2 * Copyright (c) 2003-2008, Joseph Koshy
3 * Copyright (c) 2007 The FreeBSD Foundation
6 * Portions of this software were developed by A. Joseph Koshy under
7 * sponsorship from the FreeBSD Foundation and Google, Inc.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
34 #include <sys/param.h>
35 #include <sys/cpuset.h>
36 #include <sys/event.h>
37 #include <sys/queue.h>
38 #include <sys/socket.h>
40 #include <sys/sysctl.h>
42 #include <sys/ttycom.h>
70 * A given invocation of pmcstat(8) can manage multiple PMCs of both
71 * the system-wide and per-process variety. Each of these could be in
72 * 'counting mode' or in 'sampling mode'.
74 * For 'counting mode' PMCs, pmcstat(8) will periodically issue a
75 * pmc_read() at the configured time interval and print out the value
76 * of the requested PMCs.
78 * For 'sampling mode' PMCs it can log to a file for offline analysis,
79 * or can analyse sampling data "on the fly", either by converting
80 * samples to printed textual form or by creating gprof(1) compatible
81 * profiles, one per program executed. When creating gprof(1)
82 * profiles it can optionally merge entries from multiple processes
83 * for a given executable into a single profile file.
85 * pmcstat(8) can also execute a command line and attach PMCs to the
86 * resulting child process. The protocol used is as follows:
88 * - parent creates a socketpair for two way communication and
94 * - Wait for childs token.
96 * - Awaits signal to start.
97 * - Attaches PMCs to the child's pid
98 * and starts them. Sets up
99 * monitoring for the child.
100 * - Signals child to start.
101 * - Receives signal, attempts exec().
103 * After this point normal processing can happen.
108 int pmcstat_displayheight = DEFAULT_DISPLAY_HEIGHT;
109 int pmcstat_displaywidth = DEFAULT_DISPLAY_WIDTH;
110 static int pmcstat_sockpair[NSOCKPAIRFD];
111 static int pmcstat_kq;
112 static kvm_t *pmcstat_kvm;
113 static struct kinfo_proc *pmcstat_plist;
114 struct pmcstat_args args;
117 pmcstat_clone_event_descriptor(struct pmcstat_ev *ev, const cpuset_t *cpumask)
120 struct pmcstat_ev *ev_clone;
122 mcpu = sizeof(*cpumask) * NBBY;
123 for (cpu = 0; cpu < mcpu; cpu++) {
124 if (!CPU_ISSET(cpu, cpumask))
127 if ((ev_clone = malloc(sizeof(*ev_clone))) == NULL)
128 errx(EX_SOFTWARE, "ERROR: Out of memory");
129 (void) memset(ev_clone, 0, sizeof(*ev_clone));
131 ev_clone->ev_count = ev->ev_count;
132 ev_clone->ev_cpu = cpu;
133 ev_clone->ev_cumulative = ev->ev_cumulative;
134 ev_clone->ev_flags = ev->ev_flags;
135 ev_clone->ev_mode = ev->ev_mode;
136 ev_clone->ev_name = strdup(ev->ev_name);
137 ev_clone->ev_pmcid = ev->ev_pmcid;
138 ev_clone->ev_saved = ev->ev_saved;
139 ev_clone->ev_spec = strdup(ev->ev_spec);
141 STAILQ_INSERT_TAIL(&args.pa_events, ev_clone, ev_next);
146 pmcstat_get_cpumask(const char *cpuspec, cpuset_t *cpumask)
156 cpu = strtol(s, &end, 0);
157 if (cpu < 0 || end == s)
159 "ERROR: Illegal CPU specification \"%s\".",
161 CPU_SET(cpu, cpumask);
162 s = end + strspn(end, ", \t");
167 pmcstat_attach_pmcs(void)
169 struct pmcstat_ev *ev;
170 struct pmcstat_target *pt;
173 /* Attach all process PMCs to target processes. */
175 STAILQ_FOREACH(ev, &args.pa_events, ev_next) {
176 if (PMC_IS_SYSTEM_MODE(ev->ev_mode))
178 SLIST_FOREACH(pt, &args.pa_targets, pt_next)
179 if (pmc_attach(ev->ev_pmcid, pt->pt_pid) == 0)
181 else if (errno != ESRCH)
183 "ERROR: cannot attach pmc \"%s\" to process %d",
184 ev->ev_name, (int)pt->pt_pid);
188 errx(EX_DATAERR, "ERROR: No processes were attached to.");
193 pmcstat_cleanup(void)
195 struct pmcstat_ev *ev, *tmp;
197 /* release allocated PMCs. */
198 STAILQ_FOREACH_SAFE(ev, &args.pa_events, ev_next, tmp)
199 if (ev->ev_pmcid != PMC_ID_INVALID) {
200 if (pmc_stop(ev->ev_pmcid) < 0)
201 err(EX_OSERR, "ERROR: cannot stop pmc 0x%x \"%s\"",
202 ev->ev_pmcid, ev->ev_name);
203 if (pmc_release(ev->ev_pmcid) < 0)
204 err(EX_OSERR, "ERROR: cannot release pmc 0x%x \"%s\"",
205 ev->ev_pmcid, ev->ev_name);
208 STAILQ_REMOVE(&args.pa_events, ev, pmcstat_ev, ev_next);
212 /* de-configure the log file if present. */
213 if (args.pa_flags & (FLAG_HAS_PIPE | FLAG_HAS_OUTPUT_LOGFILE))
214 (void) pmc_configure_logfile(-1);
216 if (args.pa_logparser) {
217 pmclog_close(args.pa_logparser);
218 args.pa_logparser = NULL;
221 pmcstat_shutdown_logging();
225 pmcstat_create_process(void)
230 struct pmcstat_target *pt;
232 if (socketpair(AF_UNIX, SOCK_STREAM, 0, pmcstat_sockpair) < 0)
233 err(EX_OSERR, "ERROR: cannot create socket pair");
235 switch (pid = fork()) {
237 err(EX_OSERR, "ERROR: cannot fork");
241 (void) close(pmcstat_sockpair[PARENTSOCKET]);
243 /* Write a token to tell our parent we've started executing. */
244 if (write(pmcstat_sockpair[CHILDSOCKET], "+", 1) != 1)
245 err(EX_OSERR, "ERROR (child): cannot write token");
