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Date: Mon, 12 Apr 2010 10:22:18 +0200
From: Ingo Molnar <mingo@elte.hu>
Subject: Re: hugepages will matter more in the future
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To: Nick Piggin <npiggin@suse.de>
Cc: Avi Kivity <avi@redhat.com>, Linus Torvalds <torvalds@linux-foundation.org>, Jason Garrett-Glaser <darkshikari@gmail.com>, Mike Galbraith <efault@gmx.de>, Andrea Arcangeli <aarcange@redhat.com>, 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>, Arjan van de Ven <arjan@infradead.org>
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* Nick Piggin <npiggin@suse.de> wrote:

> >  2) or we accept the fact that the application space is shifting to the
> >     meta-kernels - and then we should agressively optimize Linux for those
> >     meta-kernels and not pretend that they are 'specialized'. They literally
> >     represent tens of thousands of applications apiece.
> 
> And if meta-kernels (or whatever you want to call a common or important 
> workload) see some speedup that is deemed to be worth the cost of the patch, 
> then it will probably get merged. Same as anything else.

I call a 'meta kernel' something that people code thousands of apps for, 
instead of coding on the native kernel. JVM/DBs/Firefox are such frameworks. 
(you can call it middleware i guess)

By all means they are not a 'single special-purpose workload' but represent 
literally tens of thousands of apps.

	Ingo

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