ANDROID: vendor_hook: Add hooks to support reader optimistic spin in rwsem

Since upstream commit 617f3ef951 ("locking/rwsem: Remove
reader optimistic spinning"), vendors have seen increased
contention and blocking on rwsems.

There are attempts to actively fix this upstream:
  https://lore.kernel.org/lkml/20240406081126.8030-1-bongkyu7.kim@samsung.com/

But in the meantime, provide vendorhooks so that vendors can
implement their own optimistic spin routine. In doing so,
vendors see improvements in cold launch times on important apps.

Bug: 433638448
Bug: 331742151

Change-Id: I7466413de9ee1293e86f73880931235d7a9142ac
Signed-off-by: xieliujie <xieliujie@oppo.com>
[jstultz: Rewrote commit message]
Signed-off-by: John Stultz <jstultz@google.com>
(cherry picked from commit abe0af2abe51fae4fb072c8d7124aaa37f1da574)

include/trace/hooks/rwsem.h

@@ -47,6 +47,12 @@ DECLARE_HOOK(android_vh_clear_rwsem_writer_owned,
 DECLARE_HOOK(android_vh_rwsem_read_trylock_failed,
 	TP_PROTO(struct rw_semaphore *sem, long *cntp, int *ret),
 	TP_ARGS(sem, cntp, ret));
+DECLARE_HOOK(android_vh_rwsem_direct_rsteal,
+	TP_PROTO(struct rw_semaphore *sem, bool *steal),
+	TP_ARGS(sem, steal));
+DECLARE_HOOK(android_vh_rwsem_optimistic_rspin,
+	TP_PROTO(struct rw_semaphore *sem, long *adjustment, bool *rspin),
+	TP_ARGS(sem, adjustment, rspin));
 #endif /* _TRACE_HOOK_RWSEM_H */
 /* This part must be outside protection */
 #include <trace/define_trace.h>