/* * Copyright 2014, Michael Ellerman, IBM Corp. * Licensed under GPLv2. */ #include <stdbool.h> #include <stdio.h> #include <stdlib.h> #include <signal.h> #include "ebb.h" /* * Test running multiple EBB using processes at once on a single CPU. They * should all run happily without interfering with each other. */ static bool child_should_exit; static void sigint_handler(int signal) { child_should_exit = true; } struct sigaction sigint_action = { .sa_handler = sigint_handler, }; static int cycles_child(void) { struct event event; if (sigaction(SIGINT, &sigint_action, NULL)) { perror("sigaction"); return 1; } event_init_named(&event, 0x1001e, "cycles"); event_leader_ebb_init(&event); event.attr.exclude_kernel = 1; event.attr.exclude_hv = 1; event.attr.exclude_idle = 1; FAIL_IF(event_open(&event)); ebb_enable_pmc_counting(1); setup_ebb_handler(standard_ebb_callee); ebb_global_enable(); FAIL_IF(ebb_event_enable(&event)); mtspr(SPRN_PMC1, pmc_sample_period(sample_period)); while (!child_should_exit) { FAIL_IF(core_busy_loop()); FAIL_IF(ebb_check_mmcr0()); } ebb_global_disable(); ebb_freeze_pmcs(); count_pmc(1, sample_period); dump_summary_ebb_state(); event_close(&event); FAIL_IF(ebb_state.stats.ebb_count == 0); return 0; } #define NR_CHILDREN 4 int multi_ebb_procs(void) { pid_t pids[NR_CHILDREN]; int cpu, rc, i; SKIP_IF(!ebb_is_supported()); cpu = pick_online_cpu(); FAIL_IF(cpu < 0); FAIL_IF(bind_to_cpu(cpu)); for (i = 0; i < NR_CHILDREN; i++) { pids[i] = fork(); if (pids[i] == 0) exit(cycles_child()); } /* Have them all run for "a while" */ sleep(10); rc = 0; for (i = 0; i < NR_CHILDREN; i++) { /* Tell them to stop */ kill(pids[i], SIGINT); /* And wait */ rc |= wait_for_child(pids[i]); } return rc; } int main(void) { return test_harness(multi_ebb_procs, "multi_ebb_procs"); }