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| author | Shakeel Butt <shakeel.butt@linux.dev> | 2024-08-14 15:00:19 -0700 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-09-01 20:26:20 -0700 |
| commit | 569c4f62d84af874deaa2a31ad200f695d6d67dd (patch) | |
| tree | b02e5324a88da2e9577ed96361e940226c6e9d3f /mm/memcontrol-v1.c | |
| parent | d046ff46ee3b920ac617564226d2a0494d9af772 (diff) | |
| download | lwn-569c4f62d84af874deaa2a31ad200f695d6d67dd.tar.gz lwn-569c4f62d84af874deaa2a31ad200f695d6d67dd.zip | |
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 <shakeel.butt@linux.dev>
Reviewed-by: T.J. Mercier <tjmercier@google.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Muchun Song <muchun.song@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/memcontrol-v1.c')
| -rw-r--r-- | mm/memcontrol-v1.c | 3 |
1 files changed, 3 insertions, 0 deletions
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; } |