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Cpuidle wakeup latencies are determined for IPIs and can help determine any deviations from what is advertsied by the hardware. A baseline measurement for each case of IPIs is taken at 100 percent CPU usage to quantify for the kernel-userpsace overhead during execution. Signed-off-by: Pratik Rajesh Sampat --- tools/testing/selftests/Makefile | 1 + tools/testing/selftests/cpuidle/Makefile | 7 + tools/testing/selftests/cpuidle/cpuidle.c | 479 ++++++++++++++++++++++ tools/testing/selftests/cpuidle/settings | 1 + 4 files changed, 488 insertions(+) create mode 100644 tools/testing/selftests/cpuidle/Makefile create mode 100644 tools/testing/selftests/cpuidle/cpuidle.c create mode 100644 tools/testing/selftests/cpuidle/settings diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile index 9018f45d631d..2bb0e87f76fd 100644 --- a/tools/testing/selftests/Makefile +++ b/tools/testing/selftests/Makefile @@ -8,6 +8,7 @@ TARGETS += cgroup TARGETS += clone3 TARGETS += core TARGETS += cpufreq +TARGETS += cpuidle TARGETS += cpu-hotplug TARGETS += drivers/dma-buf TARGETS += efivarfs diff --git a/tools/testing/selftests/cpuidle/Makefile b/tools/testing/selftests/cpuidle/Makefile new file mode 100644 index 000000000000..d332485e1bc5 --- /dev/null +++ b/tools/testing/selftests/cpuidle/Makefile @@ -0,0 +1,7 @@ +# SPDX-License-Identifier: GPL-2.0 +TEST_GEN_PROGS := cpuidle + +CFLAGS += -O2 +LDLIBS += -lpthread + +include ../lib.mk diff --git a/tools/testing/selftests/cpuidle/cpuidle.c b/tools/testing/selftests/cpuidle/cpuidle.c new file mode 100644 index 000000000000..b2f6a0e655b8 --- /dev/null +++ b/tools/testing/selftests/cpuidle/cpuidle.c @@ -0,0 +1,479 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Cpuidle latency measurement microbenchmark + * + * A mechanism to measure wakeup latency for IPI based interrupts. Results of + * this microbenchmark can be used to check and validate against the + * advertised latencies for each cpuidle state + * + * IPIs (using pipes) are used to wake the CPU up and measure the + * time difference + * + * Baseline measurements on 100 busy load are used to account for the + * kernel-userspace overhead + * + * Usage: + * ./cpuidle --mode --output + * + * Copyright (C) 2020 Pratik Rajesh Sampat , IBM + */ + +#define _GNU_SOURCE +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define READ 0 +#define WRITE 1 + +static int pipe_fd[2]; +static int *cpu_list; +static int cpus; +static int idle_states; +static uint64_t *latency_list; + +static char *log_file = "cpuidle.log"; + +static int get_online_cpus(int *online_cpu_list, int total_cpus) +{ + char filename[80]; + int i, index = 0; + FILE *fptr; + + for (i = 0; i < total_cpus; i++) { + char status; + + sprintf(filename, "/sys/devices/system/cpu/cpu"); + sprintf(filename + strlen(filename), "%d%s", i, "/online"); + fptr = fopen(filename, "r"); + if (!fptr) + continue; + assert(fscanf(fptr, "%c", &status) != EOF); + if (status == '1') + online_cpu_list[index++] = i; + fclose(fptr); + } + return index; +} + +static uint64_t us_to_ns(uint64_t val) +{ + return val * 