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mm: memcontrol: eliminate raw access to stat and event counters

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Replace all raw 'this_cpu_' modifications of the stat and event per-cpu
counters with API functions such as mod_memcg_state().

This makes the code easier to read, but is also in preparation for the
next patch, which changes the per-cpu implementation of those counters.

Link: http://lkml.kernel.org/r/20171103153336.24044-1-hannes@cmpxchg.org
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Johannes Weiner 2018-01-31 16:16:37 -08:00 • committed by Linus Torvalds
parent 2b9fceb3b4
commit c9019e9bf4
2 changed files with 45 additions and 45 deletions
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31
include/linux/memcontrol.h
View file

@ -272,13 +272,6 @@ static inline bool mem_cgroup_disabled(void)
return !cgroup_subsys_enabled(memory_cgrp_subsys);
}
static inline void mem_cgroup_event(struct mem_cgroup *memcg,
enum memcg_event_item event)
{
this_cpu_inc(memcg->stat->events[event]);
cgroup_file_notify(&memcg->events_file);
}
bool mem_cgroup_low(struct mem_cgroup *root, struct mem_cgroup *memcg);
int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm,
@ -627,15 +620,23 @@ unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order,
gfp_t gfp_mask,
unsigned long *total_scanned);
/* idx can be of type enum memcg_event_item or vm_event_item */
static inline void __count_memcg_events(struct mem_cgroup *memcg,
int idx, unsigned long count)
{
if (!mem_cgroup_disabled())
__this_cpu_add(memcg->stat->events[idx], count);
}
/* idx can be of type enum memcg_event_item or vm_event_item */
static inline void count_memcg_events(struct mem_cgroup *memcg,
enum vm_event_item idx,
unsigned long count)
int idx, unsigned long count)
{
if (!mem_cgroup_disabled())
this_cpu_add(memcg->stat->events[idx], count);
}
/* idx can be of type enum memcg_stat_item or node_stat_item */
/* idx can be of type enum memcg_event_item or vm_event_item */
static inline void count_memcg_page_event(struct page *page,
int idx)
{
@ -654,12 +655,20 @@ static inline void count_memcg_event_mm(struct mm_struct *mm,
rcu_read_lock();
memcg = mem_cgroup_from_task(rcu_dereference(mm->owner));
if (likely(memcg)) {
this_cpu_inc(memcg->stat->events[idx]);
count_memcg_events(memcg, idx, 1);
if (idx == OOM_KILL)
cgroup_file_notify(&memcg->events_file);
}
rcu_read_unlock();
}
static inline void mem_cgroup_event(struct mem_cgroup *memcg,
enum memcg_event_item event)
{
count_memcg_events(memcg, event, 1);
cgroup_file_notify(&memcg->events_file);
}
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
void mem_cgroup_split_huge_fixup(struct page *head);
#endif