memcg: use mod_node_page_state to update stats

Patch series "memcg: cleanup the memcg stats interfaces".

The memcg stats are safe against irq (and nmi) context and thus does not
require disabling irqs.  However for some stats which are also maintained
at node level, it is using irq unsafe interface and thus requiring the
users to still disables irqs or use interfaces which explicitly disables
irqs.  Let's move memcg code to use irq safe node level stats function
which is already optimized for architectures with HAVE_CMPXCHG_LOCAL (all
major ones), so there will not be any performance penalty for its usage.


This patch (of 4):

The memcg stats are safe against irq (and nmi) context and thus does not
require disabling irqs.  However some code paths for memcg stats also
update the node level stats and use irq unsafe interface and thus require
the users to disable irqs.  However node level stats, on architectures
with HAVE_CMPXCHG_LOCAL (all major ones), has interface which does not
require irq disabling.  Let's move memcg stats code to start using that
interface for node level stats.

Link: https://lkml.kernel.org/r/20251110232008.1352063-1-shakeel.butt@linux.dev
Link: https://lkml.kernel.org/r/20251110232008.1352063-2-shakeel.butt@linux.dev
Signed-off-by: Shakeel Butt <shakeel.butt@linux.dev>
Reviewed-by: Harry Yoo <harry.yoo@oracle.com>
Acked-by: Roman Gushchin <roman.gushchin@linux.dev>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Qi Zheng <zhengqi.arch@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 623446821b00..7e6407b8bfb7 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -770,7 +770,7 @@ void __mod_lruvec_state(struct lruvec *lruvec, enum node_stat_item idx,
 			int val)
 {
 	/* Update node */
-	__mod_node_page_state(lruvec_pgdat(lruvec), idx, val);
+	mod_node_page_state(lruvec_pgdat(lruvec), idx, val);
 
 	/* Update memcg and lruvec */
 	if (!mem_cgroup_disabled())
@@ -789,7 +789,7 @@ void __lruvec_stat_mod_folio(struct folio *folio, enum node_stat_item idx,
 	/* Untracked pages have no memcg, no lruvec. Update only the node */
 	if (!memcg) {
 		rcu_read_unlock();
-		__mod_node_page_state(pgdat, idx, val);
+		mod_node_page_state(pgdat, idx, val);
 		return;
 	}
 
@@ -815,7 +815,7 @@ void __mod_lruvec_kmem_state(void *p, enum node_stat_item idx, int val)
 	 * vmstats to keep it correct for the root memcg.
 	 */
 	if (!memcg) {
-		__mod_node_page_state(pgdat, idx, val);
+		mod_node_page_state(pgdat, idx, val);
 	} else {
 		lruvec = mem_cgroup_lruvec(memcg, pgdat);
 		__mod_lruvec_state(lruvec, idx, val);