247 /* Wait for our parent to signal us to start. */
248 if (read(pmcstat_sockpair[CHILDSOCKET], &token, 1) < 0)
249 err(EX_OSERR, "ERROR (child): cannot read token");
250 (void) close(pmcstat_sockpair[CHILDSOCKET]);
252 /* exec() the program requested */
253 execvp(*args.pa_argv, args.pa_argv);
254 /* and if that fails, notify the parent */
255 kill(getppid(), SIGCHLD);
256 err(EX_OSERR, "ERROR: execvp \"%s\" failed", *args.pa_argv);
259 default: /* parent */
260 (void) close(pmcstat_sockpair[CHILDSOCKET]);
264 /* Ask to be notified via a kevent when the target process exits. */
265 EV_SET(&kev, pid, EVFILT_PROC, EV_ADD|EV_ONESHOT, NOTE_EXIT, 0,
267 if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0)
268 err(EX_OSERR, "ERROR: cannot monitor child process %d", pid);
270 if ((pt = malloc(sizeof(*pt))) == NULL)
271 errx(EX_SOFTWARE, "ERROR: Out of memory.");
274 SLIST_INSERT_HEAD(&args.pa_targets, pt, pt_next);
276 /* Wait for the child to signal that its ready to go. */
277 if (read(pmcstat_sockpair[PARENTSOCKET], &token, 1) < 0)
278 err(EX_OSERR, "ERROR (parent): cannot read token");
284 pmcstat_find_targets(const char *spec)
286 int n, nproc, pid, rv;
287 struct pmcstat_target *pt;
288 char errbuf[_POSIX2_LINE_MAX], *end;
289 static struct kinfo_proc *kp;
293 /* First check if we've been given a process id. */
294 pid = strtol(spec, &end, 0);
295 if (end != spec && pid >= 0) {
296 if ((pt = malloc(sizeof(*pt))) == NULL)
299 SLIST_INSERT_HEAD(&args.pa_targets, pt, pt_next);
303 /* Otherwise treat arg as a regular expression naming processes. */
304 if (pmcstat_kvm == NULL) {
305 if ((pmcstat_kvm = kvm_openfiles(NULL, "/dev/null", NULL, 0,
307 err(EX_OSERR, "ERROR: Cannot open kernel \"%s\"",
309 if ((pmcstat_plist = kvm_getprocs(pmcstat_kvm, KERN_PROC_PROC,
311 err(EX_OSERR, "ERROR: Cannot get process list: %s",
312 kvm_geterr(pmcstat_kvm));
316 if ((rv = regcomp(®, spec, REG_EXTENDED|REG_NOSUB)) != 0) {
317 regerror(rv, ®, errbuf, sizeof(errbuf));
318 err(EX_DATAERR, "ERROR: Failed to compile regex \"%s\": %s",
322 for (n = 0, kp = pmcstat_plist; n < nproc; n++, kp++) {
323 if ((rv = regexec(®, kp->ki_comm, 1, ®match, 0)) == 0) {
324 if ((pt = malloc(sizeof(*pt))) == NULL)
326 pt->pt_pid = kp->ki_pid;
327 SLIST_INSERT_HEAD(&args.pa_targets, pt, pt_next);
328 } else if (rv != REG_NOMATCH) {
329 regerror(rv, ®, errbuf, sizeof(errbuf));
330 errx(EX_SOFTWARE, "ERROR: Regex evalation failed: %s",
340 errx(EX_SOFTWARE, "Out of memory.");
345 pmcstat_kill_process(void)
347 struct pmcstat_target *pt;
349 assert(args.pa_flags & FLAG_HAS_COMMANDLINE);
352 * If a command line was specified, it would be the very first
353 * in the list, before any other processes specified by -t.
355 pt = SLIST_FIRST(&args.pa_targets);
358 if (kill(pt->pt_pid, SIGINT) != 0)
359 err(EX_OSERR, "ERROR: cannot signal child process");
363 pmcstat_start_pmcs(void)
365 struct pmcstat_ev *ev;
367 STAILQ_FOREACH(ev, &args.pa_events, ev_next) {
369 assert(ev->ev_pmcid != PMC_ID_INVALID);
371 if (pmc_start(ev->ev_pmcid) < 0) {
372 warn("ERROR: Cannot start pmc 0x%x \"%s\"",
373 ev->ev_pmcid, ev->ev_name);
382 pmcstat_print_headers(void)
384 struct pmcstat_ev *ev;
387 (void) fprintf(args.pa_printfile, PRINT_HEADER_PREFIX);
389 STAILQ_FOREACH(ev, &args.pa_events, ev_next) {
390 if (PMC_IS_SAMPLING_MODE(ev->ev_mode))
393 c = PMC_IS_SYSTEM_MODE(ev->ev_mode) ? 's' : 'p';
395 if (ev->ev_fieldskip != 0)
396 (void) fprintf(args.pa_printfile, "%*s",
397 ev->ev_fieldskip, "");
398 w = ev->ev_fieldwidth - ev->ev_fieldskip - 2;
401 (void) fprintf(args.pa_printfile, "s/%02d/%-*s ",
402 ev->ev_cpu, w-3, ev->ev_name);
404 (void) fprintf(args.pa_printfile, "p/%*s ", w,
408 (void) fflush(args.pa_printfile);
412 pmcstat_print_counters(void)
415 struct pmcstat_ev *ev;
418 extra_width = sizeof(PRINT_HEADER_PREFIX) - 1;
420 STAILQ_FOREACH(ev, &args.pa_events, ev_next) {
422 /* skip sampling mode counters */
423 if (PMC_IS_SAMPLING_MODE(ev->ev_mode))
426 if (pmc_read(ev->ev_pmcid, &value) < 0)
427 err(EX_OSERR, "ERROR: Cannot read pmc \"%s\"",
430 (void) fprintf(args.pa_printfile, "%*ju ",
431 ev->ev_fieldwidth + extra_width,
432 (uintmax_t) ev->ev_cumulative ? value :
433 (value - ev->ev_saved));
435 if (ev->ev_cumulative == 0)
436 ev->ev_saved = value;
440 (void) fflush(args.pa_printfile);
448 pmcstat_print_pmcs(void)
450 static int linecount = 0;
452 /* check if we need to print a header line */
453 if (++linecount > pmcstat_displayheight) {
454 (void) fprintf(args.pa_printfile, "\n");
458 pmcstat_print_headers();
459 (void) fprintf(args.pa_printfile, "\n");
461 pmcstat_print_counters();
467 * Do process profiling
469 * If a pid was specified, attach each allocated PMC to the target
470 * process. Otherwise, fork a child and attach the PMCs to the child,
471 * and have the child exec() the target program.
