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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
Download Patch File Download Diff File Expand all files Collapse all files

8
kernel/locking/rtmutex.c
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@@ -1471,6 +1471,7 @@ static inline void __rt_mutex_lock(struct rt_mutex *lock, unsigned int subclass)
mutex_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
rt_mutex_fastlock(lock, TASK_UNINTERRUPTIBLE, rt_mutex_slowlock);
trace_android_vh_record_rtmutex_lock_starttime(current, jiffies);
}
#ifdef CONFIG_DEBUG_LOCK_ALLOC
@@ -1519,6 +1520,8 @@ int __sched rt_mutex_lock_interruptible(struct rt_mutex *lock)
ret = rt_mutex_fastlock(lock, TASK_INTERRUPTIBLE, rt_mutex_slowlock);
if (ret)
mutex_release(&lock->dep_map, _RET_IP_);
else
trace_android_vh_record_rtmutex_lock_starttime(current, jiffies);
return ret;
}
@@ -1563,6 +1566,8 @@ rt_mutex_timed_lock(struct rt_mutex *lock, struct hrtimer_sleeper *timeout)
rt_mutex_slowlock);
if (ret)
mutex_release(&lock->dep_map, _RET_IP_);
else
trace_android_vh_record_rtmutex_lock_starttime(current, jiffies);
return ret;
}
@@ -1589,6 +1594,8 @@ int __sched rt_mutex_trylock(struct rt_mutex *lock)
ret = rt_mutex_fasttrylock(lock, rt_mutex_slowtrylock);
if (ret)
mutex_acquire(&lock->dep_map, 0, 1, _RET_IP_);
else
trace_android_vh_record_rtmutex_lock_starttime(current, jiffies);
return ret;
}
@@ -1603,6 +1610,7 @@ void __sched rt_mutex_unlock(struct rt_mutex *lock)
{
mutex_release(&lock->dep_map, _RET_IP_);
rt_mutex_fastunlock(lock, rt_mutex_slowunlock);
trace_android_vh_record_rtmutex_lock_starttime(current, 0);
}
EXPORT_SYMBOL_GPL(rt_mutex_unlock);