android/android_kernel_samsung_sm8650
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ANDROID: sched: Add trace hook for rt throttle dump

Browse Source 
Create a trace hook when RT tasks are throttled. This allows
vendors to debug long RT runs.

Bug: 172264047
Change-Id: I534959f8e8d714463aac2f9f1c5627d2e735f543
Signed-off-by: Sai Harshini Nimmala <snimmala@codeaurora.org>
This commit is contained in:
Sai Harshini Nimmala 2020-11-02 14:52:34 -08:00 committed by Todd Kjos
parent 561eb836a3
commit bf3d991a7d
3 changed files with 14 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/android/vendor_hooks.c
View File

@ -63,3 +63,4 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_gic_resume);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_wq_lockup_pool);
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);

6
include/trace/hooks/sched.h
View File

@ -70,6 +70,11 @@ 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));
#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)
@ -85,6 +90,7 @@ DECLARE_RESTRICTED_HOOK(android_rvh_find_busiest_group,
#define trace_android_rvh_set_user_nice(p, nice)
#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)
#endif
#endif /* _TRACE_HOOK_SCHED_H */
/* This part must be outside protection */

7
kernel/sched/rt.c
View File

@ -973,6 +973,13 @@ static int sched_rt_runtime_exceeded(struct rt_rq *rt_rq)
if (likely(rt_b->rt_runtime)) {
rt_rq->rt_throttled = 1;
printk_deferred_once("sched: RT throttling activated\n");
trace_android_vh_dump_throttled_rt_tasks(
raw_smp_processor_id(),
rq_clock(rq_of_rt_rq(rt_rq)),
sched_rt_period(rt_rq),
runtime,
hrtimer_get_expires_ns(&rt_b->rt_period_timer));
} else {
/*
* In case we did anyway, make it go away,