From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-f42.google.com (mail-wm0-f42.google.com [74.125.82.42]) by kanga.kvack.org (Postfix) with ESMTP id 701426B0257 for ; Tue, 8 Dec 2015 13:34:48 -0500 (EST) Received: by wmec201 with SMTP id c201so41418914wme.1 for ; Tue, 08 Dec 2015 10:34:48 -0800 (PST) Received: from gum.cmpxchg.org (gum.cmpxchg.org. [85.214.110.215]) by mx.google.com with ESMTPS id m197si6605262wmd.63.2015.12.08.10.34.47 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 08 Dec 2015 10:34:47 -0800 (PST) From: Johannes Weiner Subject: [PATCH 2/8] mm: memcontrol: remove double kmem page_counter init Date: Tue, 8 Dec 2015 13:34:19 -0500 Message-Id: <1449599665-18047-3-git-send-email-hannes@cmpxchg.org> In-Reply-To: <1449599665-18047-1-git-send-email-hannes@cmpxchg.org> References: <1449599665-18047-1-git-send-email-hannes@cmpxchg.org> Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton Cc: Michal Hocko , Vladimir Davydov , linux-mm@kvack.org, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-team@fb.com The kmem page_counter's limit is initialized to PAGE_COUNTER_MAX inside mem_cgroup_css_online(). There is no need to repeat this from memcg_propagate_kmem(). Signed-off-by: Johannes Weiner --- mm/memcontrol.c | 24 ++++++++++-------------- 1 file changed, 10 insertions(+), 14 deletions(-) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index eda8d43..02167db 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -2840,8 +2840,7 @@ static u64 mem_cgroup_read_u64(struct cgroup_subsys_state *css, } #ifdef CONFIG_MEMCG_KMEM -static int memcg_activate_kmem(struct mem_cgroup *memcg, - unsigned long nr_pages) +static int memcg_activate_kmem(struct mem_cgroup *memcg) { int err = 0; int memcg_id; @@ -2876,13 +2875,6 @@ static int memcg_activate_kmem(struct mem_cgroup *memcg, goto out; } - /* - * We couldn't have accounted to this cgroup, because it hasn't got - * activated yet, so this should succeed. - */ - err = page_counter_limit(&memcg->kmem, nr_pages); - VM_BUG_ON(err); - static_branch_inc(&memcg_kmem_enabled_key); /* * A memory cgroup is considered kmem-active as soon as it gets @@ -2903,10 +2895,14 @@ static int memcg_update_kmem_limit(struct mem_cgroup *memcg, int ret; mutex_lock(&memcg_limit_mutex); - if (!memcg_kmem_is_active(memcg)) - ret = memcg_activate_kmem(memcg, limit); - else - ret = page_counter_limit(&memcg->kmem, limit); + /* Top-level cgroup doesn't propagate from root */ + if (!memcg_kmem_is_active(memcg)) { + ret = memcg_activate_kmem(memcg); + if (ret) + goto out; + } + ret = page_counter_limit(&memcg->kmem, limit); +out: mutex_unlock(&memcg_limit_mutex); return ret; } @@ -2925,7 +2921,7 @@ static int memcg_propagate_kmem(struct mem_cgroup *memcg) * after this point, because it has at least one child already. */ if (memcg_kmem_is_active(parent)) - ret = memcg_activate_kmem(memcg, PAGE_COUNTER_MAX); + ret = memcg_activate_kmem(memcg); mutex_unlock(&memcg_limit_mutex); return ret; } -- 2.6.3 -- 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