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memcg: make count_memcg_events re-entrant safe against irqs

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Let's make count_memcg_events re-entrant safe against irqs.  The only
thing needed is to convert the usage of __this_cpu_add() to
this_cpu_add().  In addition, with re-entrant safety, there is no need to
disable irqs.  Also add warnings for in_nmi() as it is not safe against
nmi context.

Link: https://lkml.kernel.org/r/20250514184158.3471331-5-shakeel.butt@linux.dev
Signed-off-by: Shakeel Butt <shakeel.butt@linux.dev>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Shakeel Butt 2025-05-14 11:41:55 -07:00 • committed by Andrew Morton
parent 8814e3b869
commit e52401e724
5 changed files with 19 additions and 36 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

21
include/linux/memcontrol.h
View file

@ -942,19 +942,8 @@ static inline void mod_lruvec_kmem_state(void *p, enum node_stat_item idx,
local_irq_restore(flags);
}
void __count_memcg_events(struct mem_cgroup *memcg, enum vm_event_item idx,
unsigned long count);
static inline void count_memcg_events(struct mem_cgroup *memcg,
enum vm_event_item idx,
unsigned long count)
{
unsigned long flags;
local_irq_save(flags);
__count_memcg_events(memcg, idx, count);
local_irq_restore(flags);
}
void count_memcg_events(struct mem_cgroup *memcg, enum vm_event_item idx,
unsigned long count);
static inline void count_memcg_folio_events(struct folio *folio,
enum vm_event_item idx, unsigned long nr)
@ -1418,12 +1407,6 @@ static inline void mod_lruvec_kmem_state(void *p, enum node_stat_item idx,
}
static inline void count_memcg_events(struct mem_cgroup *memcg,
enum vm_event_item idx,
unsigned long count)
{
}
static inline void __count_memcg_events(struct mem_cgroup *memcg,
enum vm_event_item idx,
unsigned long count)
{

6
mm/memcontrol-v1.c
View file

@ -512,9 +512,9 @@ static void memcg1_charge_statistics(struct mem_cgroup *memcg, int nr_pages)
{
/* pagein of a big page is an event. So, ignore page size */
if (nr_pages > 0)
__count_memcg_events(memcg, PGPGIN, 1);
count_memcg_events(memcg, PGPGIN, 1);
else {
__count_memcg_events(memcg, PGPGOUT, 1);
count_memcg_events(memcg, PGPGOUT, 1);
nr_pages = -nr_pages; /* for event */
}
@ -689,7 +689,7 @@ void memcg1_uncharge_batch(struct mem_cgroup *memcg, unsigned long pgpgout,
unsigned long flags;
local_irq_save(flags);
__count_memcg_events(memcg, PGPGOUT, pgpgout);
count_memcg_events(memcg, PGPGOUT, pgpgout);
__this_cpu_add(memcg->events_percpu->nr_page_events, nr_memory);
memcg1_check_events(memcg, nid);
local_irq_restore(flags);

6
mm/memcontrol.c
View file

@ -823,12 +823,12 @@ void __mod_lruvec_kmem_state(void *p, enum node_stat_item idx, int val)
}
/**
* __count_memcg_events - account VM events in a cgroup
* count_memcg_events - account VM events in a cgroup
* @memcg: the memory cgroup
* @idx: the event item
* @count: the number of events that occurred
*/
void __count_memcg_events(struct mem_cgroup *memcg, enum vm_event_item idx,
void count_memcg_events(struct mem_cgroup *memcg, enum vm_event_item idx,
unsigned long count)
{
int i = memcg_events_index(idx);
@ -842,7 +842,7 @@ void __count_memcg_events(struct mem_cgroup *memcg, enum vm_event_item idx,
cpu = get_cpu();
__this_cpu_add(memcg->vmstats_percpu->events[i], count);
this_cpu_add(memcg->vmstats_percpu->events[i], count);
memcg_rstat_updated(memcg, count, cpu);
trace_count_memcg_events(memcg, idx, count);

