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freebsd-skq/usr.sbin/pmcstat/pmcstat.c
Jonathan T. Looney 465dadb59b Support a wider history counter in pmcstat(8) gmon output 
pmcstat(8) contains an option to output sampling data in a gmon format
compatible with gprof(1). Currently, it uses the default histcounter,
which is an (unsigned short). With large sets of sampling data, it
is possible to overflow the maximum value provided by an (unsigned
short).

This change adds the -e argument to pmcstat. If -e and -g are both
specified, pmcstat will use a histcounter type of uint64_t.

Differential Revision:	https://reviews.freebsd.org/D4151
Reviewed by:	jhb, bjk
Approved by:	gnn (mentor)
MFC after:	1 month
Sponsored by:	Juniper Networks
2015-11-18 14:52:01 +00:00

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/*-
* Copyright (c) 2003-2008, Joseph Koshy
* Copyright (c) 2007 The FreeBSD Foundation
* All rights reserved.
*
* Portions of this software were developed by A. Joseph Koshy under
* sponsorship from the FreeBSD Foundation and Google, Inc.
*
* 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/param.h>
#include <sys/cpuset.h>
#include <sys/event.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <sys/time.h>
#include <sys/ttycom.h>
#include <sys/user.h>
#include <sys/wait.h>
#include <assert.h>
#include <curses.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <kvm.h>
#include <libgen.h>
#include <limits.h>
#include <math.h>
#include <pmc.h>
#include <pmclog.h>
#include <regex.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.
*
* pmcstat(8) can also execute a command line and attach PMCs to the
* resulting child process. The protocol used is as follows:
*
* - parent creates a socketpair for two way communication and
* fork()s.
* - subsequently:
*
* /Parent/ /Child/
*
* - Wait for childs token.
* - Sends token.
* - Awaits signal to start.
* - Attaches PMCs to the child's pid
* and starts them. Sets up
* monitoring for the child.
* - Signals child to start.
* - Receives signal, attempts exec().
*
* After this point normal processing can happen.
*/
/* Globals */
int pmcstat_displayheight = DEFAULT_DISPLAY_HEIGHT;
int pmcstat_displaywidth = DEFAULT_DISPLAY_WIDTH;
static int pmcstat_sockpair[NSOCKPAIRFD];
static int pmcstat_kq;
static kvm_t *pmcstat_kvm;
static struct kinfo_proc *pmcstat_plist;
struct pmcstat_args args;
static void
pmcstat_clone_event_descriptor(struct pmcstat_ev *ev, const cpuset_t *cpumask)
{
int cpu;
struct pmcstat_ev *ev_clone;
for (cpu = 0; cpu < CPU_SETSIZE; cpu++) {
if (!CPU_ISSET(cpu, cpumask))
continue;
if ((ev_clone = malloc(sizeof(*ev_clone))) == NULL)
errx(EX_SOFTWARE, "ERROR: Out of memory");
(void) memset(ev_clone, 0, sizeof(*ev_clone));
ev_clone->ev_count = ev->ev_count;
ev_clone->ev_cpu = cpu;
ev_clone->ev_cumulative = ev->ev_cumulative;
ev_clone->ev_flags = ev->ev_flags;
ev_clone->ev_mode = ev->ev_mode;
ev_clone->ev_name = strdup(ev->ev_name);
ev_clone->ev_pmcid = ev->ev_pmcid;
ev_clone->ev_saved = ev->ev_saved;
ev_clone->ev_spec = strdup(ev->ev_spec);
STAILQ_INSERT_TAIL(&args.pa_events, ev_clone, ev_next);
}
}
static void
pmcstat_get_cpumask(const char *cpuspec, cpuset_t *cpumask)
{
int cpu;
const char *s;
char *end;
CPU_ZERO(cpumask);
s = cpuspec;
do {
cpu = strtol(s, &end, 0);
if (cpu < 0 || end == s)
errx(EX_USAGE,
"ERROR: Illegal CPU specification \"%s\".",
cpuspec);
CPU_SET(cpu, cpumask);
s = end + strspn(end, ", \t");
} while (*s);
assert(!CPU_EMPTY(cpumask));
}
void
pmcstat_attach_pmcs(void)
{
struct pmcstat_ev *ev;
struct pmcstat_target *pt;
int count;
/* Attach all process PMCs to target processes. */
count = 0;
STAILQ_FOREACH(ev, &args.pa_events, ev_next) {
