linux-kernel - Re: [RFC:Patch: 000/008](memory hotplug) rough idea of pgdat removing

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Message-ID: <489888FB.9060401@linux-foundation.org>
Date:	Tue, 05 Aug 2008 12:08:11 -0500
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Mel Gorman <mel@....ul.ie>
CC:	Yasunori Goto <y-goto@...fujitsu.com>,
	Badari Pulavarty <pbadari@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm <linux-mm@...ck.org>,
	Linux Kernel ML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC:Patch: 000/008](memory hotplug) rough idea of pgdat removing

Mel Gorman wrote:

> Maybe I am missing something, but what is wrong with stop_machine during
> memory hot-remove?

Reclaim can sleep while going down a zonelist. There would need to be some
form of synchronization to avoid removing a zone from the zonelist that we are
just scanning.
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