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freebsd-skq/usr.sbin/pmcstat/pmcstat.c
jkoshy d308f9605c - Don't print an errno string when reporting dropped samples. 
- Prevent an unsuccessful exec() of a target program from triggering
  a false 'dropped samples' message.
2005-12-24 17:00:33 +00:00

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/*-
* Copyright (c) 2003-2005, 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/socket.h>
#include <sys/stat.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 <pmclog.h>
#include <signal.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>
#include "pmcstat.h"
/*
* A given invocation of pmcstat(8) can manage multiple PMCs of both
* the system-wide and per-process variety. Each of these could be in
* 'counting mode' or in 'sampling mode'.
*
* For 'counting mode' PMCs, pmcstat(8) will periodically issue a
* pmc_read() at the configured time interval and print out the value
* of the requested PMCs.
*
* For 'sampling mode' PMCs it can log to a file for offline analysis,
* or can analyse sampling data "on the fly", either by converting
* samples to printed textual form or by creating gprof(1) compatible
* profiles, one per program executed. When creating gprof(1)
* profiles it can optionally merge entries from multiple processes
* for a given executable into a single profile file.
*/
/* Globals */
int pmcstat_interrupt = 0;
int pmcstat_displayheight = DEFAULT_DISPLAY_HEIGHT;
int pmcstat_pipefd[NPIPEFD];
int pmcstat_kq;
/*
* cleanup
*/
void
pmcstat_cleanup(struct pmcstat_args *a)
{
struct pmcstat_ev *ev, *tmp;
/* 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 "
"0x%x \"%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);
}
/* de-configure the log file if present. */
if (a->pa_flags & (FLAG_HAS_PIPE | FLAG_HAS_OUTPUT_LOGFILE))
(void) pmc_configure_logfile(-1);
if (a->pa_logparser) {
pmclog_close(a->pa_logparser);
a->pa_logparser = NULL;
}
if (a->pa_flags & (FLAG_HAS_PIPE | FLAG_HAS_OUTPUT_LOGFILE))
pmcstat_shutdown_logging();
}
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 0x%x \"%s\"",
ev->ev_pmcid, ev->ev_name);
pmcstat_cleanup(a);
exit(EX_OSERR);
}
}
}
void
pmcstat_print_headers(struct pmcstat_args *a)
{
struct pmcstat_ev *ev;
int c;
(void) fprintf(a->pa_printfile, 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_printfile, "%*s%c/%*s ",
ev->ev_fieldskip, "", c,
ev->ev_fieldwidth - ev->ev_fieldskip - 2,
ev->ev_name);
} else
(void) fprintf(a->pa_printfile, "%c/%*s ",
c, ev->ev_fieldwidth - 2, ev->ev_name);
}
(void) fflush(a->pa_printfile);
}
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_printfile, "%*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_printfile);
}
/*
* Print output
*/
void
pmcstat_print_pmcs(struct pmcstat_args *a)
{
static int linecount = 0;
/* check if we need to print a header line */
if (++linecount > pmcstat_displayheight) {
(void) fprintf(a->pa_printfile, "\n");
linecount = 1;
}
if (linecount == 1)
pmcstat_print_headers(a);
(void) fprintf(a->pa_printfile, "\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, &a->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(*a->pa_argv, a->pa_argv);