475 pmcstat_start_process(void)
477 /* Signal the child to proceed. */
478 if (write(pmcstat_sockpair[PARENTSOCKET], "!", 1) != 1)
479 err(EX_OSERR, "ERROR (parent): write of token failed");
481 (void) close(pmcstat_sockpair[PARENTSOCKET]);
485 pmcstat_show_usage(void)
488 "[options] [commandline]\n"
489 "\t Measure process and/or system performance using hardware\n"
490 "\t performance monitoring counters.\n"
491 "\t Options include:\n"
492 "\t -C\t\t (toggle) show cumulative counts\n"
493 "\t -D path\t create profiles in directory \"path\"\n"
494 "\t -E\t\t (toggle) show counts at process exit\n"
495 "\t -F file\t write a system-wide callgraph (Kcachegrind format)"
497 "\t -G file\t write a system-wide callgraph to \"file\"\n"
498 "\t -M file\t print executable/gmon file map to \"file\"\n"
499 "\t -N\t\t (toggle) capture callchains\n"
500 "\t -O file\t send log output to \"file\"\n"
501 "\t -P spec\t allocate a process-private sampling PMC\n"
502 "\t -R file\t read events from \"file\"\n"
503 "\t -S spec\t allocate a system-wide sampling PMC\n"
504 "\t -T\t\t start in top mode\n"
505 "\t -W\t\t (toggle) show counts per context switch\n"
506 "\t -a <file>\t print sampled PCs and callgraph to \"file\"\n"
507 "\t -c cpu-list\t set cpus for subsequent system-wide PMCs\n"
508 "\t -d\t\t (toggle) track descendants\n"
509 "\t -f spec\t pass \"spec\" to as plugin option\n"
510 "\t -g\t\t produce gprof(1) compatible profiles\n"
511 "\t -k dir\t\t set the path to the kernel\n"
512 "\t -m file\t print sampled PCs to \"file\"\n"
513 "\t -n rate\t set sampling rate\n"
514 "\t -o file\t send print output to \"file\"\n"
515 "\t -p spec\t allocate a process-private counting PMC\n"
516 "\t -q\t\t suppress verbosity\n"
517 "\t -r fsroot\t specify FS root directory\n"
518 "\t -s spec\t allocate a system-wide counting PMC\n"
519 "\t -t process-spec attach to running processes matching "
521 "\t -v\t\t increase verbosity\n"
522 "\t -w secs\t set printing time interval\n"
523 "\t -z depth\t limit callchain display depth"
528 * At exit handler for top mode
532 pmcstat_topexit(void)
550 main(int argc, char **argv)
554 int hcpu, option, npmc, ncpu;
555 int c, check_driver_stats, current_sampling_count;
556 int do_callchain, do_descendants, do_logproccsw, do_logprocexit;
557 int do_print, do_read;
561 int use_cumulative_counts;
564 const char *errmsg, *graphfilename;
565 enum pmcstat_state runstate;
566 struct pmc_driverstats ds_start, ds_end;
567 struct pmcstat_ev *ev;
572 char buffer[PATH_MAX];
574 check_driver_stats = 0;
575 current_sampling_count = DEFAULT_SAMPLE_COUNT;
580 use_cumulative_counts = 0;
582 args.pa_required = 0;
584 args.pa_verbosity = 1;
587 args.pa_kernel = strdup("/boot/kernel");
588 args.pa_samplesdir = ".";
589 args.pa_printfile = stderr;
590 args.pa_graphdepth = DEFAULT_CALLGRAPH_DEPTH;
591 args.pa_graphfile = NULL;
592 args.pa_interval = DEFAULT_WAIT_INTERVAL;
593 args.pa_mapfilename = NULL;
594 args.pa_inputpath = NULL;
595 args.pa_outputpath = NULL;
596 args.pa_pplugin = PMCSTAT_PL_NONE;
597 args.pa_plugin = PMCSTAT_PL_NONE;
598 args.pa_ctdumpinstr = 1;
599 args.pa_topmode = PMCSTAT_TOP_DELTA;
601 args.pa_topcolor = 0;
602 args.pa_mergepmc = 0;
603 STAILQ_INIT(&args.pa_events);
604 SLIST_INIT(&args.pa_targets);
605 bzero(&ds_start, sizeof(ds_start));
606 bzero(&ds_end, sizeof(ds_end));
611 * The initial CPU mask specifies all non-halted CPUS in the
615 if (sysctlbyname("hw.ncpu", &ncpu, &dummy, NULL, 0) < 0)
616 err(EX_OSERR, "ERROR: Cannot determine the number of CPUs");
617 for (hcpu = 0; hcpu < ncpu; hcpu++)
618 CPU_SET(hcpu, &cpumask);
620 while ((option = getopt(argc, argv,
621 "CD:EF:G:M:NO:P:R:S:TWa:c:df:gk:m:n:o:p:qr:s:t:vw:z:")) != -1)
623 case 'a': /* Annotate + callgraph */
624 args.pa_flags |= FLAG_DO_ANNOTATE;
625 args.pa_plugin = PMCSTAT_PL_ANNOTATE_CG;
626 graphfilename = optarg;
629 case 'C': /* cumulative values */
630 use_cumulative_counts = !use_cumulative_counts;
631 args.pa_required |= FLAG_HAS_COUNTING_PMCS;
636 if (optarg[0] == '*' && optarg[1] == '\0') {
637 for (hcpu = 0; hcpu < ncpu; hcpu++)
638 CPU_SET(hcpu, &cpumask);
640 pmcstat_get_cpumask(optarg, &cpumask);
642 args.pa_flags |= FLAGS_HAS_CPUMASK;
643 args.pa_required |= FLAG_HAS_SYSTEM_PMCS;
647 if (stat(optarg, &sb) < 0)
648 err(EX_OSERR, "ERROR: Cannot stat \"%s\"",
