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Date: Tue, 25 Jun 2024 09:09:45 +0200
From: Michal Hocko <mhocko@...e.com>
To: Roman Gushchin <roman.gushchin@...ux.dev>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Johannes Weiner <hannes@...xchg.org>,
Shakeel Butt <shakeel.butt@...ux.dev>,
Muchun Song <muchun.song@...ux.dev>, linux-kernel@...r.kernel.org,
cgroups@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v2 12/14] mm: memcg: group cgroup v1 memcg related
declarations
On Mon 24-06-24 17:59:04, Roman Gushchin wrote:
> Group all cgroup v1-related declarations at the end of memcontrol.h
> and mm/memcontrol-v1.h with an intention to put them all together
> under a config option later on. It should make things easier to
> follow and maintain too.
>
> Signed-off-by: Roman Gushchin <roman.gushchin@...ux.dev>
Acked-by: Michal Hocko <mhocko@...e.com>
> ---
> include/linux/memcontrol.h | 144 +++++++++++++++++++------------------
> mm/memcontrol-v1.h | 89 ++++++++++++-----------
> 2 files changed, 123 insertions(+), 110 deletions(-)
>
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index 588179d29849..a70d64ed04f5 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -950,39 +950,13 @@ static inline void mem_cgroup_exit_user_fault(void)
> current->in_user_fault = 0;
> }
>
> -static inline bool task_in_memcg_oom(struct task_struct *p)
> -{
> - return p->memcg_in_oom;
> -}
> -
> -bool mem_cgroup_oom_synchronize(bool wait);
> struct mem_cgroup *mem_cgroup_get_oom_group(struct task_struct *victim,
> struct mem_cgroup *oom_domain);
> void mem_cgroup_print_oom_group(struct mem_cgroup *memcg);
>
> -void folio_memcg_lock(struct folio *folio);
> -void folio_memcg_unlock(struct folio *folio);
> -
> void __mod_memcg_state(struct mem_cgroup *memcg, enum memcg_stat_item idx,
> int val);
>
> -/* try to stablize folio_memcg() for all the pages in a memcg */
> -static inline bool mem_cgroup_trylock_pages(struct mem_cgroup *memcg)
> -{
> - rcu_read_lock();
> -
> - if (mem_cgroup_disabled() || !atomic_read(&memcg->moving_account))
> - return true;
> -
> - rcu_read_unlock();
> - return false;
> -}
> -
> -static inline void mem_cgroup_unlock_pages(void)
> -{
> - rcu_read_unlock();
> -}
> -
> /* idx can be of type enum memcg_stat_item or node_stat_item */
> static inline void mod_memcg_state(struct mem_cgroup *memcg,
> enum memcg_stat_item idx, int val)
> @@ -1109,10 +1083,6 @@ static inline void memcg_memory_event_mm(struct mm_struct *mm,
>
> void split_page_memcg(struct page *head, int old_order, int new_order);
>
> -unsigned long memcg1_soft_limit_reclaim(pg_data_t *pgdat, int order,
> - gfp_t gfp_mask,
> - unsigned long *total_scanned);
> -
> #else /* CONFIG_MEMCG */
>
> #define MEM_CGROUP_ID_SHIFT 0
> @@ -1423,26 +1393,6 @@ mem_cgroup_print_oom_meminfo(struct mem_cgroup *memcg)
> {
> }
>
> -static inline void folio_memcg_lock(struct folio *folio)
> -{
> -}
> -
> -static inline void folio_memcg_unlock(struct folio *folio)
> -{
> -}
> -
> -static inline bool mem_cgroup_trylock_pages(struct mem_cgroup *memcg)
> -{
> - /* to match folio_memcg_rcu() */
> - rcu_read_lock();
> - return true;
> -}
> -
> -static inline void mem_cgroup_unlock_pages(void)
> -{
> - rcu_read_unlock();
> -}
> -
> static inline void mem_cgroup_handle_over_high(gfp_t gfp_mask)
> {
> }
> @@ -1455,16 +1405,6 @@ static inline void mem_cgroup_exit_user_fault(void)
> {
> }
>
> -static inline bool task_in_memcg_oom(struct task_struct *p)
> -{
> - return false;
> -}
> -
> -static inline bool mem_cgroup_oom_synchronize(bool wait)
> -{
> - return false;
> -}
> -
> static inline struct mem_cgroup *mem_cgroup_get_oom_group(
> struct task_struct *victim, struct mem_cgroup *oom_domain)
