linux-kernel - Re: [PATCH resend] mm: drain percpu lru add/rotate page-vectors on cpu hot-unplug

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Message-Id: <20120229123818.61a61e9d.akpm@linux-foundation.org>
Date:	Wed, 29 Feb 2012 12:38:18 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Johannes Weiner <jweiner@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Subject: Re: [PATCH resend] mm: drain percpu lru add/rotate page-vectors on
 cpu hot-unplug

On Tue, 28 Feb 2012 23:40:45 +0400
Konstantin Khlebnikov <khlebnikov@...nvz.org> wrote:

> This cpu hotplug hook was accidentally removed in commit v2.6.30-rc4-18-g00a62ce
> ("mm: fix Committed_AS underflow on large NR_CPUS environment")

That was a long time ago - maybe we should leave it removed ;) I mean,
did this bug(?) have any visible effect?  If so, what was that effect?

IOW, the changelog didn't give anyone any reason to apply the patch to
anything!
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