if (PMC_IS_SYSTEM_MODE(ev->ev_mode))
continue;
SLIST_FOREACH(pt, &args.pa_targets, pt_next)
if (pmc_attach(ev->ev_pmcid, pt->pt_pid) == 0)
count++;
else if (errno != ESRCH)
err(EX_OSERR,
"ERROR: cannot attach pmc \"%s\" to process %d",
ev->ev_name, (int)pt->pt_pid);
}
if (count == 0)
errx(EX_DATAERR, "ERROR: No processes were attached to.");
}
void
pmcstat_cleanup(void)
{
struct pmcstat_ev *ev, *tmp;
/* release allocated PMCs. */
STAILQ_FOREACH_SAFE(ev, &args.pa_events, ev_next, tmp)
if (ev->ev_pmcid != PMC_ID_INVALID) {
if (pmc_stop(ev->ev_pmcid) < 0)
err(EX_OSERR, "ERROR: cannot stop pmc 0x%x \"%s\"",
ev->ev_pmcid, ev->ev_name);
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(&args.pa_events, ev, pmcstat_ev, ev_next);
free(ev);
}
/* de-configure the log file if present. */
if (args.pa_flags & (FLAG_HAS_PIPE | FLAG_HAS_OUTPUT_LOGFILE))
(void) pmc_configure_logfile(-1);
if (args.pa_logparser) {
pmclog_close(args.pa_logparser);
args.pa_logparser = NULL;
}
pmcstat_shutdown_logging();
}
void
pmcstat_create_process(void)
{
char token;
pid_t pid;
struct kevent kev;
struct pmcstat_target *pt;
if (socketpair(AF_UNIX, SOCK_STREAM, 0, pmcstat_sockpair) < 0)
err(EX_OSERR, "ERROR: cannot create socket pair");
switch (pid = fork()) {
case -1:
err(EX_OSERR, "ERROR: cannot fork");
/*NOTREACHED*/
case 0: /* child */
(void) close(pmcstat_sockpair[PARENTSOCKET]);
/* Write a token to tell our parent we've started executing. */
if (write(pmcstat_sockpair[CHILDSOCKET], "+", 1) != 1)
err(EX_OSERR, "ERROR (child): cannot write token");
/* Wait for our parent to signal us to start. */
if (read(pmcstat_sockpair[CHILDSOCKET], &token, 1) < 0)
err(EX_OSERR, "ERROR (child): cannot read token");
(void) close(pmcstat_sockpair[CHILDSOCKET]);
/* exec() the program requested */
execvp(*args.pa_argv, args.pa_argv);
/* and if that fails, notify the parent */
kill(getppid(), SIGCHLD);
err(EX_OSERR, "ERROR: execvp \"%s\" failed", *args.pa_argv);
/*NOTREACHED*/
default: /* parent */
(void) close(pmcstat_sockpair[CHILDSOCKET]);
break;
}
/* Ask to be notified via a kevent when the target process exits. */
EV_SET(&kev, 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", pid);
if ((pt = malloc(sizeof(*pt))) == NULL)
errx(EX_SOFTWARE, "ERROR: Out of memory.");
pt->pt_pid = pid;
SLIST_INSERT_HEAD(&args.pa_targets, pt, pt_next);
/* Wait for the child to signal that its ready to go. */
if (read(pmcstat_sockpair[PARENTSOCKET], &token, 1) < 0)
err(EX_OSERR, "ERROR (parent): cannot read token");
return;
}
void
pmcstat_find_targets(const char *spec)
{
int n, nproc, pid, rv;
struct pmcstat_target *pt;
char errbuf[_POSIX2_LINE_MAX], *end;
static struct kinfo_proc *kp;
regex_t reg;
regmatch_t regmatch;
/* First check if we've been given a process id. */
pid = strtol(spec, &end, 0);
if (end != spec && pid >= 0) {
if ((pt = malloc(sizeof(*pt))) == NULL)
goto outofmemory;
pt->pt_pid = pid;
SLIST_INSERT_HEAD(&args.pa_targets, pt, pt_next);
return;
}
/* Otherwise treat arg as a regular expression naming processes. */
if (pmcstat_kvm == NULL) {
if ((pmcstat_kvm = kvm_openfiles(NULL, "/dev/null", NULL, 0,
errbuf)) == NULL)
err(EX_OSERR, "ERROR: Cannot open kernel \"%s\"",
errbuf);
if ((pmcstat_plist = kvm_getprocs(pmcstat_kvm, KERN_PROC_PROC,
0, &nproc)) == NULL)
err(EX_OSERR, "ERROR: Cannot get process list: %s",
kvm_geterr(pmcstat_kvm));
} else
nproc = 0;
if ((rv = regcomp(&reg, spec, REG_EXTENDED|REG_NOSUB)) != 0) {
regerror(rv, &reg, errbuf, sizeof(errbuf));
err(EX_DATAERR, "ERROR: Failed to compile regex \"%s\": %s",
spec, errbuf);
}
for (n = 0, kp = pmcstat_plist; n < nproc; n++, kp++) {
if ((rv = regexec(&reg, kp->ki_comm, 1, &regmatch, 0)) == 0) {
if ((pt = malloc(sizeof(*pt))) == NULL)
