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Thu, 04 Feb 2021 13:15:25 +0300 Subject: Re: [v6 PATCH 10/11] mm: memcontrol: reparent nr_deferred when memcg offline To: Yang Shi , guro@fb.com, vbabka@suse.cz, shakeelb@google.com, david@fromorbit.com, hannes@cmpxchg.org, mhocko@suse.com, akpm@linux-foundation.org Cc: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org References: <20210203172042.800474-1-shy828301@gmail.com> <20210203172042.800474-11-shy828301@gmail.com> From: Kirill Tkhai Message-ID: <05b2ce17-9fd3-5702-8eeb-bcbb671d8716@virtuozzo.com> Date: Thu, 4 Feb 2021 13:15:24 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.6.1 MIME-Version: 1.0 In-Reply-To: <20210203172042.800474-11-shy828301@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 8249D12E X-Stat-Signature: ta5eyp7kkdyhuk6fn6odz6dfitkm9ykz Received-SPF: none (virtuozzo.com>: No applicable sender policy available) receiver=imf04; identity=mailfrom; envelope-from=""; helo=relay.sw.ru; client-ip=185.231.240.75 X-HE-DKIM-Result: none/none X-HE-Tag: 1612433764-208026 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: On 03.02.2021 20:20, Yang Shi wrote: > Now shrinker's nr_deferred is per memcg for memcg aware shrinkers, add to parent's > corresponding nr_deferred when memcg offline. > > Acked-by: Vlastimil Babka > Signed-off-by: Yang Shi Acked-by: Kirill Tkhai > --- > include/linux/memcontrol.h | 1 + > mm/memcontrol.c | 1 + > mm/vmscan.c | 24 ++++++++++++++++++++++++ > 3 files changed, 26 insertions(+) > > diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h > index c457fc7bc631..e1c4b93889ad 100644 > --- a/include/linux/memcontrol.h > +++ b/include/linux/memcontrol.h > @@ -1585,6 +1585,7 @@ static inline bool mem_cgroup_under_socket_pressure(struct mem_cgroup *memcg) > int alloc_shrinker_info(struct mem_cgroup *memcg); > void free_shrinker_info(struct mem_cgroup *memcg); > void set_shrinker_bit(struct mem_cgroup *memcg, int nid, int shrinker_id); > +void reparent_shrinker_deferred(struct mem_cgroup *memcg); > #else > #define mem_cgroup_sockets_enabled 0 > static inline void mem_cgroup_sk_alloc(struct sock *sk) { }; > diff --git a/mm/memcontrol.c b/mm/memcontrol.c > index f64ad0d044d9..21f36b73f36a 100644 > --- a/mm/memcontrol.c > +++ b/mm/memcontrol.c > @@ -5282,6 +5282,7 @@ static void mem_cgroup_css_offline(struct cgroup_subsys_state *css) > page_counter_set_low(&memcg->memory, 0); > > memcg_offline_kmem(memcg); > + reparent_shrinker_deferred(memcg); > wb_memcg_offline(memcg); > > drain_all_stock(memcg); > diff --git a/mm/vmscan.c b/mm/vmscan.c > index 20a35d26ae12..574d920c4cab 100644 > --- a/mm/vmscan.c > +++ b/mm/vmscan.c > @@ -386,6 +386,30 @@ static long set_nr_deferred_memcg(long nr, int nid, struct shrinker *shrinker, > return atomic_long_add_return(nr, &info->nr_deferred[shrinker->id]); > } > > +void reparent_shrinker_deferred(struct mem_cgroup *memcg) > +{ > + int i, nid; > + long nr; > + struct mem_cgroup *parent; > + struct shrinker_info *child_info, *parent_info; > + > + parent = parent_mem_cgroup(memcg); > + if (!parent) > + parent = root_mem_cgroup; > + > + /* Prevent from concurrent shrinker_info expand */ > + down_read(&shrinker_rwsem); > + for_each_node(nid) { > + child_info = shrinker_info_protected(memcg, nid); > + parent_info = shrinker_info_protected(parent, nid); > + for (i = 0; i < shrinker_nr_max; i++) { > + nr = atomic_long_read(&child_info->nr_deferred[i]); > + atomic_long_add(nr, &parent_info->nr_deferred[i]); > + } > + } > + up_read(&shrinker_rwsem); > +} > + > static bool cgroup_reclaim(struct scan_control *sc) > { > return sc->target_mem_cgroup; >