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DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1747248160; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=SUZYKygsw0cKUEN+JGdm3r/cNIBlAjnoiVTSGdy45nM=; b=HPtxLwPjDj5tqjCFtwX92LOzUI2qCAAx7nVFvpOlYx50xbs4s/Fy13Y9s9Qvw+8xVxiY8H V2WCjEYTPudskCJM673GcxuVhRiR162USn+/2ztfctd5+lkECGf8FDLJSGd2TjK79GGOBf cCXBYez5Bq6M6ZySrPh5GHB1M/dPDqc= From: Shakeel Butt To: Andrew Morton Cc: Johannes Weiner , Michal Hocko , Roman Gushchin , Muchun Song , Vlastimil Babka , Alexei Starovoitov , Sebastian Andrzej Siewior , Harry Yoo , Yosry Ahmed , bpf@vger.kernel.org, linux-mm@kvack.org, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, Meta kernel team Subject: [PATCH v2 4/7] memcg: make count_memcg_events re-entrant safe against irqs Date: Wed, 14 May 2025 11:41:55 -0700 Message-ID: <20250514184158.3471331-5-shakeel.butt@linux.dev> In-Reply-To: <20250514184158.3471331-1-shakeel.butt@linux.dev> References: <20250514184158.3471331-1-shakeel.butt@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Stat-Signature: u1futdswf4ni43ngqyqi4h51m7k5ii8f X-Rspam-User: X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 5B746180008 X-HE-Tag: 1747248162-900894 X-HE-Meta: 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 wK9HS20q mOc5mRKVCOjVyBdhyQhMmFmZz63c+fAvIgd4Rd+uYbbUm4gn6Eg7FqF0WmlkbsbpBYIYwjHVfHRuj0rif5aM+obxqzcd/JktfoeuuV3dYY5sxSBrGLNuRoqMzWHkFA9RPLbP2lCtDgmv+iQwIIJEoVIjMgtG2yQ6lRVgiE418EgZDr9HPx9EecE7uMAjKGZbW2YDPjpdEzD/HkIoIPHL8S4ySpmjhucs//BIE X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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. Signed-off-by: Shakeel Butt Acked-by: Vlastimil Babka --- include/linux/memcontrol.h | 21 ++------------------- mm/memcontrol-v1.c | 6 +++--- mm/memcontrol.c | 6 +++--- mm/swap.c | 8 ++++---- mm/vmscan.c | 14 +++++++------- 5 files changed, 19 insertions(+), 36 deletions(-) diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index 92861ff3c43f..f7848f73f41c 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -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) { diff --git a/mm/memcontrol-v1.c b/mm/memcontrol-v1.c index 54c49cbfc968..4b94731305b9 100644 --- a/mm/memcontrol-v1.c +++ b/mm/memcontrol-v1.c @@ -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); diff --git a/mm/memcontrol.c b/mm/memcontrol.c index c5a835071610..0923072386c2 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -825,12 +825,12 @@ 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); @@ -844,7 +844,7 @@ 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); diff --git a/mm/swap.c b/mm/swap.c index 77b2d5997873..4fc322f7111a 100644 --- a/mm/swap.c +++ b/mm/swap.c @@ -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); } /* diff --git a/mm/vmscan.c b/mm/vmscan.c index 5efd939d8c76..f86d264558f5 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -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); @@ -4616,8 +4616,8 @@ static int scan_folios(unsigned long nr_to_scan, struct lruvec *lruvec, __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, @@ -4769,7 +4769,7 @@ static int evict_folios(unsigned long nr_to_scan, struct lruvec *lruvec, 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); -- 2.47.1