if (child_pid > 0)
kill(child_pid, SIGTERM);
- if (signr == -1)
+ if (signr == -1 || signr == SIGUSR1)
return;
signal(signr, SIG_DFL);
atexit(sig_atexit);
signal(SIGCHLD, sig_handler);
signal(SIGINT, sig_handler);
+ signal(SIGUSR1, sig_handler);
if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
perror("failed to create pipes");
execvp(argv[0], (char **)argv);
perror(argv[0]);
+ kill(getppid(), SIGUSR1);
exit(-1);
}
if (err < 0)
err = event__synthesize_kernel_mmap(process_synthesized_event,
session, machine, "_stext");
- if (err < 0) {
- pr_err("Couldn't record kernel reference relocation symbol.\n");
- return err;
- }
+ if (err < 0)
+ pr_err("Couldn't record kernel reference relocation symbol\n"
+ "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
+ "Check /proc/kallsyms permission or run as root.\n");
err = event__synthesize_modules(process_synthesized_event,
session, machine);
- if (err < 0) {
- pr_err("Couldn't record kernel reference relocation symbol.\n");
- return err;
- }
+ if (err < 0)
+ pr_err("Couldn't record kernel module information.\n"
+ "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
+ "Check /proc/modules permission or run as root.\n");
+
if (perf_guest)
perf_session__process_machines(session, event__synthesize_guest_os);
}
}
- if (quiet)
+ if (quiet || signr == SIGUSR1)
return 0;
fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);