goto outofmemory;
pt->pt_pid = kp->ki_pid;
SLIST_INSERT_HEAD(&args.pa_targets, pt, pt_next);
} else if (rv != REG_NOMATCH) {
regerror(rv, &reg, errbuf, sizeof(errbuf));
errx(EX_SOFTWARE, "ERROR: Regex evalation failed: %s",
errbuf);
}
}
regfree(&reg);
return;
outofmemory:
errx(EX_SOFTWARE, "Out of memory.");
/*NOTREACHED*/
}
void
pmcstat_kill_process(void)
{
struct pmcstat_target *pt;
assert(args.pa_flags & FLAG_HAS_COMMANDLINE);
/*
* If a command line was specified, it would be the very first
* in the list, before any other processes specified by -t.
*/
pt = SLIST_FIRST(&args.pa_targets);
assert(pt != NULL);
if (kill(pt->pt_pid, SIGINT) != 0)
err(EX_OSERR, "ERROR: cannot signal child process");
}
void
pmcstat_start_pmcs(void)
{
struct pmcstat_ev *ev;
STAILQ_FOREACH(ev, &args.pa_events, 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();
exit(EX_OSERR);
}
}
}
void
pmcstat_print_headers(void)
{
struct pmcstat_ev *ev;
int c, w;
(void) fprintf(args.pa_printfile, PRINT_HEADER_PREFIX);
STAILQ_FOREACH(ev, &args.pa_events, 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(args.pa_printfile, "%*s",
ev->ev_fieldskip, "");
w = ev->ev_fieldwidth - ev->ev_fieldskip - 2;
if (c == 's')
(void) fprintf(args.pa_printfile, "s/%02d/%-*s ",
ev->ev_cpu, w-3, ev->ev_name);
else
(void) fprintf(args.pa_printfile, "p/%*s ", w,
ev->ev_name);
}
(void) fflush(args.pa_printfile);
}
void
pmcstat_print_counters(void)
{
int extra_width;
struct pmcstat_ev *ev;
pmc_value_t value;
extra_width = sizeof(PRINT_HEADER_PREFIX) - 1;
STAILQ_FOREACH(ev, &args.pa_events, 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(args.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(args.pa_printfile);
}
/*
* Print output
*/
void
pmcstat_print_pmcs(void)
{
static int linecount = 0;
/* check if we need to print a header line */
if (++linecount > pmcstat_displayheight) {
(void) fprintf(args.pa_printfile, "\n");
linecount = 1;
}
if (linecount == 1)
pmcstat_print_headers();
(void) fprintf(args.pa_printfile, "\n");
pmcstat_print_counters();
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_start_process(void)
{
/* Signal the child to proceed. */
if (write(pmcstat_sockpair[PARENTSOCKET], "!", 1) != 1)
err(EX_OSERR, "ERROR (parent): write of token failed");
(void) close(pmcstat_sockpair[PARENTSOCKET]);
}
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 -F file\t write a system-wide callgraph (Kcachegrind format)"
" to \"file\"\n"
"\t -G file\t write a system-wide callgraph to \"file\"\n"
"\t -M file\t print executable/gmon file map to \"file\"\n"
"\t -N\t\t (toggle) capture callchains\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 -T\t\t start in top mode\n"
"\t -W\t\t (toggle) show counts per context switch\n"
"\t -a file\t print sampled PCs and callgraph to \"file\"\n"
"\t -c cpu-list\t set cpus for subsequent system-wide PMCs\n"
"\t -d\t\t (toggle) track descendants\n"
"\t -e\t\t use wide history counter for gprof(1) output\n"
"\t -f spec\t pass \"spec\" to as plugin option\n"
"\t -g\t\t produce gprof(1) compatible profiles\n"
"\t -k dir\t\t set the path to the kernel\n"
"\t -l secs\t set duration time\n"
"\t -m file\t print sampled PCs to \"file\"\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 -q\t\t suppress verbosity\n"
"\t -r fsroot\t specify FS root directory\n"
"\t -s spec\t allocate a system-wide counting PMC\n"
"\t -t process-spec attach to running processes matching "
"\"process-spec\"\n"
"\t -v\t\t increase verbosity\n"
"\t -w secs\t set printing time interval\n"
"\t -z depth\t limit callchain display depth"
);
}
/*
* At exit handler for top mode
*/
void
pmcstat_topexit(void)
{
if (!args.pa_toptty)
return;
/*
* Shutdown ncurses.
