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Date: Sun, 11 Apr 2010 21:40:10 +0200
From: Andrea Arcangeli <aarcange@redhat.com>
Subject: Re: hugepages will matter more in the future
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To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Ingo Molnar <mingo@elte.hu>, Avi Kivity <avi@redhat.com>, Jason Garrett-Glaser <darkshikari@gmail.com>, Mike Galbraith <efault@gmx.de>, 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>, Arjan van de Ven <arjan@infradead.org>
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On Sun, Apr 11, 2010 at 08:22:04AM -0700, Linus Torvalds wrote:
>  - magic libc malloc flags tghat are totally and utterly unrealistic in 
>    anything but a benchmark
> 
>  - by basically keeping one CPU totally busy doing defragmentation.

This is a red herring. This is the last thing we want, and we'll run
even faster if we could make current glibc binaries to cooperate. But
this is a new feature and it'll require changing glibc slightly.

Future glibc will be optimal and it won't require khugepaged don't
worry.

I got crashes in page_mapcount != number of huge_pmd mapping the page
in split_huge_page because of the anon-vma bug, so I had to back it
out, this is why it's stable now.

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