Commit 8cc38fa7 authored by Tejun Heo's avatar Tejun Heo
Browse files

cgroup: make debug an implicit controller on cgroup2 



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

Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Cc: Waiman Long <longman@redhat.com>
parent 575313f4

kernel/cgroup/debug.c

+56 −3
Original line number Diff line number Diff line
@@ -240,7 +240,7 @@ static u64 releasable_read(struct cgroup_subsys_state *css, struct cftype *cft) 
		!css_has_online_children(&css->cgroup->self));

}



static struct cftype debug_files[] =  {

static struct cftype debug_legacy_files[] =  {

	{

		.name = "taskcount",

		.read_u64 = debug_taskcount_read,
@@ -287,9 +287,62 @@ static struct cftype debug_files[] = { 
	{ }	/* terminate */

};



static struct cftype debug_files[] =  {

	{

		.name = "taskcount",

		.read_u64 = debug_taskcount_read,

	},



	{

		.name = "current_css_set",

		.seq_show = current_css_set_read,

		.flags = CFTYPE_ONLY_ON_ROOT,

	},



	{

		.name = "current_css_set_refcount",

		.read_u64 = current_css_set_refcount_read,

		.flags = CFTYPE_ONLY_ON_ROOT,

	},



	{

		.name = "current_css_set_cg_links",

		.seq_show = current_css_set_cg_links_read,

		.flags = CFTYPE_ONLY_ON_ROOT,

	},



	{

		.name = "css_links",

		.seq_show = cgroup_css_links_read,

	},



	{

		.name = "csses",

		.seq_show = cgroup_subsys_states_read,

	},



	{

		.name = "masks",

		.seq_show = cgroup_masks_read,

	},



	{ }	/* terminate */

};



struct cgroup_subsys debug_cgrp_subsys = {

	.css_alloc	= debug_css_alloc,

	.css_free	= debug_css_free,

	.legacy_cftypes	= debug_files,

	.dfl_cftypes	= debug_files,

	.legacy_cftypes	= debug_legacy_files,

};



/*

 * On v2, debug is an implicit controller enabled by "cgroup_debug" boot

 * parameter.

 */

static int __init enable_cgroup_debug(char *str)

{

	debug_cgrp_subsys.dfl_cftypes = debug_files;

	debug_cgrp_subsys.implicit_on_dfl = true;

	return 1;

}

__setup("cgroup_debug", enable_cgroup_debug);