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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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17
kernel/locking/percpu-rwsem.c
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@@ -10,6 +10,21 @@
#include <linux/slab.h>
#include <linux/errno.h>
#include <trace/hooks/dtask.h>
/*
* trace_android_vh_record_percpu_rwsem_lock_starttime is called in
* include/linux/percpu-rwsem.h by including include/hooks/dtask.h, which
* will result to build-err. So we create
* func:_trace_android_vh_record_percpu_rwsem_lock_starttime for percpu-rwsem.h to call.
*/
void _trace_android_vh_record_percpu_rwsem_lock_starttime(struct task_struct *tsk,
unsigned long settime)
{
trace_android_vh_record_percpu_rwsem_lock_starttime(tsk, settime);
}
EXPORT_SYMBOL_GPL(_trace_android_vh_record_percpu_rwsem_lock_starttime);
int __percpu_init_rwsem(struct percpu_rw_semaphore *sem,
const char *name, struct lock_class_key *key)
{
@@ -237,11 +252,13 @@ void percpu_down_write(struct percpu_rw_semaphore *sem)
/* Wait for all active readers to complete. */
rcuwait_wait_event(&sem->writer, readers_active_check(sem), TASK_UNINTERRUPTIBLE);
trace_android_vh_record_percpu_rwsem_lock_starttime(current, jiffies);
}
EXPORT_SYMBOL_GPL(percpu_down_write);
void percpu_up_write(struct percpu_rw_semaphore *sem)
{
trace_android_vh_record_percpu_rwsem_lock_starttime(current, 0);
rwsem_release(&sem->dep_map, _RET_IP_);
/*