/* and if that fails, notify the parent */
kill(getppid(), SIGCHLD);
err(EX_OSERR, "ERROR: execvp \"%s\" failed",
*a->pa_argv);
/*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 target process exits */
EV_SET(&kev, a->pa_pid, EVFILT_PROC, EV_ADD|EV_ONESHOT, NOTE_EXIT, 0,
NULL);
if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0)
err(EX_OSERR, "ERROR: cannot monitor child 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) show cumulative counts\n"
"\t -D path\t create profiles in directory \"path\"\n"
"\t -E\t\t (toggle) show counts at process exit\n"
"\t -O file\t send log output to \"file\"\n"
"\t -P spec\t allocate a process-private sampling PMC\n"
"\t -R file\t read events from \"file\"\n"
"\t -S spec\t allocate a system-wide sampling PMC\n"
"\t -W\t\t (toggle) show counts per context switch\n"
"\t -c cpu\t\t set cpu for subsequent system-wide PMCs\n"
"\t -d\t\t (toggle) track descendants\n"
"\t -g\t\t produce gprof(1) compatible profiles\n"
"\t -k file\t set the path to the kernel\n"
"\t -n rate\t set sampling rate\n"
"\t -o file\t send print output to \"file\"\n"
"\t -p spec\t allocate a process-private counting PMC\n"
"\t -s spec\t allocate a system-wide counting PMC\n"
"\t -t pid\t\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, check_driver_stats, current_cpu, current_sampling_count;
int do_print, do_descendants;
int do_logproccsw, do_logprocexit;
int pipefd[2];
int use_cumulative_counts;
pid_t pid;
char *end;
const char *errmsg;
enum pmcstat_state runstate;
struct pmc_driverstats ds_start, ds_end;
struct pmcstat_ev *ev;
struct sigaction sa;
struct kevent kev;
struct winsize ws;
struct stat sb;
check_driver_stats = 0;
current_cpu = 0;
current_sampling_count = DEFAULT_SAMPLE_COUNT;
do_descendants = 0;
do_logproccsw = 0;
do_logprocexit = 0;
use_cumulative_counts = 0;
args.pa_required = 0;
args.pa_flags = 0;
args.pa_pid = (pid_t) -1;
args.pa_logfd = -1;
args.pa_samplesdir = ".";
args.pa_kernel = "/boot/kernel/kernel";
args.pa_printfile = stderr;
args.pa_interval = DEFAULT_WAIT_INTERVAL;
STAILQ_INIT(&args.pa_head);
bzero(&ds_start, sizeof(ds_start));
bzero(&ds_end, sizeof(ds_end));
ev = NULL;
while ((option = getopt(argc, argv, "CD:EO:P:R:S:Wc:dgk:n:o:p:s:t:w:"))
!= -1)
switch (option) {
case 'C': /* cumulative values */
use_cumulative_counts = !use_cumulative_counts;
args.pa_required |= FLAG_HAS_COUNTING_PMCS;
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);
args.pa_required |= FLAG_HAS_SYSTEM_PMCS;
break;
case 'D':
if (stat(optarg, &sb) < 0)
err(EX_OSERR, "ERROR: Cannot stat \"%s\"",
optarg);
if (!S_ISDIR(sb.st_mode))
errx(EX_USAGE, "ERROR: \"%s\" is not a "
"directory", optarg);
args.pa_samplesdir = optarg;
args.pa_flags |= FLAG_HAS_SAMPLESDIR;
args.pa_required |= FLAG_DO_GPROF;
break;
case 'd': /* toggle descendents */
do_descendants = !do_descendants;
args.pa_required |= FLAG_HAS_PROCESS_PMCS;
break;
case 'g': /* produce gprof compatible profiles */
args.pa_flags |= FLAG_DO_GPROF;
break;
case 'k': /* pathname to the kernel */
args.pa_kernel = optarg;
args.pa_required |= FLAG_DO_GPROF;
args.pa_flags |= FLAG_HAS_KERNELPATH;
