linux-kernel - Re: [PATCH 0/4] per anon_vma lock and turn anon_vma rwsem lock to rwlock

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Message-ID: <1383328187.2653.5.camel@buesod1.americas.hpqcorp.net>
Date:	Fri, 01 Nov 2013 10:49:47 -0700
From:	Davidlohr Bueso <davidlohr@...com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Yuanhan Liu <yuanhan.liu@...ux.intel.com>,
	Tim Chen <tim.c.chen@...ux.intel.com>,
	Davidlohr Bueso <davidlohr.bueso@...com>,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Michel Lespinasse <walken@...gle.com>
Subject: Re: [PATCH 0/4] per anon_vma lock and turn anon_vma rwsem lock to
 rwlock_t

On Fri, 2013-11-01 at 09:01 +0100, Ingo Molnar wrote:
> * Yuanhan Liu <yuanhan.liu@...ux.intel.com> wrote:
> 
> > Patch 1 turns locking the anon_vma's root to locking itself to let it be
> > a per anon_vma lock, which would reduce contentions.
> > 
> > In the same time, lock range becomes quite small then, which is bascially
> > a call of anon_vma_interval_tree_insert(). Patch 2 turn rwsem to rwlock_t.
> > It's a patch made from Ingo, I just made some change to let it apply based on
> > patch 1.

Andrea's last input from this kind of conversion is that it cannot be
done (at least yet): https://lkml.org/lkml/2013/9/30/53

Thanks,
Davidlohr

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