 2007 02:50:43 +0200 [thread overview]
Message-ID: <200708090250.43467.ak@suse.de> (raw)
In-Reply-To: <8f95bb250708081744le5e5216k13087d05211a4056@mail.gmail.com>
>
> I was thinking along the same lines as well, but I really didn't know how
> important all that code was for waiting for the next irq slice. I'm not time
> expert, but I would imagine we would resynchronize correctly in the future after
> this code path?
The idea is to just have the apic timers roughly at the same times + some fixed
offset as the main timer. Otherwise e.g. add_timer could jitter up to a jiffie
regarding the jiffies counter. But long term drift will destroy the synchronization
anyways.
I guess i'll send it in anyways for .23; it would be too risky to change anything
radical in this area that late. Then later it can be revisited.
-Andi
next prev parent reply other threads:[~2007-08-09 0:50 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-08 23:17 [PATCH] x86_64: Avoid NMI Watchdog and/or long wait in setup_APIC_timer Aaron Durbin
2007-08-09 0:26 ` Andi Kleen
2007-08-09 0:44 ` Aaron Durbin
2007-08-09 0:50 ` Andi Kleen [this message]
2007-08-09 20:30 ` Andrew Morton
2007-08-09 21:16 ` Aaron Durbin
2007-08-09 21:56 ` Andrew Morton
-- strict thread matches above, loose matches on Subject: below --
2007-08-09 3:45 Aaron Durbin
2007-08-08 23:08 Aaron Durbin
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