memcg: initiate deprecation of oom_control
The oom_control provides functionality to disable memcg oom-killer, notifications on oom-kill and reading the stats regarding oom-kills. This interface was mainly introduced to provide functionality for userspace oom-killers. However it is not robust enough and only supports OOM handling in the page fault path. For v2, the users can use the combination of memory.events notifications, memory.high and PSI to provide userspace OOM-killing functionality. Actually LMKD in Android and OOMd in systemd and Meta infrastructure already use PSI in combination with other stats to implement userspace OOM-killing. Let's start the deprecation process for v1 and gather the info on how the current users are using this interface and work on providing a more robust functionality in v2. Link: https://lkml.kernel.org/r/20240814220021.3208384-4-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>
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@ -92,6 +92,8 @@ Brief summary of control files.
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This knob is deprecated and shouldn't be
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This knob is deprecated and shouldn't be
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used.
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used.
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memory.oom_control set/show oom controls.
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memory.oom_control set/show oom controls.
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This knob is deprecated and shouldn't be
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used.
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memory.numa_stat show the number of memory usage per numa
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memory.numa_stat show the number of memory usage per numa
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node
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node
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memory.kmem.limit_in_bytes Deprecated knob to set and read the kernel
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memory.kmem.limit_in_bytes Deprecated knob to set and read the kernel
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@ -846,8 +848,10 @@ It's applicable for root and non-root cgroup.
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.. _cgroup-v1-memory-oom-control:
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.. _cgroup-v1-memory-oom-control:
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10. OOM Control
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10. OOM Control (DEPRECATED)
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===============
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============================
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THIS IS DEPRECATED!
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memory.oom_control file is for OOM notification and other controls.
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memory.oom_control file is for OOM notification and other controls.
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@ -1994,6 +1994,9 @@ static ssize_t memcg_write_event_control(struct kernfs_open_file *of,
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event->register_event = mem_cgroup_usage_register_event;
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event->register_event = mem_cgroup_usage_register_event;
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event->unregister_event = mem_cgroup_usage_unregister_event;
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event->unregister_event = mem_cgroup_usage_unregister_event;
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} else if (!strcmp(name, "memory.oom_control")) {
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} else if (!strcmp(name, "memory.oom_control")) {
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pr_warn_once("oom_control is deprecated and will be removed. "
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"Please report your usecase to linux-mm-@kvack.org"
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" if you depend on this functionality. \n");
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event->register_event = mem_cgroup_oom_register_event;
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event->register_event = mem_cgroup_oom_register_event;
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event->unregister_event = mem_cgroup_oom_unregister_event;
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event->unregister_event = mem_cgroup_oom_unregister_event;
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} else if (!strcmp(name, "memory.pressure_level")) {
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} else if (!strcmp(name, "memory.pressure_level")) {
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@ -2841,6 +2844,10 @@ static int mem_cgroup_oom_control_write(struct cgroup_subsys_state *css,
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{
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{
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struct mem_cgroup *memcg = mem_cgroup_from_css(css);
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struct mem_cgroup *memcg = mem_cgroup_from_css(css);
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pr_warn_once("oom_control is deprecated and will be removed. "
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"Please report your usecase to linux-mm-@kvack.org if you "
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"depend on this functionality. \n");
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/* cannot set to root cgroup and only 0 and 1 are allowed */
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/* cannot set to root cgroup and only 0 and 1 are allowed */
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if (mem_cgroup_is_root(memcg) || !((val == 0) || (val == 1)))
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if (mem_cgroup_is_root(memcg) || !((val == 0) || (val == 1)))
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return -EINVAL;
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return -EINVAL;
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