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Wed, 2 Jun 2021 18:09:37 -0700 Received: by devvm3388.prn0.facebook.com (Postfix, from userid 111017) id CE6497F1B349; Wed, 2 Jun 2021 18:09:32 -0700 (PDT) From: Roman Gushchin To: Dennis Zhou CC: Tejun Heo , Christoph Lameter , Andrew Morton , Vlastimil Babka , , , Roman Gushchin Subject: [PATCH v2 2/3] mm, memcg: introduce mem_cgroup_kmem_disabled() Date: Wed, 2 Jun 2021 18:09:30 -0700 Message-ID: <20210603010931.1472512-3-guro@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210603010931.1472512-1-guro@fb.com> References: <20210603010931.1472512-1-guro@fb.com> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-ORIG-GUID: j9cpsD7GfJk4n2VxMW8HEDE3hAZ47ibu X-Proofpoint-GUID: j9cpsD7GfJk4n2VxMW8HEDE3hAZ47ibu X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.761 definitions=2021-06-02_11:2021-06-02,2021-06-02 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 mlxscore=0 mlxlogscore=805 malwarescore=0 adultscore=0 phishscore=0 priorityscore=1501 suspectscore=0 clxscore=1015 spamscore=0 bulkscore=0 impostorscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2106030006 X-FB-Internal: deliver Authentication-Results: imf23.hostedemail.com; dkim=pass header.d=fb.com header.s=facebook header.b=Q1KIJsAo; spf=pass (imf23.hostedemail.com: domain of "prvs=578884e26b=guro@fb.com" designates 67.231.153.30 as permitted sender) smtp.mailfrom="prvs=578884e26b=guro@fb.com"; dmarc=pass (policy=reject) header.from=fb.com X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 21DF9A000248 X-Stat-Signature: j3bx5996t61jagu79bido4qwu1i7qn1h X-HE-Tag: 1622682567-67142 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: Introduce a new mem_cgroup_kmem_disabled() helper, similar to mem_cgroup_disabled(), to check whether the kernel memory accounting is off. A user could disable it using a boot option to eliminate some associated costs. The helper can be used outside of memcontrol.c to dynamically disable the kmem-related code. The returned value is stable after the kernel initialization is finished. Signed-off-by: Roman Gushchin --- include/linux/memcontrol.h | 5 +++++ mm/memcontrol.c | 5 +++++ 2 files changed, 10 insertions(+) diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index 0c04d39a7967..8ef51c58f470 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -1583,6 +1583,7 @@ static inline void memcg_set_shrinker_bit(struct mem_cgroup *memcg, #endif #ifdef CONFIG_MEMCG_KMEM +bool mem_cgroup_kmem_disabled(void); int __memcg_kmem_charge_page(struct page *page, gfp_t gfp, int order); void __memcg_kmem_uncharge_page(struct page *page, int order); @@ -1636,6 +1637,10 @@ static inline int memcg_cache_id(struct mem_cgroup *memcg) struct mem_cgroup *mem_cgroup_from_obj(void *p); #else +static inline bool mem_cgroup_kmem_disabled(void) +{ + return true; +} static inline int memcg_kmem_charge_page(struct page *page, gfp_t gfp, int order) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index e6203ee24a11..1fa9b00ec71d 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -255,6 +255,11 @@ struct cgroup_subsys_state *vmpressure_to_css(struct vmpressure *vmpr) #ifdef CONFIG_MEMCG_KMEM extern spinlock_t css_set_lock; +bool mem_cgroup_kmem_disabled(void) +{ + return cgroup_memory_nokmem; +} + static int __memcg_kmem_charge(struct mem_cgroup *memcg, gfp_t gfp, unsigned int nr_pages); static void __memcg_kmem_uncharge(struct mem_cgroup *memcg,