linux-kernel - Re: [mm][RFC][PATCH 0/11] mm accessor updates.

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Message-ID: <20091217195530.GM9804@basil.fritz.box>
Date:	Thu, 17 Dec 2009 20:55:30 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Peter Zijlstra <peterz@...radead.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>, cl@...ux-foundation.org,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"mingo@...e.hu" <mingo@...e.hu>, minchan.kim@...il.com
Subject: Re: [mm][RFC][PATCH 0/11] mm accessor updates.

On Thu, Dec 17, 2009 at 11:08:04AM -0800, Paul E. McKenney wrote:
> On Thu, Dec 17, 2009 at 06:53:39PM +0100, Andi Kleen wrote:
> > > OK, I have to ask...
> > > 
> > > Why not just use the already-existing SRCU in this case?
> > 
> > You right, SRCU could work. 
> > 
> > Still needs a lot more work of course.
> 
> As discussed with Peter on IRC, I have been idly thinking about how I
> would implement SRCU if I were starting on it today.  If you would like
> to see some specific improvements to SRCU, telling me about them would
> greatly increase the probability of my doing something about them.  ;-)

I think actual RCU improvements are pretty low on the list for this
one, so far we're not even completely sure how it would all work
on the high level.

mmap_sem is a nasty lock, handlings lots of different things.

-Andi

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