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Date: Mon, 12 Apr 2010 16:53:29 +0300
From: Avi Kivity <avi@redhat.com>
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Subject: Re: hugepages will matter more in the future
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To: Andrea Arcangeli <aarcange@redhat.com>
Cc: Arjan van de Ven <arjan@infradead.org>, Ingo Molnar <mingo@elte.hu>, Jason Garrett-Glaser <darkshikari@gmail.com>, Mike Galbraith <efault@gmx.de>, Linus Torvalds <torvalds@linux-foundation.org>, Pekka Enberg <penberg@cs.helsinki.fi>, Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org, Marcelo Tosatti <mtosatti@redhat.com>, Adam Litke <agl@us.ibm.com>, Izik Eidus <ieidus@redhat.com>, Hugh Dickins <hugh.dickins@tiscali.co.uk>, Nick Piggin <npiggin@suse.de>, Rik van Riel <riel@redhat.com>, Mel Gorman <mel@csn.ul.ie>, Dave Hansen <dave@linux.vnet.ibm.com>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Mike Travis <travis@sgi.com>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, Christoph Lameter <cl@linux-foundation.org>, Chris Wright <chrisw@sous-sol.org>, bpicco@redhat.com, KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>, Balbir Singh <balbir@linux.vnet.ibm.com>, Arnd Bergmann <arnd@arndb.de>, "Michael S. Tsirkin" <mst@redhat.com>, Peter Zijlstra <peterz@infradead.org>, Johannes Weiner <hannes@cmpxchg.org>, Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
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On 04/12/2010 04:39 PM, Andrea Arcangeli wrote:
> On Mon, Apr 12, 2010 at 04:33:50PM +0300, Avi Kivity wrote:
>    
>> So where does the pagetable go?
>>      
> They're preallocated together with the hugepage and queued into the mm
> to retain locality. This way a huge pmd can be converted to a regular
> pmd pointing to the preallocated pte on the fly without GFP_KERNEL
> allocations.
>    

Oh.  Well I hope this can be eliminated in the future somehow.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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