cgroup: add tracing points for cgroup v2 freezer

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Add cgroup:cgroup_freeze and cgroup:cgroup_unfreeze events,
which are using the existing cgroup tracing infrastructure.

Add the cgroup_event event class, which is similar to the cgroup
class, but contains an additional integer field to store a new
value (the level field is dropped).

Also add two tracing events: cgroup_notify_populated and
cgroup_notify_frozen, which are raised in a generic way using
the TRACE_CGROUP_PATH() macro.

This allows to trace cgroup state transitions and is generally
helpful for debugging the cgroup freezer code.

Signed-off-by: Roman Gushchin <guro@fb.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

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Roman Gushchin 2019-04-19 10:03:08 -07:00 • committed by Tejun Heo

parent 712e351787

commit 4c476d8cff

3 changed files with 71 additions and 1 deletions

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include/trace/events/cgroup.h

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