*/
clrtoeol();
refresh();
endwin();
}
/*
* Main
*/
int
main(int argc, char **argv)
{
cpuset_t cpumask, rootmask;
double interval;
double duration;
int option, npmc;
int c, check_driver_stats, current_sampling_count;
int do_callchain, do_descendants, do_logproccsw, do_logprocexit;
int do_print, do_read;
size_t len;
int graphdepth;
int pipefd[2], rfd;
int use_cumulative_counts;
short cf, cb;
char *end, *tmp;
const char *errmsg, *graphfilename;
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;
char buffer[PATH_MAX];
check_driver_stats = 0;
current_sampling_count = DEFAULT_SAMPLE_COUNT;
do_callchain = 1;
do_descendants = 0;
do_logproccsw = 0;
do_logprocexit = 0;
use_cumulative_counts = 0;
graphfilename = "-";
args.pa_required = 0;
args.pa_flags = 0;
args.pa_verbosity = 1;
args.pa_logfd = -1;
args.pa_fsroot = "";
args.pa_samplesdir = ".";
args.pa_printfile = stderr;
args.pa_graphdepth = DEFAULT_CALLGRAPH_DEPTH;
args.pa_graphfile = NULL;
args.pa_interval = DEFAULT_WAIT_INTERVAL;
args.pa_mapfilename = NULL;
args.pa_inputpath = NULL;
args.pa_outputpath = NULL;
args.pa_pplugin = PMCSTAT_PL_NONE;
args.pa_plugin = PMCSTAT_PL_NONE;
args.pa_ctdumpinstr = 1;
args.pa_topmode = PMCSTAT_TOP_DELTA;
args.pa_toptty = 0;
args.pa_topcolor = 0;
args.pa_mergepmc = 0;
args.pa_duration = 0.0;
STAILQ_INIT(&args.pa_events);
SLIST_INIT(&args.pa_targets);
bzero(&ds_start, sizeof(ds_start));
bzero(&ds_end, sizeof(ds_end));
ev = NULL;
CPU_ZERO(&cpumask);
/* Default to using the running system kernel. */
len = 0;
if (sysctlbyname("kern.bootfile", NULL, &len, NULL, 0) == -1)
err(EX_OSERR, "ERROR: Cannot determine path of running kernel");
args.pa_kernel = malloc(len + 1);
if (sysctlbyname("kern.bootfile", args.pa_kernel, &len, NULL, 0) == -1)
err(EX_OSERR, "ERROR: Cannot determine path of running kernel");
/*
* The initial CPU mask specifies the root mask of this process
* which is usually all CPUs in the system.
