From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756211Ab2BWNxR (ORCPT ); Thu, 23 Feb 2012 08:53:17 -0500 Received: from mail-bk0-f46.google.com ([209.85.214.46]:39147 "EHLO mail-bk0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756182Ab2BWNxO (ORCPT ); Thu, 23 Feb 2012 08:53:14 -0500 Authentication-Results: mr.google.com; spf=pass (google.com: domain of koct9i@gmail.com designates 10.205.123.2 as permitted sender) smtp.mail=koct9i@gmail.com; dkim=pass header.i=koct9i@gmail.com Subject: [PATCH v3 17/21] mm: handle lruvec relock in memory controller To: Hugh Dickins , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Johannes Weiner , Andrew Morton , KAMEZAWA Hiroyuki From: Konstantin Khlebnikov Cc: Andi Kleen Date: Thu, 23 Feb 2012 17:53:10 +0400 Message-ID: <20120223135310.12988.46867.stgit@zurg> In-Reply-To: <20120223133728.12988.5432.stgit@zurg> References: <20120223133728.12988.5432.stgit@zurg> User-Agent: StGit/0.15 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Carefully relock lruvec lru lock at page memory cgroup change. * In free_pn_rcu() wait for lruvec lock release. Locking primitives keep lruvec pointer after successful lock held. Signed-off-by: Konstantin Khlebnikov --- mm/memcontrol.c | 19 +++++++++++++------ 1 files changed, 13 insertions(+), 6 deletions(-) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index aed1360..230f434 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -2542,7 +2542,6 @@ __mem_cgroup_commit_charge_lrucare(struct page *page, struct mem_cgroup *memcg, enum charge_type ctype) { struct page_cgroup *pc = lookup_page_cgroup(page); - struct zone *zone = page_zone(page); struct lruvec *lruvec; unsigned long flags; bool removed = false; @@ -2552,20 +2551,19 @@ __mem_cgroup_commit_charge_lrucare(struct page *page, struct mem_cgroup *memcg, * is already on LRU. It means the page may on some other page_cgroup's * LRU. Take care of it. */ - spin_lock_irqsave(&zone->lru_lock, flags); + lruvec = lock_page_lruvec(page, &flags); if (PageLRU(page)) { - lruvec = page_lruvec(page); del_page_from_lru_list(lruvec, page, page_lru(page)); ClearPageLRU(page); removed = true; } __mem_cgroup_commit_charge(memcg, page, 1, pc, ctype); if (removed) { - lruvec = page_lruvec(page); + lruvec = __relock_page_lruvec(lruvec, page); add_page_to_lru_list(lruvec, page, page_lru(page)); SetPageLRU(page); } - spin_unlock_irqrestore(&zone->lru_lock, flags); + unlock_lruvec(lruvec, &flags); } int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm, @@ -4624,7 +4622,16 @@ static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *memcg, int node) static void free_mem_cgroup_per_zone_info(struct mem_cgroup *memcg, int node) { - kfree(memcg->info.nodeinfo[node]); + struct mem_cgroup_per_node *pn = memcg->info.nodeinfo[node]; + int zone; + + if (!pn) + return; + + for (zone = 0; zone < MAX_NR_ZONES; zone++) + wait_lruvec_unlock(&pn->zoneinfo[zone].lruvec); + + kfree(pn); } static struct mem_cgroup *mem_cgroup_alloc(void)