Re: [PATCH 2/5] mm, memcg: narrow the scope of percpu_charge_mutex

[PATCH 0/5] Cleanups and fixup for memcontrol · Miaohe Lin <linmiaohe@huawei.com> · 2021-07-29
[PATCH 1/5] mm, memcg: remove unused functions · Miaohe Lin <linmiaohe@huawei.com> · 2021-07-29
Re: [PATCH 1/5] mm, memcg: remove unused functions · Shakeel Butt <hidden> · 2021-07-29
Re: [PATCH 1/5] mm, memcg: remove unused functions · Muchun Song <hidden> · 2021-07-30
Re: [PATCH 1/5] mm, memcg: remove unused functions · Roman Gushchin <hidden> · 2021-07-30
Re: [PATCH 1/5] mm, memcg: remove unused functions · Michal Hocko <mhocko@suse.com> · 2021-07-30
[PATCH 2/5] mm, memcg: narrow the scope of percpu_charge_mutex · Miaohe Lin <linmiaohe@huawei.com> · 2021-07-29
Re: [PATCH 2/5] mm, memcg: narrow the scope of percpu_charge_mutex · Muchun Song <hidden> · 2021-07-30
Re: [PATCH 2/5] mm, memcg: narrow the scope of percpu_charge_mutex · Roman Gushchin <hidden> · 2021-07-30
Re: [PATCH 2/5] mm, memcg: narrow the scope of percpu_charge_mutex · Michal Hocko <mhocko@suse.com> · 2021-07-30
Re: [PATCH 2/5] mm, memcg: narrow the scope of percpu_charge_mutex · Miaohe Lin <linmiaohe@huawei.com> · 2021-07-31
Re: [PATCH 2/5] mm, memcg: narrow the scope of percpu_charge_mutex · Michal Hocko <mhocko@suse.com> · 2021-08-02
Re: [PATCH 2/5] mm, memcg: narrow the scope of percpu_charge_mutex · Miaohe Lin <linmiaohe@huawei.com> · 2021-08-02
Re: [PATCH 2/5] mm, memcg: narrow the scope of percpu_charge_mutex · Roman Gushchin <hidden> · 2021-08-03
Re: [PATCH 2/5] mm, memcg: narrow the scope of percpu_charge_mutex · Miaohe Lin <linmiaohe@huawei.com> · 2021-08-03
Re: [PATCH 2/5] mm, memcg: narrow the scope of percpu_charge_mutex · Michal Hocko <mhocko@suse.com> · 2021-08-03
Re: [PATCH 2/5] mm, memcg: narrow the scope of percpu_charge_mutex · Roman Gushchin <hidden> · 2021-08-03
Re: [PATCH 2/5] mm, memcg: narrow the scope of percpu_charge_mutex · Michal Hocko <mhocko@suse.com> · 2021-08-03
Re: [PATCH 2/5] mm, memcg: narrow the scope of percpu_charge_mutex · Muchun Song <hidden> · 2021-08-03
Re: [PATCH 2/5] mm, memcg: narrow the scope of percpu_charge_mutex · Miaohe Lin <linmiaohe@huawei.com> · 2021-08-03
Re: [PATCH 2/5] mm, memcg: narrow the scope of percpu_charge_mutex · Johannes Weiner <hannes@cmpxchg.org> · 2021-08-03
Re: [PATCH 2/5] mm, memcg: narrow the scope of percpu_charge_mutex · Michal Hocko <mhocko@suse.com> · 2021-08-04
Re: [PATCH 2/5] mm, memcg: narrow the scope of percpu_charge_mutex · Miaohe Lin <linmiaohe@huawei.com> · 2021-08-05
Re: [PATCH 2/5] mm, memcg: narrow the scope of percpu_charge_mutex · Michal Hocko <mhocko@suse.com> · 2021-07-30
[PATCH 3/5] mm, memcg: save some atomic ops when flush is already true · Miaohe Lin <linmiaohe@huawei.com> · 2021-07-29
Re: [PATCH 3/5] mm, memcg: save some atomic ops when flush is already true · Shakeel Butt <hidden> · 2021-07-29
