linux-kernel - Re: [RFC][patch 2/5] mm: Node-setup agnostic free

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Message-ID: <20080416184816.GA4400@elte.hu>
Date:	Wed, 16 Apr 2008 20:48:16 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Yinghai Lu <yhlu.kernel@...il.com>
Cc:	Johannes Weiner <hannes@...urebad.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux MM <linux-mm@...ck.org>,
	Andi Kleen <andi@...stfloor.org>,
	Yasunori Goto <y-goto@...fujitsu.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Christoph Lameter <clameter@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
Subject: Re: [RFC][patch 2/5] mm: Node-setup agnostic free_bootmem()


* Yinghai Lu <yhlu.kernel@...il.com> wrote:

> >  Yes, it should work well with cross nodes case.
> >
> >  but please add boundary check on free_bootmem_node too.
> 
> also please note: it will have problem span nodes box.
> 
> for example: node 0: 0-2g, 4-6g, node1: 2-4g, 6-8g. and if ramdisk sit 
> creoss 2G boundary. you will only free the range before 2g.

yes. Such systems _will_ become more common - so the "this is rare" 
arguments are incorrect. bootmem has to be robust enough to deal with 
it.

	Ingo
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