1000; +} + +static void get_latency(int cpu) +{ + char filename[80]; + uint64_t latency; + FILE *fptr; + int state; + + for (state = 0; state < idle_states; state++) { + sprintf(filename, "%s%d%s%d%s", "/sys/devices/system/cpu/cpu", + cpu, "/cpuidle/state", + state, "/latency"); + fptr = fopen(filename, "r"); + assert(fptr); + + assert(fscanf(fptr, "%ld", &latency) != EOF); + latency_list[state] = latency; + fclose(fptr); + } +} + +static int get_idle_state_count(int cpu) +{ + struct dirent *entry; + int dir_count = 0; + char filename[80]; + DIR *dirp; + + sprintf(filename, "%s%d%s", "/sys/devices/system/cpu/cpu", + cpu, "/cpuidle"); + + dirp = opendir(filename); + if (!dirp) + return -1; + while (entry = readdir(dirp)) { + if (entry->d_type == DT_DIR) { + if (strcmp(entry->d_name, ".") == 0 || + strcmp(entry->d_name, "..") == 0) + continue; + dir_count++; + } + } + closedir(dirp); + return dir_count; +} + +/* Enable or disable all idle states */ +static int state_all_idle(char *disable) +{ + char filename[80]; + FILE *fptr; + int i, j; + + for (i = 0; i < cpus; i++) { + for (j = 0; j < idle_states; j++) { + sprintf(filename, "%s%d%s%d%s", + "/sys/devices/system/cpu/cpu", cpu_list[i], + "/cpuidle/state", j, "/disable"); + fptr = fopen(filename, "w"); + assert(fptr); + fprintf(fptr, "%s", disable); + fclose(fptr); + } + } + return 0; +} + +/* Disable all idle states */ +static int cpuidle_disable_all_states(void) +{ + return state_all_idle("1"); +} + +static int cpuidle_enable_all_states(void) +{ + return state_all_idle("0"); +} + +static int state_operation(char *disable, int state) +{ + char filename[80]; + FILE *fptr; + int i; + + for (i = 0; i < cpus; i++) { + sprintf(filename, "%s%d%s%d%s", "/sys/devices/system/cpu/cpu", + cpu_list[i], "/cpuidle/state", state, "/disable"); + fptr = fopen(filename, "w"); + assert(fptr); + fprintf(fptr, "%s", disable); + fclose(fptr); + } + return 0; +} + +static int cpuidle_enable_state(int state) +{ + return state_operation("0", state); +} + +static int cpuidle_disable_state(int state) +{ + return state_operation("1", state); +} + +static uint64_t average(uint64_t *arr, int size) +{ + int i, sum = 0; + + assert(size != 0); + for (i = 0; i < size; i++) + sum += arr[i]; + return sum / size; +} + +static pthread_t start_thread_on(void *(*fn)(void *), void *arg, uint64_t cpu) +{ + pthread_attr_t attr; + cpu_set_t cpuset; + pthread_t tid; + int rc; + + CPU_ZERO(&cpuset); + CPU_SET(cpu, &cpuset); + + rc = pthread_attr_init(&attr); + if (rc) { + perror("pthread_attr_init"); + exit(1); + } + + rc = pthread_attr_setaffinity_np(&attr, sizeof(cpu_set_t), &cpuset); + if (rc) { + perror("pthread_attr_setaffinity_np"); + exit(1); + } + + rc = pthread_create(&tid, &attr, fn, arg); + if (rc) { + perror("pthread_create"); + exit(1); + } + return tid; +} + +void *util_full_cpu(void *unused) +{ + FILE *fptr; + + fptr = fopen("/dev/null", "w"); + assert(fptr); + while (1) { + fprintf(fptr, "0"); + nanosleep((const struct timespec[]){{0, 10L}}, NULL); + } + fclose(fptr); +} + +/* IPI based wakeup latencies */ +struct latency { + unsigned int src_cpu; + unsigned int