495 lines
15 KiB
C
495 lines
15 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2018, Matthew Macy
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/cpuset.h>
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#include <sys/event.h>
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#include <sys/queue.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/sysctl.h>
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#include <sys/time.h>
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#include <sys/ttycom.h>
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#include <sys/user.h>
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#include <sys/wait.h>
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#include <assert.h>
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#include <curses.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <getopt.h>
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#include <kvm.h>
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#include <libgen.h>
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#include <limits.h>
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#include <locale.h>
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#include <math.h>
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#include <pmc.h>
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#include <pmclog.h>
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#include <regex.h>
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#include <signal.h>
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#include <stdarg.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sysexits.h>
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#include <unistd.h>
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#include <libpmcstat.h>
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#include "cmd_pmc.h"
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/*
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* Return the frequency of the kernel's statistics clock.
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*/
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static int
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getstathz(void)
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{
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int mib[2];
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size_t size;
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struct clockinfo clockrate;
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mib[0] = CTL_KERN;
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mib[1] = KERN_CLOCKRATE;
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size = sizeof clockrate;
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if (sysctl(mib, 2, &clockrate, &size, NULL, 0) == -1)
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err(1, "sysctl kern.clockrate");
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return clockrate.stathz;
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}
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#define STAT_MODE_NPMCS 6
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#define FIXED_MODE_NPMCS 2
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static struct timespec before_ts;
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#define CYCLES 0
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#define INST 1
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#define BR 2
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#define IAP_START BR
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#define BR_MISS 3
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#define CACHE 4
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#define CACHE_MISS 5
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static const char *pmc_stat_mode_names[] = {
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"cycles",
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"instructions",
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"branches",
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"branch-misses",
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"cache-references",
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"cache-misses",
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};
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/* Common aliases for the desired stat counter */
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static const char *pmc_stat_mode_aliases[] = {
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"unhalted-cycles",
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"instructions",
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"branches",
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"branch-mispredicts",
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"LLC-REFERENCE",
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"LLC-MISSES",
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};
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static int pmcstat_sockpair[NSOCKPAIRFD];
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static void __dead2
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usage(void)
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{
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errx(EX_USAGE,
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"\t get basic stats from command line program\n"
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"\t -j <eventlist>, --events <eventlist> comma-delimited list of event specifiers\n"
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);
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}
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static void
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showtime(FILE *out, struct timespec *before, struct timespec *after,
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struct rusage *ru)
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{
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char decimal_point;
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uint64_t real, user, sys;
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(void)setlocale(LC_NUMERIC, "");
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decimal_point = localeconv()->decimal_point[0];
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after->tv_sec -= before->tv_sec;
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after->tv_nsec -= before->tv_nsec;
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if (after->tv_nsec < 0) {
