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Mon, 08 Mar 2021 14:37:38 -0800 (PST) Received: from f8ffc2228008.ant.amazon.com ([54.240.193.1]) by smtp.gmail.com with ESMTPSA id p5sm9350647pfq.56.2021.03.08.14.37.31 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 08 Mar 2021 14:37:37 -0800 (PST) Subject: Re: [PATCH v2 1/2] mm/memcg: rename mem_cgroup_split_huge_fixup to split_page_memcg To: Zhou Guanghui , linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: akpm@linux-foundation.org, mhocko@suse.com, hannes@cmpxchg.org, hughd@google.com, kirill.shutemov@linux.intel.com, npiggin@gmail.com, ziy@nvidia.com, wangkefeng.wang@huawei.com, guohanjun@huawei.com, dingtianhong@huawei.com, chenweilong@huawei.com, rui.xiang@huawei.com References: <20210304074053.65527-1-zhouguanghui1@huawei.com> <20210304074053.65527-2-zhouguanghui1@huawei.com> From: "Singh, Balbir" Message-ID: <3ad50842-881f-eb88-a14d-0b6c70ce33d2@gmail.com> Date: Tue, 9 Mar 2021 09:37:29 +1100 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.8.0 MIME-Version: 1.0 In-Reply-To: <20210304074053.65527-2-zhouguanghui1@huawei.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-GB Content-Transfer-Encoding: 7bit X-Stat-Signature: yidsd45z98n5hpubxd8f1x47kzqnqzjn X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 55B91A0009E5 Received-SPF: none (gmail.com>: No applicable sender policy available) receiver=imf24; identity=mailfrom; envelope-from=""; helo=mail-pl1-f169.google.com; client-ip=209.85.214.169 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1615243056-425697 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 4/3/21 6:40 pm, Zhou Guanghui wrote: > Rename mem_cgroup_split_huge_fixup to split_page_memcg and explicitly > pass in page number argument. > > In this way, the interface name is more common and can be used by > potential users. In addition, the complete info(memcg and flag) of > the memcg needs to be set to the tail pages. > > Signed-off-by: Zhou Guanghui > --- > include/linux/memcontrol.h | 6 ++---- > mm/huge_memory.c | 2 +- > mm/memcontrol.c | 15 ++++++--------- > 3 files changed, 9 insertions(+), 14 deletions(-) > > diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h > index e6dc793d587d..0c04d39a7967 100644 > --- a/include/linux/memcontrol.h > +++ b/include/linux/memcontrol.h > @@ -1061,9 +1061,7 @@ static inline void memcg_memory_event_mm(struct mm_struct *mm, > rcu_read_unlock(); > } > > -#ifdef CONFIG_TRANSPARENT_HUGEPAGE > -void mem_cgroup_split_huge_fixup(struct page *head); > -#endif > +void split_page_memcg(struct page *head, unsigned int nr); > > #else /* CONFIG_MEMCG */ > > @@ -1400,7 +1398,7 @@ unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order, > return 0; > } > > -static inline void mem_cgroup_split_huge_fixup(struct page *head) > +static inline void split_page_memcg(struct page *head, unsigned int nr) > { > } > > diff --git a/mm/huge_memory.c b/mm/huge_memory.c > index 395c75111d33..e7f29308ebc8 100644 > --- a/mm/huge_memory.c > +++ b/mm/huge_memory.c > @@ -2471,7 +2471,7 @@ static void __split_huge_page(struct page *page, struct list_head *list, > int i; > > /* complete memcg works before add pages to LRU */ > - mem_cgroup_split_huge_fixup(head); > + split_page_memcg(head, nr); > > if (PageAnon(head) && PageSwapCache(head)) { > swp_entry_t entry = { .val = page_private(head) }; > diff --git a/mm/memcontrol.c b/mm/memcontrol.c > index 845eec01ef9d..e064ac0d850a 100644 > --- a/mm/memcontrol.c > +++ b/mm/memcontrol.c > @@ -3287,24 +3287,21 @@ void obj_cgroup_uncharge(struct obj_cgroup *objcg, size_t size) > > #endif /* CONFIG_MEMCG_KMEM */ > > -#ifdef CONFIG_TRANSPARENT_HUGEPAGE > /* > - * Because page_memcg(head) is not set on compound tails, set it now. > + * Because page_memcg(head) is not set on tails, set it now. > */ > -void mem_cgroup_split_huge_fixup(struct page *head) > +void split_page_memcg(struct page *head, unsigned int nr) > { Do we need input validation on nr? Can nr be aribtrary or can we enforce VM_BUG_ON(!is_power_of_2(nr)); Balbir Singh