ANDROID: sched: Add rvh for cpu controller cgroup attach

Add a restricted vendor hook when a set of tasks change the cgroups in
the cpu controller. This facilitates various scheduler value adds.

Bug: 175045928
Change-Id: I544046d631f4d6c9bc2b999e054b5a296ec31a81
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>

drivers/android/vendor_hooks.c

@@ -113,3 +113,4 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_account_irq);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_place_entity);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_update_cpu_capacity);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_update_misfit_status);
+EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_cpu_cgroup_attach);

include/trace/hooks/sched.h

@@ -189,6 +189,11 @@ DECLARE_RESTRICTED_HOOK(android_rvh_update_cpu_capacity,
 DECLARE_RESTRICTED_HOOK(android_rvh_update_misfit_status,
 	TP_PROTO(struct task_struct *p, struct rq *rq, bool *need_update),
 	TP_ARGS(p, rq, need_update), 1);
+
+struct cgroup_taskset;
+DECLARE_RESTRICTED_HOOK(android_rvh_cpu_cgroup_attach,
+	TP_PROTO(struct cgroup_taskset *tset),
+	TP_ARGS(tset), 1);
 #else
 #define trace_android_rvh_select_task_rq_fair(p, prev_cpu, sd_flag, wake_flags, new_cpu)
 #define trace_android_rvh_select_task_rq_rt(p, prev_cpu, sd_flag, wake_flags, new_cpu)
@@ -232,6 +237,7 @@ DECLARE_RESTRICTED_HOOK(android_rvh_update_misfit_status,
 #define trace_android_rvh_place_entity(se, vruntime)
 #define trace_android_rvh_update_cpu_capacity(cpu, capacity)
 #define trace_android_rvh_update_misfit_status(p, rq, need_update)
+#define trace_android_rvh_cpu_cgroup_attach(tset)
 #endif
 #endif /* _TRACE_HOOK_SCHED_H */
 /* This part must be outside protection */

kernel/sched/core.c

@@ -7856,6 +7856,8 @@ static void cpu_cgroup_attach(struct cgroup_taskset *tset)
 
 	cgroup_taskset_for_each(task, css, tset)
 		sched_move_task(task);
+
+	trace_android_rvh_cpu_cgroup_attach(tset);
 }
 
 #ifdef CONFIG_UCLAMP_TASK_GROUP