linux-toradex.git/kernel/cgroup/debug.c, branch v4.13-rc2

cgroup: fix lockdep warning in debug controller

2017-06-14T20:01:41+00:00

The debug controller grabs cgroup_mutex from interface file show
functions which can deadlock and triggers lockdep warnings.  Fix it by
using cgroup_kn_lock_live()/cgroup_kn_unlock() instead.

Signed-off-by: Tejun Heo 
Cc: Waiman Long

cgroup: refactor cgroup_masks_read() in the debug controller

2017-06-14T20:01:36+00:00

Factor out cgroup_masks_read_one() out of cgroup_masks_read() for
simplicity.

Signed-off-by: Tejun Heo 
Cc: Waiman Long

cgroup: make debug an implicit controller on cgroup2

2017-06-14T20:01:32+00:00

Make debug an implicit controller on cgroup2 which is enabled by
"cgroup_debug" boot param.

Signed-off-by: Tejun Heo 
Cc: Waiman Long

cgroup: Make debug cgroup support v2 and thread mode

2017-06-14T20:01:21+00:00

Besides supporting cgroup v2 and thread mode, the following changes
are also made:
 1) current_* cgroup files now resides only at the root as we don't
    need duplicated files of the same function all over the cgroup
    hierarchy.
 2) The cgroup_css_links_read() function is modified to report
    the number of tasks that are skipped because of overflow.
 3) The number of extra unaccounted references are displayed.
 4) The current_css_set_read() function now prints out the addresses of
    the css'es associated with the current css_set.
 5) A new cgroup_subsys_states file is added to display the css objects
    associated with a cgroup.
 6) A new cgroup_masks file is added to display the various controller
    bit masks in the cgroup.

tj: Dropped thread mode related information for now so that debug
    controller changes aren't blocked on the thread mode.

Signed-off-by: Waiman Long 
Signed-off-by: Tejun Heo

cgroup: Make Kconfig prompt of debug cgroup more accurate

2017-06-14T20:01:21+00:00

The Kconfig prompt and description of the debug cgroup controller
more accurate by saying that it is for debug purpose only and its
interfaces are unstable.

Signed-off-by: Waiman Long 
Signed-off-by: Tejun Heo

cgroup: Move debug cgroup to its own file

2017-06-14T20:01:21+00:00

The debug cgroup currently resides within cgroup-v1.c and is enabled
only for v1 cgroup. To enable the debug cgroup also for v2, it makes
sense to put the code into its own file as it will no longer be v1
specific. There is no change to the debug cgroup specific code.

Signed-off-by: Waiman Long 
Signed-off-by: Tejun Heo