From: Christoph Hellwig <hch@caldera.de>
To: Manfred Spraul <manfred@colorfullife.com>
Cc: Christoph Hellwig <hch@caldera.de>,
Thomas Widmann <thomas.widmann@icn.siemens.de>,
linux-kernel@vger.kernel.org,
Nick Pollitt <npollitt@engr.sgi.com>
Subject: Re: SMP: bind process to cpu
Date: Sat, 17 Feb 2001 18:47:56 +0100 [thread overview]
Message-ID: <20010217184756.A15263@caldera.de> (raw)
In-Reply-To: <200102171327.OAA00342@ns.caldera.de> <3A8E8719.DD58EB7C@colorfullife.com>
In-Reply-To: <3A8E8719.DD58EB7C@colorfullife.com>; from manfred@colorfullife.com on Sat, Feb 17, 2001 at 03:13:45PM +0100
[Nick, I've added you to the Cc list so you can look at
it for future versions of your patch]
On Sat, Feb 17, 2001 at 03:13:45PM +0100, Manfred Spraul wrote:
> You must also update wake_process_synchroneous(), otherwise you can get
> lost wakeups with pipes.
>
> Something like
>
> > if (!(p->cpus_allowed & (1 << smp_processor_id()))
> > reschedule_idle(p);
>
> must be added after add_to_runqueue().
Ok.
> Ingo Molnar did some testing with tux2, and under high load wakeups were
> lost without such a patch.
(s/tux2/tux/ I suppose)
Yepp - but tux is again not userspace...
Christoph
--
Of course it doesn't work. We've performed a software upgrade.
next prev parent reply other threads:[~2001-02-17 18:15 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-02-17 12:36 SMP: bind process to cpu Thomas Widmann
2001-02-17 13:27 ` Christoph Hellwig
2001-02-17 14:13 ` Manfred Spraul
2001-02-17 17:47 ` Christoph Hellwig [this message]
2001-02-17 14:37 ` Andrew Morton
2001-02-17 19:08 ` Thomas Widmann
2001-02-17 19:57 ` Francis Galiegue
2001-02-18 1:01 ` Andrew Morton
2001-02-17 19:49 ` Tim Hockin
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