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-rw-r--r--usr.sbin/pmcstat/pmcstat.c728
1 files changed, 728 insertions, 0 deletions
diff --git a/usr.sbin/pmcstat/pmcstat.c b/usr.sbin/pmcstat/pmcstat.c
new file mode 100644
index 0000000..8dc09dc
--- /dev/null
+++ b/usr.sbin/pmcstat/pmcstat.c
@@ -0,0 +1,728 @@
+/*-
+ * Copyright (c) 2003,2004 Joseph Koshy
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/event.h>
+#include <sys/queue.h>
+#include <sys/time.h>
+#include <sys/ttycom.h>
+#include <sys/wait.h>
+
+#include <assert.h>
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <math.h>
+#include <pmc.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sysexits.h>
+#include <unistd.h>
+
+/* Operation modes */
+
+#define FLAG_HAS_PID 0x00000001
+#define FLAG_HAS_WAIT_INTERVAL 0x00000002
+#define FLAG_HAS_LOG_FILE 0x00000004
+#define FLAG_HAS_PROCESS 0x00000008
+#define FLAG_USING_SAMPLING 0x00000010
+#define FLAG_USING_COUNTING 0x00000020
+#define FLAG_USING_PROCESS_PMC 0x00000040
+
+#define DEFAULT_SAMPLE_COUNT 65536
+#define DEFAULT_WAIT_INTERVAL 5.0
+#define DEFAULT_DISPLAY_HEIGHT 23
+#define DEFAULT_LOGFILE_NAME "pmcstat.out"
+
+#define PRINT_HEADER_PREFIX "# "
+#define READPIPEFD 0
+#define WRITEPIPEFD 1
+#define NPIPEFD 2
+
+struct pmcstat_ev {
+ STAILQ_ENTRY(pmcstat_ev) ev_next;
+ char *ev_spec; /* event specification */
+ char *ev_name; /* (derived) event name */
+ enum pmc_mode ev_mode; /* desired mode */
+ int ev_count; /* associated count if in sampling mode */
+ int ev_cpu; /* specific cpu if requested */
+ int ev_descendants; /* attach to descendants */
+ int ev_cumulative; /* show cumulative counts */
+ int ev_fieldwidth; /* print width */
+ int ev_fieldskip; /* #leading spaces */
+ pmc_value_t ev_saved; /* saved value for incremental counts */
+ pmc_id_t ev_pmcid; /* allocated ID */
+};
+
+struct pmcstat_args {
+ int pa_flags;
+ pid_t pa_pid;
+ FILE *pa_outputfile;
+ FILE *pa_logfile;
+ double pa_interval;
+ int pa_argc;
+ char **pa_argv;
+ STAILQ_HEAD(, pmcstat_ev) pa_head;
+} args;
+
+int pmcstat_interrupt = 0;
+int pmcstat_displayheight = DEFAULT_DISPLAY_HEIGHT;
+int pmcstat_pipefd[NPIPEFD];
+int pmcstat_kq;
+
+/* Function prototypes */
+void pmcstat_cleanup(struct pmcstat_args *_a);
+void pmcstat_print_counters(struct pmcstat_args *_a);
+void pmcstat_print_headers(struct pmcstat_args *_a);
+void pmcstat_print_pmcs(struct pmcstat_args *_a);
+void pmcstat_setup_process(struct pmcstat_args *_a);
+void pmcstat_show_usage(void);
+void pmcstat_start_pmcs(struct pmcstat_args *_a);
+void pmcstat_start_process(struct pmcstat_args *_a);
+
+
+/*
+ * cleanup
+ */
+
+void
+pmcstat_cleanup(struct pmcstat_args *a)
+{
+ struct pmcstat_ev *ev, *tmp;
+
+ /* de-configure the log file if present. */
+ if (a->pa_flags & FLAG_USING_SAMPLING) {
+ (void) pmc_configure_logfile(-1);
+ (void) fclose(a->pa_logfile);
+ }
+
+ /* release allocated PMCs. */
+ STAILQ_FOREACH_SAFE(ev, &a->pa_head, ev_next, tmp)
+ if (ev->ev_pmcid != PMC_ID_INVALID) {
+ if (pmc_release(ev->ev_pmcid) < 0)