Re: [PATCH 3/5] mm, memcg: save some atomic ops when flush is already true · Muchun Song <hidden> · 2021-07-30
Re: [PATCH 3/5] mm, memcg: save some atomic ops when flush is already true · Roman Gushchin <hidden> · 2021-07-30
Re: [PATCH 3/5] mm, memcg: save some atomic ops when flush is already true · Michal Hocko <mhocko@suse.com> · 2021-07-30
[PATCH 4/5] mm, memcg: avoid possible NULL pointer dereferencing in mem_cgroup_init() · Miaohe Lin <linmiaohe@huawei.com> · 2021-07-29
Re: [PATCH 4/5] mm, memcg: avoid possible NULL pointer dereferencing in mem_cgroup_init() · Matthew Wilcox <willy@infradead.org> · 2021-07-29
Re: [PATCH 4/5] mm, memcg: avoid possible NULL pointer dereferencing in mem_cgroup_init() · Miaohe Lin <linmiaohe@huawei.com> · 2021-07-30
Re: [PATCH 4/5] mm, memcg: avoid possible NULL pointer dereferencing in mem_cgroup_init() · Roman Gushchin <hidden> · 2021-07-30
Re: [PATCH 4/5] mm, memcg: avoid possible NULL pointer dereferencing in mem_cgroup_init() · Miaohe Lin <linmiaohe@huawei.com> · 2021-07-30
Re: [PATCH 4/5] mm, memcg: avoid possible NULL pointer dereferencing in mem_cgroup_init() · Michal Hocko <mhocko@suse.com> · 2021-07-30
Re: [PATCH 4/5] mm, memcg: avoid possible NULL pointer dereferencing in mem_cgroup_init() · Miaohe Lin <linmiaohe@huawei.com> · 2021-07-31
Re: [PATCH 4/5] mm, memcg: avoid possible NULL pointer dereferencing in mem_cgroup_init() · Michal Hocko <mhocko@suse.com> · 2021-08-02
Re: [PATCH 4/5] mm, memcg: avoid possible NULL pointer dereferencing in mem_cgroup_init() · Miaohe Lin <linmiaohe@huawei.com> · 2021-08-02
Re: [PATCH 4/5] mm, memcg: avoid possible NULL pointer dereferencing in mem_cgroup_init() · Michal Hocko <mhocko@suse.com> · 2021-08-02
Re: [PATCH 4/5] mm, memcg: avoid possible NULL pointer dereferencing in mem_cgroup_init() · Miaohe Lin <linmiaohe@huawei.com> · 2021-08-02
[PATCH 5/5] mm, memcg: always call __mod_node_page_state() with preempt disabled · Miaohe Lin <linmiaohe@huawei.com> · 2021-07-29
Re: [PATCH 5/5] mm, memcg: always call __mod_node_page_state() with preempt disabled · Shakeel Butt <hidden> · 2021-07-29
Re: [PATCH 5/5] mm, memcg: always call __mod_node_page_state() with preempt disabled · Miaohe Lin <linmiaohe@huawei.com> · 2021-07-30
Re: [External] Re: [PATCH 5/5] mm, memcg: always call __mod_node_page_state() with preempt disabled · Muchun Song <hidden> · 2021-07-30
Re: [External] Re: [PATCH 5/5] mm, memcg: always call __mod_node_page_state() with preempt disabled · Miaohe Lin <linmiaohe@huawei.com> · 2021-07-30

From: Michal Hocko <mhocko@suse.com>
Date: 2021-08-03 07:28:03
Also in: cgroups, lkml

On Tue 03-08-21 07:13:35, Roman Gushchin wrote:

I’d go with atomic_dec().

which is not implying memory barriers either. You would need
atomic_dec_return or some other explicit barrier IIRC.
-- 
Michal Hocko
SUSE Labs

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