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Date: Mon, 12 Apr 2010 13:10:46 +0300
From: Avi Kivity <avi@redhat.com>
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Subject: Re: [PATCH 00 of 41] Transparent Hugepage Support #17
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To: Andrea Arcangeli <aarcange@redhat.com>
Cc: Nick Piggin <npiggin@suse.de>, Ingo Molnar <mingo@elte.hu>, Mike Galbraith <efault@gmx.de>, Jason Garrett-Glaser <darkshikari@gmail.com>, 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>, 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 01:08 PM, Andrea Arcangeli wrote:
> On Mon, Apr 12, 2010 at 01:02:34PM +0300, Avi Kivity wrote:
>    
>> The only scenario I can see where it degrades is that you have a dcache
>> load that spills over to all of memory, then falls back leaving a pinned
>> page in every huge frame.  It can happen, but I don't see it as a likely
>> scenario.  But maybe I'm missing something.
>>      
> And in my understanding this is exactly the scenario that kernelcore=
> should prevent from ever materialize. Providing math guarantees
> without kernelcore= is probably futile.
>    

Well, that forces the user to make a different boot-time tradeoff.  It's 
unsatisfying.

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

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