+ err(EX_OSERR, "ERROR: cannot release pmc "
+ "%d \"%s\"", ev->ev_pmcid, ev->ev_name);
+ free(ev->ev_name);
+ free(ev->ev_spec);
+ STAILQ_REMOVE(&a->pa_head, ev, pmcstat_ev, ev_next);
+ free(ev);
+ }
+}
+
+void
+pmcstat_start_pmcs(struct pmcstat_args *a)
+{
+ struct pmcstat_ev *ev;
+
+ STAILQ_FOREACH(ev, &args.pa_head, ev_next) {
+
+ assert(ev->ev_pmcid != PMC_ID_INVALID);
+
+ if (pmc_start(ev->ev_pmcid) < 0) {
+ warn("ERROR: Cannot start pmc %d \"%s\"",
+ ev->ev_pmcid, ev->ev_name);
+ pmcstat_cleanup(a);
+ }
+ }
+
+}
+
+void
+pmcstat_print_headers(struct pmcstat_args *a)
+{
+ struct pmcstat_ev *ev;
+ int c;
+
+ (void) fprintf(a->pa_outputfile, PRINT_HEADER_PREFIX);
+
+ STAILQ_FOREACH(ev, &a->pa_head, ev_next) {
+ if (PMC_IS_SAMPLING_MODE(ev->ev_mode))
+ continue;
+
+ c = PMC_IS_SYSTEM_MODE(ev->ev_mode) ? 's' : 'p';
+
+ if (ev->ev_fieldskip != 0) {
+ (void) fprintf(a->pa_outputfile, "%*s%c/%*s ",
+ ev->ev_fieldskip, "", c,
+ ev->ev_fieldwidth - ev->ev_fieldskip - 2,
+ ev->ev_name);
+ } else
+ (void) fprintf(a->pa_outputfile, "%c/%*s ",
+ c, ev->ev_fieldwidth - 2, ev->ev_name);
+ }
+
+ (void) fflush(a->pa_outputfile);
+}
+
+void
+pmcstat_print_counters(struct pmcstat_args *a)
+{
+ int extra_width;
+ struct pmcstat_ev *ev;
+ pmc_value_t value;
+
+ extra_width = sizeof(PRINT_HEADER_PREFIX) - 1;
+
+ STAILQ_FOREACH(ev, &a->pa_head, ev_next) {
+
+ /* skip sampling mode counters */
+ if (PMC_IS_SAMPLING_MODE(ev->ev_mode))
+ continue;
+
+ if (pmc_read(ev->ev_pmcid, &value) < 0)
+ err(EX_OSERR, "ERROR: Cannot read pmc "
+ "\"%s\"", ev->ev_name);
+
+ (void) fprintf(a->pa_outputfile, "%*ju ",
+ ev->ev_fieldwidth + extra_width, (uintmax_t)
+ ev->ev_cumulative ? value : (value - ev->ev_saved));
+ if (ev->ev_cumulative == 0)
+ ev->ev_saved = value;
+ extra_width = 0;
+ }
+
+ (void) fflush(a->pa_outputfile);
+}
+
+/*
+ * Print output
+ */
+
+void
+pmcstat_print_pmcs(struct pmcstat_args *a)
+{
+ static int linecount = 0;
+
+ if (++linecount > pmcstat_displayheight) {
+ (void) fprintf(a->pa_outputfile, "\n");
+ linecount = 1;
+ }
+
+ if (linecount == 1)
+ pmcstat_print_headers(a);
+
+ (void) fprintf(a->pa_outputfile, "\n");
+ pmcstat_print_counters(a);
+
+ return;
+}
+
+/*
+ * Do process profiling
+ *
+ * If a pid was specified, attach each allocated PMC to the target
+ * process. Otherwise, fork a child and attach the PMCs to the child,
+ * and have the child exec() the target program.
+ */
+
+void
+pmcstat_setup_process(struct pmcstat_args *a)
+{
+ char token;
+ struct pmcstat_ev *ev;
+ struct kevent kev;
+
+ if (a->pa_flags & FLAG_HAS_PID) {
+
+ STAILQ_FOREACH(ev, &args.pa_head, ev_next)
+ if (pmc_attach(ev->ev_pmcid, a->pa_pid) != 0)
+ err(EX_OSERR, "ERROR: cannot attach pmc \"%s\" to "
+ "process %d", ev->ev_name, (int) a->pa_pid);
+
+ } else {
+
+ /*
+ * We need to fork a new process and startup the child
+ * using execvp(). Before doing the exec() the child
+ * process reads its pipe for a token so that the parent
+ * can finish doing its pmc_attach() calls.
