diff --git a/cokernel/smp/x86/bootparam.h b/cokernel/smp/x86/bootparam.h
index c016f9ec..5292afaa 100644
--- a/cokernel/smp/x86/bootparam.h
+++ b/cokernel/smp/x86/bootparam.h
@@ -98,6 +98,9 @@ struct smp_boot_param {
 	unsigned long monitor;
 	unsigned long monitor_size;
 
+	unsigned long rusage;
+	unsigned long rusage_size;
+
 	unsigned long nmi_mode_addr;
 
 	unsigned long dma_address;
diff --git a/cokernel/smp/x86/setup.c b/cokernel/smp/x86/setup.c
index bc3d28c7..7351f2e0 100644
--- a/cokernel/smp/x86/setup.c
+++ b/cokernel/smp/x86/setup.c
@@ -223,6 +223,14 @@ int ihk_set_monitor(unsigned long addr, unsigned long size)
 	return 0;
 }
 
+int ihk_set_rusage(unsigned long addr, unsigned long size)
+{
+	boot_param->rusage = addr;
+	boot_param->rusage_size = size;
+	
+	return 0;
+}
+
 int ihk_set_nmi_mode_addr(unsigned long addr)
 {
 	boot_param->nmi_mode_addr = addr;
diff --git a/linux/core/host_driver.c b/linux/core/host_driver.c
index 4d740aa9..1d129cf1 100644
--- a/linux/core/host_driver.c
+++ b/linux/core/host_driver.c
@@ -606,6 +606,39 @@ setup_monitor(struct ihk_host_linux_os_data *data)
 	data->monitor_len = size;
 }
 
+static void
+setup_rusage(struct ihk_host_linux_os_data *data)
+{
+	unsigned long rpa;
+	unsigned long pa;
+	unsigned long size;
+	unsigned long psize;
+
+	if (data->rusage)
+		return;
+
+	if (__ihk_os_get_special_addr(data, IHK_SPADDR_RUSAGE, &rpa, &size)) {
+		dprintf("get_special_addr: failed.\n");
+		return;
+	}
+
+	psize = ((size + PAGE_SIZE - 1) / PAGE_SIZE) * PAGE_SIZE;
+	pa = __ihk_os_map_memory(data, rpa, psize);
+
+#ifdef CONFIG_MIC
+	if ((long)pa <= 0) {
+		return;
+	}
+
+	data->rusage = ioremap_nocache(pa, psize);
+#else
+	data->rusage = ihk_device_map_virtual(data->dev_data, pa, psize,
+	                                       NULL, 0);
+#endif
+	data->rusage_pa = pa;
+	data->rusage_len = size;
+}
+
 static int __ihk_os_status(struct ihk_host_linux_os_data *data,
 		char __user *buf)
 {
@@ -763,8 +796,7 @@ static int __ihk_os_thaw(struct ihk_host_linux_os_data *data)
 	return error;
 }
 
-static int
-__ihk_os_get_usage(struct ihk_host_linux_os_data *data, unsigned long arg)
+static int __ihk_os_get_usage(struct ihk_host_linux_os_data *data, unsigned long arg)
 {
 	struct ihk_os_monitor *__user buf;
 
@@ -781,8 +813,7 @@ __ihk_os_get_usage(struct ihk_host_linux_os_data *data, unsigned long arg)
 	return 0;
 }
 
-static int
-__ihk_os_get_cpu_usage(struct ihk_host_linux_os_data *data, unsigned long arg)
+static int __ihk_os_get_cpu_usage(struct ihk_host_linux_os_data *data, unsigned long arg)
 {
 	struct ihk_os_cpu_monitor *__user buf;
 	int size;
@@ -1006,7 +1037,6 @@ static long ihk_host_os_ioctl(struct file *file, unsigned int request,
 		dkprintf("__ihk_os_get_cpu_usage  (ret=%d)\n",ret);
 		break;
 
-
 	default:
 		if (request >= IHK_OS_DEBUG_START && 
 		    request <= IHK_OS_DEBUG_END) {
@@ -1975,6 +2005,13 @@ struct ihk_cpu_info *ihk_os_get_cpu_info(ihk_os_t os)
 	return __ihk_os_get_cpu_info(os);
 }
 