*/
if (cpuset_getaffinity(CPU_LEVEL_ROOT, CPU_WHICH_PID, -1,
sizeof(rootmask), &rootmask) == -1)
err(EX_OSERR, "ERROR: Cannot determine the root set of CPUs");
CPU_COPY(&rootmask, &cpumask);
while ((option = getopt(argc, argv,
"CD:EF:G:M:NO:P:R:S:TWa:c:def:gk:l:m:n:o:p:qr:s:t:vw:z:")) != -1)
switch (option) {
case 'a': /* Annotate + callgraph */
args.pa_flags |= FLAG_DO_ANNOTATE;
args.pa_plugin = PMCSTAT_PL_ANNOTATE_CG;
graphfilename = optarg;
break;
case 'C': /* cumulative values */
use_cumulative_counts = !use_cumulative_counts;
args.pa_required |= FLAG_HAS_COUNTING_PMCS;
break;
case 'c': /* CPU */
if (optarg[0] == '*' && optarg[1] == '\0')
CPU_COPY(&rootmask, &cpumask);
else
pmcstat_get_cpumask(optarg, &cpumask);
args.pa_flags |= FLAGS_HAS_CPUMASK;
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 'e': /* wide gprof metrics */
args.pa_flags |= FLAG_DO_WIDE_GPROF_HC;
break;
case 'F': /* produce a system-wide calltree */
args.pa_flags |= FLAG_DO_CALLGRAPHS;
args.pa_plugin = PMCSTAT_PL_CALLTREE;
graphfilename = optarg;
break;
case 'f': /* plugins options */
if (args.pa_plugin == PMCSTAT_PL_NONE)
err(EX_USAGE, "ERROR: Need -g/-G/-m/-T.");
pmcstat_pluginconfigure_log(optarg);
break;
case 'G': /* produce a system-wide callgraph */
args.pa_flags |= FLAG_DO_CALLGRAPHS;
args.pa_plugin = PMCSTAT_PL_CALLGRAPH;
graphfilename = optarg;
break;
case 'g': /* produce gprof compatible profiles */
args.pa_flags |= FLAG_DO_GPROF;
args.pa_pplugin = PMCSTAT_PL_CALLGRAPH;
args.pa_plugin = PMCSTAT_PL_GPROF;
break;
case 'k': /* pathname to the kernel */
free(args.pa_kernel);
args.pa_kernel = strdup(optarg);
args.pa_required |= FLAG_DO_ANALYSIS;
args.pa_flags |= FLAG_HAS_KERNELPATH;
break;
case 'l': /* time duration in seconds */
duration = strtod(optarg, &end);
if (*end != '\0' || duration <= 0)
errx(EX_USAGE, "ERROR: Illegal duration time "
"value \"%s\".", optarg);
args.pa_flags |= FLAG_HAS_DURATION;
args.pa_duration = duration;
break;
case 'm':
args.pa_flags |= FLAG_DO_ANNOTATE;
args.pa_plugin = PMCSTAT_PL_ANNOTATE;
graphfilename = optarg;
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 'M': /* mapfile */
args.pa_mapfilename = optarg;
break;
case 'N':
do_callchain = !do_callchain;
args.pa_required |= FLAG_HAS_SAMPLING_PMCS;
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_TARGET);
}
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 = CPU_FFS(&cpumask) - 1;
else
ev->ev_cpu = PMC_CPU_ANY;
ev->ev_flags = 0;
if (do_callchain)
ev->ev_flags |= PMC_F_CALLCHAIN;
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_events, ev, ev_next);
if (option == 's' || option == 'S') {
CPU_CLR(ev->ev_cpu, &cpumask);
pmcstat_clone_event_descriptor(ev, &cpumask);
CPU_SET(ev->ev_cpu, &cpumask);
}
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 &&
args.pa_printfile != stdout &&
args.pa_printfile != stderr)
(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 'q': /* quiet mode */
args.pa_verbosity = 0;
break;
case 'r': /* root FS path */
args.pa_fsroot = optarg;
break;
case 'R': /* read an existing log file */
if (args.pa_inputpath != 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 or process name */
pmcstat_find_targets(optarg);
args.pa_flags |= FLAG_HAS_TARGET;
args.pa_required |= FLAG_HAS_PROCESS_PMCS;
break;
case 'T': /* top mode */
args.pa_flags |= FLAG_DO_TOP;
args.pa_plugin = PMCSTAT_PL_CALLGRAPH;
args.pa_ctdumpinstr = 0;
args.pa_mergepmc = 1;
if (args.pa_printfile == stderr)
args.pa_printfile = stdout;
break;
case 'v': /* verbose */
args.pa_verbosity++;
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 '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 'z':
graphdepth = strtod(optarg, &end);
if (*end != '\0' || graphdepth <= 0)
errx(EX_USAGE,
"ERROR: Illegal callchain depth \"%s\".",
optarg);
args.pa_graphdepth = graphdepth;
args.pa_required |= FLAG_DO_CALLGRAPHS;
break;
case '?':
default:
pmcstat_show_usage();
break;
}
args.pa_argc = (argc -= optind);
args.pa_argv = (argv += optind);
/* If we read from logfile and no specified CPU mask use
* the maximum CPU count.
