From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail202.messagelabs.com (mail202.messagelabs.com [216.82.254.227]) by kanga.kvack.org (Postfix) with SMTP id 442576B004F for ; Tue, 12 May 2009 07:47:35 -0400 (EDT) Date: Tue, 12 May 2009 19:48:07 +0800 From: Wu Fengguang Subject: Re: [PATCH -mm] vmscan: merge duplicate code in shrink_active_list() Message-ID: <20090512114807.GC5926@localhost> References: <20090501123541.7983a8ae.akpm@linux-foundation.org> <20090503031539.GC5702@localhost> <1241432635.7620.4732.camel@twins> <20090507121101.GB20934@localhost> <20090507151039.GA2413@cmpxchg.org> <20090507134410.0618b308.akpm@linux-foundation.org> <20090508081608.GA25117@localhost> <20090508125859.210a2a25.akpm@linux-foundation.org> <20090512025319.GD7518@localhost> <20090512162633.352313d6.minchan.kim@barrios-desktop> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090512162633.352313d6.minchan.kim@barrios-desktop> Sender: owner-linux-mm@kvack.org To: Minchan Kim Cc: Andrew Morton , "hannes@cmpxchg.org" , "peterz@infradead.org" , "riel@redhat.com" , "linux-kernel@vger.kernel.org" , "tytso@mit.edu" , "linux-mm@kvack.org" , "elladan@eskimo.com" , "npiggin@suse.de" , "cl@linux-foundation.org" , "kosaki.motohiro@jp.fujitsu.com" List-ID: On Tue, May 12, 2009 at 03:26:33PM +0800, Minchan Kim wrote: > On Tue, 12 May 2009 10:53:19 +0800 > Wu Fengguang 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 > > --- > > 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org