commit 90f7c37361c22f86bd3d63d22c27fbea34c188e1
author Zhijun He <zhijunhe@google.com> Tue Aug 16 16:19:43 2016 -0700
committer Zhijun He <zhijunhe@google.com> Tue Aug 16 16:27:55 2016 -0700
tree 5f4f092af79056faf9962d9aa7d4de77cd845a31
parent 15223ec262f8f1135be6ee727a480dd4a04457e7

Camera3Device: add prop to disable sched fifo

to disable sched fifo:
adb root
adb shell setprop camera.fifo.disable 1

Bug: 30898724

Change-Id: Ic3d1d15f9deb36b49e7d710d60fac969a98a1730

services/camera/libcameraservice/device3/Camera3Device.cpp

diff --git a/services/camera/libcameraservice/device3/Camera3Device.cpp b/services/camera/libcameraservice/device3/Camera3Device.cpp
index 5703934..aeab451 100644
--- a/services/camera/libcameraservice/device3/Camera3Device.cpp
+++ b/services/camera/libcameraservice/device3/Camera3Device.cpp
@@ -42,6 +42,7 @@
 #include <utils/Log.h>
 #include <utils/Trace.h>
 #include <utils/Timers.h>
+#include <cutils/properties.h>
 
 #include <android/hardware/camera2/ICameraDeviceUser.h>
 
@@ -2037,15 +2038,20 @@
     // across configure_streams() calls
     mRequestThread->configurationComplete(mIsConstrainedHighSpeedConfiguration);
 
-    // Boost priority of request thread to SCHED_FIFO.
-    pid_t requestThreadTid = mRequestThread->getTid();
-    res = requestPriority(getpid(), requestThreadTid,
-            kRequestThreadPriority, /*asynchronous*/ false);
-    if (res != OK) {
-        ALOGW("Can't set realtime priority for request processing thread: %s (%d)",
-                strerror(-res), res);
-    } else {
-        ALOGD("Set real time priority for request queue thread (tid %d)", requestThreadTid);
+    char value[PROPERTY_VALUE_MAX];
+    property_get("camera.fifo.disable", value, "0");
+    int32_t disableFifo = atoi(value);
+    if (disableFifo != 1) {
+        // Boost priority of request thread to SCHED_FIFO.
+        pid_t requestThreadTid = mRequestThread->getTid();
+        res = requestPriority(getpid(), requestThreadTid,
+                kRequestThreadPriority, /*asynchronous*/ false);
+        if (res != OK) {
+            ALOGW("Can't set realtime priority for request processing thread: %s (%d)",
+                    strerror(-res), res);
+        } else {
+            ALOGD("Set real time priority for request queue thread (tid %d)", requestThreadTid);
+        }
     }
 
     // Update device state