650 if (!S_ISDIR(sb.st_mode))
652 "ERROR: \"%s\" is not a directory.",
654 args.pa_samplesdir = optarg;
655 args.pa_flags |= FLAG_HAS_SAMPLESDIR;
656 args.pa_required |= FLAG_DO_GPROF;
659 case 'd': /* toggle descendents */
660 do_descendants = !do_descendants;
661 args.pa_required |= FLAG_HAS_PROCESS_PMCS;
664 case 'F': /* produce a system-wide calltree */
665 args.pa_flags |= FLAG_DO_CALLGRAPHS;
666 args.pa_plugin = PMCSTAT_PL_CALLTREE;
667 graphfilename = optarg;
670 case 'f': /* plugins options */
671 if (args.pa_plugin == PMCSTAT_PL_NONE)
672 err(EX_USAGE, "ERROR: Need -g/-G/-m/-T.");
673 pmcstat_pluginconfigure_log(optarg);
676 case 'G': /* produce a system-wide callgraph */
677 args.pa_flags |= FLAG_DO_CALLGRAPHS;
678 args.pa_plugin = PMCSTAT_PL_CALLGRAPH;
679 graphfilename = optarg;
682 case 'g': /* produce gprof compatible profiles */
683 args.pa_flags |= FLAG_DO_GPROF;
684 args.pa_pplugin = PMCSTAT_PL_CALLGRAPH;
685 args.pa_plugin = PMCSTAT_PL_GPROF;
688 case 'k': /* pathname to the kernel */
689 free(args.pa_kernel);
690 args.pa_kernel = strdup(optarg);
691 args.pa_required |= FLAG_DO_ANALYSIS;
692 args.pa_flags |= FLAG_HAS_KERNELPATH;
696 args.pa_flags |= FLAG_DO_ANNOTATE;
697 args.pa_plugin = PMCSTAT_PL_ANNOTATE;
698 graphfilename = optarg;
701 case 'E': /* log process exit */
702 do_logprocexit = !do_logprocexit;
703 args.pa_required |= (FLAG_HAS_PROCESS_PMCS |
704 FLAG_HAS_COUNTING_PMCS | FLAG_HAS_OUTPUT_LOGFILE);
707 case 'M': /* mapfile */
708 args.pa_mapfilename = optarg;
712 do_callchain = !do_callchain;
713 args.pa_required |= FLAG_HAS_SAMPLING_PMCS;
716 case 'p': /* process virtual counting PMC */
717 case 's': /* system-wide counting PMC */
718 case 'P': /* process virtual sampling PMC */
719 case 'S': /* system-wide sampling PMC */
720 if ((ev = malloc(sizeof(*ev))) == NULL)
721 errx(EX_SOFTWARE, "ERROR: Out of memory.");
724 case 'p': ev->ev_mode = PMC_MODE_TC; break;
725 case 's': ev->ev_mode = PMC_MODE_SC; break;
726 case 'P': ev->ev_mode = PMC_MODE_TS; break;
727 case 'S': ev->ev_mode = PMC_MODE_SS; break;
730 if (option == 'P' || option == 'p') {
731 args.pa_flags |= FLAG_HAS_PROCESS_PMCS;
732 args.pa_required |= (FLAG_HAS_COMMANDLINE |
736 if (option == 'P' || option == 'S') {
737 args.pa_flags |= FLAG_HAS_SAMPLING_PMCS;
738 args.pa_required |= (FLAG_HAS_PIPE |
739 FLAG_HAS_OUTPUT_LOGFILE);
742 if (option == 'p' || option == 's')
743 args.pa_flags |= FLAG_HAS_COUNTING_PMCS;
745 if (option == 's' || option == 'S')
746 args.pa_flags |= FLAG_HAS_SYSTEM_PMCS;
748 ev->ev_spec = strdup(optarg);
750 if (option == 'S' || option == 'P')
751 ev->ev_count = current_sampling_count;
755 if (option == 'S' || option == 's') {
756 hcpu = sizeof(cpumask) * NBBY;
757 for (hcpu--; hcpu >= 0; hcpu--)
758 if (CPU_ISSET(hcpu, &cpumask))
762 ev->ev_cpu = PMC_CPU_ANY;
766 ev->ev_flags |= PMC_F_CALLCHAIN;
768 ev->ev_flags |= PMC_F_DESCENDANTS;
770 ev->ev_flags |= PMC_F_LOG_PROCEXIT;
772 ev->ev_flags |= PMC_F_LOG_PROCCSW;
774 ev->ev_cumulative = use_cumulative_counts;
777 ev->ev_pmcid = PMC_ID_INVALID;
779 /* extract event name */
780 c = strcspn(optarg, ", \t");
781 ev->ev_name = malloc(c + 1);
782 (void) strncpy(ev->ev_name, optarg, c);
783 *(ev->ev_name + c) = '\0';
785 STAILQ_INSERT_TAIL(&args.pa_events, ev, ev_next);
787 if (option == 's' || option == 'S') {
788 hcpu = CPU_ISSET(ev->ev_cpu, &cpumask);
789 CPU_CLR(ev->ev_cpu, &cpumask);
790 pmcstat_clone_event_descriptor(ev, &cpumask);
792 CPU_SET(ev->ev_cpu, &cpumask);
797 case 'n': /* sampling count */
798 current_sampling_count = strtol(optarg, &end, 0);
799 if (*end != '\0' || current_sampling_count <= 0)
801 "ERROR: Illegal count value \"%s\".",
803 args.pa_required |= FLAG_HAS_SAMPLING_PMCS;
806 case 'o': /* outputfile */
807 if (args.pa_printfile != NULL &&
808 args.pa_printfile != stdout &&
809 args.pa_printfile != stderr)
810 (void) fclose(args.pa_printfile);
811 if ((args.pa_printfile = fopen(optarg, "w")) == NULL)
813 "ERROR: cannot open \"%s\" for writing.",
815 args.pa_flags |= FLAG_DO_PRINT;
818 case 'O': /* sampling output */
819 if (args.pa_outputpath)
821 "ERROR: option -O may only be specified once.");
822 args.pa_outputpath = optarg;
823 args.pa_flags |= FLAG_HAS_OUTPUT_LOGFILE;
826 case 'q': /* quiet mode */
827 args.pa_verbosity = 0;
830 case 'r': /* root FS path */