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after->tv_sec--;
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after->tv_nsec += 1000000000;
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}
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real = (after->tv_sec * 1000000000 + after->tv_nsec) / 1000;
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user = ru->ru_utime.tv_sec * 1000000 + ru->ru_utime.tv_usec;
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sys = ru->ru_stime.tv_sec * 1000000 + ru->ru_stime.tv_usec;
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fprintf(out, "%13jd%c%02ld real\t\t\t#\t%2.02f%% cpu\n",
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(intmax_t)after->tv_sec, decimal_point,
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after->tv_nsec / 10000000, 100 * (double)(sys + user + 1) / (double)(real + 1));
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fprintf(out, "%13jd%c%02ld user\t\t\t#\t%2.2f%% cpu\n",
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(intmax_t)ru->ru_utime.tv_sec, decimal_point,
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ru->ru_utime.tv_usec / 10000, 100 * (double)(user + 1) / (double)(real + 1));
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fprintf(out, "%13jd%c%02ld sys\t\t\t#\t%2.02f%% cpu\n",
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(intmax_t)ru->ru_stime.tv_sec, decimal_point,
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ru->ru_stime.tv_usec / 10000, 100 * (double)(sys + 1) / (double)(real + 1));
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}
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static const char *stat_mode_cntrs[STAT_MODE_NPMCS];
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static const char *stat_mode_names[STAT_MODE_NPMCS];
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static void
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pmc_stat_setup_stat(int system_mode, const char *arg)
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{
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const char *new_cntrs[STAT_MODE_NPMCS];
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struct pmcstat_ev *ev;
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char *counters, *counter;
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int i, c, start, newcnt;
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cpuset_t cpumask, rootmask;
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if (cpuset_getaffinity(CPU_LEVEL_ROOT, CPU_WHICH_PID, -1,
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sizeof(rootmask), &rootmask) == -1)
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err(EX_OSERR, "ERROR: Cannot determine the root set of CPUs");
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CPU_COPY(&rootmask, &cpumask);
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if (system_mode && geteuid() != 0)
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errx(EX_USAGE, "ERROR: system mode counters can only be used as root");
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counters = NULL;
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for (i = 0; i < STAT_MODE_NPMCS; i++) {
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stat_mode_cntrs[i] = pmc_stat_mode_aliases[i];
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stat_mode_names[i] = pmc_stat_mode_names[i];
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}
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if (arg) {
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counters = strdup(arg);
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newcnt = 0;
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while ((counter = strsep(&counters, ",")) != NULL &&
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newcnt < STAT_MODE_NPMCS - IAP_START) {
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new_cntrs[newcnt++] = counter;
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if (pmc_pmu_sample_rate_get(counter) == DEFAULT_SAMPLE_COUNT)
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errx(EX_USAGE, "ERROR: %s not recognized on host", counter);
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}
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start = IAP_START + STAT_MODE_NPMCS - FIXED_MODE_NPMCS - newcnt;
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for (i = 0; i < newcnt; i++) {
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stat_mode_cntrs[start + i] = new_cntrs[i];
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stat_mode_names[start + i] = new_cntrs[i];
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}
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}
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if (system_mode)
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pmc_args.pa_flags |= FLAG_HAS_SYSTEM_PMCS;
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else
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pmc_args.pa_flags |= FLAG_HAS_PROCESS_PMCS;
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pmc_args.pa_flags |= FLAG_HAS_COUNTING_PMCS;
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pmc_args.pa_flags |= FLAG_HAS_COMMANDLINE | FLAG_HAS_TARGET;
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pmc_args.pa_flags |= FLAG_HAS_PIPE;
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pmc_args.pa_required |= FLAG_HAS_COMMANDLINE | FLAG_HAS_TARGET | FLAG_HAS_OUTPUT_LOGFILE;
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pmc_args.pa_outputpath = strdup("/dev/null");
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pmc_args.pa_logfd = pmcstat_open_log(pmc_args.pa_outputpath,
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PMCSTAT_OPEN_FOR_WRITE);
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for (i = 0; i < STAT_MODE_NPMCS; i++) {
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if ((ev = malloc(sizeof(*ev))) == NULL)
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errx(EX_SOFTWARE, "ERROR: Out of memory.");
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if (system_mode)
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ev->ev_mode = PMC_MODE_SC;
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else
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ev->ev_mode = PMC_MODE_TC;
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ev->ev_spec = strdup(stat_mode_cntrs[i]);
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if (ev->ev_spec == NULL)
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errx(EX_SOFTWARE, "ERROR: Out of memory.");
