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ANDROID: vendor_hooks: export cgroup_threadgroup_rwsem

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When the task wakes up from percpu_rwsem_wait, it will enter a long
runnable state, which will cause frame loss when the application
starts. In order to solve this problem, we need to let the process
enter the "vip" queue when it is woken up, so we need to set a flag
for the process holding the lock to prove that it is about to hold
the lock. Most of this long runnable state occurs in the
cgroup_threadgroup_rwsem, so we only care cgroup_threadgroup_rwsem,
and cgroup_threadgroup_rwsem should be exported. Finally, if the
semaphore is of cgroup_threadgroup_rwsem type and has a flag,
then let it join the "vip" queue.

Bug: 297785167
Signed-off-by: liuxudong <liuxudong5@xiaomi.com>
Change-Id: I2297dfbc2f2681581241f85a3b4fd59415ea67db
This commit is contained in:
liuxudong5 2023-08-15 11:24:01 +08:00 committed by Todd Kjos
parent 1fb9e95d46
commit 176d72d941
1 changed files with 1 additions and 0 deletions
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kernel/cgroup/cgroup.c
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@ -114,6 +114,7 @@ static DEFINE_SPINLOCK(cgroup_idr_lock);
static DEFINE_SPINLOCK(cgroup_file_kn_lock);
DEFINE_PERCPU_RWSEM(cgroup_threadgroup_rwsem);
EXPORT_SYMBOL_GPL(cgroup_threadgroup_rwsem);
#define cgroup_assert_mutex_or_rcu_locked() \
RCU_LOCKDEP_WARN(!rcu_read_lock_held() && \