831 args.pa_fsroot = optarg;
834 case 'R': /* read an existing log file */
835 if (args.pa_inputpath != NULL)
837 "ERROR: option -R may only be specified once.");
838 args.pa_inputpath = optarg;
839 if (args.pa_printfile == stderr)
840 args.pa_printfile = stdout;
841 args.pa_flags |= FLAG_READ_LOGFILE;
844 case 't': /* target pid or process name */
845 pmcstat_find_targets(optarg);
847 args.pa_flags |= FLAG_HAS_TARGET;
848 args.pa_required |= FLAG_HAS_PROCESS_PMCS;
851 case 'T': /* top mode */
852 args.pa_flags |= FLAG_DO_TOP;
853 args.pa_plugin = PMCSTAT_PL_CALLGRAPH;
854 args.pa_ctdumpinstr = 0;
855 args.pa_mergepmc = 1;
856 if (args.pa_printfile == stderr)
857 args.pa_printfile = stdout;
860 case 'v': /* verbose */
864 case 'w': /* wait interval */
865 interval = strtod(optarg, &end);
866 if (*end != '\0' || interval <= 0)
868 "ERROR: Illegal wait interval value \"%s\".",
870 args.pa_flags |= FLAG_HAS_WAIT_INTERVAL;
871 args.pa_interval = interval;
874 case 'W': /* toggle LOG_CSW */
875 do_logproccsw = !do_logproccsw;
876 args.pa_required |= (FLAG_HAS_PROCESS_PMCS |
877 FLAG_HAS_COUNTING_PMCS | FLAG_HAS_OUTPUT_LOGFILE);
881 graphdepth = strtod(optarg, &end);
882 if (*end != '\0' || graphdepth <= 0)
884 "ERROR: Illegal callchain depth \"%s\".",
886 args.pa_graphdepth = graphdepth;
887 args.pa_required |= FLAG_DO_CALLGRAPHS;
892 pmcstat_show_usage();
897 args.pa_argc = (argc -= optind);
898 args.pa_argv = (argv += optind);
900 /* If we read from logfile and no specified CPU mask use
901 * the maximum CPU count.
903 if ((args.pa_flags & FLAG_READ_LOGFILE) &&
904 (args.pa_flags & FLAGS_HAS_CPUMASK) == 0)
907 args.pa_cpumask = cpumask; /* For selecting CPUs using -R. */
909 if (argc) /* command line present */
910 args.pa_flags |= FLAG_HAS_COMMANDLINE;
912 if (args.pa_flags & (FLAG_DO_GPROF | FLAG_DO_CALLGRAPHS |
913 FLAG_DO_ANNOTATE | FLAG_DO_TOP))
914 args.pa_flags |= FLAG_DO_ANALYSIS;
917 * Check invocation syntax.
920 /* disallow -O and -R together */
921 if (args.pa_outputpath && args.pa_inputpath)
923 "ERROR: options -O and -R are mutually exclusive.");
925 /* -m option is allowed with -R only. */
926 if (args.pa_flags & FLAG_DO_ANNOTATE && args.pa_inputpath == NULL)
927 errx(EX_USAGE, "ERROR: option %s requires an input file",
928 args.pa_plugin == PMCSTAT_PL_ANNOTATE ? "-m" : "-a");
930 /* -m option is not allowed combined with -g or -G. */
931 if (args.pa_flags & FLAG_DO_ANNOTATE &&
932 args.pa_flags & (FLAG_DO_GPROF | FLAG_DO_CALLGRAPHS))
934 "ERROR: option -m and -g | -G are mutually exclusive");
936 if (args.pa_flags & FLAG_READ_LOGFILE) {
938 if (args.pa_flags & FLAG_HAS_COMMANDLINE)
939 errmsg = "a command line specification";
940 else if (args.pa_flags & FLAG_HAS_TARGET)
941 errmsg = "option -t";
942 else if (!STAILQ_EMPTY(&args.pa_events))
943 errmsg = "a PMC event specification";
946 "ERROR: option -R may not be used with %s.",
948 } else if (STAILQ_EMPTY(&args.pa_events))
949 /* All other uses require a PMC spec. */
950 pmcstat_show_usage();
952 /* check for -t pid without a process PMC spec */
953 if ((args.pa_required & FLAG_HAS_TARGET) &&
954 (args.pa_flags & FLAG_HAS_PROCESS_PMCS) == 0)
956 "ERROR: option -t requires a process mode PMC to be specified."
959 /* check for process-mode options without a command or -t pid */
960 if ((args.pa_required & FLAG_HAS_PROCESS_PMCS) &&
961 (args.pa_flags & (FLAG_HAS_COMMANDLINE | FLAG_HAS_TARGET)) == 0)
963 "ERROR: options -d, -E, -p, -P, and -W require a command line or target process."
966 /* check for -p | -P without a target process of some sort */
967 if ((args.pa_required & (FLAG_HAS_COMMANDLINE | FLAG_HAS_TARGET)) &&
968 (args.pa_flags & (FLAG_HAS_COMMANDLINE | FLAG_HAS_TARGET)) == 0)
970 "ERROR: options -P and -p require a target process or a command line."
973 /* check for process-mode options without a process-mode PMC */
974 if ((args.pa_required & FLAG_HAS_PROCESS_PMCS) &&
975 (args.pa_flags & FLAG_HAS_PROCESS_PMCS) == 0)
977 "ERROR: options -d, -E, and -W require a process mode PMC to be specified."
980 /* check for -c cpu with no system mode PMCs or logfile. */
981 if ((args.pa_required & FLAG_HAS_SYSTEM_PMCS) &&
982 (args.pa_flags & FLAG_HAS_SYSTEM_PMCS) == 0 &&
983 (args.pa_flags & FLAG_READ_LOGFILE) == 0)
985 "ERROR: option -c requires at least one system mode PMC to be specified."