+void *ihk_os_get_rusage(ihk_os_t ihk_os)
+{
+	struct ihk_host_linux_os_data *os = ihk_os;
+	setup_rusage(os);
+	return os->rusage;
+}
+
 ihk_device_t ihk_os_to_dev(ihk_os_t os)
 {
 	return ((struct ihk_host_linux_os_data *)os)->dev_data;
@@ -2329,3 +2366,4 @@ EXPORT_SYMBOL(ihk_device_linux_cpu_to_hw_id);
 EXPORT_SYMBOL(ihk_host_register_os_notifier);
 EXPORT_SYMBOL(ihk_host_deregister_os_notifier);
 EXPORT_SYMBOL(ihk_os_eventfd);
+EXPORT_SYMBOL(ihk_os_get_rusage);
diff --git a/linux/core/host_linux.h b/linux/core/host_linux.h
index 2f8ac2f5..77658a42 100644
--- a/linux/core/host_linux.h
+++ b/linux/core/host_linux.h
@@ -79,6 +79,12 @@ struct ihk_host_linux_os_data {
 	/** \brief Host physical address to monitor  */
 	unsigned long monitor_pa;
 
+	void *rusage;
+	/** \brief Size of the rusage */
+	unsigned long rusage_len;
+	/** \brief Host physical address to rusage  */
+	unsigned long rusage_pa;
+
 	/** \brief Flag whether the IKC is already initialized or not */
 	int ikc_initialized;
 	/** \brief Lock for the channel list */
diff --git a/linux/driver/smp/smp-driver.c b/linux/driver/smp/smp-driver.c
index 0e5eea79..2a775af2 100644
--- a/linux/driver/smp/smp-driver.c
+++ b/linux/driver/smp/smp-driver.c
@@ -1181,6 +1181,13 @@ static int smp_ihk_os_get_special_addr(ihk_os_t ihk_os, void *priv,
 			return 0;
 		}
 		break;
+	case IHK_SPADDR_RUSAGE:
+		if (os->param->rusage) {
+			*addr = os->param->rusage;
+			*size = os->param->rusage_size;
+			return 0;
+		}
+		break;
 	case IHK_SPADDR_NMI_MODE:
 		if (os->param->nmi_mode_addr) {
 			*addr = os->param->nmi_mode_addr;
diff --git a/linux/include/ihk/kmsg.h b/linux/include/ihk/ihk_debug.h
similarity index 62%
rename from linux/include/ihk/kmsg.h
rename to linux/include/ihk/ihk_debug.h
index a31c126a..d1abce54 100644
--- a/linux/include/ihk/kmsg.h
+++ b/linux/include/ihk/ihk_debug.h
@@ -1,13 +1,13 @@
 /**
- * \file ihk_OS_KMSG.h
+ * \file ihk_debug.h
  * \brief
  *	IHK-Master: OS status
  * \author Taku Shimosawa  <shimosawa@is.s.u-tokyo.ac.jp> \par
  *	Copyright (C) 2011-2012 Taku Shimosawa <shimosawa@is.s.u-tokyo.ac.jp>
  */
-#ifndef IHK_OS_KMSG_H_INCLUDED
-#define IHK_OS_KMSG_H_INCLUDED
+#ifndef IHK_DEBUG_H_INCLUDED
+#define IHK_DEBUG_H_INCLUDED
 
 #define IHK_KMSG_SIZE      (8*1024)
 
-#endif /* !defined(IHK_OS_KMSG_H_INCLUDED) */
+#endif /* !defined(IHK_DEBUG_H_INCLUDED) */
diff --git a/linux/include/ihk/ihk_host_driver.h b/linux/include/ihk/ihk_host_driver.h
index 50a1244f..a88ab823 100644
--- a/linux/include/ihk/ihk_host_driver.h
+++ b/linux/include/ihk/ihk_host_driver.h
@@ -11,8 +11,8 @@
 
 #include <ihk/archdefs.h>
 #include <ihk/status.h>
-#include <ihk/monitor.h>
-#include <ihk/kmsg.h>
+#include <ihk/ihk_monitor.h>
+#include <ihk/ihk_debug.h>
 
 /** \brief Status of a manycore device */
 enum ihk_cpu_status {
@@ -29,7 +29,8 @@ enum ihk_special_addr_type {
 	IHK_SPADDR_MIKC_QUEUE_RECV = 2,
 	IHK_SPADDR_MIKC_QUEUE_SEND = 3,
 	IHK_SPADDR_MONITOR = 4,
-	IHK_SPADDR_NMI_MODE = 5,
+	IHK_SPADDR_RUSAGE = 5,
+	IHK_SPADDR_NMI_MODE = 6,
 };
 
