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

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Message-Id: <20100105092836.a7feb26c.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 5 Jan 2010 09:28:36 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	Rik van Riel <riel@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"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>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [RFC][PATCH 0/8] Speculative pagefault -v3

On Mon, 4 Jan 2010 15:59:45 -0600 (CST)
Christoph Lameter <cl@...ux-foundation.org> wrote:

> On Mon, 4 Jan 2010, Rik van Riel wrote:
> 
> > Fun, but why do we need this?
> >
> > What improvements did you measure?
> 
> If it measures up to Kame-sans approach then the possible pagefault rate
> will at least double ...
> 
On 4-core/2 socket machine ;)

More than page fault rate, important fact is that we can reduce cache contention
by skipping mmap_sem in some situation.

And I think we have some chances.

Thanks,
-Kame

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