*/
if ((args.pa_flags & FLAG_READ_LOGFILE) &&
(args.pa_flags & FLAGS_HAS_CPUMASK) == 0)
CPU_FILL(&cpumask);
args.pa_cpumask = cpumask; /* For selecting CPUs using -R. */
if (argc) /* command line present */
args.pa_flags |= FLAG_HAS_COMMANDLINE;
if (args.pa_flags & (FLAG_DO_GPROF | FLAG_DO_CALLGRAPHS |
FLAG_DO_ANNOTATE | FLAG_DO_TOP))
args.pa_flags |= FLAG_DO_ANALYSIS;
/*
* 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.");
/* disallow -T and -l together */
if ((args.pa_flags & FLAG_HAS_DURATION) &&
(args.pa_flags & FLAG_DO_TOP))
errx(EX_USAGE, "ERROR: options -T and -l are mutually "
"exclusive.");
/* -a and -m require -R */
if (args.pa_flags & FLAG_DO_ANNOTATE && args.pa_inputpath == NULL)
errx(EX_USAGE, "ERROR: option %s requires an input file",
args.pa_plugin == PMCSTAT_PL_ANNOTATE ? "-m" : "-a");
/* -m option is not allowed combined with -g or -G. */
if (args.pa_flags & FLAG_DO_ANNOTATE &&
args.pa_flags & (FLAG_DO_GPROF | FLAG_DO_CALLGRAPHS))
errx(EX_USAGE,
"ERROR: option -m and -g | -G 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_TARGET)
errmsg = "option -t";
else if (!STAILQ_EMPTY(&args.pa_events))
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_events))
/* 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_TARGET) &&
(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_TARGET)) == 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_TARGET)) &&
(args.pa_flags & (FLAG_HAS_COMMANDLINE | FLAG_HAS_TARGET)) == 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 with no system mode PMCs or logfile. */
if ((args.pa_required & FLAG_HAS_SYSTEM_PMCS) &&
(args.pa_flags & FLAG_HAS_SYSTEM_PMCS) == 0 &&
(args.pa_flags & FLAG_READ_LOGFILE) == 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 and -o 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, -n and -O require at least one sampling mode PMC to be specified."
);
/* check if -g/-G/-m/-T are being used correctly */
if ((args.pa_flags & FLAG_DO_ANALYSIS) &&
!(args.pa_flags & (FLAG_HAS_SAMPLING_PMCS|FLAG_READ_LOGFILE)))
errx(EX_USAGE,
"ERROR: options -g/-G/-m/-T require sampling PMCs or -R to be specified."
);
/* check if -e was specified without -g */
if ((args.pa_flags & FLAG_DO_WIDE_GPROF_HC) &&
!(args.pa_flags & FLAG_DO_GPROF))
errx(EX_USAGE,
"ERROR: option -e requires gprof mode 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."
);
/* -k kernel path require -g/-G/-m/-T or -R */
if ((args.pa_flags & FLAG_HAS_KERNELPATH) &&
(args.pa_flags & FLAG_DO_ANALYSIS) == 0 &&
(args.pa_flags & FLAG_READ_LOGFILE) == 0)
errx(EX_USAGE, "ERROR: option -k is only used with -g/-R/-m/-T.");
/* -D only applies to gprof output mode (-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.");
/* -M mapfile requires -g or -R */
if (args.pa_mapfilename != NULL &&
(args.pa_flags & FLAG_DO_GPROF) == 0 &&
(args.pa_flags & FLAG_READ_LOGFILE) == 0)
errx(EX_USAGE, "ERROR: option -M is only used with -g/-R.");
/*
* 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_flags & FLAG_HAS_OUTPUT_LOGFILE) == 0))
errx(EX_USAGE,
"ERROR: option -O is required if counting and sampling PMCs are specified together."
);
/*
* Check if 'kerneldir' refers to a file rather than a
* directory. If so, use `dirname path` to determine the
* kernel directory.
*/
(void) snprintf(buffer, sizeof(buffer), "%s%s", args.pa_fsroot,
args.pa_kernel);
if (stat(buffer, &sb) < 0)
err(EX_OSERR, "ERROR: Cannot locate kernel \"%s\"",
buffer);
if (!S_ISREG(sb.st_mode) && !S_ISDIR(sb.st_mode))
errx(EX_USAGE, "ERROR: \"%s\": Unsupported file type.",
buffer);
if (!S_ISDIR(sb.st_mode)) {
tmp = args.pa_kernel;
args.pa_kernel = strdup(dirname(args.pa_kernel));
free(tmp);
(void) snprintf(buffer, sizeof(buffer), "%s%s",
args.pa_fsroot, args.pa_kernel);
if (stat(buffer, &sb) < 0)
err(EX_OSERR, "ERROR: Cannot stat \"%s\"",
buffer);
if (!S_ISDIR(sb.st_mode))
errx(EX_USAGE,
"ERROR: \"%s\" is not a directory.",
buffer);
}
/*
* If we have a callgraph be created, select the outputfile.