dest_cpu; + struct timespec time_start; + struct timespec time_end; + uint64_t latency_ns; +} ipi_wakeup; + +static void *writer(void *unused) +{ + signed char c = 'P'; + + assert(write(pipe_fd[WRITE], &c, 1) == 1); + ipi_wakeup.src_cpu = sched_getcpu(); + + return NULL; +} + +static void *reader(void *unused) +{ + signed char c; + + assert(read(pipe_fd[READ], &c, 1) == 1); + ipi_wakeup.dest_cpu = sched_getcpu(); + + return NULL; +} + +static void ipi_test_once(int baseline, int src_cpu, int dest_cpu) +{ + pthread_t tid, tid1, baseline_tid; + + if (baseline) { + baseline_tid = start_thread_on(util_full_cpu, NULL, dest_cpu); + /* Run process for long enough to gain 100% usage*/ + sleep(2); + } + + clock_gettime(CLOCK_REALTIME, &ipi_wakeup.time_start); + + tid = start_thread_on(writer, NULL, src_cpu); + pthread_join(tid, NULL); + tid1 = start_thread_on(reader, NULL, dest_cpu); + pthread_join(tid1, NULL); + + clock_gettime(CLOCK_REALTIME, &ipi_wakeup.time_end); + ipi_wakeup.latency_ns = (ipi_wakeup.time_end.tv_sec - + ipi_wakeup.time_start.tv_sec) * 1000000000ULL + + ipi_wakeup.time_end.tv_nsec - ipi_wakeup.time_start.tv_nsec; + + if (baseline) + pthread_cancel(baseline_tid); +} + +static void ipi_test(int src_cpu) +{ + uint64_t avg_arr[cpus], avg_latency; + int cpu, state; + FILE *fptr; + + assert(cpuidle_disable_all_states() == 0); + + if (pipe(pipe_fd)) + exit(1); + + fptr = fopen(log_file, "a"); + fprintf(fptr, "----IPI TEST----\n"); + + fprintf(fptr, "----Baseline IPI Latency----\n"); + fprintf(fptr, "%s %10s %18s\n", "SRC_CPU", "DEST_CPU", + "Baseline_latency(ns)"); + /* Run the test as dummy once to stablize */ + ipi_test_once(1, src_cpu, cpu_list[0]); + for (cpu = 0; cpu < cpus; cpu++) { + ipi_test_once(1, src_cpu, cpu_list[cpu]); + fprintf(fptr, "%3d %10d %12ld\n", ipi_wakeup.src_cpu, + ipi_wakeup.dest_cpu, + ipi_wakeup.latency_ns); + avg_arr[cpu] = ipi_wakeup.latency_ns; + } + avg_latency = average(avg_arr, cpus); + fprintf(fptr, "Baseline average IPI latency(ns): %ld\n\n", avg_latency); + + for (state = 0; state < idle_states; state++) { + fprintf(fptr, "--Enabling state: %d--\n", state); + assert(cpuidle_enable_state(state) == 0); + fprintf(fptr, "%s %10s %18s\n", "SRC_CPU", "DEST_CPU", + "IPI_Latency(ns)"); + for (cpu = 0; cpu < cpus; cpu++) { + /* Allow sufficient cycles to go idle */ + sleep(1); + ipi_test_once(0, src_cpu, cpu_list[cpu]); + fprintf(fptr, "%3d %10d %18ld\n", ipi_wakeup.src_cpu, + ipi_wakeup.dest_cpu, + ipi_wakeup.latency_ns); + avg_arr[cpu] = ipi_wakeup.latency_ns; + } + fprintf(fptr, "Expected Latency(ns): %ld\n", + us_to_ns(latency_list[state])); + avg_latency = average(avg_arr, cpus); + fprintf(fptr, "Observed Average IPI latency(ns): %ld\n\n", + avg_latency); + assert(cpuidle_disable_state(state) == 0); + } + + assert(cpuidle_enable_all_states() == 0); + fclose(fptr); +} + +static struct option options[] = { + {"output", required_argument, 0, 'o'}, + {"mode", required_argument, 0, 'm'}, +}; + +static void usage(void) +{ + fprintf(stderr, "Usage: cpuidle \n\n"); + fprintf(stderr, "\t\t--mode=X\t(quick / full / )\n"); + fprintf(stderr, "\t\t--output=X\tOutput