linux-kernel - Re: [PATCH 08 of 11] anon-vma-rwsem

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Message-Id: <1210743839.8297.55.camel@pasglop>
Date:	Tue, 13 May 2008 22:43:59 -0700
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	Andrea Arcangeli <andrea@...ranet.com>,
	Andrew Morton <akpm@...ux-foundation.org>, clameter@....com,
	steiner@....com, holt@....com, npiggin@...e.de,
	a.p.zijlstra@...llo.nl, kvm-devel@...ts.sourceforge.net,
	kanojsarcar@...oo.com, rdreier@...co.com,
	swise@...ngridcomputing.com, linux-kernel@...r.kernel.org,
	avi@...ranet.com, linux-mm@...ck.org,
	general@...ts.openfabrics.org, hugh@...itas.com,
	rusty@...tcorp.com.au, aliguori@...ibm.com, chrisw@...hat.com,
	marcelo@...ck.org, dada1@...mosbay.com, paulmck@...ibm.com
Subject: Re: [PATCH 08 of 11] anon-vma-rwsem


On Tue, 2008-05-13 at 22:14 +1000, Nick Piggin wrote:
> ea.
> 
> I don't see why you're bending over so far backwards to accommodate
> this GRU thing that we don't even have numbers for and could actually
> potentially be batched up in other ways (eg. using mmu_gather or
> mmu_gather-like idea).

I agree, we're better off generalizing the mmu_gather batching
instead...

I had some never-finished patches to use the mmu_gather for pretty much
everything except single page faults, tho various subtle differences
between archs and lack of time caused me to let them take the dust and
not finish them...

I can try to dig some of that out when I'm back from my current travel,
though it's probably worth re-doing from scratch now.

Ben.


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