linux-kernel - Re: [PATCH] anon_vmas: Convert the rwsem to an rwlock

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Message-ID: <CA+55aFxG3hK0CiZJh1XORv+tiNWXVxh8rzr37Vmu=ASWj1s4PQ@mail.gmail.com>
Date:	Mon, 30 Sep 2013 09:26:21 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	Ingo Molnar <mingo@...nel.org>, Waiman Long <Waiman.Long@...com>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Rik van Riel <riel@...hat.com>,
	Peter Hurley <peter@...leysoftware.com>,
	Davidlohr Bueso <davidlohr.bueso@...com>,
	Alex Shi <alex.shi@...el.com>,
	Tim Chen <tim.c.chen@...ux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Matthew R Wilcox <matthew.r.wilcox@...el.com>,
	Dave Hansen <dave.hansen@...el.com>,
	Michel Lespinasse <walken@...gle.com>,
	Andi Kleen <andi@...stfloor.org>,
	"Chandramouleeswaran, Aswin" <aswin@...com>,
	"Norton, Scott J" <scott.norton@...com>,
	Haggai Eran <haggaie@...lanox.com>,
	Sagi Grimberg <sagig@...lanox.com>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Jerome Glisse <jglisse@...hat.com>
Subject: Re: [PATCH] anon_vmas: Convert the rwsem to an rwlock_t

On Mon, Sep 30, 2013 at 1:52 AM, Andrea Arcangeli <aarcange@...hat.com> wrote:
>
> Sorry having to break the party but the sleepable locks for anon_vma
> and i_mmap_mutex are now requirement for the "pageable RDMA" effort
> recently achieved upstream by mellanox with the MMU notifier.

I'll happily break that.

No way will some random crazy RDMA be a reason why we'd drop this kind
of improvement on actual loads that matter way more.

                 Linus
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