From becf6529603589c9cb8cfda398a585c0c2e01aae Mon Sep 17 00:00:00 2001 From: Dmitry Rokosov Date: Thu, 23 Nov 2023 10:19:44 +0300 Subject: samples/cgroup: introduce memcg memory.events listener This is a simple listener for memory events that handles counter changes in runtime. It can be set up for a specific memory cgroup v2. The output example: ===== $ /tmp/memcg_event_listener test Initialized MEMCG events with counters: MEMCG events: low: 0 high: 0 max: 0 oom: 0 oom_kill: 0 oom_group_kill: 0 Started 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 => 1 Received event in /sys/fs/cgroup/test/memory.events: *** 1 MEMCG oom_kill event, change counter 1 => 2 Received event in /sys/fs/cgroup/test/memory.events: *** 1 MEMCG oom_kill event, change counter 2 => 3 Received event in /sys/fs/cgroup/test/memory.events: *** 1 MEMCG oom_kill event, change counter 3 => 4 Received event in /sys/fs/cgroup/test/memory.events: *** 2 MEMCG max events, change counter 0 => 2 Received event in /sys/fs/cgroup/test/memory.events: *** 8 MEMCG max events, change counter 2 => 10 *** 1 MEMCG oom event, change counter 0 => 1 Received 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.com Signed-off-by: Dmitry Rokosov Cc: Johannes Weiner Cc: Michal Hocko Cc: Muchun Song Cc: Roman Gushchin Cc: Shakeel Butt Signed-off-by: Andrew Morton --- samples/cgroup/Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'samples/cgroup/Makefile') diff --git a/samples/cgroup/Makefile b/samples/cgroup/Makefile index deef4530f5e7..526c8569707c 100644 --- a/samples/cgroup/Makefile +++ b/samples/cgroup/Makefile @@ -1,5 +1,5 @@ # SPDX-License-Identifier: GPL-2.0 -userprogs-always-y += cgroup_event_listener +userprogs-always-y += cgroup_event_listener memcg_event_listener userccflags += -I usr/include -- cgit v1.2.3