tests: benchmarks: remove obsolete boot_time test suite

This test for boot time was sufficient when it was originally
introduced, but is no longer appropriate as the code and
ecosystem grew.

Signed-off-by: Jennifer Williams <jennifer.m.williams@intel.com>

tests/benchmarks/boot_time/CMakeLists.txt

@@ -1,13 +0,0 @@
-# SPDX-License-Identifier: Apache-2.0
-
-cmake_minimum_required(VERSION 3.13.1)
-find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
-project(boot_time)
-
-FILE(GLOB app_sources src/*.c)
-target_sources(app PRIVATE ${app_sources})
-
-target_include_directories(app PRIVATE
-  ${ZEPHYR_BASE}/kernel/include
-  ${ZEPHYR_BASE}/arch/${ARCH}/include
-  )

tests/benchmarks/boot_time/README.txt

@@ -1,64 +0,0 @@
-Title: Boot Time Measurement
-
-Description:
-
-BootTime measures the time:
-   a) from system reset to kernel start (crt0.s's __start)
-   b) from kernel start to begin of main()
-   c) from kernel start to begin of first task
-   d) from kernel start to when kernel's main task goes immediately idle
-
-The project can be built using one of the following three configurations:
-
-best
--------
- - Disables most features
- - Provides best case boot measurement
-
-default
--------
- - Default configuration options
- - Provides typical boot measurement
-
-worst
--------
- - Enables most features.
- - Provides worst case boot measurement
-
---------------------------------------------------------------------------------
-
-Building and Running Project:
-
-This benchmark outputs to the console.  It can be built and executed
-on QEMU as follows:
-
-    make run
-
---------------------------------------------------------------------------------
-
-Troubleshooting:
-
-Problems caused by out-dated project information can be addressed by
-issuing one of the following commands then rebuilding the project:
-
-    make clean          # discard results of previous builds
-                        # but keep existing configuration info
-or
-    make pristine       # discard results of previous builds
-                        # and restore pre-defined configuration info
-
---------------------------------------------------------------------------------
-
-Sample Output:
-
-tc_start() - Boot Time Measurement
-Boot Result: Clock Frequency: 25 MHz
-__start       : 88410717 cycles, 3536428 us
-_start->main(): 2422894 cycles, 96915 us
-_start->task  : 2450930 cycles, 98037 us
-_start->idle  : 37503993 cycles, 1500159 us
-Boot Time Measurement finished
-===================================================================
-PASS - main.
-===================================================================
-PROJECT EXECUTION SUCCESSFUL

tests/benchmarks/boot_time/prj.conf

@@ -1,7 +0,0 @@
-CONFIG_TEST=y
-CONFIG_BOOT_TIME_MEASUREMENT=y
-CONFIG_TEST_RANDOM_GENERATOR=y
-CONFIG_FORCE_NO_ASSERT=y
-CONFIG_TEST_HW_STACK_PROTECTION=n
-# Disable HW Stack Protection (see #28664)
-CONFIG_HW_STACK_PROTECTION=n

tests/benchmarks/boot_time/src/main.c

@@ -1,59 +0,0 @@
-/*
- * Copyright (c) 2013-2015 Wind River Systems, Inc.
- * Copyright (c) 2016 Intel Corporation.
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-/**
- * @file
- * @brief Measure boot time
- *
- * Measuring the boot time
- *  1. From __start to main()
- *  2. From __start to task
- *  3. From __start to idle
- */
-
-#include <zephyr.h>
-#include <tc_util.h>
-#include <kernel_internal.h>
-
-void main(void)
-{
-	uint32_t task_time_stamp;	/* timestamp at beginning of first task */
-	uint32_t main_us;		/* begin of main timestamp in us */
-	uint32_t task_us;		/* begin of task timestamp in us */
-	uint32_t idle_us;		/* begin of idle timestamp in us */
-
-	task_time_stamp = k_cycle_get_32();
-
-	/*
-	 * Go to sleep for 1 tick in order to timestamp when idle thread halts.
-	 */
-	k_sleep(K_MSEC(1));
-
-	main_us = (uint32_t)ceiling_fraction(USEC_PER_SEC *
-					  (uint64_t)z_timestamp_main,
-					  sys_clock_hw_cycles_per_sec());
-	task_us = (uint32_t)ceiling_fraction(USEC_PER_SEC *
-					  (uint64_t)task_time_stamp,
-					  sys_clock_hw_cycles_per_sec());
-	idle_us = (uint32_t)ceiling_fraction(USEC_PER_SEC *
-					  (uint64_t)z_timestamp_idle,
-					  sys_clock_hw_cycles_per_sec());
-
-	TC_START("Boot Time Measurement");
-	TC_PRINT("Boot Result: Clock Frequency: %d Hz\n",
-					  sys_clock_hw_cycles_per_sec());
-	TC_PRINT("_start->main(): %u cycles, %u us\n", z_timestamp_main,
-						       main_us);
-	TC_PRINT("_start->task  : %u cycles, %u us\n", task_time_stamp,
-						       task_us);
-	TC_PRINT("_start->idle  : %u cycles, %u us\n", z_timestamp_idle,
-						       idle_us);
-	TC_PRINT("Boot Time Measurement finished\n");
-
-	TC_END_RESULT(TC_PASS);
-	TC_END_REPORT(TC_PASS);
-}

tests/benchmarks/boot_time/testcase.yaml

@@ -1,7 +0,0 @@
-tests:
-  benchmark.kernel.boot_time:
-    arch_allow: x86 arm posix
-    platform_exclude: qemu_x86 qemu_x86_coverage qemu_x86_64 qemu_x86_nommu
-      minnowboard acrn acrn_ehl_crb
-    tags: benchmark
-    filter: CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC >= 1000000