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linux/mm/memcontrol-v1.h
Roman Gushchin b5855a26de mm: memcg: gather memcg1-specific fields initialization in memcg1_memcg_init() 
Gather all memcg1-specific struct mem_cgroup's members initialization in a
new memcg1_memcg_init() function, defined in mm/memcontrol-v1.c. 
Obviously, if CONFIG_MEMCG_V1 is not set, there is no need to initialize
these fields, so the function becomes trivial.

Link: https://lkml.kernel.org/r/20240628210317.272856-5-roman.gushchin@linux.dev
Signed-off-by: Roman Gushchin <roman.gushchin@linux.dev>
Acked-by: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Muchun Song <muchun.song@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2024-07-04 18:05:56 -07:00

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/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef __MM_MEMCONTROL_V1_H
#define __MM_MEMCONTROL_V1_H
#include <linux/cgroup-defs.h>
/* Cgroup v1 and v2 common declarations */
void mem_cgroup_charge_statistics(struct mem_cgroup *memcg, int nr_pages);
int try_charge_memcg(struct mem_cgroup *memcg, gfp_t gfp_mask,
unsigned int nr_pages);
static inline int try_charge(struct mem_cgroup *memcg, gfp_t gfp_mask,
unsigned int nr_pages)
{
if (mem_cgroup_is_root(memcg))
return 0;
return try_charge_memcg(memcg, gfp_mask, nr_pages);
}
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);
/*
* Iteration constructs for visiting all cgroups (under a tree). If
* loops are exited prematurely (break), mem_cgroup_iter_break() must
* be used for reference counting.
*/
#define for_each_mem_cgroup_tree(iter, root) \
for (iter = mem_cgroup_iter(root, NULL, NULL); \
iter != NULL; \
iter = mem_cgroup_iter(root, iter, NULL))
#define for_each_mem_cgroup(iter) \
for (iter = mem_cgroup_iter(NULL, NULL, NULL); \
iter != NULL; \
iter = mem_cgroup_iter(NULL, iter, NULL))
/* Whether legacy memory+swap accounting is active */
static bool do_memsw_account(void)
{
return !cgroup_subsys_on_dfl(memory_cgrp_subsys);
}
/*
* 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);
void drain_all_stock(struct mem_cgroup *root_memcg);
unsigned long memcg_events(struct mem_cgroup *memcg, int event);
unsigned long memcg_events_local(struct mem_cgroup *memcg, int event);
unsigned long memcg_page_state_local(struct mem_cgroup *memcg, int idx);
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 */
#ifdef CONFIG_MEMCG_V1
void memcg1_memcg_init(struct mem_cgroup *memcg);
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);
void memcg1_account_kmem(struct mem_cgroup *memcg, int nr_pages);
static inline bool memcg1_tcpmem_active(struct mem_cgroup *memcg)
{
return memcg->tcpmem_active;
}
bool memcg1_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages,
gfp_t gfp_mask);
static inline void memcg1_uncharge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages)
{
page_counter_uncharge(&memcg->tcpmem, nr_pages);
}
extern struct cftype memsw_files[];
extern struct cftype mem_cgroup_legacy_files[];
#else /* CONFIG_MEMCG_V1 */
static inline void memcg1_memcg_init(struct mem_cgroup *memcg) {}
static inline void memcg1_remove_from_trees(struct mem_cgroup *memcg) {}
static inline void memcg1_soft_limit_reset(struct mem_cgroup *memcg) {}
static inline bool memcg1_wait_acct_move(struct mem_cgroup *memcg) { return false; }
static inline void memcg1_css_offline(struct mem_cgroup *memcg) {}
static inline bool memcg1_oom_prepare(struct mem_cgroup *memcg, bool *locked) { return true; }
static inline void memcg1_oom_finish(struct mem_cgroup *memcg, bool locked) {}
static inline void memcg1_oom_recover(struct mem_cgroup *memcg) {}
static inline void memcg1_check_events(struct mem_cgroup *memcg, int nid) {}
static inline void memcg1_stat_format(struct mem_cgroup *memcg, struct seq_buf *s) {}
static inline void memcg1_account_kmem(struct mem_cgroup *memcg, int nr_pages) {}
static inline bool memcg1_tcpmem_active(struct mem_cgroup *memcg) { return false; }
static inline bool memcg1_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages,
gfp_t gfp_mask) { return true; }
static inline void memcg1_uncharge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages) {}
extern struct cftype memsw_files[];
extern struct cftype mem_cgroup_legacy_files[];
#endif /* CONFIG_MEMCG_V1 */
#endif /* __MM_MEMCONTROL_V1_H */
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