Merge "Add boost to increase the load on newly-forked zygote processes." into mnc-dr-dev (f76806a9) · Commits · e / os / android_frameworks_base

core/jni/Android.mk

+4 −0

Original line number	Diff line number	Diff line
		@@ -20,6 +20,10 @@ ifneq ($(ENABLE_CPUSETS),)
		LOCAL_CFLAGS += -DENABLE_CPUSETS
		endif

		ifneq ($(ENABLE_SCHED_BOOST),)
		LOCAL_CFLAGS += -DENABLE_SCHED_BOOST
		endif

		LOCAL_CFLAGS += -DGL_GLEXT_PROTOTYPES -DEGL_EGLEXT_PROTOTYPES

		LOCAL_CFLAGS += -DU_USING_ICU_NAMESPACE=0

+31 −0

Original line number	Diff line number	Diff line
		@@ -408,6 +408,27 @@ void SetThreadName(const char* thread_name) {
		}
		}

		#ifdef ENABLE_SCHED_BOOST
		static void SetForkLoad(bool boost) {
		// set scheduler knob to boost forked processes
		pid_t currentPid = getpid();
		// fits at most "/proc/XXXXXXX/sched_init_task_load\0"
		char schedPath[35];
		snprintf(schedPath, sizeof(schedPath), "/proc/%u/sched_init_task_load", currentPid);
		int schedBoostFile = open(schedPath, O_WRONLY);
		if (schedBoostFile < 0) {
		ALOGW("Unable to set zygote scheduler boost");
		return;
		}
		if (boost) {
		write(schedBoostFile, "100\0", 4);
		} else {
		write(schedBoostFile, "0\0", 2);
		}
		close(schedBoostFile);
		}
		#endif

		// Utility routine to fork zygote and specialize the child process.
		static pid_t ForkAndSpecializeCommon(JNIEnv* env, uid_t uid, gid_t gid, jintArray javaGids,
		jint debug_flags, jobjectArray javaRlimits,
		@@ -418,6 +439,10 @@ static pid_t ForkAndSpecializeCommon(JNIEnv* env, uid_t uid, gid_t gid, jintArra
		jstring instructionSet, jstring dataDir) {
		SetSigChldHandler();

		#ifdef ENABLE_SCHED_BOOST
		SetForkLoad(true);
		#endif

		pid_t pid = fork();

		if (pid == 0) {
		@@ -558,6 +583,12 @@ static pid_t ForkAndSpecializeCommon(JNIEnv* env, uid_t uid, gid_t gid, jintArra
		}
		} else if (pid > 0) {
		// the parent process

		#ifdef ENABLE_SCHED_BOOST
		// unset scheduler knob
		SetForkLoad(false);
		#endif

		}
		return pid;
		}