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/*
* High resolution timer test software
*
* (C) 2013 Clark Williams <williams@redhat.com>
* (C) 2013 John Kacur <jkacur@redhat.com>
* (C) 2008-2012 Clark Williams <williams@redhat.com>
* (C) 2005-2007 Thomas Gleixner <tglx@linutronix.de>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License Version
* 2 as published by the Free Software Foundation.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdarg.h>
#include <unistd.h>
#include <fcntl.h>
#include <getopt.h>
#include <pthread.h>
#include <signal.h>
#include <sched.h>
#include <string.h>
#include <time.h>
#include <errno.h>
#include <limits.h>
#include <linux/unistd.h>
#include <sys/prctl.h>
#include <sys/stat.h>
#include <sys/sysinfo.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/utsname.h>
#include <sys/mman.h>
#include <sys/syscall.h>
#include "rt_numa.h"
#include "rt-utils.h"
#include <bionic.h>
#define DEFAULT_INTERVAL 1000
#define DEFAULT_DISTANCE 500
#ifndef SCHED_IDLE
#define SCHED_IDLE 5
#endif
#ifndef SCHED_NORMAL
#define SCHED_NORMAL SCHED_OTHER
#endif
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
#define sigev_notify_thread_id _sigev_un._tid
#ifdef __UCLIBC__
#define MAKE_PROCESS_CPUCLOCK(pid, clock) \
((~(clockid_t) (pid) << 3) | (clockid_t) (clock))
#define CPUCLOCK_SCHED 2
static int clock_nanosleep(clockid_t clock_id, int flags, const struct timespec *req,
struct timespec *rem)
{
if (clock_id == CLOCK_THREAD_CPUTIME_ID)
return -EINVAL;
if (clock_id == CLOCK_PROCESS_CPUTIME_ID)
clock_id = MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED);
return syscall(__NR_clock_nanosleep, clock_id, flags, req, rem);
}
int sched_setaffinity (__pid_t __pid, size_t __cpusetsize,
__const cpu_set_t *__cpuset)
{
return -EINVAL;
}
#undef CPU_SET
#undef CPU_ZERO
#define CPU_SET(cpu, cpusetp)
#define CPU_ZERO(cpusetp)
#else
extern int clock_nanosleep(clockid_t __clock_id, int __flags,
__const struct timespec *__req,
struct timespec *__rem);
#endif /* __UCLIBC__ */
#define USEC_PER_SEC 1000000
#define NSEC_PER_SEC 1000000000
#define HIST_MAX 1000000
#define MODE_CYCLIC 0
#define MODE_CLOCK_NANOSLEEP 1
#define MODE_SYS_ITIMER 2
#define MODE_SYS_NANOSLEEP 3
#define MODE_SYS_OFFSET 2
#define TIMER_RELTIME 0
/* Must be power of 2 ! */
#define VALBUF_SIZE 16384
#define KVARS 32
#define KVARNAMELEN 32
#define KVALUELEN 32
#if (defined(__i386__) || defined(__x86_64__))
#define ARCH_HAS_SMI_COUNTER
#endif
#define MSR_SMI_COUNT 0x00000034
#define MSR_SMI_COUNT_MASK 0xFFFFFFFF
static char *policyname(int policy);
/* Struct to transfer parameters to the thread */
struct thread_param {
int prio;
int policy;
int mode;
int timermode;
int signal;
int clock;
unsigned long max_cycles;
struct thread_stat *stats;
int bufmsk;
unsigned long interval;
int cpu;
int node;
int tnum;
int msr_fd;
};
/* Struct for statistics */
struct thread_stat {
unsigned long cycles;
unsigned long cyclesread;
long min;
long max;
long act;
double avg;
long *values;
long *smis;
long *hist_array;
long *outliers;
pthread_t thread;
int threadstarted;
int tid;
long reduce;
long redmax;
long cycleofmax;
long hist_overflow;
long num_outliers;
unsigned long smi_count;
};
static pthread_mutex_t trigger_lock = PTHREAD_MUTEX_INITIALIZER;
