linux-kernel - Re: Subject: [RFC MM] mmap_sem scaling: Use mutex and percpu counter instead

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Date:	Sat, 7 Nov 2009 13:19:33 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	npiggin@...e.de, linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Tejun Heo <tj@...nel.org>, Ingo Molnar <mingo@...e.hu>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	"hugh.dickins@...cali.co.uk" <hugh.dickins@...cali.co.uk>
Subject: Re: Subject: [RFC MM] mmap_sem scaling: Use mutex and percpu counter 
	instead

On Sat, Nov 7, 2009 at 2:10 AM, Christoph Lameter
<cl@...ux-foundation.org> wrote:
> On Sat, 7 Nov 2009, Minchan Kim wrote:
>
>> How about change from 'mm_readers' to 'is_readers' to improve your
>> goal 'scalibility'?
>
> Good idea. Thanks. Next rev will use your suggestion.
>
> Any creative thoughts on what to do about the 1 millisecond wait period?
>

Hmm,
it would be importatn to prevent livelock for reader to hold lock
continuously before
hodling writer than 1 msec write ovhead.
First of all, After we solve it, second step is that optimize write
overhead, I think.

-- 
Kind regards,
Minchan Kim
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