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Date: Sat, 10 Jul 2021 19:08:17 +0800
From: Muchun Song <songmuchun@...edance.com>
To: Suren Baghdasaryan <surenb@...gle.com>
Cc: Tejun Heo <tj@...nel.org>, Johannes Weiner <hannes@...xchg.org>,
Michal Hocko <mhocko@...nel.org>,
Vladimir Davydov <vdavydov.dev@...il.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Shakeel Butt <shakeelb@...gle.com>,
Roman Gushchin <guro@...com>, Yang Shi <shy828301@...il.com>,
Alex Shi <alexs@...nel.org>,
Wei Yang <richard.weiyang@...il.com>,
Vlastimil Babka <vbabka@...e.cz>, Jens Axboe <axboe@...nel.dk>,
Joonsoo Kim <iamjoonsoo.kim@....com>,
David Hildenbrand <david@...hat.com>,
Matthew Wilcox <willy@...radead.org>, apopple@...dia.com,
Minchan Kim <minchan@...nel.org>,
Miaohe Lin <linmiaohe@...wei.com>,
LKML <linux-kernel@...r.kernel.org>,
Cgroups <cgroups@...r.kernel.org>,
Linux Memory Management List <linux-mm@...ck.org>,
kernel-team@...roid.com
Subject: Re: [External] [PATCH v3 2/3] mm, memcg: inline mem_cgroup_{charge/uncharge}
to improve disabled memcg config
On Sat, Jul 10, 2021 at 8:36 AM Suren Baghdasaryan <surenb@...gle.com> wrote:
>
> Inline mem_cgroup_{charge/uncharge} and mem_cgroup_uncharge_list functions
> functions to perform mem_cgroup_disabled static key check inline before
> calling the main body of the function. This minimizes the memcg overhead
> in the pagefault and exit_mmap paths when memcgs are disabled using
> cgroup_disable=memory command-line option.
> This change results in ~0.4% overhead reduction when running PFT test
> comparing {CONFIG_MEMCG=n} against {CONFIG_MEMCG=y, cgroup_disable=memory}
> configurationon on an 8-core ARM64 Android device.
>
> Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
> Reviewed-by: Shakeel Butt <shakeelb@...gle.com>
Reviewed-by: Muchun Song <songmuchun@...edance.com>
But some nits below.
> ---
> include/linux/memcontrol.h | 28 +++++++++++++++++++++++++---
> mm/memcontrol.c | 29 ++++++++++-------------------
> 2 files changed, 35 insertions(+), 22 deletions(-)
>
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index bfe5c486f4ad..39fa88051a42 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -693,13 +693,35 @@ static inline bool mem_cgroup_below_min(struct mem_cgroup *memcg)
> page_counter_read(&memcg->memory);
> }
>
> -int mem_cgroup_charge(struct page *page, struct mm_struct *mm, gfp_t gfp_mask);
> +int __mem_cgroup_charge(struct page *page, struct mm_struct *mm,
> + gfp_t gfp_mask);
> +static inline int mem_cgroup_charge(struct page *page, struct mm_struct *mm,
> + gfp_t gfp_mask)
> +{
> + if (mem_cgroup_disabled())
> + return 0;
> + return __mem_cgroup_charge(page, mm, gfp_mask);
> +}
> +
> int mem_cgroup_swapin_charge_page(struct page *page, struct mm_struct *mm,
> gfp_t gfp, swp_entry_t entry);
> void mem_cgroup_swapin_uncharge_swap(swp_entry_t entry);
>
> -void mem_cgroup_uncharge(struct page *page);
> -void mem_cgroup_uncharge_list(struct list_head *page_list);
> +void __mem_cgroup_uncharge(struct page *page);
> +static inline void mem_cgroup_uncharge(struct page *page)
> +{
> + if (mem_cgroup_disabled())
> + return;
> + __mem_cgroup_uncharge(page);
> +}
> +
> +void __mem_cgroup_uncharge_list(struct list_head *page_list);
> +static inline void mem_cgroup_uncharge_list(struct list_head *page_list)
> +{
> + if (mem_cgroup_disabled())