 /** \brief Type of an IHK device */
@@ -649,6 +650,8 @@ struct ihk_cpu_info {
 struct ihk_mem_info *ihk_os_get_memory_info(ihk_os_t os);
 /** \brief Get information of CPU cores which the OS kernel uses */
 struct ihk_cpu_info *ihk_os_get_cpu_info(ihk_os_t os);
+/** \brief Get address of memory area to which OS-global rerouce usage is recorded */
+void *ihk_os_get_rusage(ihk_os_t os);
 
 /** \brief Denote to allocate all the available cpus */
 #define IHK_RESOURCE_CPU_ALL  -1
diff --git a/linux/include/ihk/ihk_host_user.h b/linux/include/ihk/ihk_host_user.h
index 584cad1f..db5c3c55 100644
--- a/linux/include/ihk/ihk_host_user.h
+++ b/linux/include/ihk/ihk_host_user.h
@@ -11,8 +11,8 @@
 #define __HEADER_IHK_HOST_USER_H
 
 #include <ihk/status.h>
-#include <ihk/monitor.h>
-#include <ihk/kmsg.h>
+#include <ihk/ihk_monitor.h>
+#include <ihk/ihk_debug.h>
 
 #define IHK_DEVICE_CREATE_OS          0x112900
 #define IHK_DEVICE_DESTROY_OS         0x112901
@@ -69,6 +69,7 @@
 #define IHK_OS_AUX_PERF_ENABLE     0x11290103
 #define IHK_OS_AUX_PERF_DISABLE    0x11290104
 #define IHK_OS_AUX_PERF_DESTROY    0x11290105
+#define IHK_OS_GETRUSAGE           0x11290106
 
