linux-kernel - Re: [RFC][PATCH 6/8] mm: handle_speculative

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Message-ID: <20100107204940.253ed753@infradead.org>
Date:	Thu, 7 Jan 2010 20:49:40 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"minchan.kim@...il.com" <minchan.kim@...il.com>,
	"hugh.dickins" <hugh.dickins@...cali.co.uk>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [RFC][PATCH 6/8] mm: handle_speculative_fault()

On Thu, 7 Jan 2010 10:36:52 -0600 (CST)
Christoph Lameter <cl@...ux-foundation.org> wrote:

> On Thu, 7 Jan 2010, Linus Torvalds wrote:
> 
> > You're missing what Arjan said - the jav workload does a lot of
> > memory allocations too, causing mmap/munmap.
> 
> Well isnt that tunable on the app level? Get bigger chunks of memory
> in order to reduce the frequency of mmap operations? If you want
> concurrency of faults then mmap_sem write locking currently needs to
> be limited.

if an app has to change because our kernel sucks (for no good reason),
"change the app" really is the lame type of answer.


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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