Commit 19d0e98c authored Mar 06, 2026 by Tejun Heo

sched/core: Swap the order between sched_post_fork() and cgroup_post_fork()



The planned sched_ext cgroup sub-scheduler support needs the newly forked
task to be associated with its cgroup in its post_fork() hook. There is no
existing ordering requirement between the two now. Swap them and note the
new ordering requirement.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
Cc: Ingo Molnar <mingo@redhat.com>

parent e3715e39

kernel/fork.c

+5 −1

Original line number	Diff line number	Diff line
		@@ -2463,8 +2463,12 @@ __latent_entropy struct task_struct *copy_process(
		fd_install(pidfd, pidfile);

		proc_fork_connector(p);
		sched_post_fork(p);
		/*
		* sched_ext needs @p to be associated with its cgroup in its post_fork
		* hook. cgroup_post_fork() should come before sched_post_fork().
		*/
		cgroup_post_fork(p, args);
		sched_post_fork(p);
		perf_event_fork(p);

		trace_task_newtask(p, clone_flags);