diff options
| -rw-r--r-- | core/jni/Android.mk | 4 | ||||
| -rw-r--r-- | core/jni/com_android_internal_os_Zygote.cpp | 31 |
2 files changed, 35 insertions, 0 deletions
diff --git a/core/jni/Android.mk b/core/jni/Android.mk index 5e5450e95371..2af92c7afbb9 100644 --- a/core/jni/Android.mk +++ b/core/jni/Android.mk @@ -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 diff --git a/core/jni/com_android_internal_os_Zygote.cpp b/core/jni/com_android_internal_os_Zygote.cpp index db88962efccc..dbf63b5d87f1 100644 --- a/core/jni/com_android_internal_os_Zygote.cpp +++ b/core/jni/com_android_internal_os_Zygote.cpp @@ -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; } |