linux-kernel - Re: [PATCH] flush_cpu_workqueue: don't flush an empty ->worklist

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Message-ID: <20070117162501.GF26211@in.ibm.com>
Date:	Wed, 17 Jan 2007 21:55:01 +0530
From:	Srivatsa Vaddagiri <vatsa@...ibm.com>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Andrew Morton <akpm@...l.org>, David Howells <dhowells@...hat.com>,
	Christoph Hellwig <hch@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...l.org>,
	linux-kernel@...r.kernel.org, Gautham shenoy <ego@...ibm.com>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
Subject: Re: [PATCH] flush_cpu_workqueue: don't flush an empty ->worklist

On Wed, Jan 17, 2007 at 06:47:16PM +0300, Oleg Nesterov wrote:
> Btw, I agree it is good to have a sleeping lock to protect cpu_online_map.
> But it should be separate from workqueue_mutex, and it is not needed for
> create/destroy/flush funcs.

Which is what lock_cpu_hotplug() attempted to provide but which
has recd lot of flak in recent days. I guess if someone implements
process freezer based locking of cpu_online_map, we will know better how 
suited later is for cpu hotplug.

-- 
Regards,
vatsa
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