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This commit adds tests for some of the core functionalities
of cgroups v2.
The commit adds tests for some core principles of croup V2 API:
- test_cgcore_internal_process_constraint
Tests internal process constraint.
You can't add a pid to a domain parent if a controller is enabled.
- test_cgcore_top_down_constraint_enable
Tests that you can't enable a controller on a child if it's not enabled
on the parent.
- test_cgcore_top_down_constraint_disable
Tests that you can't disable a controller on a parent if it's
enabled in a child.
- test_cgcore_no_internal_process_constraint_on_threads
Tests that there's no internal process constrain on threaded cgroups.
You can add threads/processes on a parent with a controller enabled.
- test_cgcore_parent_becomes_threaded
Tests that when a child becomes threaded the parent type becomes
domain threaded.
- test_cgcore_invalid_domain
In a situation like:
A (domain threaded) - B (threaded) - C (domain)
it tests that C can't be used until it is turned into a threaded cgroup.
The "cgroup.type" file will report "domain (invalid)" in these cases.
Operations which fail due to invalid topology use EOPNOTSUPP as the errno.
- test_cgcore_populated
In a situation like:
A(0) - B(0) - C(1)
\ D(0)
It tests that A, B and C's "populated" fields would be 1 while D's 0.
It tests that after the one process in C is moved to root, A,B and C's
"populated" fields would flip to "0" and file modified events will
be generated on the "cgroup.events" files of both cgroups.
Signed-off-by: Claudio Zumbo <claudioz@fb.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Roman Gushchin <guro@fb.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: kernel-team@fb.com
Acked-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Roman Gushchin <guro@fb.com>
Signed-off-by: Shuah Khan (Samsung OSG) <shuah@kernel.org>
d863cb03fc