 #define FLAG_IHK_OS_SHUTDOWN_FORCE    0x40000000
 
diff --git a/linux/include/ihk/ihk_monitor.h b/linux/include/ihk/ihk_monitor.h
new file mode 100644
index 00000000..b3aac18d
--- /dev/null
+++ b/linux/include/ihk/ihk_monitor.h
@@ -0,0 +1,34 @@
+/**
+ * \file ihk_monitor.h
+ * \brief
+ *	IHK-Master: OS status
+ * \author Tomoki Shirasawa  <tomoki.shirasawa.kk@hitachi-solutions.com> \par
+ *	Copyright (C) 2017 Tomoki Shirasawa  <tomoki.shirasawa.kk@hitachi-solutions.com>
+ */
+#ifndef IHK_MONITOR_H_INCLUDED
+#define IHK_MONITOR_H_INCLUDED
+
+/** \brief IHK-Monitor */
+struct ihk_os_cpu_monitor {
+	int status;
+#define IHK_OS_MONITOR_NOT_BOOT 0
+#define IHK_OS_MONITOR_IDLE 1
+#define IHK_OS_MONITOR_USER 2
+#define IHK_OS_MONITOR_KERNEL 3
+#define IHK_OS_MONITOR_KERNEL_HEAVY 4
+#define IHK_OS_MONITOR_KERNEL_OFFLOAD 5
+#define IHK_OS_MONITOR_KERNEL_FREEZING 8
+#define IHK_OS_MONITOR_KERNEL_FROZEN 9
+#define IHK_OS_MONITOR_KERNEL_THAW 10
+#define IHK_OS_MONITOR_PANIC 99
+	int status_bak;
+	unsigned long counter;
+	unsigned long ocounter;
+};
+
+struct ihk_os_monitor {
+	unsigned long num_processors;
+	unsigned long reserve[128];
+	struct ihk_os_cpu_monitor cpu[0]; /* clv[i].monitor = &cpu[i] */
+};
+#endif /* !defined(IHK_MONITOR_H_INCLUDED) */
diff --git a/linux/include/ihk/ihklib_private.h b/linux/include/ihk/ihklib_private.h
new file mode 100644
index 00000000..913692fc
--- /dev/null
+++ b/linux/include/ihk/ihklib_private.h
@@ -0,0 +1,9 @@
+#ifndef IHKLIB_PRIVATE_H_INCLUDED
+#define IHKLIB_PRIVATE_H_INCLUDED
+
+struct getrusage_desc {
+	void* rusage;
+	size_t size_rusage;
+};
+
+#endif /* !defined(IHKLIB_PRIVATE_H_INCLUDED) */
diff --git a/linux/include/ihk/monitor.h b/linux/include/ihk/monitor.h
deleted file mode 100644
index d2c19d26..00000000
--- a/linux/include/ihk/monitor.h
+++ /dev/null
@@ -1,55 +0,0 @@
-/**
- * \file ihk_os_monitor.h
- * \brief
- *	IHK-Master: OS status
- * \author Tomoki Shirasawa  <tomoki.shirasawa.kk@hitachi-solutions.com> \par
- *	Copyright (C) 2017 Tomoki Shirasawa  <tomoki.shirasawa.kk@hitachi-solutions.com>
- */
-#ifndef IHK_OS_MONITOR_H_INCLUDED
-#define IHK_OS_MONITOR_H_INCLUDED
-
-/** \brief IHK-Monitor */
-struct ihk_os_cpu_monitor {
-	int status;
-#define IHK_OS_MONITOR_NOT_BOOT 0
-#define IHK_OS_MONITOR_IDLE 1
-#define IHK_OS_MONITOR_USER 2
-#define IHK_OS_MONITOR_KERNEL 3
-#define IHK_OS_MONITOR_KERNEL_HEAVY 4
-#define IHK_OS_MONITOR_KERNEL_OFFLOAD 5
-#define IHK_OS_MONITOR_KERNEL_FREEZING 8
-#define IHK_OS_MONITOR_KERNEL_FROZEN 9
-#define IHK_OS_MONITOR_KERNEL_THAW 10
-#define IHK_OS_MONITOR_PANIC 99
-	int status_bak;
-	unsigned long counter;
-	unsigned long ocounter;
-	unsigned long user_tsc;
-	unsigned long system_tsc;
-};
-
-#define IHK_MAX_NUM_PGSIZES 4
-#define IHK_MAX_NUM_NUMA_NODES 1024
-#define IHK_MAX_NUMA_CPUS 1024
-
-struct ihk_os_monitor {
-	long rusage_memory_stat_rss[IHK_MAX_NUM_PGSIZES];
-	long rusage_memory_stat_mapped_file[IHK_MAX_NUM_PGSIZES];
-	unsigned long rusage_memory_max_usage;
-	unsigned long rusage_max_num_threads;
-	unsigned long rusage_num_threads;
-	long rusage_rss_current;
-	unsigned long rusage_memory_kmem_usage;
-	unsigned long rusage_memory_kmem_max_usage;
-	unsigned long rusage_memory_numa_stat[IHK_MAX_NUM_NUMA_NODES];
-
-	unsigned long rusage_total_memory;
-	unsigned long rusage_total_memory_usage;
-	unsigned long rusage_total_memory_max_usage;
-	unsigned long num_processors;
-	unsigned long ns_per_tsc;
-	unsigned long reserve[128];
-
-	struct ihk_os_cpu_monitor cpu[0];
-};
-#endif /* !defined(IHK_OS_MONITOR_H_INCLUDED) */
diff --git a/linux/user/ihklib.c b/linux/user/ihklib.c
index aa68c22a..f8d3100d 100644
--- a/linux/user/ihklib.c
+++ b/linux/user/ihklib.c
@@ -1,18 +1,15 @@
 /**
  * \file ihklib.c
  */
-#include <config.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <fcntl.h>
 #include <unistd.h>
 #include <ctype.h>
-#include "ihk/ihk_host_user.h"
 #include <sys/ioctl.h>
 #include <string.h>
 #include <errno.h>
 #include <dirent.h>
-#include "ihklib.h"
 #include <bfd.h>
 #include <inttypes.h>
 #include <time.h>
@@ -25,6 +22,11 @@
 #include <sys/time.h>
 #include <pthread.h>
 
+#include <config.h>
+#include <ihk/ihk_host_user.h>
+#include <ihklib.h>
+#include <ihk/ihklib_private.h>
+
 int __argc;
 char **__argv;
 
@@ -1498,77 +1500,27 @@ int count_numa_node () {
 }
 
 #ifdef ENABLE_RUSAGE
-int ihk_os_getrusage(int index, void *_rusage, size_t size_rusage)
+int ihk_os_getrusage(int index, void *rusage, size_t size_rusage)
 {
+	char fn[128];
+	int ret = 0;
 	int fd;
-	char path[1024];
-	struct ihk_os_monitor monitor;
-	struct ihk_os_cpu_monitor *cpu;
-	struct mckernel_rusage *rusage = (struct mckernel_rusage *)_rusage;
-	int rc;
-	int i;
-	unsigned long ut;
-	unsigned long st;
-
-	sprintf(path, "/dev/mcos%d", index);	
-	if ((fd = open(path, O_RDWR)) == -1) {
-		return -errno;
-	} 
+	struct getrusage_desc desc = { .rusage = rusage, .size_rusage = size_rusage };
 