+ */
+
+ if (pipe(pmcstat_pipefd) < 0)
+ err(EX_OSERR, "ERROR: cannot create pipe");
+
+ switch (a->pa_pid = fork()) {
+ case -1:
+ err(EX_OSERR, "ERROR: cannot fork");
+ /*NOTREACHED*/
+
+ case 0: /* child */
+
+ /* wait for our parent to signal us */
+ (void) close(pmcstat_pipefd[WRITEPIPEFD]);
+ if (read(pmcstat_pipefd[READPIPEFD], &token, 1) < 0)
+ err(EX_OSERR, "ERROR (child): cannot read "
+ "token");
+ (void) close(pmcstat_pipefd[READPIPEFD]);
+
+ /* exec() the program requested */
+ execvp(*args.pa_argv, args.pa_argv);
+ err(EX_OSERR, "ERROR (child): execvp failed");
+ /*NOTREACHED*/
+
+ default: /* parent */
+
+ (void) close(pmcstat_pipefd[READPIPEFD]);
+
+ /* attach all our PMCs to the child */
+ STAILQ_FOREACH(ev, &args.pa_head, ev_next)
+ if (PMC_IS_VIRTUAL_MODE(ev->ev_mode) &&
+ pmc_attach(ev->ev_pmcid, a->pa_pid) != 0)
+ err(EX_OSERR, "ERROR: cannot attach pmc "
+ "\"%s\" to process %d", ev->ev_name,
+ (int) a->pa_pid);
+
+ }
+ }
+
+ /* Ask to be notified via a kevent when the child exits */
+ EV_SET(&kev, a->pa_pid, EVFILT_PROC, EV_ADD, NOTE_EXIT, 0, 0);
+
+ if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0)
+ err(EX_OSERR, "ERROR: cannot monitor process %d",
+ a->pa_pid);
+
+ return;
+}
+
+void
+pmcstat_start_process(struct pmcstat_args *a)
+{
+
+ /* nothing to do: target is already running */
+ if (a->pa_flags & FLAG_HAS_PID)
+ return;
+
+ /* write token to child to state that we are ready */
+ if (write(pmcstat_pipefd[WRITEPIPEFD], "+", 1) != 1)
+ err(EX_OSERR, "ERROR: write failed");
+
+ (void) close(pmcstat_pipefd[WRITEPIPEFD]);
+}
+
+void
+pmcstat_show_usage(void)
+{
+ errx(EX_USAGE,
+ "[options] [commandline]\n"
+ "\t Measure process and/or system performance using hardware\n"
+ "\t performance monitoring counters.\n"
+ "\t Options include:\n"
+ "\t -C\t\t toggle showing cumulative counts\n"
+ "\t -O file\t set sampling log file to \"file\"\n"
+ "\t -P spec\t allocate process-private sampling PMC\n"
+ "\t -S spec\t allocate system-wide sampling PMC\n"
+ "\t -c cpu\t\t set default cpu\n"
+ "\t -d\t\t toggle tracking descendants\n"
+ "\t -n rate\t set sampling rate\n"
+ "\t -o file\t send print output to \"file\"\n"
+ "\t -p spec\t allocate process-private counting PMC\n"
+ "\t -s spec\t allocate system-wide counting PMC\n"
+ "\t -t pid\t attach to running process with pid \"pid\"\n"
+ "\t -w secs\t set printing time interval"
+ );
+}
+
+/*
+ * Main
+ */
+
+int
+main(int argc, char **argv)
+{
+ double interval;
+ int option, npmc, ncpu;
+ int c, current_cpu, current_sampling_count;
+ int running;
+ int do_descendants, use_cumulative_counts;
+ pid_t pid;
+ char *end;
+ struct pmcstat_ev *ev;
+ struct pmc_op_getpmcinfo *ppmci;
+ struct sigaction sa;
+ struct kevent kev;
+ struct winsize ws;
+
+ current_cpu = 0;
+ current_sampling_count = DEFAULT_SAMPLE_COUNT;
+ do_descendants = 0;
+ use_cumulative_counts = 0;
+ args.pa_flags = 0;
+ args.pa_pid = (pid_t) -1;
+ args.pa_logfile = NULL;
+ args.pa_outputfile = stderr;
+ args.pa_interval = DEFAULT_WAIT_INTERVAL;
+ STAILQ_INIT(&args.pa_head);
+
+ ev = NULL;
+
+ while ((option = getopt(argc, argv, "CO:P:S:c:dn:o:p:s:t:w:")) != -1)