8
mm/swap.c
View file

@ -309,7 +309,7 @@ static void lru_activate(struct lruvec *lruvec, struct folio *folio)
trace_mm_lru_activate(folio);
__count_vm_events(PGACTIVATE, nr_pages);
__count_memcg_events(lruvec_memcg(lruvec), PGACTIVATE, nr_pages);
count_memcg_events(lruvec_memcg(lruvec), PGACTIVATE, nr_pages);
}
#ifdef CONFIG_SMP
@ -581,7 +581,7 @@ static void lru_deactivate_file(struct lruvec *lruvec, struct folio *folio)
if (active) {
__count_vm_events(PGDEACTIVATE, nr_pages);
__count_memcg_events(lruvec_memcg(lruvec), PGDEACTIVATE,
count_memcg_events(lruvec_memcg(lruvec), PGDEACTIVATE,
nr_pages);
}
}
@ -599,7 +599,7 @@ static void lru_deactivate(struct lruvec *lruvec, struct folio *folio)
lruvec_add_folio(lruvec, folio);
__count_vm_events(PGDEACTIVATE, nr_pages);
__count_memcg_events(lruvec_memcg(lruvec), PGDEACTIVATE, nr_pages);
count_memcg_events(lruvec_memcg(lruvec), PGDEACTIVATE, nr_pages);
}
static void lru_lazyfree(struct lruvec *lruvec, struct folio *folio)
@ -625,7 +625,7 @@ static void lru_lazyfree(struct lruvec *lruvec, struct folio *folio)
lruvec_add_folio(lruvec, folio);
__count_vm_events(PGLAZYFREE, nr_pages);
__count_memcg_events(lruvec_memcg(lruvec), PGLAZYFREE, nr_pages);
count_memcg_events(lruvec_memcg(lruvec), PGLAZYFREE, nr_pages);
}
/*

14
mm/vmscan.c
View file

@ -2028,7 +2028,7 @@ static unsigned long shrink_inactive_list(unsigned long nr_to_scan,
item = PGSCAN_KSWAPD + reclaimer_offset(sc);
if (!cgroup_reclaim(sc))
__count_vm_events(item, nr_scanned);
__count_memcg_events(lruvec_memcg(lruvec), item, nr_scanned);
count_memcg_events(lruvec_memcg(lruvec), item, nr_scanned);
__count_vm_events(PGSCAN_ANON + file, nr_scanned);
spin_unlock_irq(&lruvec->lru_lock);
@ -2048,7 +2048,7 @@ static unsigned long shrink_inactive_list(unsigned long nr_to_scan,
item = PGSTEAL_KSWAPD + reclaimer_offset(sc);
if (!cgroup_reclaim(sc))
__count_vm_events(item, nr_reclaimed);
__count_memcg_events(lruvec_memcg(lruvec), item, nr_reclaimed);
count_memcg_events(lruvec_memcg(lruvec), item, nr_reclaimed);
__count_vm_events(PGSTEAL_ANON + file, nr_reclaimed);
spin_unlock_irq(&lruvec->lru_lock);
@ -2138,7 +2138,7 @@ static void shrink_active_list(unsigned long nr_to_scan,
if (!cgroup_reclaim(sc))
__count_vm_events(PGREFILL, nr_scanned);
__count_memcg_events(lruvec_memcg(lruvec), PGREFILL, nr_scanned);
count_memcg_events(lruvec_memcg(lruvec), PGREFILL, nr_scanned);
spin_unlock_irq(&lruvec->lru_lock);
@ -2195,7 +2195,7 @@ static void shrink_active_list(unsigned long nr_to_scan,
nr_deactivate = move_folios_to_lru(lruvec, &l_inactive);
__count_vm_events(PGDEACTIVATE, nr_deactivate);
__count_memcg_events(lruvec_memcg(lruvec), PGDEACTIVATE, nr_deactivate);
count_memcg_events(lruvec_memcg(lruvec), PGDEACTIVATE, nr_deactivate);
__mod_node_page_state(pgdat, NR_ISOLATED_ANON + file, -nr_taken);
spin_unlock_irq(&lruvec->lru_lock);
@ -4612,8 +4612,8 @@ static int scan_folios(struct lruvec *lruvec, struct scan_control *sc,
__count_vm_events(item, isolated);
__count_vm_events(PGREFILL, sorted);
}
__count_memcg_events(memcg, item, isolated);
__count_memcg_events(memcg, PGREFILL, sorted);
count_memcg_events(memcg, item, isolated);
count_memcg_events(memcg, PGREFILL, sorted);
__count_vm_events(PGSCAN_ANON + type, isolated);
trace_mm_vmscan_lru_isolate(sc->reclaim_idx, sc->order, MAX_LRU_BATCH,
scanned, skipped, isolated,
@ -4763,7 +4763,7 @@ retry:
item = PGSTEAL_KSWAPD + reclaimer_offset(sc);
if (!cgroup_reclaim(sc))
__count_vm_events(item, reclaimed);
__count_memcg_events(memcg, item, reclaimed);
count_memcg_events(memcg, item, reclaimed);
__count_vm_events(PGSTEAL_ANON + type, reclaimed);
spin_unlock_irq(&lruvec->lru_lock);