ANDROID: vendor_hooks: Add hook for jiffies updates

Create a vendor hook for jiffies updates by the
tick_do_timer_cpu.

Bug: 148928265
Change-Id: Ia442e20d446b8ce4f2b3f2be76655e72919c76eb
Signed-off-by: Amir Vajid <avajid@codeaurora.org>

drivers/android/vendor_hooks.c

@@ -66,3 +66,4 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_ipi_stop);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_sysrq_crash);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_dump_throttled_rt_tasks);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_printk_hotplug);
+EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_jiffies_update);

include/trace/hooks/sched.h

@@ -70,11 +70,15 @@ struct sched_group;
 DECLARE_RESTRICTED_HOOK(android_rvh_find_busiest_group,
 	TP_PROTO(struct sched_group *busiest, struct rq *dst_rq, int *out_balance),
 		TP_ARGS(busiest, dst_rq, out_balance), 1);
+
 DECLARE_HOOK(android_vh_dump_throttled_rt_tasks,
 	TP_PROTO(int cpu, u64 clock, ktime_t rt_period, u64 rt_runtime,
 			s64 rt_period_timer_expires),
 	TP_ARGS(cpu, clock, rt_period, rt_runtime, rt_period_timer_expires));
 
+DECLARE_HOOK(android_vh_jiffies_update,
+	TP_PROTO(void *unused),
+	TP_ARGS(unused));
 #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)
@@ -91,6 +95,7 @@ DECLARE_HOOK(android_vh_dump_throttled_rt_tasks,
 #define trace_android_rvh_setscheduler(p)
 #define trace_android_rvh_find_busiest_group(busiest, dst_rq, out_balance)
 #define trace_android_vh_dump_throttled_rt_tasks(cpu, clock, rt_period, rt_runtime, rt_period_timer_expires)
+#define trace_android_vh_jiffies_update(unused)
 #endif
 #endif /* _TRACE_HOOK_SCHED_H */
 /* This part must be outside protection */

kernel/time/tick-common.c

@@ -17,6 +17,7 @@
 #include <linux/sched.h>
 #include <linux/module.h>
 #include <trace/events/power.h>
+#include <trace/hooks/sched.h>
 
 #include <asm/irq_regs.h>
 
@@ -94,6 +95,7 @@ static void tick_periodic(int cpu)
 		write_seqcount_end(&jiffies_seq);
 		raw_spin_unlock(&jiffies_lock);
 		update_wall_time();
+		trace_android_vh_jiffies_update(NULL);
 	}
 
 	update_process_times(user_mode(get_irq_regs()));

kernel/time/tick-sched.c

@@ -25,6 +25,7 @@
 #include <linux/posix-timers.h>
 #include <linux/context_tracking.h>
 #include <linux/mm.h>
+#include <trace/hooks/sched.h>
 
 #include <asm/irq_regs.h>
 
@@ -143,8 +144,10 @@ static void tick_sched_do_timer(struct tick_sched *ts, ktime_t now)
 #endif
 
 	/* Check, if the jiffies need an update */
-	if (tick_do_timer_cpu == cpu)
+	if (tick_do_timer_cpu == cpu) {
 		tick_do_update_jiffies64(now);
+		trace_android_vh_jiffies_update(NULL);
+	}
 
 	if (ts->inidle)
 		ts->got_idle_tick = 1;