loc (def: cpuidle.log)\n\n"); +} + +void get_n_random_cpus(int *shf_list, int shf_size, int *list, int n) +{ + /* Shuffle the Online CPU list */ + int i; + int shuffle_index_list[shf_size]; + + for (i = 0; i < shf_size; i++) + shuffle_index_list[i] = i; + for (i = 0; i < shf_size; i++) { + int idx = i + rand() % (shf_size - i); + int temp = shuffle_index_list[i]; + + shuffle_index_list[i] = shuffle_index_list[idx]; + shuffle_index_list[idx] = temp; + } + + /* Pick the first n from the shf_list elements */ + for (i = 0; i < n; i++) + list[i] = shf_list[shuffle_index_list[i]]; +} + +int main(int argc, char *argv[]) +{ + int total_cpus, online_cpus, option_index = 0; + int *online_cpu_list; + signed char c; + FILE *fptr; + + if (getuid()) { + fprintf(stderr, "cpuidle latency test must run as root\n"); + exit(1); + } + + total_cpus = sysconf(_SC_NPROCESSORS_ONLN); + online_cpu_list = malloc(total_cpus * sizeof(int)); + if (!online_cpu_list) { + perror("Malloc failure"); + exit(1); + } + + online_cpus = get_online_cpus(&online_cpu_list[0], total_cpus); + if (!online_cpus) { + perror("Unable to get online CPUS"); + exit(1); + } + + /* Get one CPU for a quick test */ + cpus = 1; + cpu_list = malloc(1 * sizeof(int)); + srand(time(NULL)); + cpu_list[0] = online_cpu_list[(rand() % online_cpus) + 1]; + + while (1) { + c = getopt_long(argc, argv, "", options, &option_index); + if (c == -1) + break; + + switch (c) { + case 'o': + log_file = optarg; + break; + case 'm': + if (!strcmp(optarg, "full")) { + cpu_list = realloc(cpu_list, + online_cpus * sizeof(int)); + memcpy(cpu_list, online_cpu_list, + online_cpus * sizeof(int)); + cpus = online_cpus; + } else if (strcmp(optarg, "quick")) { + int opt_cpus; + + opt_cpus = atoi(optarg); + if (!opt_cpus) { + fprintf(stderr, "Error parsing mode\n"); + usage(); + exit(1); + } + if (opt_cpus > online_cpus) { + fprintf(stderr, "Number of CPUS > Online CPUs\n"); + usage(); + exit(1); + } + cpu_list = realloc(cpu_list, + opt_cpus * sizeof(int)); + get_n_random_cpus(online_cpu_list, online_cpus, + &cpu_list[0], opt_cpus); + cpus = opt_cpus; + } + break; + default: + usage(); + exit(1); + } + } + + idle_states = get_idle_state_count(online_cpu_list[0]); + if (idle_states == -1) { + perror("Unable to get idle states"); + exit(1); + } + + fptr = fopen(log_file, "w+"); + fprintf(fptr, "cpuidle latency selftests. IPI & Timers\n"); + fprintf(fptr, "Number of CPUS: %d\n", total_cpus); + fprintf(fptr, "Number of idle states: %d\n", idle_states); + fclose(fptr); + + latency_list = malloc(idle_states * sizeof(uint64_t)); + if (!latency_list) { + perror("Malloc failure"); + exit(1); + } + + get_latency(online_cpu_list[0]); + + ipi_test(online_cpu_list[0]); + printf("IPI test done\n"); + fflush(stdout); + + printf("Output logged at: %s\n", log_file); + + free(latency_list); + free(cpu_list); + free(online_cpu_list); + return 0; +} diff --git a/tools/testing/selftests/cpuidle/settings b/tools/testing/selftests/cpuidle/settings new file mode 100644 index 000000000000..e7b9417537fb --- /dev/null +++ b/tools/testing/selftests/cpuidle/settings @@ -0,0 +1 @@ +timeout=0 -- 2.26.2