/* * Test null syscall performance * * Copyright (C) 2009-2015 Anton Blanchard, IBM * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #define NR_LOOPS 10000000 #include #include #include #include #include #include #include #include static volatile int soak_done; unsigned long long clock_frequency; unsigned long long timebase_frequency; double timebase_multiplier; static inline unsigned long long mftb(void) { unsigned long low; asm volatile("mftb %0" : "=r" (low)); return low; } static void sigalrm_handler(int unused) { soak_done = 1; } /* * Use a timer instead of busy looping on clock_gettime() so we don't * pollute profiles with glibc and VDSO hits. */ static void cpu_soak_usecs(unsigned long usecs) { struct itimerval val; memset(&val, 0, sizeof(val)); val.it_value.tv_usec = usecs; signal(SIGALRM, sigalrm_handler); setitimer(ITIMER_REAL, &val, NULL); while (1) { if (soak_done) break; } signal(SIGALRM, SIG_DFL); } /* * This only works with recent kernels where cpufreq modifies * /proc/cpuinfo dynamically. */ static void get_proc_frequency(void) { FILE *f; char line[128]; char *p, *end; unsigned long v; double d; char *override; /* Try to get out of low power/low frequency mode */ cpu_soak_usecs(0.25 * 1000000); f = fopen("/proc/cpuinfo", "r"); if (f == NULL) return; timebase_frequency = 0; while (fgets(line, sizeof(line), f) != NULL) { if (strncmp(line, "timebase", 8) == 0) { p = strchr(line, ':'); if (p != NULL) { v = strtoull(p + 1, &end, 0); if (end != p + 1) timebase_frequency = v; } } if (((strncmp(line, "clock", 5) == 0) || (strncmp(line, "cpu MHz", 7) == 0))) { p = strchr(line, ':'); if (p != NULL) { d = strtod(p + 1, &end); if (end != p + 1) { /* Find fastest clock frequency */ if ((d * 1000000ULL) > clock_frequency) clock_frequency = d * 1000000ULL; } } } } fclose(f); override = getenv("FREQUENCY"); if (override) clock_frequency = strtoull(override, NULL, 10); if (timebase_frequency) timebase_multiplier = (double)clock_frequency / timebase_frequency; else timebase_multiplier = 1; } static void do_null_syscall(unsigned long nr) { unsigned long i; for (i = 0; i < nr; i++) getppid(); } #define TIME(A, STR) \ int main(void) { unsigned long tb_start, tb_now; struct timespec tv_start, tv_now; unsigned long long elapsed_ns, elapsed_tb; get_proc_frequency(); clock_gettime(CLOCK_MONOTONIC, &tv_start); tb_start = mftb(); do_null_syscall(NR_LOOPS); clock_gettime(CLOCK_MONOTONIC, &tv_now); tb_now = mftb(); elapsed_ns = (tv_now.tv_sec - tv_start.tv_sec) * 1000000000ULL + (tv_now.tv_nsec - tv_start.tv_nsec); elapsed_tb = tb_now - tb_start; printf("%10.2f ns %10.2f cycles\n", (float)elapsed_ns / NR_LOOPS, (float)elapsed_tb * timebase_multiplier / NR_LOOPS); return 0; } .cgi/linux/net-next.git/tree/tools/perf/util?h=nds-private-remove&id=e4178c75049c581114998a850ecdfa5a2811cde6'>util

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