commit 23fd5bd08ad499b14cbb945c25dd9f2671ca36ab
author Jay <jaytwang@google.com> Tue Jul 26 17:50:50 2022 +0000
committer Jay <jaytwang@google.com> Thu Jul 28 18:32:36 2022 +0000
tree 248f81eabe6d1aa03363180668a548cb77d48739
parent b5065713d2f4d98fa67fcb47293b73e48c7a7adc

Increase result dispatcher thread priority

When the system has high CPU load, result dispatcher thread is frequently
in runnable state and causes the delay to post the result to the framework.

Bug: 237909133
Test: GCA, CTS, frame rate test
Change-Id: I7be2d6d38f36439eb25b03e15aa3f76cb97c152a

common/hal/utils/result_dispatcher.cc

diff --git a/common/hal/utils/result_dispatcher.cc b/common/hal/utils/result_dispatcher.cc
index 6aa2d12..fdf9502 100644
--- a/common/hal/utils/result_dispatcher.cc
+++ b/common/hal/utils/result_dispatcher.cc
@@ -21,6 +21,7 @@
 
 #include <inttypes.h>
 #include <log/log.h>
+#include <sys/resource.h>
 #include <utils/Trace.h>
 
 #include <string>
@@ -67,6 +68,15 @@
     } else {
       ALOGI("[%s] %s: SetRealtimeThread OK", name_.c_str(), __FUNCTION__);
     }
+  } else {
+    // Assign higher priority to reduce the preemption when CPU usage is high
+    int32_t res = setpriority(
+        PRIO_PROCESS,
+        pthread_gettid_np(notify_callback_thread_.native_handle()), -20);
+    if (res != 0) {
+      ALOGE("[%s] %s: Set thread priority fail with error: %s", name_.c_str(),
+            __FUNCTION__, strerror(errno));
+    }
   }
 }