Zygote: Reset niceness if lazy preloading is enabled.
By definition, the zygote in question is lower priority if lazy
preloading is enabled. We therefore reset the zygote process'
niceness to 0 as soon as it comes up, rather than having it stick
around as a higher priority process until we eventually ask it
to load the default set of resources.
Test: manual.
Change-Id: I3ccfc0e7c3fdebf5f798d90b53140a554bf64c20
diff --git a/core/java/com/android/internal/os/Zygote.java b/core/java/com/android/internal/os/Zygote.java
index 59416dd..fa71a62 100644
--- a/core/java/com/android/internal/os/Zygote.java
+++ b/core/java/com/android/internal/os/Zygote.java
@@ -173,6 +173,10 @@
VM_HOOKS.postForkChild(debugFlags, isSystemServer, instructionSet);
}
+ /**
+ * Resets this process' priority to the default value (0).
+ */
+ native static void nativeResetNicePriority();
/**
* Executes "/system/bin/sh -c <command>" using the exec() system call.
diff --git a/core/java/com/android/internal/os/ZygoteInit.java b/core/java/com/android/internal/os/ZygoteInit.java
index a72b66a..1fb31b4 100644
--- a/core/java/com/android/internal/os/ZygoteInit.java
+++ b/core/java/com/android/internal/os/ZygoteInit.java
@@ -712,6 +712,8 @@
EventLog.writeEvent(LOG_BOOT_PROGRESS_PRELOAD_END,
SystemClock.uptimeMillis());
bootTimingsTraceLog.traceEnd(); // ZygotePreload
+ } else {
+ Zygote.nativeResetNicePriority();
}
// Finish profiling the zygote initialization.
diff --git a/core/jni/com_android_internal_os_Zygote.cpp b/core/jni/com_android_internal_os_Zygote.cpp
index e2fc444..c3f0e9d 100644
--- a/core/jni/com_android_internal_os_Zygote.cpp
+++ b/core/jni/com_android_internal_os_Zygote.cpp
@@ -806,6 +806,10 @@
UnmountTree("/storage");
}
+static void com_android_internal_os_Zygote_nativeResetNicePriority(JNIEnv* env, jclass) {
+ ResetNicePriority(env);
+}
+
static const JNINativeMethod gMethods[] = {
{ "nativeForkAndSpecialize",
"(II[II[[IILjava/lang/String;Ljava/lang/String;[I[ILjava/lang/String;Ljava/lang/String;)I",
@@ -815,7 +819,9 @@
{ "nativeAllowFileAcrossFork", "(Ljava/lang/String;)V",
(void *) com_android_internal_os_Zygote_nativeAllowFileAcrossFork },
{ "nativeUnmountStorageOnInit", "()V",
- (void *) com_android_internal_os_Zygote_nativeUnmountStorageOnInit }
+ (void *) com_android_internal_os_Zygote_nativeUnmountStorageOnInit },
+ { "nativeResetNicePriority", "()V",
+ (void *) com_android_internal_os_Zygote_nativeResetNicePriority }
};
int register_com_android_internal_os_Zygote(JNIEnv* env) {