From 569c4f62d84af874deaa2a31ad200f695d6d67dd Mon Sep 17 00:00:00 2001 From: Shakeel Butt Date: Wed, 14 Aug 2024 15:00:19 -0700 Subject: memcg: initiate deprecation of v1 soft limit Memcg v1 provides soft limit functionality for the best effort memory sharing between multiple workloads on a system. It is usually triggered through kswapd and at the moment does not reclaim kernel memory. Memcg v2 provides more straightforward best effort (memory.low) and hard protection (memory.min) functionalities. Let's initiate the deprecation of soft limit from v1 and gather if v2 needs something more to move the existing v1 users to v2 regarding soft limit. Link: https://lkml.kernel.org/r/20240814220021.3208384-3-shakeel.butt@linux.dev Signed-off-by: Shakeel Butt Reviewed-by: T.J. Mercier Acked-by: Michal Hocko Acked-by: Roman Gushchin Cc: Johannes Weiner Cc: Muchun Song Signed-off-by: Andrew Morton --- mm/memcontrol-v1.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'mm/memcontrol-v1.c') diff --git a/mm/memcontrol-v1.c b/mm/memcontrol-v1.c index 89944f83afb3..fe3d8809a8be 100644 --- a/mm/memcontrol-v1.c +++ b/mm/memcontrol-v1.c @@ -2545,6 +2545,9 @@ static ssize_t mem_cgroup_write(struct kernfs_open_file *of, if (IS_ENABLED(CONFIG_PREEMPT_RT)) { ret = -EOPNOTSUPP; } else { + pr_warn_once("soft_limit_in_bytes is deprecated and will be removed. " + "Please report your usecase to linux-mm@kvack.org if you " + "depend on this functionality.\n"); WRITE_ONCE(memcg->soft_limit, nr_pages); ret = 0; } -- cgit