+ switch (option) {
+ case 'C': /* cumulative values */
+ use_cumulative_counts = !use_cumulative_counts;
+ break;
+
+ case 'c': /* CPU */
+ current_cpu = strtol(optarg, &end, 0);
+ if (*end != '\0' || current_cpu < 0)
+ errx(EX_USAGE,
+ "ERROR: Illegal CPU number \"%s\"",
+ optarg);
+
+ break;
+
+ case 'd': /* toggle descendents */
+ do_descendants = !do_descendants;
+ break;
+
+ case 'p': /* process virtual counting PMC */
+ case 's': /* system-wide counting PMC */
+ case 'P': /* process virtual sampling PMC */
+ case 'S': /* system-wide sampling PMC */
+ if ((ev = malloc(sizeof(*ev))) == NULL)
+ errx(EX_SOFTWARE, "ERROR: Out of memory");
+
+ switch (option) {
+ case 'p': ev->ev_mode = PMC_MODE_TC; break;
+ case 's': ev->ev_mode = PMC_MODE_SC; break;
+ case 'P': ev->ev_mode = PMC_MODE_TS; break;
+ case 'S': ev->ev_mode = PMC_MODE_SS; break;
+ }
+
+ if (option == 'P' || option == 'p')
+ args.pa_flags |= FLAG_USING_PROCESS_PMC;
+
+ if (option == 'P' || option == 'S')
+ args.pa_flags |= FLAG_USING_SAMPLING;
+
+ if (option == 'p' || option == 's')
+ args.pa_flags |= FLAG_USING_COUNTING;
+
+ ev->ev_spec = strdup(optarg);
+
+ if (option == 'S' || option == 'P')
+ ev->ev_count = current_sampling_count;
+ else
+ ev->ev_count = -1;
+
+ if (option == 'S' || option == 's')
+ ev->ev_cpu = current_cpu;
+ else
+ ev->ev_cpu = PMC_CPU_ANY;
+
+ ev->ev_descendants = do_descendants;
+ ev->ev_cumulative = use_cumulative_counts;
+
+ ev->ev_saved = 0LL;
+ ev->ev_pmcid = PMC_ID_INVALID;
+
+ /* extract event name */
+ c = strcspn(optarg, ", \t");
+ ev->ev_name = malloc(c + 1);
+ (void) strncpy(ev->ev_name, optarg, c);
+ *(ev->ev_name + c) = '\0';
+
+ STAILQ_INSERT_TAIL(&args.pa_head, ev, ev_next);
+
+ break;
+
+ case 'n': /* sampling count */
+ current_sampling_count = strtol(optarg, &end, 0);
+ if (*end != '\0' || current_sampling_count <= 0)
+ errx(EX_USAGE,
+ "ERROR: Illegal count value \"%s\"",
+ optarg);
+ break;
+
+ case 'o': /* outputfile */
+ if (args.pa_outputfile != NULL)
+ (void) fclose(args.pa_outputfile);
+
+ if ((args.pa_outputfile = fopen(optarg, "w")) == NULL)
+ errx(EX_OSERR, "ERROR: cannot open \"%s\" for "
+ "writing", optarg);
+
+ case 'O': /* sampling output */
+ if (args.pa_logfile != NULL)
+ (void) fclose(args.pa_logfile);
+
+ if ((args.pa_logfile = fopen(optarg, "w")) == NULL)
+ errx(EX_OSERR, "ERROR: cannot open \"%s\" for "
+ "writing", optarg);
+ break;
+
+ case 't': /* target pid */
+ pid = strtol(optarg, &end, 0);
+ if (*end != '\0' || pid <= 0)
+ errx(EX_USAGE, "ERROR: Illegal pid value "
+ "\"%s\"", optarg);
+
+ args.pa_flags |= FLAG_HAS_PID;
+ args.pa_pid = pid;
+
+ break;
+
+ case 'w': /* wait interval */
+ interval = strtod(optarg, &end);
+ if (*end != '\0' || interval <= 0)
+ errx(EX_USAGE, "ERROR: Illegal wait interval "
+ "value \"%s\"", optarg);
+ args.pa_flags |= FLAG_HAS_WAIT_INTERVAL;
+ args.pa_interval = interval;
+
+ break;
+
+ case '?':
+ default:
+ pmcstat_show_usage();
+ break;
+
+ }
+
+ args.pa_argc = (argc -= optind);
+ args.pa_argv = (argv += optind);
+
+ if (argc)
+ args.pa_flags |= FLAG_HAS_PROCESS;
+
+ /*
+ * Check invocation syntax.
