linux-kernel - Re: [PATCH 0 of 3] mmu notifier v18 for -mm

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Message-ID: <486B0B0F.5010605@qumranet.com>
Date:	Wed, 02 Jul 2008 07:58:55 +0300
From:	Avi Kivity <avi@...ranet.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Andrea Arcangeli <andrea@...ranet.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Christoph Lameter <clameter@....com>,
	Jack Steiner <steiner@....com>, Robin Holt <holt@....com>,
	Nick Piggin <npiggin@...e.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>, kvm@...r.kernel.org,
	Kanoj Sarcar <kanojsarcar@...oo.com>,
	Roland Dreier <rdreier@...co.com>,
	Steve Wise <swise@...ngridcomputing.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	general@...ts.openfabrics.org, Hugh Dickins <hugh@...itas.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Anthony Liguori <aliguori@...ibm.com>,
	Chris Wright <chrisw@...hat.com>,
	Marcelo Tosatti <marcelo@...ck.org>,
	Eric Dumazet <dada1@...mosbay.com>,
	"Paul E. McKenney" <paulmck@...ibm.com>,
	Izik Eidus <izike@...ranet.com>, Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH 0 of 3] mmu notifier v18 for -mm

Andrew Morton wrote:
> On Thu, 26 Jun 2008 02:26:56 +0200 Andrea Arcangeli <andrea@...ranet.com> wrote:
>
>   
>> Hello,
>>
>> Christoph suggested me to repost v18 for merging in -mm, to give it more
>> exposure before the .27 merge window opens. There's no code change compared to
>> the previous v18 submission (the only change is the correction in the comment
>> in the mm_take_all_locks patch rightfully pointed out by Linus).
>>
>> Full patchset including other XPMEM support patches can be found here:
>>
>> 	http://www.kernel.org/pub/linux/kernel/people/andrea/patches/v2.6/2.6.26-rc7/mmu-notifier-v18
>>
>> Only the three patches of the patchset I'm submitting here by email are ready
>> for merging, the rest you can find in the website is not ready for merging yet
>> for various performance degradations, lots of the XPMEM patches needs to be
>> elaborated to avoid any slowdown for the non-XPMEM case, but I keep
>> maintaining them to make life easier to XPMEM current development and later we
>> can keep work on them to make them suitable for inclusion to avoid any
>> performance degradation risk.
>>     
>
> I'm a bit concerned about merging the first three patches when there
> are eleven more patches of which some, afacit, are required to make
> these three actually useful.  Committing these three would be signing a
> blank cheque.
>
>   

The first three are useful for kvm, gru, and likely drm and rdma nics.

It is only xpmem which requires the other eleven patches.

> Because if we hit strong objections with the later patches we end up in a
> cant-go-forward, cant-go-backward situation.
>
>   

No, we end up in a some-people-are-happy, 
some-have-to-redo-their-homework situation.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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