> {
> @@ -1558,14 +1498,6 @@ void count_memcg_event_mm(struct mm_struct *mm, enum vm_event_item idx)
> static inline void split_page_memcg(struct page *head, int old_order, int new_order)
> {
> }
> -
> -static inline
> -unsigned long memcg1_soft_limit_reclaim(pg_data_t *pgdat, int order,
> - gfp_t gfp_mask,
> - unsigned long *total_scanned)
> -{
> - return 0;
> -}
> #endif /* CONFIG_MEMCG */
>
> /*
> @@ -1916,4 +1848,80 @@ static inline bool mem_cgroup_zswap_writeback_enabled(struct mem_cgroup *memcg)
> }
> #endif
>
> +
> +/* Cgroup v1-related declarations */
> +
> +#ifdef CONFIG_MEMCG
> +unsigned long memcg1_soft_limit_reclaim(pg_data_t *pgdat, int order,
> + gfp_t gfp_mask,
> + unsigned long *total_scanned);
> +
> +bool mem_cgroup_oom_synchronize(bool wait);
> +
> +static inline bool task_in_memcg_oom(struct task_struct *p)
> +{
> + return p->memcg_in_oom;
> +}
> +
> +void folio_memcg_lock(struct folio *folio);
> +void folio_memcg_unlock(struct folio *folio);
> +
> +/* try to stablize folio_memcg() for all the pages in a memcg */
> +static inline bool mem_cgroup_trylock_pages(struct mem_cgroup *memcg)
> +{
> + rcu_read_lock();
> +
> + if (mem_cgroup_disabled() || !atomic_read(&memcg->moving_account))
> + return true;
> +
> + rcu_read_unlock();
> + return false;
> +}
> +
> +static inline void mem_cgroup_unlock_pages(void)
> +{
> + rcu_read_unlock();
> +}
> +
> +#else /* CONFIG_MEMCG */
> +static inline
> +unsigned long memcg1_soft_limit_reclaim(pg_data_t *pgdat, int order,
> + gfp_t gfp_mask,
> + unsigned long *total_scanned)
> +{
> + return 0;
> +}
> +
> +static inline void folio_memcg_lock(struct folio *folio)
> +{
> +}
> +
> +static inline void folio_memcg_unlock(struct folio *folio)
> +{
> +}
> +
> +static inline bool mem_cgroup_trylock_pages(struct mem_cgroup *memcg)
> +{
> + /* to match folio_memcg_rcu() */
> + rcu_read_lock();
> + return true;
> +}
> +
> +static inline void mem_cgroup_unlock_pages(void)
> +{
> + rcu_read_unlock();
> +}
> +
> +static inline bool task_in_memcg_oom(struct task_struct *p)
> +{
> + return false;
> +}
> +
> +static inline bool mem_cgroup_oom_synchronize(bool wait)
> +{
> + return false;
> +}
> +
> +#endif /* CONFIG_MEMCG */
> +
> #endif /* _LINUX_MEMCONTROL_H */
> diff --git a/mm/memcontrol-v1.h b/mm/memcontrol-v1.h
> index 7d6ac4a4fb36..89d420793048 100644
> --- a/mm/memcontrol-v1.h
> +++ b/mm/memcontrol-v1.h
> @@ -5,15 +5,9 @@
>
> #include <linux/cgroup-defs.h>
>
> -void memcg1_remove_from_trees(struct mem_cgroup *memcg);
> -
> -static inline void memcg1_soft_limit_reset(struct mem_cgroup *memcg)
> -{
> - WRITE_ONCE(memcg->soft_limit, PAGE_COUNTER_MAX);
> -}
> +/* Cgroup v1 and v2 common declarations */
>
> void mem_cgroup_charge_statistics(struct mem_cgroup *memcg, int nr_pages);
> -void memcg1_check_events(struct mem_cgroup *memcg, int nid);
> int try_charge_memcg(struct mem_cgroup *memcg, gfp_t gfp_mask,
> unsigned int nr_pages);
>
> @@ -29,30 +23,6 @@ static inline int try_charge(struct mem_cgroup *memcg, gfp_t gfp_mask,
> void mem_cgroup_id_get_many(struct mem_cgroup *memcg, unsigned int n);
> void mem_cgroup_id_put_many(struct mem_cgroup *memcg, unsigned int n);
>
> -bool memcg1_wait_acct_move(struct mem_cgroup *memcg);
> -struct cgroup_taskset;
> -int memcg1_can_attach(struct cgroup_taskset *tset);
> -void memcg1_cancel_attach(struct cgroup_taskset *tset);
> -void memcg1_move_task(void);
> -
> -/*
> - * Per memcg event counter is incremented at every pagein/pageout. With THP,
> - * it will be incremented by the number of pages. This counter is used
> - * to trigger some periodic events. This is straightforward and better
> - * than using jiffies etc. to handle periodic memcg event.
