tmakin/ack-tegra
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ANDROID: vendor_hooks: export cgroup_threadgroup_rwsem

Browse Source 
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: 425550656
Bug: 348699619
Bug: 297785167

Signed-off-by: liuxudong5 <liuxudong5@xiaomi.com>
Change-Id: I2297dfbc2f2681581241f85a3b4fd59415ea67db
(cherry picked from commit d2b35f36dc91f349148f4a6515088081ab7645c8)
This commit is contained in:
liuxudong5
2023-08-15 11:24:01 +08:00
committed by Treehugger Robot
parent 764e54b8e9
commit 159dbf7174
1 changed files with 1 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
kernel/cgroup/cgroup.c
View File

@@ -115,6 +115,7 @@ 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() && \