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

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Message-ID: <alpine.LFD.2.00.1001072058010.7821@localhost.localdomain>
Date:	Thu, 7 Jan 2010 21:00:34 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Arjan van de Ven <arjan@...radead.org>
cc:	Christoph Lameter <cl@...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, Arjan van de Ven wrote:
> 
> if an app has to change because our kernel sucks (for no good reason),
> "change the app" really is the lame type of answer.

Well, in all fairness, I doubt other kernels do any better. So changing 
the app is likely to help in general, and thus be at least part of the 
right solution.

But as outlined, we _can_ almost certainly do better on many simple and 
common cases, so changing the kernel - in addition to fixing app memory 
allocation patterns - sounds like a good avenue.

			Linus
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