linux-kernel - Re: [PATCH] vmscan: page_check_references() check low order lumpy reclaim properly

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Message-Id: <20100416143134.27B9.A69D9226@jp.fujitsu.com>
Date:	Fri, 16 Apr 2010 14:33:36 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Minchan Kim <minchan.kim@...il.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	Wu Fengguang <fengguang.wu@...el.com>,
	Andreas Mohr <andi@...as.de>, Jens Axboe <axboe@...nel.dk>,
	Linux Memory Management List <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rik van Riel <riel@...hat.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>
Subject: Re: [PATCH] vmscan: page_check_references() check low order lumpy  reclaim properly

> > +       /*
> > +        * If we need a large contiguous chunk of memory, or have
> > +        * trouble getting a small set of contiguous pages, we
> > +        * will reclaim both active and inactive pages.
> > +        */
> > +       if (sc->order > PAGE_ALLOC_COSTLY_ORDER)
> > +               sc->lumpy_reclaim = 1;
> > +       else if (sc->order && priority < DEF_PRIORITY - 2)
> > +               sc->lumpy_reclaim = 1;
> > +       else
> > +               sc->lumpy_reclaim = 0;
> 
> How about making new function for readability instead of nesting else?
> int is_lumpy_reclaim(struct scan_control *sc)
> {
> ....
> }
> 
> If you merge patch reduced stack usage of reclaim path, I think it's
> enough alone scan_control argument.
> It's just nitpick. :)
> If you don't mind, ignore, please.

Good opinion. I don't hope introduce the dependency of "reduced stack usage"
series. but I agree that I'll push your proposal later and separately.



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