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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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9
include/linux/percpu-rwsem.h
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@@ -9,6 +9,9 @@
#include <linux/rcu_sync.h>
#include <linux/lockdep.h>
void _trace_android_vh_record_percpu_rwsem_lock_starttime(
struct task_struct *tsk, unsigned long settime);
struct percpu_rw_semaphore {
struct rcu_sync rss;
unsigned int __percpu *read_count;
@@ -73,6 +76,7 @@ static inline void percpu_down_read(struct percpu_rw_semaphore *sem)
* bleeding the critical section out.
*/
preempt_enable();
_trace_android_vh_record_percpu_rwsem_lock_starttime(current, jiffies);
}
static inline bool percpu_down_read_trylock(struct percpu_rw_semaphore *sem)
@@ -93,14 +97,17 @@ static inline bool percpu_down_read_trylock(struct percpu_rw_semaphore *sem)
* bleeding the critical section out.
*/
if (ret)
if (ret) {
_trace_android_vh_record_percpu_rwsem_lock_starttime(current, jiffies);
rwsem_acquire_read(&sem->dep_map, 0, 1, _RET_IP_);
}
return ret;
}
static inline void percpu_up_read(struct percpu_rw_semaphore *sem)
{
_trace_android_vh_record_percpu_rwsem_lock_starttime(current, 0);
rwsem_release(&sem->dep_map, _RET_IP_);
preempt_disable();