break;
case 'E': /* log process exit */
do_logprocexit = !do_logprocexit;
args.pa_required |= (FLAG_HAS_PROCESS_PMCS |
FLAG_HAS_COUNTING_PMCS | FLAG_HAS_OUTPUT_LOGFILE);
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_HAS_PROCESS_PMCS;
args.pa_required |= (FLAG_HAS_COMMANDLINE |
FLAG_HAS_PID);
}
if (option == 'P' || option == 'S') {
args.pa_flags |= FLAG_HAS_SAMPLING_PMCS;
args.pa_required |= (FLAG_HAS_PIPE |
FLAG_HAS_OUTPUT_LOGFILE);
}
if (option == 'p' || option == 's')
args.pa_flags |= FLAG_HAS_COUNTING_PMCS;
if (option == 's' || option == 'S')
args.pa_flags |= FLAG_HAS_SYSTEM_PMCS;
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_flags = 0;
if (do_descendants)
ev->ev_flags |= PMC_F_DESCENDANTS;
if (do_logprocexit)
ev->ev_flags |= PMC_F_LOG_PROCEXIT;
if (do_logproccsw)
ev->ev_flags |= PMC_F_LOG_PROCCSW;
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);
args.pa_required |= FLAG_HAS_SAMPLING_PMCS;
break;
case 'o': /* outputfile */
if (args.pa_printfile != NULL)
(void) fclose(args.pa_printfile);
if ((args.pa_printfile = fopen(optarg, "w")) == NULL)
errx(EX_OSERR, "ERROR: cannot open \"%s\" for "
"writing.", optarg);
args.pa_flags |= FLAG_DO_PRINT;
break;
case 'O': /* sampling output */
if (args.pa_outputpath)
errx(EX_USAGE, "ERROR: option -O may only be "
"specified once.");
args.pa_outputpath = optarg;
args.pa_flags |= FLAG_HAS_OUTPUT_LOGFILE;
break;
case 'R': /* read an existing log file */
if (args.pa_logparser != NULL)
errx(EX_USAGE, "ERROR: option -R may only be "
"specified once.");
args.pa_inputpath = optarg;
if (args.pa_printfile == stderr)
args.pa_printfile = stdout;
args.pa_flags |= FLAG_READ_LOGFILE;
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_required |= FLAG_HAS_PROCESS_PMCS;
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_required |= FLAG_HAS_COUNTING_PMCS;
args.pa_interval = interval;
break;
case 'W': /* toggle LOG_CSW */
do_logproccsw = !do_logproccsw;
args.pa_required |= (FLAG_HAS_PROCESS_PMCS |
FLAG_HAS_COUNTING_PMCS | FLAG_HAS_OUTPUT_LOGFILE);
break;
case '?':
default:
pmcstat_show_usage();
break;
}
args.pa_argc = (argc -= optind);
args.pa_argv = (argv += optind);
if (argc) /* command line present */
args.pa_flags |= FLAG_HAS_COMMANDLINE;
/*
* Check invocation syntax.
*/
/* disallow -O and -R together */
if (args.pa_outputpath && args.pa_inputpath)
errx(EX_USAGE, "ERROR: options -O and -R are mutually "
"exclusive.");
if (args.pa_flags & FLAG_READ_LOGFILE) {
errmsg = NULL;
if (args.pa_flags & FLAG_HAS_COMMANDLINE)
errmsg = "a command line specification";
else if (args.pa_flags & FLAG_HAS_PID)
errmsg = "option -t";
else if (!STAILQ_EMPTY(&args.pa_head))
errmsg = "a PMC event specification";
if (errmsg)
errx(EX_USAGE, "ERROR: option -R may not be used with "
"%s.", errmsg);
} else if (STAILQ_EMPTY(&args.pa_head))
/* All other uses require a PMC spec. */
pmcstat_show_usage();
/* check for -t pid without a process PMC spec */
if ((args.pa_required & FLAG_HAS_PID) &&
(args.pa_flags & FLAG_HAS_PROCESS_PMCS) == 0)
errx(EX_USAGE, "ERROR: option -t requires a process mode PMC "
"to be specified.");