+ */
+
+ if (STAILQ_EMPTY(&args.pa_head)) {
+ warnx("ERROR: At least one PMC event must be specified");
+ pmcstat_show_usage();
+ }
+
+ if (argc == 0) {
+ if (args.pa_pid == -1) {
+ if (args.pa_flags & FLAG_USING_PROCESS_PMC)
+ errx(EX_USAGE, "ERROR: the -P or -p options "
+ "require a target process");
+ } else if ((args.pa_flags & FLAG_USING_PROCESS_PMC) == 0)
+ errx(EX_USAGE,
+ "ERROR: option -t requires a process-mode pmc "
+ "specification");
+ } else if (args.pa_pid != -1)
+ errx(EX_USAGE,
+ "ERROR: option -t cannot be specified with a command "
+ "name");
+
+ if (pmc_init() < 0)
+ err(EX_UNAVAILABLE,
+ "ERROR: Initialization of the pmc(3) library failed");
+
+ if ((ncpu = pmc_ncpu()) < 0)
+ err(EX_OSERR, "ERROR: Cannot determine the number CPUs "
+ "on the system");
+
+ if ((npmc = pmc_npmc(0)) < 0) /* assume all CPUs are identical */
+ err(EX_OSERR, "ERROR: Cannot determine the number of PMCs "
+ "on CPU %d", 0);
+
+ /*
+ * Allocate PMCs.
+ */
+
+ if (pmc_pmcinfo(0, &ppmci) < 0)
+ err(EX_OSERR, "ERROR: cannot retrieve pmc information");
+
+ assert(ppmci != NULL);
+
+ STAILQ_FOREACH(ev, &args.pa_head, ev_next)
+ if (pmc_allocate(ev->ev_spec, ev->ev_mode,
+ (ev->ev_descendants ? PMC_F_DESCENDANTS : 0),
+ ev->ev_cpu, &ev->ev_pmcid) < 0)
+ err(EX_OSERR, "ERROR: Cannot allocate %s-mode pmc with "
+ "specification \"%s\"",
+ PMC_IS_SYSTEM_MODE(ev->ev_mode) ? "system" : "process",
+ ev->ev_spec);
+
+ /* compute printout widths */
+ STAILQ_FOREACH(ev, &args.pa_head, ev_next) {
+ int pmc_width;
+ int pmc_display_width;
+ int pmc_header_width;
+
+ pmc_width = ppmci->pm_pmcs[ev->ev_pmcid].pm_width;
+ pmc_header_width = strlen(ev->ev_name) + 2; /* prefix '%c|' */
+ pmc_display_width = (int) floor(pmc_width / 3.32193) + 1;
+
+ if (pmc_header_width > pmc_display_width) {
+ ev->ev_fieldskip = 0;
+ ev->ev_fieldwidth = pmc_header_width;
+ } else {
+ ev->ev_fieldskip = pmc_display_width -
+ pmc_header_width;
+ ev->ev_fieldwidth = pmc_display_width;
+ }
+ }
+
+ /* Allocate a kqueue */
+ if ((pmcstat_kq = kqueue()) < 0)
+ err(EX_OSERR, "ERROR: Cannot allocate kqueue");
+
+ /*
+ * If our output is being set to a terminal, register a handler
+ * for window size changes.
