linux-kernel - Re: [PATCH v2 1/2] vmscan: don't subtraction of unsined

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Message-Id: <20100714110614.EA7B.A69D9226@jp.fujitsu.com>
Date:	Wed, 14 Jul 2010 11:15:29 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	kosaki.motohiro@...fujitsu.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>, Mel Gorman <mel@....ul.ie>,
	Rik van Riel <riel@...hat.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH v2 1/2] vmscan: don't subtraction of unsined

> On Tue, 13 Jul 2010, KOSAKI Motohiro wrote:
> 
> > Christoph, Can we hear your opinion about to add new branch in slab-free path?
> > I think this is ok, because reclaim makes a lot of cache miss then branch
> > mistaken is relatively minor penalty. thought?
> 
> Its on the slow path so I would think that should be okay. But is this
> really necessary? Working with the per zone slab reclaim counters is not
> enough? We are adding counter after counter that have similar purposes and
> the handling gets more complex.
> 
> Maybe we can get rid of the code in the slabs instead by just relying on
> the difference of the zone counters?

Okey, I agree. I'm pending this work at once. and I'll (probably) resume it
after Nick's work merged.

Thanks.




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