*/
if (args.pa_flags & FLAG_DO_CALLGRAPHS) {
if (strcmp(graphfilename, "-") == 0)
args.pa_graphfile = args.pa_printfile;
else {
args.pa_graphfile = fopen(graphfilename, "w");
if (args.pa_graphfile == NULL)
err(EX_OSERR,
"ERROR: cannot open \"%s\" for writing",
graphfilename);
}
}
if (args.pa_flags & FLAG_DO_ANNOTATE) {
args.pa_graphfile = fopen(graphfilename, "w");
if (args.pa_graphfile == NULL)
err(EX_OSERR, "ERROR: cannot open \"%s\" for writing",
graphfilename);
}
/* if we've been asked to process a log file, skip init */
if ((args.pa_flags & FLAG_READ_LOGFILE) == 0) {
if (pmc_init() < 0)
err(EX_UNAVAILABLE,
"ERROR: Initialization of the pmc(3) library failed"
);
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");
/* Setup the logfile as the source. */
if (args.pa_flags & FLAG_READ_LOGFILE) {
/*
* Print the log in textual form if we haven't been
* asked to generate profiling information.
*/
if ((args.pa_flags & FLAG_DO_ANALYSIS) == 0)
args.pa_flags |= FLAG_DO_PRINT;
pmcstat_initialize_logging();
rfd = pmcstat_open_log(args.pa_inputpath,
PMCSTAT_OPEN_FOR_READ);
if ((args.pa_logparser = pmclog_open(rfd)) == NULL)
err(EX_OSERR, "ERROR: Cannot create parser");
if (fcntl(rfd, F_SETFL, O_NONBLOCK) < 0)
err(EX_OSERR, "ERROR: fcntl(2) failed");
EV_SET(&kev, rfd, EVFILT_READ, EV_ADD,
0, 0, NULL);
if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0)
err(EX_OSERR, "ERROR: Cannot register kevent");
}
/*
* 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)
args.pa_logfd = pmcstat_open_log(args.pa_outputpath,
PMCSTAT_OPEN_FOR_WRITE);
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;
if ((args.pa_flags & FLAG_DO_TOP) == 0)
args.pa_flags |= 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);
/*
if (args.pa_flags & FLAG_READ_LOGFILE) {
* Allocate PMCs.
*/
STAILQ_FOREACH(ev, &args.pa_events, 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_events, 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 (PMC_IS_SYSTEM_MODE(ev->ev_mode))
header_width += 3; /* 2 digit CPU number + '/' */
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;
pmcstat_displaywidth = ws.ws_col - 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");
args.pa_toptty = 1;
}
/*
* Listen to key input in top mode.
*/
if (args.pa_flags & FLAG_DO_TOP) {
EV_SET(&kev, fileno(stdin), EVFILT_READ, EV_ADD, 0, 0, NULL);
if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0)
err(EX_OSERR, "ERROR: Cannot register kevent");
}
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 or
* top mode plugin is active.
*/
if (((args.pa_flags & FLAG_HAS_COUNTING_PMCS) &&
(args.pa_required & FLAG_HAS_OUTPUT_LOGFILE) == 0) ||
(args.pa_flags & FLAG_DO_TOP)) {
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");
}
/*
* Setup a duration timer if we have sampling mode PMCs and
* a duration time is set
*/
if ((args.pa_flags & FLAG_HAS_SAMPLING_PMCS) &&
(args.pa_flags & FLAG_HAS_DURATION)) {
EV_SET(&kev, 0, EVFILT_TIMER, EV_ADD, 0,
args.pa_duration * 1000, NULL);
if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0)
err(EX_OSERR, "ERROR: Cannot register kevent for "
"time duration");
}
/* attach PMCs to the target process, starting it if specified */
if (args.pa_flags & FLAG_HAS_COMMANDLINE)
pmcstat_create_process();
if (check_driver_stats && pmc_get_driver_stats(&ds_start) < 0)
err(EX_OSERR, "ERROR: Cannot retrieve driver statistics");
/* Attach process pmcs to the target process. */
if (args.pa_flags & (FLAG_HAS_TARGET | FLAG_HAS_COMMANDLINE)) {
if (SLIST_EMPTY(&args.pa_targets))
errx(EX_DATAERR,
"ERROR: No matching target processes.");
if (args.pa_flags & FLAG_HAS_PROCESS_PMCS)
pmcstat_attach_pmcs();
if (pmcstat_kvm) {
kvm_close(pmcstat_kvm);
pmcstat_kvm = NULL;
}
}
/* start the pmcs */
pmcstat_start_pmcs();
/* start the (commandline) process if needed */
if (args.pa_flags & FLAG_HAS_COMMANDLINE)
pmcstat_start_process();
/* initialize logging */
pmcstat_initialize_logging();
/* 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");
/*
* Setup the top mode display.
