linux-kernel - Re: [patch 05/19] split LRU lists into anon & file sets

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Message-ID: <20080111111537.6bd2f5e4@bree.surriel.com>
Date:	Fri, 11 Jan 2008 11:15:37 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Lee Schermerhorn <Lee.Schermerhorn@...com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [patch 05/19] split LRU lists into anon & file sets

On Fri, 11 Jan 2008 10:59:18 -0500
Lee Schermerhorn <Lee.Schermerhorn@...com> wrote:

> On Fri, 2008-01-11 at 10:42 -0500, Rik van Riel wrote:
> > On Fri, 11 Jan 2008 15:24:34 +0900
> > KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:
> > 
> > > below patch is a bit cleanup proposal.
> > > i think LRU_FILE is more clarify than "/2".
> > > 
> > > What do you think it?
> > 
> > Thank you for the cleanup, your version looks a lot nicer.  
> > I have applied your patch to my series.
> > 
> 
> Rik:  
> 
> I think we also want to do something like:
> 
> -	BUILD_BUG_ON(LRU_INACTIVE_FILE != 2 || LRU_ACTIVE_FILE != 3);
> +	BUILD_BUG_ON(LRU_INACTIVE_FILE != 2 || LRU_ACTIVE_FILE != 3 ||
> +		NR_LRU_LISTS > 6);
> 
> Then we'll be warned if future change might break our implicit
> assumption that any lru_list value with '0x2' set is a file lru.

Restoring the code to your original version makes things work again.

OTOH, I almost wonder if we should not simply define it to

	return (l == LRU_INACTIVE_FILE || l == LRU_ACTIVE_FILE)

and just deal with it.

Your version of the code is correct and probably faster, but not as
easy to read and probably not in a hot path :)

-- 
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