988 /* check for counting mode options without a counting PMC */
989 if ((args.pa_required & FLAG_HAS_COUNTING_PMCS) &&
990 (args.pa_flags & FLAG_HAS_COUNTING_PMCS) == 0)
992 "ERROR: options -C, -W and -o require at least one counting mode PMC to be specified."
995 /* check for sampling mode options without a sampling PMC spec */
996 if ((args.pa_required & FLAG_HAS_SAMPLING_PMCS) &&
997 (args.pa_flags & FLAG_HAS_SAMPLING_PMCS) == 0)
999 "ERROR: options -N, -n and -O require at least one sampling mode PMC to be specified."
1002 /* check if -g/-G/-m/-T are being used correctly */
1003 if ((args.pa_flags & FLAG_DO_ANALYSIS) &&
1004 !(args.pa_flags & (FLAG_HAS_SAMPLING_PMCS|FLAG_READ_LOGFILE)))
1006 "ERROR: options -g/-G/-m/-T require sampling PMCs or -R to be specified."
1009 /* check if -O was spuriously specified */
1010 if ((args.pa_flags & FLAG_HAS_OUTPUT_LOGFILE) &&
1011 (args.pa_required & FLAG_HAS_OUTPUT_LOGFILE) == 0)
1013 "ERROR: option -O is used only with options -E, -P, -S and -W."
1016 /* -k kernel path require -g/-G/-m/-T or -R */
1017 if ((args.pa_flags & FLAG_HAS_KERNELPATH) &&
1018 (args.pa_flags & FLAG_DO_ANALYSIS) == 0 &&
1019 (args.pa_flags & FLAG_READ_LOGFILE) == 0)
1020 errx(EX_USAGE, "ERROR: option -k is only used with -g/-R/-m/-T.");
1022 /* -D only applies to gprof output mode (-g) */
1023 if ((args.pa_flags & FLAG_HAS_SAMPLESDIR) &&
1024 (args.pa_flags & FLAG_DO_GPROF) == 0)
1025 errx(EX_USAGE, "ERROR: option -D is only used with -g.");
1027 /* -M mapfile requires -g or -R */
1028 if (args.pa_mapfilename != NULL &&
1029 (args.pa_flags & FLAG_DO_GPROF) == 0 &&
1030 (args.pa_flags & FLAG_READ_LOGFILE) == 0)
1031 errx(EX_USAGE, "ERROR: option -M is only used with -g/-R.");
1034 * Disallow textual output of sampling PMCs if counting PMCs
1035 * have also been asked for, mostly because the combined output
1036 * is difficult to make sense of.
1038 if ((args.pa_flags & FLAG_HAS_COUNTING_PMCS) &&
1039 (args.pa_flags & FLAG_HAS_SAMPLING_PMCS) &&
1040 ((args.pa_flags & FLAG_HAS_OUTPUT_LOGFILE) == 0))
1042 "ERROR: option -O is required if counting and sampling PMCs are specified together."
1046 * Check if "-k kerneldir" was specified, and if whether
1047 * 'kerneldir' actually refers to a file. If so, use
1048 * `dirname path` to determine the kernel directory.
1050 if (args.pa_flags & FLAG_HAS_KERNELPATH) {
1051 (void) snprintf(buffer, sizeof(buffer), "%s%s", args.pa_fsroot,
1053 if (stat(buffer, &sb) < 0)
1054 err(EX_OSERR, "ERROR: Cannot locate kernel \"%s\"",
1056 if (!S_ISREG(sb.st_mode) && !S_ISDIR(sb.st_mode))
1057 errx(EX_USAGE, "ERROR: \"%s\": Unsupported file type.",
1059 if (!S_ISDIR(sb.st_mode)) {
1060 tmp = args.pa_kernel;
1061 args.pa_kernel = strdup(dirname(args.pa_kernel));
1063 (void) snprintf(buffer, sizeof(buffer), "%s%s",
1064 args.pa_fsroot, args.pa_kernel);
1065 if (stat(buffer, &sb) < 0)
1066 err(EX_OSERR, "ERROR: Cannot stat \"%s\"",
1068 if (!S_ISDIR(sb.st_mode))
1070 "ERROR: \"%s\" is not a directory.",
1076 * If we have a callgraph be created, select the outputfile.
1078 if (args.pa_flags & FLAG_DO_CALLGRAPHS) {
1079 if (strcmp(graphfilename, "-") == 0)
1080 args.pa_graphfile = args.pa_printfile;
1082 args.pa_graphfile = fopen(graphfilename, "w");
1083 if (args.pa_graphfile == NULL)
1085 "ERROR: cannot open \"%s\" for writing",
1089 if (args.pa_flags & FLAG_DO_ANNOTATE) {
1090 args.pa_graphfile = fopen(graphfilename, "w");
1091 if (args.pa_graphfile == NULL)
1092 err(EX_OSERR, "ERROR: cannot open \"%s\" for writing",
1096 /* if we've been asked to process a log file, skip init */
1097 if ((args.pa_flags & FLAG_READ_LOGFILE) == 0) {
1100 "ERROR: Initialization of the pmc(3) library failed"
1103 if ((npmc = pmc_npmc(0)) < 0) /* assume all CPUs are identical */
1105 "ERROR: Cannot determine the number of PMCs on CPU %d",
1109 /* Allocate a kqueue */
1110 if ((pmcstat_kq = kqueue()) < 0)
1111 err(EX_OSERR, "ERROR: Cannot allocate kqueue");
1113 /* Setup the logfile as the source. */
1114 if (args.pa_flags & FLAG_READ_LOGFILE) {
1116 * Print the log in textual form if we haven't been
1117 * asked to generate profiling information.
