linux-kernel - Re: [PATCH 2/2] cpuhotplug: introduce try_get_online

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Message-Id: <200906011701.51637.rusty@rustcorp.com.au>
Date:	Mon, 1 Jun 2009 17:01:50 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Lai Jiangshan <laijs@...fujitsu.com>, mingo@...e.hu,
	paulmck@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	Oleg Nesterov <oleg@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 2/2] cpuhotplug: introduce try_get_online_cpus()

On Sat, 30 May 2009 06:01:18 am Andrew Morton wrote:
> I do think that we should look at
> alternative (non-trylocky) ways of fixing them.

Speculating: we could add a "keep_cpu()" (FIXME: improve name) which is kind 
of like get_cpu() only doesn't disable preemption and only stops *this* cpu 
from going down.

Not sure where that gets us, but if someone's going to dig deep into this it 
might help.

Thanks,
Rusty.
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