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mm: memcg: move charge migration code to memcontrol-v1.c

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Unlike the legacy cgroup v1 memory controller, cgroup v2 memory controller
doesn't support moving charged pages between cgroups.

It's a fairly large and complicated code which created a number of
problems in the past.  Let's move this code into memcontrol-v1.c.  It
shaves off 1k lines from memcontrol.c.  It's also another step towards
making the legacy memory controller code optionally compiled.

Link: https://lkml.kernel.org/r/20240625005906.106920-5-roman.gushchin@linux.dev
Signed-off-by: Roman Gushchin <roman.gushchin@linux.dev>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Muchun Song <muchun.song@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Roman Gushchin 2024-06-24 17:58:56 -07:00 committed by Andrew Morton
parent 87024f5837
commit e548ad4a7c
3 changed files with 1019 additions and 996 deletions
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981
mm/memcontrol-v1.c
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30
mm/memcontrol-v1.h
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@ -11,4 +11,34 @@ static inline void memcg1_soft_limit_reset(struct mem_cgroup *memcg)
WRITE_ONCE(memcg->soft_limit, PAGE_COUNTER_MAX);
}
void mem_cgroup_charge_statistics(struct mem_cgroup *memcg, int nr_pages);
void memcg_check_events(struct mem_cgroup *memcg, int nid);
void memcg_oom_recover(struct mem_cgroup *memcg);
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);
bool mem_cgroup_wait_acct_move(struct mem_cgroup *memcg);
struct cgroup_taskset;
int mem_cgroup_can_attach(struct cgroup_taskset *tset);
void mem_cgroup_cancel_attach(struct cgroup_taskset *tset);
void mem_cgroup_move_task(void);
struct cftype;
u64 mem_cgroup_move_charge_read(struct cgroup_subsys_state *css,
struct cftype *cft);
int mem_cgroup_move_charge_write(struct cgroup_subsys_state *css,
struct cftype *cft, u64 val);
#endif /* __MM_MEMCONTROL_V1_H */

1004
mm/memcontrol.c
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