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[209.132.183.28]) by mx.google.com with ESMTPS id h28si5452158qkl.149.2019.06.24.10.43.36 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 24 Jun 2019 10:43:36 -0700 (PDT) Received-SPF: pass (google.com: domain of longman@redhat.com designates 209.132.183.28 as permitted sender) client-ip=209.132.183.28; Authentication-Results: mx.google.com; spf=pass (google.com: domain of longman@redhat.com designates 209.132.183.28 as permitted sender) smtp.mailfrom=longman@redhat.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id DB640C058CBD; Mon, 24 Jun 2019 17:43:17 +0000 (UTC) Received: from llong.com (dhcp-17-85.bos.redhat.com [10.18.17.85]) by smtp.corp.redhat.com (Postfix) with ESMTP id 13DF95D9D3; Mon, 24 Jun 2019 17:43:14 +0000 (UTC) From: Waiman Long To: Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Andrew Morton , Alexander Viro , Jonathan Corbet , Luis Chamberlain , Kees Cook , Johannes Weiner , Michal Hocko , Vladimir Davydov Cc: linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, Roman Gushchin , Shakeel Butt , Andrea Arcangeli , Waiman Long Subject: [PATCH 1/2] mm, memcontrol: Add memcg_iterate_all() Date: Mon, 24 Jun 2019 13:42:18 -0400 Message-Id: <20190624174219.25513-2-longman@redhat.com> In-Reply-To: <20190624174219.25513-1-longman@redhat.com> References: <20190624174219.25513-1-longman@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.32]); Mon, 24 Jun 2019 17:43:35 +0000 (UTC) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: X-Virus-Scanned: ClamAV using ClamSMTP Add a memcg_iterate_all() function for iterating all the available memory cgroups and call the given callback function for each of the memory cgruops. Signed-off-by: Waiman Long --- include/linux/memcontrol.h | 3 +++ mm/memcontrol.c | 13 +++++++++++++ 2 files changed, 16 insertions(+) diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index 1dcb763bb610..0e31418e5a47 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -1268,6 +1268,9 @@ static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg) struct kmem_cache *memcg_kmem_get_cache(struct kmem_cache *cachep); void memcg_kmem_put_cache(struct kmem_cache *cachep); +extern void memcg_iterate_all(void (*callback)(struct mem_cgroup *memcg, + void *arg), void *arg); + #ifdef CONFIG_MEMCG_KMEM int __memcg_kmem_charge(struct page *page, gfp_t gfp, int order); void __memcg_kmem_uncharge(struct page *page, int order); diff --git a/mm/memcontrol.c b/mm/memcontrol.c index ba9138a4a1de..c1c4706f7696 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -443,6 +443,19 @@ static int memcg_alloc_shrinker_maps(struct mem_cgroup *memcg) static void memcg_free_shrinker_maps(struct mem_cgroup *memcg) { } #endif /* CONFIG_MEMCG_KMEM */ +/* + * Iterate all the memory cgroups and call the given callback function + * for each of the memory cgroups. + */ +void memcg_iterate_all(void (*callback)(struct mem_cgroup *memcg, void *arg), + void *arg) +{ + struct mem_cgroup *memcg; + + for_each_mem_cgroup(memcg) + callback(memcg, arg); +} + /** * mem_cgroup_css_from_page - css of the memcg associated with a page * @page: page of interest