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c = strcspn(strdup(stat_mode_cntrs[i]), ", \t");
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ev->ev_name = malloc(c + 1);
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if (ev->ev_name == NULL)
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errx(EX_SOFTWARE, "ERROR: Out of memory.");
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(void)strncpy(ev->ev_name, stat_mode_cntrs[i], c);
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*(ev->ev_name + c) = '\0';
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ev->ev_count = -1;
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ev->ev_flags = 0;
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ev->ev_flags |= PMC_F_DESCENDANTS;
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ev->ev_cumulative = 1;
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ev->ev_saved = 0LL;
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ev->ev_pmcid = PMC_ID_INVALID;
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STAILQ_INSERT_TAIL(&pmc_args.pa_events, ev, ev_next);
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if (system_mode) {
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ev->ev_cpu = CPU_FFS(&cpumask) - 1;
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CPU_CLR(ev->ev_cpu, &cpumask);
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pmcstat_clone_event_descriptor(ev, &cpumask, &pmc_args);
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CPU_SET(ev->ev_cpu, &cpumask);
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} else
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ev->ev_cpu = PMC_CPU_ANY;
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}
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if (clock_gettime(CLOCK_MONOTONIC, &before_ts))
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err(1, "clock_gettime");
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}
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static void
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pmc_stat_print_stat(struct rusage *ru)
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{
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struct pmcstat_ev *ev;
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struct timespec after;
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uint64_t cvals[STAT_MODE_NPMCS];
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uint64_t ticks, value;
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int hz, i;
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if (ru) {
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hz = getstathz();
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ticks = hz * (ru->ru_utime.tv_sec + ru->ru_stime.tv_sec) +
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hz * (ru->ru_utime.tv_usec + ru->ru_stime.tv_usec) / 1000000;
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if (clock_gettime(CLOCK_MONOTONIC, &after))
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err(1, "clock_gettime");
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/*
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* If our round-off on the tick calculation still puts us at 0,
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* then always assume at least one tick.
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*/
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if (ticks == 0)
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ticks = 1;
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fprintf(pmc_args.pa_printfile, "%16ld %s\t\t#\t%02.03f M/sec\n",
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ru->ru_minflt, "page faults", ((double)ru->ru_minflt / (double)ticks) / hz);
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fprintf(pmc_args.pa_printfile, "%16ld %s\t\t#\t%02.03f M/sec\n",
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ru->ru_nvcsw, "voluntary csw", ((double)ru->ru_nvcsw / (double)ticks) / hz);
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fprintf(pmc_args.pa_printfile, "%16ld %s\t#\t%02.03f M/sec\n",
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ru->ru_nivcsw, "involuntary csw", ((double)ru->ru_nivcsw / (double)ticks) / hz);
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}
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bzero(&cvals, sizeof(cvals));
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STAILQ_FOREACH(ev, &pmc_args.pa_events, ev_next) {
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if (pmc_read(ev->ev_pmcid, &value) < 0)
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err(EX_OSERR, "ERROR: Cannot read pmc \"%s\"",
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ev->ev_name);
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for (i = 0; i < STAT_MODE_NPMCS; i++)
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if (strcmp(ev->ev_name, stat_mode_cntrs[i]) == 0)
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cvals[i] += value;
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}
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fprintf(pmc_args.pa_printfile, "%16jd %s\n", (uintmax_t)cvals[CYCLES], stat_mode_names[CYCLES]);
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fprintf(pmc_args.pa_printfile, "%16jd %s\t\t#\t%01.03f inst/cycle\n", (uintmax_t)cvals[INST], stat_mode_names[INST],
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(double)cvals[INST] / cvals[CYCLES]);
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fprintf(pmc_args.pa_printfile, "%16jd %s\n", (uintmax_t)cvals[BR], stat_mode_names[BR]);
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if (stat_mode_names[BR_MISS] == pmc_stat_mode_names[BR_MISS])
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fprintf(pmc_args.pa_printfile, "%16jd %s\t\t#\t%.03f%%\n",
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(uintmax_t)cvals[BR_MISS], stat_mode_names[BR_MISS],
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100 * ((double)cvals[BR_MISS] / cvals[BR]));
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else
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fprintf(pmc_args.pa_printfile, "%16jd %s\n",
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(uintmax_t)cvals[BR_MISS], stat_mode_names[BR_MISS]);
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fprintf(pmc_args.pa_printfile, "%16jd %s%s", (uintmax_t)cvals[CACHE], stat_mode_names[CACHE],
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stat_mode_names[CACHE] != pmc_stat_mode_names[CACHE] ? "\n" : "");