> - */
> -enum mem_cgroup_events_target {
> - MEM_CGROUP_TARGET_THRESH,
> - MEM_CGROUP_TARGET_SOFTLIMIT,
> - MEM_CGROUP_NTARGETS,
> -};
> -
> -/* Whether legacy memory+swap accounting is active */
> -static bool do_memsw_account(void)
> -{
> - return !cgroup_subsys_on_dfl(memory_cgrp_subsys);
> -}
> -
> /*
> * Iteration constructs for visiting all cgroups (under a tree). If
> * loops are exited prematurely (break), mem_cgroup_iter_break() must
> @@ -68,24 +38,28 @@ static bool do_memsw_account(void)
> iter != NULL; \
> iter = mem_cgroup_iter(NULL, iter, NULL))
>
> -void memcg1_css_offline(struct mem_cgroup *memcg);
> +/* Whether legacy memory+swap accounting is active */
> +static bool do_memsw_account(void)
> +{
> + return !cgroup_subsys_on_dfl(memory_cgrp_subsys);
> +}
>
> -/* for encoding cft->private value on file */
> -enum res_type {
> - _MEM,
> - _MEMSWAP,
> - _KMEM,
> - _TCP,
> +/*
> + * Per memcg event counter is incremented at every pagein/pageout. With THP,
> + * it will be incremented by the number of pages. This counter is used
> + * to trigger some periodic events. This is straightforward and better
> + * than using jiffies etc. to handle periodic memcg event.
> + */
> +enum mem_cgroup_events_target {
> + MEM_CGROUP_TARGET_THRESH,
> + MEM_CGROUP_TARGET_SOFTLIMIT,
> + MEM_CGROUP_NTARGETS,
> };
>
> bool mem_cgroup_event_ratelimit(struct mem_cgroup *memcg,
> enum mem_cgroup_events_target target);
> unsigned long mem_cgroup_usage(struct mem_cgroup *memcg, bool swap);
>
> -bool memcg1_oom_prepare(struct mem_cgroup *memcg, bool *locked);
> -void memcg1_oom_finish(struct mem_cgroup *memcg, bool locked);
> -void memcg1_oom_recover(struct mem_cgroup *memcg);
> -
> void drain_all_stock(struct mem_cgroup *root_memcg);
> unsigned long mem_cgroup_nr_lru_pages(struct mem_cgroup *memcg,
> unsigned int lru_mask, bool tree);
> @@ -100,6 +74,37 @@ unsigned long memcg_page_state_output(struct mem_cgroup *memcg, int item);
> unsigned long memcg_page_state_local_output(struct mem_cgroup *memcg, int item);
> int memory_stat_show(struct seq_file *m, void *v);
>
> +/* Cgroup v1-specific declarations */
> +
> +void memcg1_remove_from_trees(struct mem_cgroup *memcg);
> +
> +static inline void memcg1_soft_limit_reset(struct mem_cgroup *memcg)
> +{
> + WRITE_ONCE(memcg->soft_limit, PAGE_COUNTER_MAX);
> +}
> +
> +bool memcg1_wait_acct_move(struct mem_cgroup *memcg);
> +
> +struct cgroup_taskset;
> +int memcg1_can_attach(struct cgroup_taskset *tset);
> +void memcg1_cancel_attach(struct cgroup_taskset *tset);
> +void memcg1_move_task(void);
> +void memcg1_css_offline(struct mem_cgroup *memcg);
> +
> +/* for encoding cft->private value on file */
> +enum res_type {
> + _MEM,
> + _MEMSWAP,
> + _KMEM,
> + _TCP,
> +};
> +
> +bool memcg1_oom_prepare(struct mem_cgroup *memcg, bool *locked);
> +void memcg1_oom_finish(struct mem_cgroup *memcg, bool locked);
> +void memcg1_oom_recover(struct mem_cgroup *memcg);
> +
> +void memcg1_check_events(struct mem_cgroup *memcg, int nid);
> +
> void memcg1_stat_format(struct mem_cgroup *memcg, struct seq_buf *s);
>
> extern struct cftype memsw_files[];
> --
> 2.45.2
--
Michal Hocko
SUSE Labs
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