/* check for process-mode options without a command or -t pid */
if ((args.pa_required & FLAG_HAS_PROCESS_PMCS) &&
(args.pa_flags & (FLAG_HAS_COMMANDLINE | FLAG_HAS_PID)) == 0)
errx(EX_USAGE, "ERROR: options -d, -E, -p, -P, and -W require "
"a command line or target process.");
/* check for -p | -P without a target process of some sort */
if ((args.pa_required & (FLAG_HAS_COMMANDLINE | FLAG_HAS_PID)) &&
(args.pa_flags & (FLAG_HAS_COMMANDLINE | FLAG_HAS_PID)) == 0)
errx(EX_USAGE, "ERROR: options -P and -p require a "
"target process or a command line.");
/* check for process-mode options without a process-mode PMC */
if ((args.pa_required & FLAG_HAS_PROCESS_PMCS) &&
(args.pa_flags & FLAG_HAS_PROCESS_PMCS) == 0)
errx(EX_USAGE, "ERROR: options -d, -E, and -W require a "
"process mode PMC to be specified.");
/* check for -c cpu and not system mode PMCs */
if ((args.pa_required & FLAG_HAS_SYSTEM_PMCS) &&
(args.pa_flags & FLAG_HAS_SYSTEM_PMCS) == 0)
errx(EX_USAGE, "ERROR: option -c requires at least one "
"system mode PMC to be specified.");
/* check for counting mode options without a counting PMC */
if ((args.pa_required & FLAG_HAS_COUNTING_PMCS) &&
(args.pa_flags & FLAG_HAS_COUNTING_PMCS) == 0)
errx(EX_USAGE, "ERROR: options -C, -W, -o and -w require at "
"least one counting mode PMC to be specified.");
/* check for sampling mode options without a sampling PMC spec */
if ((args.pa_required & FLAG_HAS_SAMPLING_PMCS) &&
(args.pa_flags & FLAG_HAS_SAMPLING_PMCS) == 0)
errx(EX_USAGE, "ERROR: options -n and -O require at least "
"one sampling mode PMC to be specified.");
if ((args.pa_flags & (FLAG_HAS_PID | FLAG_HAS_COMMANDLINE)) ==
(FLAG_HAS_PID | FLAG_HAS_COMMANDLINE))
errx(EX_USAGE,
"ERROR: option -t cannot be specified with a command "
"line.");
/* check if -g is being used correctly */
if ((args.pa_flags & FLAG_DO_GPROF) &&
!(args.pa_flags & (FLAG_HAS_SAMPLING_PMCS|FLAG_READ_LOGFILE)))
errx(EX_USAGE, "ERROR: option -g requires sampling PMCs or -R "
"to be specified.");
/* check if -O was spuriously specified */
if ((args.pa_flags & FLAG_HAS_OUTPUT_LOGFILE) &&
(args.pa_required & FLAG_HAS_OUTPUT_LOGFILE) == 0)
errx(EX_USAGE,
"ERROR: option -O is used only with options "
"-E, -P, -S and -W.");
/* -D dir and -k kernel path require -g */
if ((args.pa_flags & FLAG_HAS_KERNELPATH) &&
((args.pa_flags & FLAG_DO_GPROF) == 0))
errx(EX_USAGE, "ERROR: option -k is only used with -g.");
if ((args.pa_flags & FLAG_HAS_SAMPLESDIR) &&
((args.pa_flags & FLAG_DO_GPROF) == 0))
errx(EX_USAGE, "ERROR: option -D is only used with -g.");
/*
* Disallow textual output of sampling PMCs if counting PMCs
* have also been asked for, mostly because the combined output
* is difficult to make sense of.
*/
if ((args.pa_flags & FLAG_HAS_COUNTING_PMCS) &&
(args.pa_flags & FLAG_HAS_SAMPLING_PMCS) &&
((args.pa_required & FLAG_HAS_OUTPUT_LOGFILE) == 0))
errx(EX_USAGE, "ERROR: option -O is required if counting and "
"sampling PMCs are specified together.");
/* if we've been asked to process a log file, do that and exit */
if (args.pa_flags & FLAG_READ_LOGFILE) {
/*
* Print the log in textual form if we haven't been
* asked to generate gmon.out files.