+ */
+
+ if (isatty(fileno(args.pa_outputfile))) {
+
+ if (ioctl(fileno(args.pa_outputfile), TIOCGWINSZ, &ws) < 0)
+ err(EX_OSERR, "ERROR: Cannot determine window size");
+
+ pmcstat_displayheight = ws.ws_row - 1;
+
+ EV_SET(&kev, SIGWINCH, EVFILT_SIGNAL, EV_ADD, 0, 0, NULL);
+
+ if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0)
+ err(EX_OSERR, "ERROR: Cannot register kevent for "
+ "SIGWINCH");
+ }
+
+ EV_SET(&kev, SIGINT, EVFILT_SIGNAL, EV_ADD, 0, 0, NULL);
+
+ if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0)
+ err(EX_OSERR, "ERROR: Cannot register kevent for SIGINT");
+
+ if (args.pa_flags & FLAG_USING_SAMPLING) {
+
+ /*
+ * configure log file
+ */
+
+ if (args.pa_logfile == NULL)
+ if ((args.pa_logfile =
+ fopen(DEFAULT_LOGFILE_NAME, "w")) == NULL)
+ err(EX_CANTCREAT, "ERROR: Cannot open sampling "
+ "log file \"%s\"", DEFAULT_LOGFILE_NAME);
+
+ if (pmc_configure_logfile(fileno(args.pa_logfile)) < 0)
+ err(EX_OSERR, "ERROR: Cannot configure sampling "
+ "log");
+
+ STAILQ_FOREACH(ev, &args.pa_head, ev_next)
+ if (PMC_IS_SAMPLING_MODE(ev->ev_mode) &&
+ pmc_set(ev->ev_pmcid, ev->ev_count) < 0)
+ err(EX_OSERR, "ERROR: Cannot set sampling count "
+ "for PMC \"%s\"", ev->ev_name);
+ }
+
+ /* setup a timer for any counting mode PMCs */
+ if (args.pa_flags & FLAG_USING_COUNTING) {
+ EV_SET(&kev, 0, EVFILT_TIMER, EV_ADD, 0,
+ args.pa_interval * 1000, NULL);
+
+ if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0)
+ err(EX_OSERR, "ERROR: Cannot register kevent for "
+ "timer");
+ }
+
+ /* attach PMCs to the target process, starting it if specified */
+ if (args.pa_flags & FLAG_HAS_PROCESS)
+ pmcstat_setup_process(&args);
+
+ /* start the pmcs */
+ pmcstat_start_pmcs(&args);
+
+ /* start the (commandline) process if needed */
+ if (args.pa_flags & FLAG_HAS_PROCESS)
+ pmcstat_start_process(&args);
+
+ /* Handle SIGINT using the kqueue loop */
+ sa.sa_handler = SIG_IGN;
+ sa.sa_flags = 0;
+ (void) sigemptyset(&sa.sa_mask);
+
+ if (sigaction(SIGINT, &sa, NULL) < 0)
+ err(EX_OSERR, "ERROR: Cannot install signal handler");
+
+ /*
+ * loop till either the target process (if any) exits, or we
+ * are killed by a SIGINT.
+ */
+
+ running = 1;
+ do {
+ if ((c = kevent(pmcstat_kq, NULL, 0, &kev, 1, NULL)) <= 0) {
+ if (errno != EINTR)
+ err(EX_OSERR, "ERROR: kevent failed");
+ else
+ continue;
+ }
+
+ if (kev.flags & EV_ERROR)
+ errc(EX_OSERR, kev.data, "ERROR: kevent failed");
+
+ switch (kev.filter) {
+ case EVFILT_PROC: /* target process exited */
+ running = 0;
+ /* FALLTHROUGH */
+
+ case EVFILT_TIMER: /* print out counting PMCs */
+ pmcstat_print_pmcs(&args);
+
+ if (running == 0) /* final newline */
+ (void) fprintf(args.pa_outputfile, "\n");
+ break;
+
+ case EVFILT_SIGNAL:
+ if (kev.ident == SIGINT) {
+ /* pass the signal on to the child process */
+ if ((args.pa_flags & FLAG_HAS_PROCESS) &&
+ (args.pa_flags & FLAG_HAS_PID) == 0)
+ if (kill(args.pa_pid, SIGINT) != 0)
+ err(EX_OSERR, "cannot kill "
+ "child");
+ running = 0;
+ } else if (kev.ident == SIGWINCH) {
+ if (ioctl(fileno(args.pa_outputfile),
+ TIOCGWINSZ, &ws) < 0)
+ err(EX_OSERR, "ERROR: Cannot determine "
+ "window size");
+ pmcstat_displayheight = ws.ws_row - 1;
+ } else
+ assert(0);
+
+ break;
+ }
+
+ } while (running);
+
+ pmcstat_cleanup(&args);
+
+ return 0;
+}
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