static int trigger = 0; /* Record spikes > trigger, 0 means don't record */
static int trigger_list_size = 1024; /* Number of list nodes */
/* Info to store when the diff is greater than the trigger */
struct thread_trigger {
int cpu;
int tnum; /* thread number */
int64_t ts; /* time-stamp */
int diff;
struct thread_trigger *next;
};
struct thread_trigger *head = NULL;
struct thread_trigger *tail = NULL;
struct thread_trigger *current = NULL;
static int spikes; /* count of the number of spikes */
static int trigger_init();
static void trigger_print();
static void trigger_update(struct thread_param *par, int diff, int64_t ts);
static int shutdown;
static int tracelimit = 0;
static int verbose = 0;
static int oscope_reduction = 1;
static int lockall = 0;
static int histogram = 0;
static int histofall = 0;
static int duration = 0;
static int use_nsecs = 0;
static int refresh_on_max;
static int force_sched_other;
static int priospread = 0;
static int check_clock_resolution;
static int ct_debug;
static int use_fifo = 0;
static pthread_t fifo_threadid;
static int laptop = 0;
static int use_histfile = 0;
#ifdef ARCH_HAS_SMI_COUNTER
static int smi = 0;
#else
#define smi 0
#endif
static pthread_cond_t refresh_on_max_cond = PTHREAD_COND_INITIALIZER;
static pthread_mutex_t refresh_on_max_lock = PTHREAD_MUTEX_INITIALIZER;
static pthread_mutex_t break_thread_id_lock = PTHREAD_MUTEX_INITIALIZER;
static pid_t break_thread_id = 0;
static uint64_t break_thread_value = 0;
static int aligned = 0;
static int secaligned = 0;
static int offset = 0;
static pthread_barrier_t align_barr;
static pthread_barrier_t globalt_barr;
static struct timespec globalt;
static char *procfileprefix = "/proc/sys/kernel/";
static char *fileprefix;
static char fifopath[MAX_PATH];
static char histfile[MAX_PATH];
static struct thread_param **parameters;
static struct thread_stat **statistics;
static void print_stat(FILE *fp, struct thread_param *par, int index, int verbose, int quiet);
static int latency_target_fd = -1;
static int32_t latency_target_value = 0;
/* Latency trick
* if the file /dev/cpu_dma_latency exists,
* open it and write a zero into it. This will tell
* the power management system not to transition to
* a high cstate (in fact, the system acts like idle=poll)
* When the fd to /dev/cpu_dma_latency is closed, the behavior
* goes back to the system default.
*
* Documentation/power/pm_qos_interface.txt
*/
static void set_latency_target(void)
{
struct stat s;
int err;
if (laptop) {
warn("not setting cpu_dma_latency to save battery power\n");
return;
}
errno = 0;
err = stat("/dev/cpu_dma_latency", &s);
if (err == -1) {
err_msg_n(errno, "WARN: stat /dev/cpu_dma_latency failed");
return;
}
errno = 0;
latency_target_fd = open("/dev/cpu_dma_latency", O_RDWR);
if (latency_target_fd == -1) {
err_msg_n(errno, "WARN: open /dev/cpu_dma_latency");
return;
}
errno = 0;
err = write(latency_target_fd, &latency_target_value, 4);
if (err < 1) {
err_msg_n(errno, "# error setting cpu_dma_latency to %d!", latency_target_value);
close(latency_target_fd);
return;
}
printf("# /dev/cpu_dma_latency set to %dus\n", latency_target_value);
}
enum {
ERROR_GENERAL = -1,
ERROR_NOTFOUND = -2,
};
static int trace_fd = -1;