*/
if ((args.pa_flags & FLAG_DO_GPROF) == 0)
args.pa_flags |= FLAG_DO_PRINT;
pmcstat_initialize_logging(&args);
if ((args.pa_logfd = pmcstat_open(args.pa_inputpath,
PMCSTAT_OPEN_FOR_READ)) < 0)
err(EX_OSERR, "ERROR: Cannot open \"%s\" for "
"reading", args.pa_inputpath);
if ((args.pa_logparser = pmclog_open(args.pa_logfd)) == NULL)
err(EX_OSERR, "ERROR: Cannot create parser");
pmcstat_process_log(&args);
exit(EX_OK);
}
/* otherwise, we've been asked to collect data */
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 a kqueue */
if ((pmcstat_kq = kqueue()) < 0)
err(EX_OSERR, "ERROR: Cannot allocate kqueue");
/*
* Configure the specified log file or setup a default log
* consumer via a pipe.
*/
if (args.pa_required & FLAG_HAS_OUTPUT_LOGFILE) {
if (args.pa_outputpath) {
if ((args.pa_logfd = pmcstat_open(args.pa_outputpath,
PMCSTAT_OPEN_FOR_WRITE)) < 0)
err(EX_OSERR, "ERROR: Cannot open \"%s\" for "
"writing", args.pa_outputpath);
} else {
/*
* process the log on the fly by reading it in
* through a pipe.
*/
if (pipe(pipefd) < 0)
err(EX_OSERR, "ERROR: pipe(2) failed");
if (fcntl(pipefd[READPIPEFD], F_SETFL, O_NONBLOCK) < 0)
err(EX_OSERR, "ERROR: fcntl(2) failed");
EV_SET(&kev, pipefd[READPIPEFD], EVFILT_READ, EV_ADD,
0, 0, NULL);
if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0)
err(EX_OSERR, "ERROR: Cannot register kevent");
args.pa_logfd = pipefd[WRITEPIPEFD];
args.pa_flags |= (FLAG_HAS_PIPE | FLAG_DO_PRINT);
args.pa_logparser = pmclog_open(pipefd[READPIPEFD]);
}
if (pmc_configure_logfile(args.pa_logfd) < 0)
err(EX_OSERR, "ERROR: Cannot configure log file");
}
/* remember to check for driver errors if we are sampling or logging */
check_driver_stats = (args.pa_flags & FLAG_HAS_SAMPLING_PMCS) ||
(args.pa_flags & FLAG_HAS_OUTPUT_LOGFILE);
/*
* Allocate PMCs.
*/
STAILQ_FOREACH(ev, &args.pa_head, ev_next) {
if (pmc_allocate(ev->ev_spec, ev->ev_mode,
ev->ev_flags, 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);
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);
}
/* compute printout widths */
STAILQ_FOREACH(ev, &args.pa_head, ev_next) {
int counter_width;
int display_width;
int header_width;
(void) pmc_width(ev->ev_pmcid, &counter_width);
header_width = strlen(ev->ev_name) + 2; /* prefix '%c|' */
display_width = (int) floor(counter_width / 3.32193) + 1;
if (header_width > display_width) {
ev->ev_fieldskip = 0;
ev->ev_fieldwidth = header_width;
} else {
ev->ev_fieldskip = display_width -
header_width;
ev->ev_fieldwidth = display_width;
}
}
/*
* If our output is being set to a terminal, register a handler
* for window size changes.
*/
if (isatty(fileno(args.pa_printfile))) {
if (ioctl(fileno(args.pa_printfile), 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");
EV_SET(&kev, SIGIO, 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 SIGIO");
/*
* An exec() failure of a forked child is signalled by the
* child sending the parent a SIGCHLD. We don't register an
* actual signal handler for SIGCHLD, but instead use our
* kqueue to pick up the signal.
