diff --git a/kernel/nanokernel/Makefile b/kernel/nanokernel/Makefile
index 879de3a13a1..12a05a56fe4 100644
--- a/kernel/nanokernel/Makefile
+++ b/kernel/nanokernel/Makefile
@@ -11,6 +11,5 @@ obj-y = nano_fiber.o nano_lifo.o \
 
 obj-$(CONFIG_STACK_CANARIES) += compiler_stack_protect.o
 obj-$(CONFIG_INT_LATENCY_BENCHMARK) += int_latency_bench.o
-obj-$(CONFIG_PERFORMANCE_METRICS) += nanometrics.o
 obj-$(CONFIG_ADVANCED_POWER_MANAGEMENT) += idle.o
 obj-$(CONFIG_NANO_TIMERS) += nano_timer.o
diff --git a/kernel/nanokernel/nano_init.c b/kernel/nanokernel/nano_init.c
index 1f06e40cbb2..d90270013a5 100644
--- a/kernel/nanokernel/nano_init.c
+++ b/kernel/nanokernel/nano_init.c
@@ -63,6 +63,14 @@ const char * const build_timestamp = BUILD_TIMESTAMP;
 #define PRINT_BOOT_BANNER() printk(BOOT_BANNER " %s\n", build_timestamp)
 #endif
 
+/* boot time measurement items */
+
+#ifdef CONFIG_BOOT_TIME_MEASUREMENT
+uint64_t __noinit __start_tsc; /* timestamp when kernel starts */
+uint64_t __noinit __main_tsc;  /* timestamp when main() starts */
+uint64_t __noinit __idle_tsc;  /* timestamp when CPU goes idle */
+#endif
+
 /* random number generator items */
 #if defined(CONFIG_TEST_RANDOM_GENERATOR) || \
 	defined(CONFIG_CUSTOM_RANDOM_GENERATOR)
diff --git a/kernel/nanokernel/nanometrics.c b/kernel/nanokernel/nanometrics.c
deleted file mode 100644
index 807bf133e4a..00000000000
--- a/kernel/nanokernel/nanometrics.c
+++ /dev/null
@@ -1,42 +0,0 @@
-/* nanometrics.c - nanokernel performance metrics */
-
-/*
- * Copyright (c) 2012-2014 Wind River Systems, Inc.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1) Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- *
- * 2) Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
- *
- * 3) Neither the name of Wind River Systems nor the names of its contributors
- * may be used to endorse or promote products derived from this software without
- * specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include <nanok.h>
-#include <toolchain.h>
-#include <sections.h>
-
-#ifdef CONFIG_BOOT_TIME_MEASUREMENT
-uint64_t __noinit __start_tsc; /* timestamp when kernel starts */
-uint64_t __noinit __main_tsc;  /* timestamp when main() starts */
-uint64_t __noinit __idle_tsc;  /* timestamp when CPU goes idle */
-#endif
-