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

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Message-Id: <20091216193109.778b881b.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 16 Dec 2009 19:31:09 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	"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 Wed, 16 Dec 2009 11:28:06 +0100
Andi Kleen <andi@...stfloor.org> wrote:

> > > Also the patches didn't fare too well in testing unfortunately.
> > > 
> > > I suspect we'll rather need multiple locks split per address
> > > space range.
> > 
> > This set doesn't include any changes of the logic. Just replace all mmap_sem.
> > I think this is good start point (for introducing another logic etc..)
> 
> The problem is that for range locking simple wrapping the locks
> in macros is not enough. You need more changes.
> 
maybe. but removing scatterred mmap_sem from codes is the first thing to do.
I think this removing itself will take 3 month or a half year.
(So, I didn't remove mmap_sem and leave it as it is.)

The problem of range locking is more than mmap_sem, anyway. I don't think
it's possible easily.

But ok, if no one welcome this, I stop this.

Thanks,
-Kame

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