*/
EV_SET(&kev, SIGCHLD, 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 SIGCHLD");
/* setup a timer if we have counting mode PMCs needing to be printed */
if ((args.pa_flags & FLAG_HAS_COUNTING_PMCS) &&
(args.pa_required & FLAG_HAS_OUTPUT_LOGFILE) == 0) {
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_PID | FLAG_HAS_COMMANDLINE))
pmcstat_setup_process(&args);
if (check_driver_stats && pmc_get_driver_stats(&ds_start) < 0)
err(EX_OSERR, "ERROR: Cannot retrieve driver statistics");
/* start the pmcs */
pmcstat_start_pmcs(&args);
/* start the (commandline) process if needed */
if (args.pa_flags & FLAG_HAS_COMMANDLINE)
pmcstat_start_process(&args);
/* initialize logging if printing the configured log */
if ((args.pa_flags & FLAG_DO_PRINT) &&
(args.pa_flags & (FLAG_HAS_PIPE | FLAG_HAS_OUTPUT_LOGFILE)))
pmcstat_initialize_logging(&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.
*/
runstate = PMCSTAT_RUNNING;
do_print = 0;
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 has exited */
if (args.pa_flags & (FLAG_HAS_OUTPUT_LOGFILE |
FLAG_HAS_PIPE))
runstate = pmcstat_close_log(&args);
else
runstate = PMCSTAT_FINISHED;
do_print = 1;
break;
case EVFILT_READ: /* log file data is present */
runstate = pmcstat_process_log(&args);
break;
case EVFILT_SIGNAL:
if (kev.ident == SIGCHLD) {
/*
* The child process sends us a
* SIGCHLD if its exec() failed. We
* wait for it to exit and then exit
* ourselves.
*/
(void) wait(&c);
runstate = PMCSTAT_FINISHED;
} else if (kev.ident == SIGIO) {
/*
* We get a SIGIO if a PMC loses all
* of its targets, or if logfile
* writes encounter an error.
*/
if (args.pa_flags & (FLAG_HAS_OUTPUT_LOGFILE |
FLAG_HAS_PIPE)) {
runstate = pmcstat_close_log(&args);
if (args.pa_flags &
(FLAG_DO_PRINT|FLAG_DO_GPROF))
pmcstat_process_log(&args);
}
do_print = 1; /* print PMCs at exit */
runstate = PMCSTAT_FINISHED;
} else if (kev.ident == SIGINT) {
/* Kill the child process if we started it */
if (args.pa_flags & FLAG_HAS_COMMANDLINE)
if (kill(args.pa_pid, SIGINT) != 0)
err(EX_OSERR, "ERROR: cannot "
"signal child process");
runstate = PMCSTAT_FINISHED;
} else if (kev.ident == SIGWINCH) {
if (ioctl(fileno(args.pa_printfile),
TIOCGWINSZ, &ws) < 0)
err(EX_OSERR, "ERROR: Cannot determine "
"window size");
pmcstat_displayheight = ws.ws_row - 1;
} else
assert(0);
break;
case EVFILT_TIMER: /* print out counting PMCs */
do_print = 1;
break;
}
if (do_print &&
(args.pa_required & FLAG_HAS_OUTPUT_LOGFILE) == 0) {
pmcstat_print_pmcs(&args);
if (runstate == PMCSTAT_FINISHED && /* final newline */
(args.pa_flags & FLAG_DO_PRINT) == 0)
(void) fprintf(args.pa_printfile, "\n");
do_print = 0;
}
} while (runstate != PMCSTAT_FINISHED);
/* flush any pending log entries */
if (args.pa_flags & (FLAG_HAS_OUTPUT_LOGFILE | FLAG_HAS_PIPE))
pmc_flush_logfile();
pmcstat_cleanup(&args);
/* check if the driver lost any samples or events */
if (check_driver_stats) {
if (pmc_get_driver_stats(&ds_end) < 0)
err(EX_OSERR, "ERROR: Cannot retrieve driver "
"statistics");
if (ds_start.pm_intr_bufferfull != ds_end.pm_intr_bufferfull)
warnx("WARNING: some samples were dropped. Please "
"consider tuning the \"kern.hwpmc.nsamples\" "
"tunable.");
if (ds_start.pm_buffer_requests_failed !=
ds_end.pm_buffer_requests_failed)
warnx("WARNING: some events were discarded. Please "
"consider tuning the \"kern.hwpmc.nbuffers\" "
"tunable.");
}
exit(EX_OK);
}
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