*/
if (args.pa_flags & FLAG_DO_TOP) {
args.pa_flags &= ~FLAG_DO_PRINT;
if (args.pa_toptty) {
/*
* Init ncurses.
*/
initscr();
if(has_colors() == TRUE) {
args.pa_topcolor = 1;
start_color();
use_default_colors();
pair_content(0, &cf, &cb);
init_pair(1, COLOR_RED, cb);
init_pair(2, COLOR_YELLOW, cb);
init_pair(3, COLOR_GREEN, cb);
}
cbreak();
noecho();
nonl();
nodelay(stdscr, 1);
intrflush(stdscr, FALSE);
keypad(stdscr, TRUE);
clear();
/* Get terminal width / height with ncurses. */
getmaxyx(stdscr,
pmcstat_displayheight, pmcstat_displaywidth);
pmcstat_displayheight--; pmcstat_displaywidth--;
atexit(pmcstat_topexit);
}
}
/*
* loop till either the target process (if any) exits, or we
* are killed by a SIGINT or we reached the time duration.
*/
runstate = PMCSTAT_RUNNING;
do_print = do_read = 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 */
runstate = pmcstat_close_log();
do_print = 1;
break;
case EVFILT_READ: /* log file data is present */
if (kev.ident == (unsigned)fileno(stdin) &&
(args.pa_flags & FLAG_DO_TOP)) {
if (pmcstat_keypress_log())
runstate = pmcstat_close_log();
} else {
do_read = 0;
runstate = pmcstat_process_log();
}
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.
*/
runstate = pmcstat_close_log();
do_print = 1; /* print PMCs at exit */
} else if (kev.ident == SIGINT) {
/* Kill the child process if we started it */
if (args.pa_flags & FLAG_HAS_COMMANDLINE)
pmcstat_kill_process();
runstate = pmcstat_close_log();
} 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;
pmcstat_displaywidth = ws.ws_col - 1;
} else
assert(0);
break;
case EVFILT_TIMER:
/* time duration reached, exit */
if (args.pa_flags & FLAG_HAS_DURATION) {
runstate = PMCSTAT_FINISHED;
break;
}
/* print out counting PMCs */
if ((args.pa_flags & FLAG_DO_TOP) &&
pmc_flush_logfile() == 0)
do_read = 1;
do_print = 1;
break;
}
if (do_print && !do_read) {
if ((args.pa_required & FLAG_HAS_OUTPUT_LOGFILE) == 0) {
pmcstat_print_pmcs();
if (runstate == PMCSTAT_FINISHED &&
/* final newline */
(args.pa_flags & FLAG_DO_PRINT) == 0)
(void) fprintf(args.pa_printfile, "\n");
}
if (args.pa_flags & FLAG_DO_TOP)
pmcstat_display_log();
do_print = 0;
}
} while (runstate != PMCSTAT_FINISHED);
if ((args.pa_flags & FLAG_DO_TOP) && args.pa_toptty) {
pmcstat_topexit();
args.pa_toptty = 0;
}
/* flush any pending log entries */
if (args.pa_flags & (FLAG_HAS_OUTPUT_LOGFILE | FLAG_HAS_PIPE))
pmc_close_logfile();
pmcstat_cleanup();
free(args.pa_kernel);
/* 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 &&
args.pa_verbosity > 0)
warnx(
"WARNING: sampling was paused at least %u time%s.\n"
"Please consider tuning the \"kern.hwpmc.nsamples\" tunable.",
ds_end.pm_intr_bufferfull -
ds_start.pm_intr_bufferfull,
((ds_end.pm_intr_bufferfull -
ds_start.pm_intr_bufferfull) != 1) ? "s" : ""
);
if (ds_start.pm_buffer_requests_failed !=
ds_end.pm_buffer_requests_failed &&
args.pa_verbosity > 0)
warnx(
"WARNING: at least %u event%s were discarded while running.\n"
"Please consider tuning the \"kern.hwpmc.nbuffers\" tunable.",
ds_end.pm_buffer_requests_failed -
ds_start.pm_buffer_requests_failed,
((ds_end.pm_buffer_requests_failed -
ds_start.pm_buffer_requests_failed) != 1) ? "s" : ""
);
}
exit(EX_OK);
}
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