> + return;
> + __mem_cgroup_uncharge_list(page_list);
> +}
>
> void mem_cgroup_migrate(struct page *oldpage, struct page *newpage);
>
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index a228cd51c4bd..cdaf7003b43d 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -6701,8 +6701,7 @@ void mem_cgroup_calculate_protection(struct mem_cgroup *root,
> atomic_long_read(&parent->memory.children_low_usage)));
> }
>
> -static int __mem_cgroup_charge(struct page *page, struct mem_cgroup *memcg,
> - gfp_t gfp)
> +static int charge_memcg(struct page *page, struct mem_cgroup *memcg, gfp_t gfp)
> {
> unsigned int nr_pages = thp_nr_pages(page);
> int ret;
> @@ -6723,7 +6722,7 @@ static int __mem_cgroup_charge(struct page *page, struct mem_cgroup *memcg,
> }
>
> /**
> - * mem_cgroup_charge - charge a newly allocated page to a cgroup
> + * __mem_cgroup_charge - charge a newly allocated page to a cgroup
> * @page: page to charge
> * @mm: mm context of the victim
> * @gfp_mask: reclaim mode
> @@ -6736,16 +6735,14 @@ static int __mem_cgroup_charge(struct page *page, struct mem_cgroup *memcg,
> *
> * Returns 0 on success. Otherwise, an error code is returned.
> */
> -int mem_cgroup_charge(struct page *page, struct mm_struct *mm, gfp_t gfp_mask)
> +int __mem_cgroup_charge(struct page *page, struct mm_struct *mm,
> + gfp_t gfp_mask)
> {
> struct mem_cgroup *memcg;
> int ret;
>
> - if (mem_cgroup_disabled())
> - return 0;
> -
> memcg = get_mem_cgroup_from_mm(mm);
> - ret = __mem_cgroup_charge(page, memcg, gfp_mask);
> + ret = charge_memcg(page, memcg, gfp_mask);
> css_put(&memcg->css);
>
> return ret;
> @@ -6780,7 +6777,7 @@ int mem_cgroup_swapin_charge_page(struct page *page, struct mm_struct *mm,
> memcg = get_mem_cgroup_from_mm(mm);
> rcu_read_unlock();
>
> - ret = __mem_cgroup_charge(page, memcg, gfp);
> + ret = charge_memcg(page, memcg, gfp);
>
> css_put(&memcg->css);
> return ret;
> @@ -6916,18 +6913,15 @@ static void uncharge_page(struct page *page, struct uncharge_gather *ug)
> }
>
> /**
> - * mem_cgroup_uncharge - uncharge a page
> + * __mem_cgroup_uncharge - uncharge a page
> * @page: page to uncharge
> *
> * Uncharge a page previously charged with mem_cgroup_charge().
The comment here also needs to be updated.
mem_cgroup_uncharge() -> __mem_cgroup_uncharge()
> */
> -void mem_cgroup_uncharge(struct page *page)
> +void __mem_cgroup_uncharge(struct page *page)
> {
> struct uncharge_gather ug;
>
> - if (mem_cgroup_disabled())
> - return;
> -
> /* Don't touch page->lru of any random page, pre-check: */
> if (!page_memcg(page))
> return;
> @@ -6938,20 +6932,17 @@ void mem_cgroup_uncharge(struct page *page)
> }
>
> /**
> - * mem_cgroup_uncharge_list - uncharge a list of page
> + * __mem_cgroup_uncharge_list - uncharge a list of page
> * @page_list: list of pages to uncharge
> *
> * Uncharge a list of pages previously charged with
> * mem_cgroup_charge().
Should be __mem_cgroup_charge().
Thanks.
> */
> -void mem_cgroup_uncharge_list(struct list_head *page_list)
> +void __mem_cgroup_uncharge_list(struct list_head *page_list)
> {
> struct uncharge_gather ug;
> struct page *page;
>
> - if (mem_cgroup_disabled())
> - return;
> -
> uncharge_gather_clear(&ug);
> list_for_each_entry(page, page_list, lru)
> uncharge_page(page, &ug);
> --
> 2.32.0.93.g670b81a890-goog
>
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