Add property for background GC type

To disable background compaction do:
adb shell setprop dalvik.vm.backgroundgctype CMS

To enable:
adb shell setprop dalvik.vm.backgroundgctype SS

Change-Id: I1d87b95fceaedac4df5ce6e718d7c14b35d524cc

1 files changed, 8 insertions, 0 deletions

diff --git a/core/jni/AndroidRuntime.cpp b/core/jni/AndroidRuntime.cpp
index 362a54ec1a47..fc6cc81cc8ee 100644
--- a/core/jni/AndroidRuntime.cpp
+++ b/core/jni/AndroidRuntime.cpp
@@ -467,6 +467,7 @@ int AndroidRuntime::startVm(JavaVM** pJavaVM, JNIEnv** pEnv)
     char heapminfreeOptsBuf[sizeof("-XX:HeapMinFree=")-1 + PROPERTY_VALUE_MAX];
     char heapmaxfreeOptsBuf[sizeof("-XX:HeapMaxFree=")-1 + PROPERTY_VALUE_MAX];
     char gctypeOptsBuf[sizeof("-Xgc:")-1 + PROPERTY_VALUE_MAX];
+    char backgroundgcOptsBuf[sizeof("-XX:BackgroundGC=")-1 + PROPERTY_VALUE_MAX];
     char heaptargetutilizationOptsBuf[sizeof("-XX:HeapTargetUtilization=")-1 + PROPERTY_VALUE_MAX];
     char jitcodecachesizeOptsBuf[sizeof("-Xjitcodecachesize:")-1 + PROPERTY_VALUE_MAX];
     char dalvikVmLibBuf[PROPERTY_VALUE_MAX];
@@ -620,6 +621,13 @@ int AndroidRuntime::startVm(JavaVM** pJavaVM, JNIEnv** pEnv)
         mOptions.add(opt);
     }
 
+    strcpy(backgroundgcOptsBuf, "-XX:BackgroundGC=");
+    property_get("dalvik.vm.backgroundgctype", backgroundgcOptsBuf+sizeof("-XX:BackgroundGC=")-1, "");
+    if (backgroundgcOptsBuf[sizeof("-XX:BackgroundGC=")-1] != '\0') {
+        opt.optionString = backgroundgcOptsBuf;
+        mOptions.add(opt);
+    }
+
     /*
      * Enable or disable dexopt features, such as bytecode verification and
      * calculation of register maps for precise GC.