Commit 859dc4ec authored Sep 04, 2024 by Tejun Heo

sched: Expose css_tg()



A new BPF extensible sched_class will use css_tg() in the init and exit
paths to visit all task_groups by walking cgroups.

v4: __setscheduler_prio() is already exposed. Dropped from this patch.

v3: Dropped SCHED_CHANGE_BLOCK() as upstream is adding more generic cleanup
    mechanism.

v2: Expose SCHED_CHANGE_BLOCK() too and update the description.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: David Vernet <dvernet@meta.com>
Acked-by: Josh Don <joshdon@google.com>
Acked-by: Hao Luo <haoluo@google.com>
Acked-by: Barret Rhoden <brho@google.com>

parent a8532fac

kernel/sched/core.c

+0 −5

Original line number	Diff line number	Diff line
		@@ -8942,11 +8942,6 @@ void sched_move_task(struct task_struct *tsk)
		}
		}

		static inline struct task_group css_tg(struct cgroup_subsys_state css)
		{
		return css ? container_of(css, struct task_group, css) : NULL;
		}

		static struct cgroup_subsys_state *
		cpu_cgroup_css_alloc(struct cgroup_subsys_state *parent_css)
		{

kernel/sched/sched.h

+5 −0

Original line number	Diff line number	Diff line
		@@ -514,6 +514,11 @@ static inline int walk_tg_tree(tg_visitor down, tg_visitor up, void *data)
		return walk_tg_tree_from(&root_task_group, down, up, data);
		}

		static inline struct task_group css_tg(struct cgroup_subsys_state css)
		{
		return css ? container_of(css, struct task_group, css) : NULL;
		}

		extern int tg_nop(struct task_group tg, void data);

		#ifdef CONFIG_FAIR_GROUP_SCHED