From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail172.messagelabs.com (mail172.messagelabs.com [216.82.254.3]) by kanga.kvack.org (Postfix) with ESMTP id 197226B0083 for ; Thu, 16 Jul 2009 13:33:48 -0400 (EDT) Date: Thu, 16 Jul 2009 19:32:49 +0200 From: Johannes Weiner Subject: Re: [PATCH 1/3] Rename pgmoved variable in shrink_active_list() Message-ID: <20090716173249.GB2267@cmpxchg.org> References: <20090716094619.9D07.A69D9226@jp.fujitsu.com> <20090716095119.9D0A.A69D9226@jp.fujitsu.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090716095119.9D0A.A69D9226@jp.fujitsu.com> Sender: owner-linux-mm@kvack.org To: KOSAKI Motohiro Cc: LKML , linux-mm , Andrew Morton , Wu Fengguang , Rik van Riel , Minchan Kim , Christoph Lameter List-ID: On Thu, Jul 16, 2009 at 09:52:34AM +0900, KOSAKI Motohiro wrote: > Subject: [PATCH] Rename pgmoved variable in shrink_active_list() > > Currently, pgmoved variable have two meanings. it cause harder reviewing a bit. > This patch separate it. > > > Signed-off-by: KOSAKI Motohiro Reviewed-by: Johannes Weiner Below are just minor suggestions regarding the changed code. > --- > mm/vmscan.c | 16 ++++++++-------- > 1 file changed, 8 insertions(+), 8 deletions(-) > > Index: b/mm/vmscan.c > =================================================================== > --- a/mm/vmscan.c > +++ b/mm/vmscan.c > @@ -1239,7 +1239,7 @@ static void move_active_pages_to_lru(str > static void shrink_active_list(unsigned long nr_pages, struct zone *zone, > struct scan_control *sc, int priority, int file) > { > - unsigned long pgmoved; > + unsigned long nr_taken; > unsigned long pgscanned; > unsigned long vm_flags; > LIST_HEAD(l_hold); /* The pages which were snipped off */ > @@ -1247,10 +1247,11 @@ static void shrink_active_list(unsigned > LIST_HEAD(l_inactive); > struct page *page; > struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(zone, sc); > + unsigned long nr_rotated = 0; > > lru_add_drain(); > spin_lock_irq(&zone->lru_lock); > - pgmoved = sc->isolate_pages(nr_pages, &l_hold, &pgscanned, sc->order, > + nr_taken = sc->isolate_pages(nr_pages, &l_hold, &pgscanned, sc->order, > ISOLATE_ACTIVE, zone, > sc->mem_cgroup, 1, file); > /* > @@ -1260,16 +1261,15 @@ static void shrink_active_list(unsigned > if (scanning_global_lru(sc)) { > zone->pages_scanned += pgscanned; > } > - reclaim_stat->recent_scanned[!!file] += pgmoved; > + reclaim_stat->recent_scanned[!!file] += nr_taken; Hm, file is a boolean already, the double negation can probably be dropped. > __count_zone_vm_events(PGREFILL, zone, pgscanned); > if (file) > - __mod_zone_page_state(zone, NR_ACTIVE_FILE, -pgmoved); > + __mod_zone_page_state(zone, NR_ACTIVE_FILE, -nr_taken); > else > - __mod_zone_page_state(zone, NR_ACTIVE_ANON, -pgmoved); > + __mod_zone_page_state(zone, NR_ACTIVE_ANON, -nr_taken); Should perhaps be in another patch, but we could use __mod_zone_page_state(zone, LRU_ACTIVE + file * LRU_FILE); like in the call to move_active_pages_to_lru(). > spin_unlock_irq(&zone->lru_lock); > > - pgmoved = 0; /* count referenced (mapping) mapped pages */ > while (!list_empty(&l_hold)) { > cond_resched(); > page = lru_to_page(&l_hold); > @@ -1283,7 +1283,7 @@ static void shrink_active_list(unsigned > /* page_referenced clears PageReferenced */ > if (page_mapping_inuse(page) && > page_referenced(page, 0, sc->mem_cgroup, &vm_flags)) { > - pgmoved++; > + nr_rotated++; > /* > * Identify referenced, file-backed active pages and > * give them one more trip around the active list. So > @@ -1312,7 +1312,7 @@ static void shrink_active_list(unsigned > * helps balance scan pressure between file and anonymous pages in > * get_scan_ratio. > */ > - reclaim_stat->recent_rotated[!!file] += pgmoved; > + reclaim_stat->recent_rotated[!!file] += nr_rotated; file is boolean. There is one more double negation in isolate_pages_global() that can be dropped as well. If you agree, I can submit all those changes in separate patches. Hannes -- 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