-	if (ioctl(fd, IHK_OS_GET_USAGE, &monitor) == -1) {
-		rc = -errno;
-		close(fd);
-		return rc;
-	}
-
-	cpu = malloc(sizeof(struct ihk_os_cpu_monitor) *
-	             monitor.num_processors);
-	if (!cpu) {
-		close(fd);
-		return -ENOMEM;
-	}
-
-	if (ioctl(fd, IHK_OS_GET_CPU_USAGE, cpu) == -1) {
-		rc = -errno;
-		close(fd);
-		free(cpu);
-		return rc;
-	}
-
-	memset(rusage, 0, size_rusage);
-
-	for (i = 0; i < IHK_MAX_NUM_PGSIZES; i++) {
-		rusage->memory_stat_rss[i] = monitor.rusage_memory_stat_rss[i];
-		rusage->memory_stat_mapped_file[i] = monitor.rusage_memory_stat_mapped_file[i];
-	}
-	rusage->memory_max_usage = monitor.rusage_memory_max_usage;
-	rusage->memory_kmem_usage = monitor.rusage_memory_kmem_usage;
-	rusage->memory_kmem_max_usage = monitor.rusage_memory_kmem_max_usage;
-	for (i = 0; i < IHK_MAX_NUM_NUMA_NODES; i++) {
-		rusage->memory_numa_stat[i] = monitor.rusage_memory_numa_stat[i];
-	}
-	for (ut = 0, st = 0, i = 0; i < monitor.num_processors; i++) {
-		unsigned long wt;
-
-		wt = cpu[i].user_tsc * monitor.ns_per_tsc / 1000;
-		ut += wt;
-		st += cpu[i].system_tsc * monitor.ns_per_tsc / 1000;
-		rusage->cpuacct_usage_percpu[i] = wt;
-	}
-	rusage->cpuacct_stat_system = st / 10000000;
-	rusage->cpuacct_stat_user = ut / 10000000;
-	rusage->cpuacct_usage = ut;
-
-	rusage->num_threads = monitor.rusage_num_threads;
-	rusage->max_num_threads = monitor.rusage_max_num_threads;
+	sprintf(fn, "/dev/mcos%d", index);
+	fd = open(fn, O_RDONLY);
+	CHKANDJUMP(fd == -1, -ENOENT, "open failed: %s\n", strerror(errno));
+	ret = ioctl(fd, IHK_OS_GETRUSAGE, &desc);
+	CHKANDJUMP(ret != 0, -EINVAL, "ioctl failed,ret=%d\n", ret);
 
-	close(fd);
-	free(cpu);
-	return 0;
+ fn_exit:
+	return ret;
+ fn_fail:
+	goto fn_exit;
 }
 #else
 /* ihk_getrusage */
-int ihk_os_getrusage(int index, void *_rusage, size_t size_rusage)
+int ihk_os_getrusage(int index, void *rusage, size_t size_rusage)
 {
 	eprintf("Specify --enable-rusage when configuring.\n");
 	return -EINVAL;
@@ -1766,3 +1718,4 @@ int ihk_getperfevent (int index, unsigned long *counter, int n)
 	}
 	return ret;
 }
+
diff --git a/linux/user/ihklib.h.in b/linux/user/ihklib.h.in
index 613dac93..62b459ff 100644
--- a/linux/user/ihklib.h.in
+++ b/linux/user/ihklib.h.in
@@ -107,25 +107,6 @@ typedef struct ihk_osinfo {
 	int *ikc_map;
 } ihk_osinfo;
 
-#define IHK_MAX_NUM_PGSIZES 4
-#define IHK_MAX_NUM_NUMA_NODES 1024
-#define IHK_MAX_NUM_CPUS 1024
-
-struct mckernel_rusage {
-	unsigned long memory_stat_rss[IHK_MAX_NUM_PGSIZES];
-	unsigned long memory_stat_mapped_file[IHK_MAX_NUM_PGSIZES];
-	unsigned long memory_max_usage;
-	unsigned long memory_kmem_usage;
-	unsigned long memory_kmem_max_usage;
-	unsigned long memory_numa_stat[IHK_MAX_NUM_NUMA_NODES];
-	unsigned long cpuacct_stat_system;
-	unsigned long cpuacct_stat_user;
-	unsigned long cpuacct_usage;
-	unsigned long cpuacct_usage_percpu[IHK_MAX_NUM_CPUS];
-	int num_threads;
-	int max_num_threads;
-};
-
 typedef struct ihk_perf_event_attr {
 	unsigned long config; 
 	unsigned disabled:1;