1119 if ((args.pa_flags & FLAG_DO_ANALYSIS) == 0)
1120 args.pa_flags |= FLAG_DO_PRINT;
1122 pmcstat_initialize_logging();
1123 rfd = pmcstat_open_log(args.pa_inputpath,
1124 PMCSTAT_OPEN_FOR_READ);
1125 if ((args.pa_logparser = pmclog_open(rfd)) == NULL)
1126 err(EX_OSERR, "ERROR: Cannot create parser");
1127 if (fcntl(rfd, F_SETFL, O_NONBLOCK) < 0)
1128 err(EX_OSERR, "ERROR: fcntl(2) failed");
1129 EV_SET(&kev, rfd, EVFILT_READ, EV_ADD,
1131 if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0)
1132 err(EX_OSERR, "ERROR: Cannot register kevent");
1135 * Configure the specified log file or setup a default log
1136 * consumer via a pipe.
1138 if (args.pa_required & FLAG_HAS_OUTPUT_LOGFILE) {
1139 if (args.pa_outputpath)
1140 args.pa_logfd = pmcstat_open_log(args.pa_outputpath,
1141 PMCSTAT_OPEN_FOR_WRITE);
1144 * process the log on the fly by reading it in
1147 if (pipe(pipefd) < 0)
1148 err(EX_OSERR, "ERROR: pipe(2) failed");
1150 if (fcntl(pipefd[READPIPEFD], F_SETFL, O_NONBLOCK) < 0)
1151 err(EX_OSERR, "ERROR: fcntl(2) failed");
1153 EV_SET(&kev, pipefd[READPIPEFD], EVFILT_READ, EV_ADD,
1156 if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0)
1157 err(EX_OSERR, "ERROR: Cannot register kevent");
1159 args.pa_logfd = pipefd[WRITEPIPEFD];
1161 args.pa_flags |= FLAG_HAS_PIPE;
1162 if ((args.pa_flags & FLAG_DO_TOP) == 0)
1163 args.pa_flags |= FLAG_DO_PRINT;
1164 args.pa_logparser = pmclog_open(pipefd[READPIPEFD]);
1167 if (pmc_configure_logfile(args.pa_logfd) < 0)
1168 err(EX_OSERR, "ERROR: Cannot configure log file");
1171 /* remember to check for driver errors if we are sampling or logging */
1172 check_driver_stats = (args.pa_flags & FLAG_HAS_SAMPLING_PMCS) ||
1173 (args.pa_flags & FLAG_HAS_OUTPUT_LOGFILE);
1176 if (args.pa_flags & FLAG_READ_LOGFILE) {
1180 STAILQ_FOREACH(ev, &args.pa_events, ev_next) {
1181 if (pmc_allocate(ev->ev_spec, ev->ev_mode,
1182 ev->ev_flags, ev->ev_cpu, &ev->ev_pmcid) < 0)
1184 "ERROR: Cannot allocate %s-mode pmc with specification \"%s\"",
1185 PMC_IS_SYSTEM_MODE(ev->ev_mode) ?
1186 "system" : "process", ev->ev_spec);
1188 if (PMC_IS_SAMPLING_MODE(ev->ev_mode) &&
1189 pmc_set(ev->ev_pmcid, ev->ev_count) < 0)
1191 "ERROR: Cannot set sampling count for PMC \"%s\"",
1195 /* compute printout widths */
1196 STAILQ_FOREACH(ev, &args.pa_events, ev_next) {
1201 (void) pmc_width(ev->ev_pmcid, &counter_width);
1202 header_width = strlen(ev->ev_name) + 2; /* prefix '%c/' */
1203 display_width = (int) floor(counter_width / 3.32193) + 1;
1205 if (PMC_IS_SYSTEM_MODE(ev->ev_mode))
1206 header_width += 3; /* 2 digit CPU number + '/' */
1208 if (header_width > display_width) {
1209 ev->ev_fieldskip = 0;
1210 ev->ev_fieldwidth = header_width;
1212 ev->ev_fieldskip = display_width -
1214 ev->ev_fieldwidth = display_width;
1219 * If our output is being set to a terminal, register a handler
1220 * for window size changes.
1223 if (isatty(fileno(args.pa_printfile))) {
1225 if (ioctl(fileno(args.pa_printfile), TIOCGWINSZ, &ws) < 0)
1226 err(EX_OSERR, "ERROR: Cannot determine window size");
1228 pmcstat_displayheight = ws.ws_row - 1;
1229 pmcstat_displaywidth = ws.ws_col - 1;
1231 EV_SET(&kev, SIGWINCH, EVFILT_SIGNAL, EV_ADD, 0, 0, NULL);
1233 if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0)
1235 "ERROR: Cannot register kevent for SIGWINCH");
1241 * Listen to key input in top mode.
1243 if (args.pa_flags & FLAG_DO_TOP) {
1244 EV_SET(&kev, fileno(stdin), EVFILT_READ, EV_ADD, 0, 0, NULL);
1245 if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0)
1246 err(EX_OSERR, "ERROR: Cannot register kevent");
1249 EV_SET(&kev, SIGINT, EVFILT_SIGNAL, EV_ADD, 0, 0, NULL);
1250 if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0)
1251 err(EX_OSERR, "ERROR: Cannot register kevent for SIGINT");
1253 EV_SET(&kev, SIGIO, EVFILT_SIGNAL, EV_ADD, 0, 0, NULL);
1254 if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0)
1255 err(EX_OSERR, "ERROR: Cannot register kevent for SIGIO");
1258 * An exec() failure of a forked child is signalled by the
1259 * child sending the parent a SIGCHLD. We don't register an
1260 * actual signal handler for SIGCHLD, but instead use our
1261 * kqueue to pick up the signal.
1263 EV_SET(&kev, SIGCHLD, EVFILT_SIGNAL, EV_ADD, 0, 0, NULL);
1264 if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0)
1265 err(EX_OSERR, "ERROR: Cannot register kevent for SIGCHLD");
1268 * Setup a timer if we have counting mode PMCs needing to be printed or
1269 * top mode plugin is active.
