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

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Message-ID: <20130930182112.GA6931@two.firstfloor.org>
Date:	Mon, 30 Sep 2013 20:21:12 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.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

> Nvidia is now also going to use mmu notifier to allow the GPU (acting
> as a secondary MMU with pagetables) to access main memory without

That's a good point. iirc AMD GPUs are also going into 
the same direction, and likely more. So we probably need
to support that usage.

Too bad :-/

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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