Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Kyle Huey | 624 | 100.00% | 1 | 100.00% |
Total | 624 | 1 |
// SPDX-License-Identifier: GPL-2.0 #define _GNU_SOURCE #include <errno.h> #include <fcntl.h> #include <linux/perf_event.h> #include <stddef.h> #include <sched.h> #include <signal.h> #include <stdlib.h> #include <string.h> #include <sys/ioctl.h> #include <sys/mman.h> #include <sys/syscall.h> #include <sys/wait.h> #include <unistd.h> #include "../kselftest_harness.h" #define __maybe_unused __attribute__((__unused__)) static int sigio_count; static void handle_sigio(int signum __maybe_unused, siginfo_t *oh __maybe_unused, void *uc __maybe_unused) { ++sigio_count; } static void do_child(void) { raise(SIGSTOP); for (int i = 0; i < 20; ++i) sleep(1); raise(SIGSTOP); exit(0); } TEST(watermark_signal) { struct perf_event_attr attr; struct perf_event_mmap_page *p = NULL; struct sigaction previous_sigio, sigio = { 0 }; pid_t child = -1; int child_status; int fd = -1; long page_size = sysconf(_SC_PAGE_SIZE); sigio.sa_sigaction = handle_sigio; EXPECT_EQ(sigaction(SIGIO, &sigio, &previous_sigio), 0); memset(&attr, 0, sizeof(attr)); attr.size = sizeof(attr); attr.type = PERF_TYPE_SOFTWARE; attr.config = PERF_COUNT_SW_DUMMY; attr.sample_period = 1; attr.disabled = 1; attr.watermark = 1; attr.context_switch = 1; attr.wakeup_watermark = 1; child = fork(); EXPECT_GE(child, 0); if (child == 0) do_child(); else if (child < 0) { perror("fork()"); goto cleanup; } if (waitpid(child, &child_status, WSTOPPED) != child || !(WIFSTOPPED(child_status) && WSTOPSIG(child_status) == SIGSTOP)) { fprintf(stderr, "failed to sycnhronize with child errno=%d status=%x\n", errno, child_status); goto cleanup; } fd = syscall(__NR_perf_event_open, &attr, child, -1, -1, PERF_FLAG_FD_CLOEXEC); if (fd < 0) { fprintf(stderr, "failed opening event %llx\n", attr.config); goto cleanup; } if (fcntl(fd, F_SETFL, FASYNC)) { perror("F_SETFL FASYNC"); goto cleanup; } if (fcntl(fd, F_SETOWN, getpid())) { perror("F_SETOWN getpid()"); goto cleanup; } if (fcntl(fd, F_SETSIG, SIGIO)) { perror("F_SETSIG SIGIO"); goto cleanup; } p = mmap(NULL, 2 * page_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); if (p == NULL) { perror("mmap"); goto cleanup; } if (ioctl(fd, PERF_EVENT_IOC_ENABLE, 0)) { perror("PERF_EVENT_IOC_ENABLE"); goto cleanup; } if (kill(child, SIGCONT) < 0) { perror("SIGCONT"); goto cleanup; } if (waitpid(child, &child_status, WSTOPPED) != -1 || errno != EINTR) fprintf(stderr, "expected SIGIO to terminate wait errno=%d status=%x\n%d", errno, child_status, sigio_count); EXPECT_GE(sigio_count, 1); cleanup: if (p != NULL) munmap(p, 2 * page_size); if (fd >= 0) close(fd); if (child > 0) { kill(child, SIGKILL); waitpid(child, NULL, 0); } sigaction(SIGIO, &previous_sigio, NULL); } TEST_HARNESS_MAIN
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