From: Peter Zijlstra <peterz@infradead.org>
To: Jonas Aaberg <jonas.aberg@stericsson.com>
Cc: linux-kernel@vger.kernel.org,
Russell King <linux@arm.linux.org.uk>,
Linus Walleij <linus.walleij@stericsson.com>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: RFC [PATCH] SMP: Don't schedule tasks on inactive cpu(s)
Date: Wed, 29 Feb 2012 12:03:04 +0100 [thread overview]
Message-ID: <1330513384.11248.129.camel@twins> (raw)
In-Reply-To: <1330512150-20727-1-git-send-email-jonas.aberg@stericsson.com>
On Wed, 2012-02-29 at 11:42 +0100, Jonas Aaberg wrote:
> This patch removes the ability to schedule tasks on cpus that are online,
> but not active. The reason for this patch is that during cpu hotplug
> on ARM (atleast) there is a short window where cpuX (X > 0) is online, but
> busy-waiting on cpu0 to put it active, meanwhile cpu0 can be interrupted
> and try to schedule something on the cpu that is busy checking its active bit.
https://lkml.org/lkml/2011/12/15/255
that one?
I _think_ its correct, but it would be so good if someone else could
verify.
next prev parent reply other threads:[~2012-02-29 11:03 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-29 10:42 RFC [PATCH] SMP: Don't schedule tasks on inactive cpu(s) Jonas Aaberg
2012-02-29 11:03 ` Peter Zijlstra [this message]
2012-02-29 11:48 ` Peter Zijlstra
2012-03-02 10:51 ` Jonas Aaberg
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