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ANDROID: vendor_hooks: Add hooks for oem percpu-rwsem optimaton

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Recently we have discovered many lag issues caused by percpu_rwsem
lock-holding tasks not being scheduled for a long time. we need to
identify them and provide appropriate scheduling protection in our
oem scheduler.
To support this, we add one hook below:
    trace_android_vh_percpu_rwsem_wq_add

Bug: 301066838
Change-Id: Id770c1a7978842abfc62d3fa9aeb5ac7a1904972
Signed-off-by: xieliujie <xieliujie@oppo.com>
(cherry picked from commit f451f4a59950135ea9a6ede218c58f10dbb3abaa)
This commit is contained in:
xieliujie 2023-09-26 10:26:32 +08:00
parent 180ea0f6d4
commit d3961f624b
3 changed files with 8 additions and 0 deletions
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1
drivers/android/vendor_hooks.c
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@ -106,6 +106,7 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_binder_wakeup_ilocked);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_do_send_sig_info);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_process_killed);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_killed_process);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_percpu_rwsem_wq_add);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_rwsem_init);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_rwsem_wake);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_rwsem_write_finished);

6
include/trace/hooks/dtask.h
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@ -99,6 +99,12 @@ DECLARE_HOOK(android_vh_record_pcpu_rwsem_starttime,
TP_PROTO(struct task_struct *tsk, unsigned long settime_jiffies),
TP_ARGS(tsk, settime_jiffies));
struct percpu_rw_semaphore;
DECLARE_HOOK(android_vh_percpu_rwsem_wq_add,
TP_PROTO(struct percpu_rw_semaphore *sem, bool reader),
TP_ARGS(sem, reader));
/* macro versions of hooks are no longer required */
#endif /* _TRACE_HOOK_DTASK_H */

1
kernel/locking/percpu-rwsem.c
View File

@ -166,6 +166,7 @@ static void percpu_rwsem_wait(struct percpu_rw_semaphore *sem, bool reader)
if (wait) {
wq_entry.flags |= WQ_FLAG_EXCLUSIVE | reader * WQ_FLAG_CUSTOM;
__add_wait_queue_entry_tail(&sem->waiters, &wq_entry);
trace_android_vh_percpu_rwsem_wq_add(sem, reader);
}
spin_unlock_irq(&sem->waiters.lock);