linux-kernel - [PATCH 1/3] memcg: don't call propagate_protected

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Message-ID: <20250228075808.207484-2-shakeel.butt@linux.dev>
Date: Thu, 27 Feb 2025 23:58:06 -0800
From: Shakeel Butt <shakeel.butt@...ux.dev>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...nel.org>,
	Roman Gushchin <roman.gushchin@...ux.dev>,
	Muchun Song <muchun.song@...ux.dev>,
	linux-mm@...ck.org,
	cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Meta kernel team <kernel-team@...a.com>
Subject: [PATCH 1/3] memcg: don't call propagate_protected_usage() for v1

Memcg-v1 does not support memory protection (min/low) and thus there is
no need to track protected memory usage for it.

Signed-off-by: Shakeel Butt <shakeel.butt@...ux.dev>
---
 mm/memcontrol.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 55b0e9482c00..36b2dfbc86c0 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -3601,6 +3601,7 @@ mem_cgroup_css_alloc(struct cgroup_subsys_state *parent_css)
 {
 	struct mem_cgroup *parent = mem_cgroup_from_css(parent_css);
 	struct mem_cgroup *memcg, *old_memcg;
+	bool memcg_on_dfl = cgroup_subsys_on_dfl(memory_cgrp_subsys);
 
 	old_memcg = set_active_memcg(parent);
 	memcg = mem_cgroup_alloc(parent);
@@ -3618,7 +3619,7 @@ mem_cgroup_css_alloc(struct cgroup_subsys_state *parent_css)
 	if (parent) {
 		WRITE_ONCE(memcg->swappiness, mem_cgroup_swappiness(parent));
 
-		page_counter_init(&memcg->memory, &parent->memory, true);
+		page_counter_init(&memcg->memory, &parent->memory, memcg_on_dfl);
 		page_counter_init(&memcg->swap, &parent->swap, false);
 #ifdef CONFIG_MEMCG_V1
 		WRITE_ONCE(memcg->oom_kill_disable, READ_ONCE(parent->oom_kill_disable));
@@ -3638,7 +3639,7 @@ mem_cgroup_css_alloc(struct cgroup_subsys_state *parent_css)
 		return &memcg->css;
 	}
 
-	if (cgroup_subsys_on_dfl(memory_cgrp_subsys) && !cgroup_memory_nosocket)
+	if (memcg_on_dfl && !cgroup_memory_nosocket)
 		static_branch_inc(&memcg_sockets_enabled_key);
 
 	if (!cgroup_memory_nobpf)
-- 
2.43.5