1271 if (((args.pa_flags & FLAG_HAS_COUNTING_PMCS) &&
1272 (args.pa_required & FLAG_HAS_OUTPUT_LOGFILE) == 0) ||
1273 (args.pa_flags & FLAG_DO_TOP)) {
1274 EV_SET(&kev, 0, EVFILT_TIMER, EV_ADD, 0,
1275 args.pa_interval * 1000, NULL);
1277 if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0)
1279 "ERROR: Cannot register kevent for timer");
1282 /* attach PMCs to the target process, starting it if specified */
1283 if (args.pa_flags & FLAG_HAS_COMMANDLINE)
1284 pmcstat_create_process();
1286 if (check_driver_stats && pmc_get_driver_stats(&ds_start) < 0)
1287 err(EX_OSERR, "ERROR: Cannot retrieve driver statistics");
1289 /* Attach process pmcs to the target process. */
1290 if (args.pa_flags & (FLAG_HAS_TARGET | FLAG_HAS_COMMANDLINE)) {
1291 if (SLIST_EMPTY(&args.pa_targets))
1293 "ERROR: No matching target processes.");
1294 if (args.pa_flags & FLAG_HAS_PROCESS_PMCS)
1295 pmcstat_attach_pmcs();
1298 kvm_close(pmcstat_kvm);
1303 /* start the pmcs */
1304 pmcstat_start_pmcs();
1306 /* start the (commandline) process if needed */
1307 if (args.pa_flags & FLAG_HAS_COMMANDLINE)
1308 pmcstat_start_process();
1310 /* initialize logging */
1311 pmcstat_initialize_logging();
1313 /* Handle SIGINT using the kqueue loop */
1314 sa.sa_handler = SIG_IGN;
1316 (void) sigemptyset(&sa.sa_mask);
1318 if (sigaction(SIGINT, &sa, NULL) < 0)
1319 err(EX_OSERR, "ERROR: Cannot install signal handler");
1322 * Setup the top mode display.
1324 if (args.pa_flags & FLAG_DO_TOP) {
1325 args.pa_flags &= ~FLAG_DO_PRINT;
1327 if (args.pa_toptty) {
1332 if(has_colors() == TRUE) {
1333 args.pa_topcolor = 1;
1335 use_default_colors();
1336 pair_content(0, &cf, &cb);
1337 init_pair(1, COLOR_RED, cb);
1338 init_pair(2, COLOR_YELLOW, cb);
1339 init_pair(3, COLOR_GREEN, cb);
1345 intrflush(stdscr, FALSE);
1346 keypad(stdscr, TRUE);
1348 /* Get terminal width / height with ncurses. */
1350 pmcstat_displayheight, pmcstat_displaywidth);
1351 pmcstat_displayheight--; pmcstat_displaywidth--;
1352 atexit(pmcstat_topexit);
1357 * loop till either the target process (if any) exits, or we
1358 * are killed by a SIGINT.
1360 runstate = PMCSTAT_RUNNING;
1361 do_print = do_read = 0;
1363 if ((c = kevent(pmcstat_kq, NULL, 0, &kev, 1, NULL)) <= 0) {
1365 err(EX_OSERR, "ERROR: kevent failed");
1370 if (kev.flags & EV_ERROR)
1371 errc(EX_OSERR, kev.data, "ERROR: kevent failed");
1373 switch (kev.filter) {
1374 case EVFILT_PROC: /* target has exited */
1375 runstate = pmcstat_close_log();
1379 case EVFILT_READ: /* log file data is present */
1380 if (kev.ident == (unsigned)fileno(stdin) &&
1381 (args.pa_flags & FLAG_DO_TOP)) {
1382 if (pmcstat_keypress_log())
1383 runstate = pmcstat_close_log();
1386 runstate = pmcstat_process_log();
1391 if (kev.ident == SIGCHLD) {
1393 * The child process sends us a
1394 * SIGCHLD if its exec() failed. We
1395 * wait for it to exit and then exit
1399 runstate = PMCSTAT_FINISHED;
1400 } else if (kev.ident == SIGIO) {
1402 * We get a SIGIO if a PMC loses all
1403 * of its targets, or if logfile
1404 * writes encounter an error.
1406 runstate = pmcstat_close_log();
1407 do_print = 1; /* print PMCs at exit */
1408 } else if (kev.ident == SIGINT) {
1409 /* Kill the child process if we started it */
1410 if (args.pa_flags & FLAG_HAS_COMMANDLINE)
1411 pmcstat_kill_process();
1412 runstate = pmcstat_close_log();
1413 } else if (kev.ident == SIGWINCH) {
1414 if (ioctl(fileno(args.pa_printfile),
1415 TIOCGWINSZ, &ws) < 0)
1417 "ERROR: Cannot determine window size");
1418 pmcstat_displayheight = ws.ws_row - 1;
1419 pmcstat_displaywidth = ws.ws_col - 1;
1425 case EVFILT_TIMER: /* print out counting PMCs */
1426 if ((args.pa_flags & FLAG_DO_TOP) &&
1427 pmc_flush_logfile() == 0)
1434 if (do_print && !do_read) {
1435 if ((args.pa_required & FLAG_HAS_OUTPUT_LOGFILE) == 0) {
1436 pmcstat_print_pmcs();
1437 if (runstate == PMCSTAT_FINISHED &&
1439 (args.pa_flags & FLAG_DO_PRINT) == 0)
1440 (void) fprintf(args.pa_printfile, "\n");
1442 if (args.pa_flags & FLAG_DO_TOP)
1443 pmcstat_display_log();
1447 } while (runstate != PMCSTAT_FINISHED);
1449 if ((args.pa_flags & FLAG_DO_TOP) && args.pa_toptty) {
1454 /* flush any pending log entries */
1455 if (args.pa_flags & (FLAG_HAS_OUTPUT_LOGFILE | FLAG_HAS_PIPE))
1456 pmc_close_logfile();
1460 free(args.pa_kernel);
1462 /* check if the driver lost any samples or events */
1463 if (check_driver_stats) {
1464 if (pmc_get_driver_stats(&ds_end) < 0)
1466 "ERROR: Cannot retrieve driver statistics");
1467 if (ds_start.pm_intr_bufferfull != ds_end.pm_intr_bufferfull &&
1468 args.pa_verbosity > 0)
1469 warnx("WARNING: some samples were dropped.\n"
1470 "Please consider tuning the \"kern.hwpmc.nsamples\" tunable."
1472 if (ds_start.pm_buffer_requests_failed !=
1473 ds_end.pm_buffer_requests_failed &&
1474 args.pa_verbosity > 0)
1475 warnx("WARNING: some events were discarded.\n"
1476 "Please consider tuning the \"kern.hwpmc.nbuffers\" tunable."