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Tue, 10 Nov 2020 10:46:19 -0800 Received: from intmgw004.06.prn3.facebook.com (2620:10d:c085:108::8) by mail.thefacebook.com (2620:10d:c085:21d::6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1979.3; Tue, 10 Nov 2020 10:46:18 -0800 Received: by devvm1755.vll0.facebook.com (Postfix, from userid 111017) id 60001238474C; Tue, 10 Nov 2020 10:46:16 -0800 (PST) From: Roman Gushchin To: Andrew Morton , CC: Shakeel Butt , Johannes Weiner , Michal Hocko , , , Roman Gushchin Subject: [PATCH] mm: memcg: fix obsolete code comments Date: Tue, 10 Nov 2020 10:46:15 -0800 Message-ID: <20201110184615.311974-1-guro@fb.com> X-Mailer: git-send-email 2.24.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-FB-Internal: Safe Content-Type: text/plain X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.312,18.0.737 definitions=2020-11-10_07:2020-11-10,2020-11-10 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 mlxscore=0 spamscore=0 mlxlogscore=701 phishscore=0 adultscore=0 suspectscore=2 priorityscore=1501 bulkscore=0 impostorscore=0 lowpriorityscore=0 clxscore=1015 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2011100129 X-FB-Internal: deliver 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: This patch fixes/removes some obsolete comments in the code related to the kernel memory accounting: - kmem_cache->memcg_params.memcg_caches has been removed by commit 9855609bde03 ("mm: memcg/slab: use a single set of kmem_caches for all accounted allocations") - memcg->kmemcg_id is not used as a gate for kmem accounting since commit 0b8f73e10428 ("mm: memcontrol: clean up alloc, online, offline, free functions") Signed-off-by: Roman Gushchin --- include/linux/memcontrol.h | 6 ++---- mm/memcontrol.c | 6 ------ 2 files changed, 2 insertions(+), 10 deletions(-) diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index 20108e426f84..01099dfa839c 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -310,7 +310,6 @@ struct mem_cgroup { int tcpmem_pressure; =20 #ifdef CONFIG_MEMCG_KMEM - /* Index in the kmem_cache->memcg_params.memcg_caches array */ int kmemcg_id; enum memcg_kmem_state kmem_state; struct obj_cgroup __rcu *objcg; @@ -1641,9 +1640,8 @@ static inline void memcg_kmem_uncharge_page(struct = page *page, int order) } =20 /* - * helper for accessing a memcg's index. It will be used as an index in = the - * child cache array in kmem_cache, and also to derive its name. This fu= nction - * will return -1 when this is not a kmem-limited memcg. + * A helper for accessing memcg's kmem_id, used for getting + * corresponding LRU lists. */ static inline int memcg_cache_id(struct mem_cgroup *memcg) { diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 69a2893a6455..62bbd48d8445 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -3680,12 +3680,6 @@ static int memcg_online_kmem(struct mem_cgroup *me= mcg) =20 static_branch_enable(&memcg_kmem_enabled_key); =20 - /* - * A memory cgroup is considered kmem-online as soon as it gets - * kmemcg_id. Setting the id after enabling static branching will - * guarantee no one starts accounting before all call sites are - * patched. - */ memcg->kmemcg_id =3D memcg_id; memcg->kmem_state =3D KMEM_ONLINE; =20 --=20 2.26.2