From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752470AbcGONJe (ORCPT ); Fri, 15 Jul 2016 09:09:34 -0400 Received: from outbound-smtp02.blacknight.com ([81.17.249.8]:50637 "EHLO outbound-smtp02.blacknight.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751161AbcGONJ2 (ORCPT ); Fri, 15 Jul 2016 09:09:28 -0400 From: Mel Gorman To: Andrew Morton Cc: Johannes Weiner , Minchan Kim , Vlastimil Babka , Linux-MM , LKML , Mel Gorman Subject: [PATCH 3/5] mm, pagevec: Release/reacquire lru_lock on pgdat change Date: Fri, 15 Jul 2016 14:09:23 +0100 Message-Id: <1468588165-12461-4-git-send-email-mgorman@techsingularity.net> X-Mailer: git-send-email 2.6.4 In-Reply-To: <1468588165-12461-1-git-send-email-mgorman@techsingularity.net> References: <1468588165-12461-1-git-send-email-mgorman@techsingularity.net> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org With node-lru, the locking is based on the pgdat. Previously it was required that a pagevec drain released one zone lru_lock and acquired another zone lru_lock on every zone change. Now, it's only necessary if the node changes. The end-result is fewer lock release/acquires if the pages are all on the same node but in different zones. Signed-off-by: Mel Gorman --- mm/swap.c | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) diff --git a/mm/swap.c b/mm/swap.c index 77af473635fe..75c63bb2a1da 100644 --- a/mm/swap.c +++ b/mm/swap.c @@ -179,26 +179,26 @@ static void pagevec_lru_move_fn(struct pagevec *pvec, void *arg) { int i; - struct zone *zone = NULL; + struct pglist_data *pgdat = NULL; struct lruvec *lruvec; unsigned long flags = 0; for (i = 0; i < pagevec_count(pvec); i++) { struct page *page = pvec->pages[i]; - struct zone *pagezone = page_zone(page); + struct pglist_data *pagepgdat = page_pgdat(page); - if (pagezone != zone) { - if (zone) - spin_unlock_irqrestore(zone_lru_lock(zone), flags); - zone = pagezone; - spin_lock_irqsave(zone_lru_lock(zone), flags); + if (pagepgdat != pgdat) { + if (pgdat) + spin_unlock_irqrestore(&pgdat->lru_lock, flags); + pgdat = pagepgdat; + spin_lock_irqsave(&pgdat->lru_lock, flags); } - lruvec = mem_cgroup_page_lruvec(page, zone->zone_pgdat); + lruvec = mem_cgroup_page_lruvec(page, pgdat); (*move_fn)(page, lruvec, arg); } - if (zone) - spin_unlock_irqrestore(zone_lru_lock(zone), flags); + if (pgdat) + spin_unlock_irqrestore(&pgdat->lru_lock, flags); release_pages(pvec->pages, pvec->nr, pvec->cold); pagevec_reinit(pvec); } -- 2.6.4