linux-kernel - Re: [PATCH, v2] anon_vmas: Convert the rwsem to an rwlock

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Message-Id: <20130930100351.7843a62b.akpm@linux-foundation.org>
Date:	Mon, 30 Sep 2013 10:03:51 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Waiman Long <Waiman.Long@...com>, Ingo Molnar <mingo@...e.hu>,
	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>,
	Andrea Arcangeli <aarcange@...hat.com>,
	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>
Subject: Re: [PATCH, v2] anon_vmas: Convert the rwsem to an rwlock_t

On Sat, 28 Sep 2013 21:52:07 +0200 Ingo Molnar <mingo@...nel.org> wrote:

> Here's a an almost totally untested patch to convert the anon vma lock to 
> an rwlock_t.

Both the anon vma lock and i_mmap_lock used to be spinlocks.  Peter
turned them both into sleeping locks in this series:
https://lkml.org/lkml/2011/4/1/141

Later, Ingo turned the anon vma lock from an rwsem into a mutex
(https://lkml.org/lkml/2012/12/1/141) to permit a scalability fix
(https://lkml.org/lkml/2012/12/1/142).

Let's convince ourselves that we won't be undoing things which will
return to bite us?

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