becf6529 - samples/cgroup: introduce memcg memory.events listener

Thu, 23 Nov 2023 07:19:44 +0000

samples/cgroup: introduce memcg memory.events listenerThis is a simple listener for memory events that handles counter changesin runtime. It can be set up for a specific memory cgroup v2.The output example:=====$ /tmp/memcg_event_listener testInitialized MEMCG events with counters:MEMCG events: low: 0 high: 0 max: 0 oom: 0 oom_kill: 0 oom_group_kill: 0Started monitoring memory events from '/sys/fs/cgroup/test/memory.events'...Received event in /sys/fs/cgroup/test/memory.events:*** 1 MEMCG oom_kill event, change counter 0 => 1Received event in /sys/fs/cgroup/test/memory.events:*** 1 MEMCG oom_kill event, change counter 1 => 2Received event in /sys/fs/cgroup/test/memory.events:*** 1 MEMCG oom_kill event, change counter 2 => 3Received event in /sys/fs/cgroup/test/memory.events:*** 1 MEMCG oom_kill event, change counter 3 => 4Received event in /sys/fs/cgroup/test/memory.events:*** 2 MEMCG max events, change counter 0 => 2Received event in /sys/fs/cgroup/test/memory.events:*** 8 MEMCG max events, change counter 2 => 10*** 1 MEMCG oom event, change counter 0 => 1Received event in /sys/fs/cgroup/test/memory.events:*** 1 MEMCG oom_kill event, change counter 4 => 5^CExiting memcg event listener...=====Link: https://lkml.kernel.org/r/20231123071945.25811-3-ddrokosov@salutedevices.comSigned-off-by: Dmitry Rokosov Cc: Johannes Weiner Cc: Michal Hocko Cc: Muchun Song Cc: Roman Gushchin Cc: Shakeel Butt Signed-off-by: Andrew Morton List of files: /linux-6.15/samples/cgroup/Makefile

60433a9d - samples: introduce new samples subdir for cgroup

Thu, 23 Nov 2023 07:19:43 +0000

samples: introduce new samples subdir for cgroupPatch series "samples: introduce cgroup events listeners", v3.To begin with, this patch series relocates the cgroup example code to thesamples/cgroup directory, which is the appropriate location for such codesnippets.Furthermore, a new memcg events listener is introduced. This listener isa simple yet effective tool for monitoring memory events and managingcounter changes during runtime.Additionally, as per Andrew Morton's suggestion, a helpful remindercomment is included in the memcontrol implementation. This comment servesto ensure that the samples code is updated whenever new events are added.This patch (of 3):Move the cgroup_event_listener for cgroup v1 to the samples directory. This suggestion was proposed by Andrew Morton during the discussion [1].Link: https://lore.kernel.org/all/20231106140934.3f5d4960141562fe8da53906@linux-foundation.org/ [1]Link: https://lkml.kernel.org/r/20231123071945.25811-1-ddrokosov@salutedevices.comLink: https://lkml.kernel.org/r/20231123071945.25811-2-ddrokosov@salutedevices.comSigned-off-by: Dmitry Rokosov Cc: Johannes Weiner Cc: Michal Hocko Cc: Muchun Song Cc: Roman Gushchin Cc: Shakeel Butt Signed-off-by: Andrew Morton List of files: /linux-6.15/samples/cgroup/Makefile

Changes in Makefile

becf6529 - samples/cgroup: introduce memcg memory.events listener

60433a9d - samples: introduce new samples subdir for cgroup