commit 4a71a73843d974490c0c8ccdf7318bbc54b6bd42
author Chia-I Wu <olv@google.com> Fri Feb 10 08:11:55 2017 -0800
committer Chia-I Wu <olv@google.com> Fri Feb 10 12:23:45 2017 -0800
tree 4dfc0c36f65905fed1ef96a7bd2c278326f2bb57
parent 71b3bafa59e2a2637536a283cc30e5ae385708f1

graphics: use FIFO scheduler in IComposer

Make IComposer default implementation use the same process scheduler
as SurfaceFlinger does.

Bug: 35210697
Test: manual
Change-Id: Ie2ebe1d3fd26505984d9f6c33d63b5db36b0b64a

graphics/composer/2.1/default/android.hardware.graphics.composer@2.1-service.rc

diff --git a/graphics/composer/2.1/default/android.hardware.graphics.composer@2.1-service.rc b/graphics/composer/2.1/default/android.hardware.graphics.composer@2.1-service.rc
index fc21d59..9548d41 100644
--- a/graphics/composer/2.1/default/android.hardware.graphics.composer@2.1-service.rc
+++ b/graphics/composer/2.1/default/android.hardware.graphics.composer@2.1-service.rc
@@ -2,4 +2,5 @@
     class hal
     user system
     group graphics drmrpc readproc
+    capabilities SYS_NICE
     onrestart restart surfaceflinger

graphics/composer/2.1/default/service.cpp

diff --git a/graphics/composer/2.1/default/service.cpp b/graphics/composer/2.1/default/service.cpp
index a31decd..656673e 100644
--- a/graphics/composer/2.1/default/service.cpp
+++ b/graphics/composer/2.1/default/service.cpp
@@ -16,6 +16,8 @@
 
 #define LOG_TAG "android.hardware.graphics.composer@2.1-service"
 
+#include <sched.h>
+
 #include <android/hardware/graphics/composer/2.1/IComposer.h>
 
 #include <binder/ProcessState.h>
@@ -29,5 +31,13 @@
     android::ProcessState::self()->setThreadPoolMaxThreadCount(4);
     android::ProcessState::self()->startThreadPool();
 
+    // same as SF main thread
+    struct sched_param param = {0};
+    param.sched_priority = 2;
+    if (sched_setscheduler(0, SCHED_FIFO | SCHED_RESET_ON_FORK,
+                &param) != 0) {
+        ALOGE("Couldn't set SCHED_FIFO: %d", errno);
+    }
+
     return defaultPassthroughServiceImplementation<IComposer>("hwcomposer");
 }