am 33b33549: Merge "Make the default cgroup, the foreground cgroup." into lmp-mr1-dev (d1380d64) · Commits · e / os / android_system_core

libcutils/sched_policy.c

+3 −23

Original line number	Diff line number	Diff line
		@@ -45,8 +45,6 @@ static inline SchedPolicy _policy(SchedPolicy p)

		#define POLICY_DEBUG 0

		#define CAN_SET_SP_SYSTEM 0 // non-zero means to implement set_sched_policy(tid, SP_SYSTEM)

		// This prctl is only available in Android kernels.
		#define PR_SET_TIMERSLACK_PID 41

		@@ -60,9 +58,6 @@ static int __sys_supports_schedgroups = -1;
		// File descriptors open to /dev/cpuctl/../tasks, setup by initialize, or -1 on error.
		static int bg_cgroup_fd = -1;
		static int fg_cgroup_fd = -1;
		#if CAN_SET_SP_SYSTEM
		static int system_cgroup_fd = -1;
		#endif

		/* Add tid to the scheduling group defined by the policy */
		static int add_tid_to_cgroup(int tid, SchedPolicy policy)
		@@ -78,11 +73,6 @@ static int add_tid_to_cgroup(int tid, SchedPolicy policy)
		case SP_AUDIO_SYS:
		fd = fg_cgroup_fd;
		break;
		#if CAN_SET_SP_SYSTEM
		case SP_SYSTEM:
		fd = system_cgroup_fd;
		break;
		#endif
		default:
		fd = -1;
		break;
		@@ -123,21 +113,13 @@ static void __initialize(void) {
		if (!access("/dev/cpuctl/tasks", F_OK)) {
		__sys_supports_schedgroups = 1;

		#if CAN_SET_SP_SYSTEM
		filename = "/dev/cpuctl/tasks";
		system_cgroup_fd = open(filename, O_WRONLY \| O_CLOEXEC);
		if (system_cgroup_fd < 0) {
		SLOGV("open of %s failed: %s\n", filename, strerror(errno));
		}
		#endif

		filename = "/dev/cpuctl/apps/tasks";
		fg_cgroup_fd = open(filename, O_WRONLY \| O_CLOEXEC);
		if (fg_cgroup_fd < 0) {
		SLOGE("open of %s failed: %s\n", filename, strerror(errno));
		}

		filename = "/dev/cpuctl/apps/bg_non_interactive/tasks";
		filename = "/dev/cpuctl/bg_non_interactive/tasks";
		bg_cgroup_fd = open(filename, O_WRONLY \| O_CLOEXEC);
		if (bg_cgroup_fd < 0) {
		SLOGE("open of %s failed: %s\n", filename, strerror(errno));
		@@ -231,11 +213,9 @@ int get_sched_policy(int tid, SchedPolicy *policy)
		if (getSchedulerGroup(tid, grpBuf, sizeof(grpBuf)) < 0)
		return -1;
		if (grpBuf[0] == '\0') {
		*policy = SP_SYSTEM;
		} else if (!strcmp(grpBuf, "apps/bg_non_interactive")) {
		*policy = SP_BACKGROUND;
		} else if (!strcmp(grpBuf, "apps")) {
		*policy = SP_FOREGROUND;
		} else if (!strcmp(grpBuf, "bg_non_interactive")) {
		*policy = SP_BACKGROUND;
		} else {
		errno = ERANGE;
		return -1;

rootdir/init.rc

+8 −15

Original line number	Diff line number	Diff line
		@@ -119,25 +119,18 @@ on init
		mount cgroup none /dev/cpuctl cpu
		chown system system /dev/cpuctl
		chown system system /dev/cpuctl/tasks
		chmod 0660 /dev/cpuctl/tasks
		chmod 0666 /dev/cpuctl/tasks
		write /dev/cpuctl/cpu.shares 1024
		write /dev/cpuctl/cpu.rt_runtime_us 950000
		write /dev/cpuctl/cpu.rt_runtime_us 800000
		write /dev/cpuctl/cpu.rt_period_us 1000000

		mkdir /dev/cpuctl/apps
		chown system system /dev/cpuctl/apps/tasks
		chmod 0666 /dev/cpuctl/apps/tasks
		write /dev/cpuctl/apps/cpu.shares 1024
		write /dev/cpuctl/apps/cpu.rt_runtime_us 800000
		write /dev/cpuctl/apps/cpu.rt_period_us 1000000

		mkdir /dev/cpuctl/apps/bg_non_interactive
		chown system system /dev/cpuctl/apps/bg_non_interactive/tasks
		chmod 0666 /dev/cpuctl/apps/bg_non_interactive/tasks
		mkdir /dev/cpuctl/bg_non_interactive
		chown system system /dev/cpuctl/bg_non_interactive/tasks
		chmod 0666 /dev/cpuctl/bg_non_interactive/tasks
		# 5.0 %
		write /dev/cpuctl/apps/bg_non_interactive/cpu.shares 52
		write /dev/cpuctl/apps/bg_non_interactive/cpu.rt_runtime_us 700000
		write /dev/cpuctl/apps/bg_non_interactive/cpu.rt_period_us 1000000
		write /dev/cpuctl/bg_non_interactive/cpu.shares 52
		write /dev/cpuctl/bg_non_interactive/cpu.rt_runtime_us 700000
		write /dev/cpuctl/bg_non_interactive/cpu.rt_period_us 1000000

		# qtaguid will limit access to specific data based on group memberships.
		# net_bw_acct grants impersonation of socket owners.