uid_sys_stats: change to use rt_mutex
We see this happens multiple times in heavy workload in systrace
and AMS stuck in uid_lock.
Running process: Process 953
Running thread: android.ui
State: Uninterruptible Sleep
Start:
1,025.628 ms
Duration:
27,955.949 ms
On CPU:
Running instead: system_server
Args:
{kernel callsite when blocked:: "uid_procstat_write+0xb8/0x144"}
Changing to rt_mutex can mitigate the priority inversion
Bug: 34991231
Bug: 34193533
Test: on marlin
Change-Id: I28eb3971331cea60b1075740c792ab87d103262c
Signed-off-by: Wei Wang <wvw@google.com>
1 file changed