Merge "Fix the reset of boosted zygote thread priority." am: 83aceea07d (4c618d89) · Commits · e / os / android_frameworks_base

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

+12 −0

Original line number	Diff line number	Diff line
		@@ -100,6 +100,8 @@ public final class Zygote {
		int[][] rlimits, int mountExternal, String seInfo, String niceName, int[] fdsToClose,
		int[] fdsToIgnore, String instructionSet, String appDataDir) {
		VM_HOOKS.preFork();
		// Resets nice priority for zygote process.
		resetNicePriority();
		int pid = nativeForkAndSpecialize(
		uid, gid, gids, debugFlags, rlimits, mountExternal, seInfo, niceName, fdsToClose,
		fdsToIgnore, instructionSet, appDataDir);
		@@ -144,6 +146,8 @@ public final class Zygote {
		public static int forkSystemServer(int uid, int gid, int[] gids, int debugFlags,
		int[][] rlimits, long permittedCapabilities, long effectiveCapabilities) {
		VM_HOOKS.preFork();
		// Resets nice priority for zygote process.
		resetNicePriority();
		int pid = nativeForkSystemServer(
		uid, gid, gids, debugFlags, rlimits, permittedCapabilities, effectiveCapabilities);
		// Enable tracing as soon as we enter the system_server.
		@@ -173,6 +177,14 @@ public final class Zygote {
		VM_HOOKS.postForkChild(debugFlags, isSystemServer, instructionSet);
		}

		/**
		* Resets the calling thread priority to the default value (Thread.NORM_PRIORITY
		* or nice value 0). This updates both the priority value in java.lang.Thread and
		* the nice value (setpriority).
		*/
		static void resetNicePriority() {
		Thread.currentThread().setPriority(Thread.NORM_PRIORITY);
		}

		/**
		* Executes "/system/bin/sh -c <command>" using the exec() system call.

+0 −20

Original line number	Diff line number	Diff line
		@@ -155,24 +155,6 @@ static void SetSigChldHandler() {
		}
		}

		// Resets nice priority for zygote process. Zygote priority can be set
		// to high value during boot phase to speed it up. We want to ensure
		// zygote is running at normal priority before childs are forked from it.
		//
		// This ends up being called repeatedly before each fork(), but there's
		// no real harm in that.
		static void ResetNicePriority(JNIEnv* env) {
		errno = 0;
		int prio = getpriority(PRIO_PROCESS, 0);
		if (prio == -1 && errno != 0) {
		ALOGW("getpriority failed: %s\n", strerror(errno));
		}
		if (prio != 0 && setpriority(PRIO_PROCESS, 0, 0) != 0) {
		ALOGE("setpriority(%d, 0, 0) failed: %s", PRIO_PROCESS, strerror(errno));
		RuntimeAbort(env, __LINE__, "setpriority failed");
		}
		}

		// Sets the SIGCHLD handler back to default behavior in zygote children.
		static void UnsetSigChldHandler() {
		struct sigaction sa;
		@@ -526,8 +508,6 @@ static pid_t ForkAndSpecializeCommon(JNIEnv* env, uid_t uid, gid_t gid, jintArra
		RuntimeAbort(env, __LINE__, "Unable to restat file descriptor table.");
		}

		ResetNicePriority(env);

		pid_t pid = fork();

		if (pid == 0) {