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ANDROID: vendor_hook: add hooks to protect locking-tsk in cpu scheduler

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Providing vendor hooks to record the start time of holding the lock, which
protects rwsem/mutex locking-process from being preemptedfor a short time
in some cases.

- android_vh_record_mutex_lock_starttime
- android_vh_record_rtmutex_lock_starttime
- android_vh_record_rwsem_lock_starttime
- android_vh_record_percpu_rwsem_lock_starttime

Bug: 241191475

Signed-off-by: Peifeng Li <lipeifeng@oppo.com>
Change-Id: I0e967a1e8b77c32a1ad588acd54028fae2f90c4e
This commit is contained in:
Peifeng Li
2022-08-03 19:42:27 +08:00
committed by Matthias Männich
parent fb39cdb9ea
commit eed2741ae6
7 changed files with 76 additions and 7 deletions
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11
kernel/locking/mutex.c
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@@ -170,8 +170,10 @@ static __always_inline bool __mutex_trylock_fast(struct mutex *lock)
unsigned long curr = (unsigned long)current;
unsigned long zero = 0UL;
if (atomic_long_try_cmpxchg_acquire(&lock->owner, &zero, curr))
if (atomic_long_try_cmpxchg_acquire(&lock->owner, &zero, curr)) {
trace_android_vh_record_mutex_lock_starttime(current, jiffies);
return true;
}
return false;
}
@@ -748,6 +750,7 @@ static noinline void __sched __mutex_unlock_slowpath(struct mutex *lock, unsigne
*/
void __sched mutex_unlock(struct mutex *lock)
{
trace_android_vh_record_mutex_lock_starttime(current, 0);
#ifndef CONFIG_DEBUG_LOCK_ALLOC
if (__mutex_unlock_fast(lock))
return;
@@ -978,6 +981,7 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
lock_acquired(&lock->dep_map, ip);
if (ww_ctx)
ww_mutex_set_context_fastpath(ww, ww_ctx);
trace_android_vh_record_mutex_lock_starttime(current, jiffies);
preempt_enable();
return 0;
}
@@ -1097,6 +1101,7 @@ skip_wait:
spin_unlock(&lock->wait_lock);
preempt_enable();
trace_android_vh_record_mutex_lock_starttime(current, jiffies);
return 0;
err:
@@ -1433,8 +1438,10 @@ int __sched mutex_trylock(struct mutex *lock)
#endif
locked = __mutex_trylock(lock);
if (locked)
if (locked) {
trace_android_vh_record_mutex_lock_starttime(current, jiffies);
mutex_acquire(&lock->dep_map, 0, 1, _RET_IP_);
}
return locked;
}