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if (stat_mode_names[CACHE] == pmc_stat_mode_names[CACHE])
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fprintf(pmc_args.pa_printfile, "\t#\t%.03f refs/inst\n",
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((double)cvals[CACHE] / cvals[INST]));
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fprintf(pmc_args.pa_printfile, "%16jd %s%s", (uintmax_t)cvals[CACHE_MISS], stat_mode_names[CACHE_MISS],
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stat_mode_names[CACHE_MISS] != pmc_stat_mode_names[CACHE_MISS] ? "\n" : "");
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if (stat_mode_names[CACHE_MISS] == pmc_stat_mode_names[CACHE_MISS])
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fprintf(pmc_args.pa_printfile, "\t\t#\t%.03f%%\n",
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100 * ((double)cvals[CACHE_MISS] / cvals[CACHE]));
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if (ru)
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showtime(pmc_args.pa_printfile, &before_ts, &after, ru);
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}
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static struct option longopts[] = {
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{"events", required_argument, NULL, 'j'},
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{NULL, 0, NULL, 0}
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};
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static int
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pmc_stat_internal(int argc, char **argv, int system_mode)
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{
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char *event, *r;
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struct sigaction sa;
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struct kevent kev;
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struct rusage ru;
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struct winsize ws;
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struct pmcstat_ev *ev;
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int c, option, runstate;
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int waitstatus, ru_valid, do_debug;
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do_debug = ru_valid = 0;
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r = event = NULL;
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while ((option = getopt_long(argc, argv, "dj:", longopts, NULL)) != -1) {
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switch (option) {
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case 'j':
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r = event = strdup(optarg);
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break;
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case 'd':
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do_debug = 1;
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break;
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case '?':
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default:
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usage();
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}
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}
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pmc_args.pa_argc = (argc -= optind);
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pmc_args.pa_argv = (argv += optind);
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if (argc == 0)
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usage();
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pmc_args.pa_flags |= FLAG_HAS_COMMANDLINE;
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pmc_stat_setup_stat(system_mode, event);
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free(r);
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bzero(&ru, sizeof(ru));
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EV_SET(&kev, SIGINT, EVFILT_SIGNAL, EV_ADD, 0, 0, NULL);
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if (kevent(pmc_kq, &kev, 1, NULL, 0, NULL) < 0)
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err(EX_OSERR, "ERROR: Cannot register kevent for SIGINT");
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EV_SET(&kev, SIGIO, EVFILT_SIGNAL, EV_ADD, 0, 0, NULL);
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if (kevent(pmc_kq, &kev, 1, NULL, 0, NULL) < 0)
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err(EX_OSERR, "ERROR: Cannot register kevent for SIGIO");
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EV_SET(&kev, 0, EVFILT_TIMER, EV_ADD, 0, 1000, NULL);
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if (kevent(pmc_kq, &kev, 1, NULL, 0, NULL) < 0)
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err(EX_OSERR,
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"ERROR: Cannot register kevent for timer");
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STAILQ_FOREACH(ev, &pmc_args.pa_events, ev_next) {
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if (pmc_allocate(ev->ev_spec, ev->ev_mode,
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ev->ev_flags, ev->ev_cpu, &ev->ev_pmcid, ev->ev_count) < 0)
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err(EX_OSERR,
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"ERROR: Cannot allocate %s-mode pmc with specification \"%s\"",
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PMC_IS_SYSTEM_MODE(ev->ev_mode) ?
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"system" : "process", ev->ev_spec);
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if (PMC_IS_SAMPLING_MODE(ev->ev_mode) &&
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pmc_set(ev->ev_pmcid, ev->ev_count) < 0)
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err(EX_OSERR,
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"ERROR: Cannot set sampling count for PMC \"%s\"",
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ev->ev_name);
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}
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/*
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* An exec() failure of a forked child is signalled by the
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* child sending the parent a SIGCHLD. We don't register an
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* actual signal handler for SIGCHLD, but instead use our
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* kqueue to pick up the signal.
