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

From:  Peter Zijlstra <>
To:  Rik van Riel <>
Subject:  Re: [RFC][PATCH 0/8] Speculative pagefault -v3
Date:  Mon, 04 Jan 2010 22:46:13 +0100
Cc:  "Paul E. McKenney" <>, KAMEZAWA Hiroyuki <>, "" <>, "" <>, "" <>,, "hugh.dickins" <>, Nick Piggin <>, Ingo Molnar <>, Linus Torvalds <>
Archive-link:  Article, Thread

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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