linux-kernel - Re: [RFC][PATCH 0/8] Speculative pagefault -v3

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Message-ID: <1262641573.6408.434.camel@laptop>
Date:	Mon, 04 Jan 2010 22:46:13 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Rik van Riel <riel@...hat.com>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	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>,
	cl@...ux-foundation.org,
	"hugh.dickins" <hugh.dickins@...cali.co.uk>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [RFC][PATCH 0/8] Speculative pagefault -v3

On Mon, 2010-01-04 at 16:41 -0500, Rik van Riel wrote:
> On 01/04/2010 01:24 PM, Peter Zijlstra wrote:
> > Patch series implementing speculative page faults for x86.
> 
> Fun, but why do we need this?

People were once again concerned with mmap_sem contention on threaded
apps on large machines. Kame-san posted some patches, but I felt they
weren't quite crazy enough ;-)

> What improvements did you measure?

I got it not to crash :-) Although I'd not be surprised if other people
do manage, it needs more eyes.

> I'll take a look over the patches to see whether they're
> sane...

More appreciated, thanks!

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