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*/
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EV_SET(&kev, SIGCHLD, EVFILT_SIGNAL, EV_ADD, 0, 0, NULL);
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if (kevent(pmc_kq, &kev, 1, NULL, 0, NULL) < 0)
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err(EX_OSERR, "ERROR: Cannot register kevent for SIGCHLD");
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pmcstat_create_process(pmcstat_sockpair, &pmc_args, pmc_kq);
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if (SLIST_EMPTY(&pmc_args.pa_targets))
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errx(EX_DATAERR,
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"ERROR: No matching target processes.");
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if (pmc_args.pa_flags & FLAG_HAS_PROCESS_PMCS)
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pmcstat_attach_pmcs(&pmc_args);
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/* start the pmcs */
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pmc_util_start_pmcs(&pmc_args);
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/* start the (commandline) process if needed */
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pmcstat_start_process(pmcstat_sockpair);
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/* Handle SIGINT using the kqueue loop */
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sa.sa_handler = SIG_IGN;
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sa.sa_flags = 0;
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(void)sigemptyset(&sa.sa_mask);
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if (sigaction(SIGINT, &sa, NULL) < 0)
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err(EX_OSERR, "ERROR: Cannot install signal handler");
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/*
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* loop till either the target process (if any) exits, or we
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* are killed by a SIGINT or we reached the time duration.
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*/
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runstate = PMCSTAT_RUNNING;
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do {
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if ((c = kevent(pmc_kq, NULL, 0, &kev, 1, NULL)) <= 0) {
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if (errno != EINTR)
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err(EX_OSERR, "ERROR: kevent failed");
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else
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continue;
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}
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if (kev.flags & EV_ERROR)
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errc(EX_OSERR, kev.data, "ERROR: kevent failed");
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switch (kev.filter) {
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case EVFILT_PROC: /* target has exited */
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if (wait4(pmc_util_get_pid(&pmc_args), &waitstatus, 0, &ru) > 0) {
|
|
getrusage(RUSAGE_CHILDREN, &ru);
|
|
ru_valid = 1;
|
|
}
|
|
break;
|
|
|
|
case EVFILT_READ: /* log file data is present */
|
|
break;
|
|
case EVFILT_TIMER:
|
|
if (do_debug)
|
|
pmc_stat_print_stat(NULL);
|
|
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 (wait4(pmc_util_get_pid(&pmc_args), &waitstatus, 0, &ru) > 0) {
|
|
getrusage(RUSAGE_CHILDREN, &ru);
|
|
ru_valid = 1;
|
|
}
|
|
runstate = pmcstat_close_log(&pmc_args);
|
|
} else if (kev.ident == SIGINT) {
|
|
/* Kill the child process if we started it */
|
|
if (pmc_args.pa_flags & FLAG_HAS_COMMANDLINE)
|
|
pmc_util_kill_process(&pmc_args);
|
|
runstate = pmcstat_close_log(&pmc_args);
|
|
} else if (kev.ident == SIGWINCH) {
|
|
if (ioctl(fileno(pmc_args.pa_printfile),
|
|
TIOCGWINSZ, &ws) < 0)
|
|
err(EX_OSERR,
|
|
"ERROR: Cannot determine window size");
|
|
pmc_displayheight = ws.ws_row - 1;
|
|
pmc_displaywidth = ws.ws_col - 1;
|
|
} else
|
|
assert(0);
|
|
|
|
break;
|
|
}
|
|
} while (runstate != PMCSTAT_FINISHED);
|
|
if (!ru_valid)
|
|
warnx("couldn't get rusage");
|
|
pmc_stat_print_stat(&ru);
|
|
pmc_util_cleanup(&pmc_args);
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
cmd_pmc_stat(int argc, char **argv)
|
|
{
|
|
return (pmc_stat_internal(argc, argv, 0));
|
|
}
|
|
|
|
int
|
|
cmd_pmc_stat_system(int argc, char **argv)
|
|
{
|
|
return (pmc_stat_internal(argc, argv, 1));
|
|
}
|