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Commit b49996d8 authored by Narayan Kamath's avatar Narayan Kamath
Browse files

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
parent 027d72eb

core/java/com/android/internal/os/Zygote.java

+4 −0
Original line number Diff line number Diff line
@@ -173,6 +173,10 @@ public final class Zygote { 
        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.

core/java/com/android/internal/os/ZygoteInit.java

+2 −0
Original line number Diff line number Diff line
@@ -712,6 +712,8 @@ public class ZygoteInit { 
                EventLog.writeEvent(LOG_BOOT_PROGRESS_PRELOAD_END,

                    SystemClock.uptimeMillis());

                bootTimingsTraceLog.traceEnd(); // ZygotePreload

            } else {

                Zygote.nativeResetNicePriority();

            }



            // Finish profiling the zygote initialization.

core/jni/com_android_internal_os_Zygote.cpp

+7 −1
Original line number Diff line number Diff line
@@ -806,6 +806,10 @@ static void com_android_internal_os_Zygote_nativeUnmountStorageOnInit(JNIEnv* en 
    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 @@ static const JNINativeMethod gMethods[] = { 
    { "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) {