linux-kernel - Re: [PATCH -mm] vmscan: merge duplicate code in shrink_active

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Date:	Tue, 12 May 2009 19:48:07 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Minchan Kim <minchan.kim@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"hannes@...xchg.org" <hannes@...xchg.org>,
	"peterz@...radead.org" <peterz@...radead.org>,
	"riel@...hat.com" <riel@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"tytso@....edu" <tytso@....edu>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"elladan@...imo.com" <elladan@...imo.com>,
	"npiggin@...e.de" <npiggin@...e.de>,
	"cl@...ux-foundation.org" <cl@...ux-foundation.org>,
	"kosaki.motohiro@...fujitsu.com" <kosaki.motohiro@...fujitsu.com>
Subject: Re: [PATCH -mm] vmscan: merge duplicate code in
	shrink_active_list()

On Tue, May 12, 2009 at 03:26:33PM +0800, Minchan Kim wrote:
> On Tue, 12 May 2009 10:53:19 +0800
> Wu Fengguang <fengguang.wu@...el.com> wrote:
> 
> > The "move pages to active list" and "move pages to inactive list"
> > code blocks are mostly identical and can be served by a function.
> > 
> > Thanks to Andrew Morton for pointing this out.
> > 
> > Signed-off-by: Wu Fengguang <fengguang.wu@...el.com>
> > ---
> >  mm/vmscan.c |   84 ++++++++++++++++++++------------------------------
> >  1 file changed, 35 insertions(+), 49 deletions(-)
> > 
> > --- linux.orig/mm/vmscan.c
> > +++ linux/mm/vmscan.c
> > @@ -1225,6 +1225,36 @@ static inline void note_zone_scanning_pr
> >   * But we had to alter page->flags anyway.
> >   */
> >  
> > +void move_active_pages_to_lru(enum lru_list lru, struct list_head *list)
> > +{
> > +	unsigned long pgmoved = 0;
> > +
> > +	while (!list_empty(&list)) {
> > +		page = lru_to_page(&list);
> > +		prefetchw_prev_lru_page(page, &list, flags);
> > +
> > +		VM_BUG_ON(PageLRU(page));
> > +		SetPageLRU(page);
> > +
> > +		VM_BUG_ON(!PageActive(page));
> > +		if (lru < LRU_ACTIVE)
> > +			ClearPageActive(page);
> 
> Arithmetic on the LRU list is not good code for redability, I think. 
> How about adding comment? 
> 
> if (lru < LRU_ACTIVE) /* In case of moving from active list to inactive */
> 
> Ignore me if you think this is trivial. 

Good suggestion. Or this simple one: "we are de-activating"?

Thanks,
Fengguang
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