memcg: initiate deprecation of pressure_level
The pressure_level in memcg v1 provides memory pressure notifications to the user space. At the moment it provides notifications for three levels of memory pressure i.e. low, medium and critical, which are defined based on internal memory reclaim implementation details. More specifically the ratio of scanned and reclaimed pages during a memory reclaim. However this is not robust as there are workloads with mostly unreclaimable user memory or kernel memory. For v2, the users can use PSI for memory pressure status of the system or the cgroup. Let's start the deprecation process for pressure_level and add warnings to gather the info on how the current users are using this interface and how they can be used to PSI. Link: https://lkml.kernel.org/r/20240814220021.3208384-5-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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@ -86,6 +86,8 @@ Brief summary of control files.
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used.
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used.
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memory.force_empty trigger forced page reclaim
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memory.force_empty trigger forced page reclaim
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memory.pressure_level set memory pressure notifications
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memory.pressure_level set memory pressure notifications
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This knob is deprecated and shouldn't be
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used.
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memory.swappiness set/show swappiness parameter of vmscan
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memory.swappiness set/show swappiness parameter of vmscan
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(See sysctl's vm.swappiness)
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(See sysctl's vm.swappiness)
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memory.move_charge_at_immigrate set/show controls of moving charges
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memory.move_charge_at_immigrate set/show controls of moving charges
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@ -898,8 +900,10 @@ At reading, current status of OOM is shown.
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The number of processes belonging to this cgroup killed by any
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The number of processes belonging to this cgroup killed by any
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kind of OOM killer.
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kind of OOM killer.
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11. Memory Pressure
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11. Memory Pressure (DEPRECATED)
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===================
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================================
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THIS IS DEPRECATED!
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The pressure level notifications can be used to monitor the memory
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The pressure level notifications can be used to monitor the memory
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allocation cost; based on the pressure, applications can implement
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allocation cost; based on the pressure, applications can implement
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@ -2000,6 +2000,9 @@ static ssize_t memcg_write_event_control(struct kernfs_open_file *of,
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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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pr_warn_once("pressure_level 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 = vmpressure_register_event;
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event->register_event = vmpressure_register_event;
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event->unregister_event = vmpressure_unregister_event;
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event->unregister_event = vmpressure_unregister_event;
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} else if (!strcmp(name, "memory.memsw.usage_in_bytes")) {
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} else if (!strcmp(name, "memory.memsw.usage_in_bytes")) {
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