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sched_ext: Introduce cgroup_lifetime_notifier

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Other subsystems may make use of the cgroup hierarchy with the cgroup_bpf
support being one such example. For such a feature, it's useful to be able
to hook into cgroup creation and destruction paths to perform
feature-specific initializations and cleanups.

Add cgroup_lifetime_notifier which generates CGROUP_LIFETIME_ONLINE and
CGROUP_LIFETIME_OFFLINE events whenever cgroups are created and destroyed,
respectively.

The next patch will convert cgroup_bpf to use the new notifier and other
uses are planned.

Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo
2025-05-14 00:44:44 -04:00
parent cd22cbad1b
commit 9e8c67a9e5
2 changed files with 34 additions and 2 deletions
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9
include/linux/cgroup.h
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@@ -19,6 +19,7 @@
#include <linux/kernfs.h>
#include <linux/jump_label.h>
#include <linux/types.h>
#include <linux/notifier.h>
#include <linux/ns_common.h>
#include <linux/nsproxy.h>
#include <linux/user_namespace.h>
@@ -40,7 +41,7 @@ struct kernel_clone_args;
#ifdef CONFIG_CGROUPS
enum {
enum css_task_iter_flags {
CSS_TASK_ITER_PROCS = (1U << 0), /* walk only threadgroup leaders */
CSS_TASK_ITER_THREADED = (1U << 1), /* walk all threaded css_sets in the domain */
CSS_TASK_ITER_SKIPPED = (1U << 16), /* internal flags */
@@ -66,10 +67,16 @@ struct css_task_iter {
struct list_head iters_node; /* css_set->task_iters */
};
enum cgroup_lifetime_events {
CGROUP_LIFETIME_ONLINE,
CGROUP_LIFETIME_OFFLINE,
};
extern struct file_system_type cgroup_fs_type;
extern struct cgroup_root cgrp_dfl_root;
extern struct css_set init_css_set;
extern spinlock_t css_set_lock;
extern struct blocking_notifier_head cgroup_lifetime_notifier;
#define SUBSYS(_x) extern struct cgroup_subsys _x ## _cgrp_subsys;
#include <linux/cgroup_subsys.h>