linux-kernel - Re: [PATCH 0/2] workqueue: fix a bug when numa mapping is changed

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Message-ID: <20150401030509.GM9974@htj.duckdns.org>
Date:	Tue, 31 Mar 2015 23:05:09 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Gu Zheng <guz.fnst@...fujitsu.com>, linux-kernel@...r.kernel.org,
	laijs@...fujitsu.com, isimatu.yasuaki@...fujitsu.com,
	tangchen@...fujitsu.com, izumi.taku@...fujitsu.com
Subject: Re: [PATCH 0/2] workqueue: fix a bug when numa mapping is changed

On Tue, Mar 31, 2015 at 11:02:42PM -0400, Tejun Heo wrote:
> Ugh... so, cpu number allocation on hot-add is part of userland
> interface that we're locked into?  Tying hotplug and id allocation
> order together usually isn't a good idea.  What if the cpu up fails
> while running the notifiers?  The ID is already allocated and the next
> cpu being brought up will be after a hole anyway.  Is this even
> actually gonna affect userland?

At any rate, this isn't big a deal.  If the mapping has to be dynamic,
it'd be great to move the mapping code from workqueue to cpu hotplug
proper tho.

Thanks.

-- 
tejun
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