static int tracemark_fd = -1;
static inline void tsnorm(struct timespec *ts)
{
while (ts->tv_nsec >= NSEC_PER_SEC) {
ts->tv_nsec -= NSEC_PER_SEC;
ts->tv_sec++;
}
}
static inline int tsgreater(struct timespec *a, struct timespec *b)
{
return ((a->tv_sec > b->tv_sec) ||
(a->tv_sec == b->tv_sec && a->tv_nsec > b->tv_nsec));
}
static inline int64_t calcdiff(struct timespec t1, struct timespec t2)
{
int64_t diff = USEC_PER_SEC * (long long)((int) t1.tv_sec - (int) t2.tv_sec);
diff += ((int) t1.tv_nsec - (int) t2.tv_nsec) / 1000;
return diff;
}
static inline int64_t calcdiff_ns(struct timespec t1, struct timespec t2)
{
int64_t diff;
diff = NSEC_PER_SEC * (int64_t)((int) t1.tv_sec - (int) t2.tv_sec);
diff += ((int) t1.tv_nsec - (int) t2.tv_nsec);
return diff;
}
static inline int64_t calctime(struct timespec t)
{
int64_t time;
time = USEC_PER_SEC * t.tv_sec;
time += ((int) t.tv_nsec) / 1000;
return time;
}
static int trace_file_exists(char *name)
{
struct stat sbuf;
char *tracing_prefix = get_debugfileprefix();
char path[MAX_PATH];
strcat(strcpy(path, tracing_prefix), name);
return stat(path, &sbuf) ? 0 : 1;
}
#define TRACEBUFSIZ 1024
static __thread char tracebuf[TRACEBUFSIZ];
static void tracemark(char *fmt, ...) __attribute__((format(printf, 1, 2)));
static void tracemark(char *fmt, ...)
{
va_list ap;
int len;
/* bail out if we're not tracing */
/* or if the kernel doesn't support trace_mark */
if (tracemark_fd < 0 || trace_fd < 0)
return;
va_start(ap, fmt);
len = vsnprintf(tracebuf, TRACEBUFSIZ, fmt, ap);
va_end(ap);
/* write the tracemark message */
write(tracemark_fd, tracebuf, len);
/* now stop any trace */
write(trace_fd, "0\n", 2);
}
static void open_tracemark_fd(void)
{
char path[MAX_PATH];
/*
* open the tracemark file if it's not already open
*/
if (tracemark_fd < 0) {
sprintf(path, "%s/%s", fileprefix, "trace_marker");
tracemark_fd = open(path, O_WRONLY);
if (tracemark_fd < 0) {
warn("unable to open trace_marker file: %s\n", path);
return;
}
}
/*
* if we're not tracing and the tracing_on fd is not open,
* open the tracing_on file so that we can stop the trace
* if we hit a breaktrace threshold
*/
if (trace_fd < 0) {
sprintf(path, "%s/%s", fileprefix, "tracing_on");
if ((trace_fd = open(path, O_WRONLY)) < 0)
warn("unable to open tracing_on file: %s\n", path);
}
}
static void debugfs_prepare(void)
{
if (mount_debugfs(NULL))
fatal("could not mount debugfs");
fileprefix = get_debugfileprefix();
if (!trace_file_exists("tracing_enabled") &&
!trace_file_exists("tracing_on"))
warn("tracing_enabled or tracing_on not found\n"
"debug fs not mounted");
}
static void enable_trace_mark(void)
{
debugfs_prepare();
open_tracemark_fd();
}
/*
* Raise the soft priority limit up to prio, if that is less than or equal
* to the hard limit
* if a call fails, return the error
* if successful return 0
* if fails, return -1
*/
static int raise_soft_prio(int policy, const struct sched_param *param)
{
int err;
int policy_max; /* max for scheduling policy such as SCHED_FIFO */
int soft_max;
int hard_max;
int prio;
struct rlimit rlim;
prio = param->sched_priority;
policy_max = sched_get_priority_max(policy);
if (policy_max == -1) {
err = errno;
err_msg("WARN: no such policy\n");
return err;
}
err = getrlimit(RLIMIT_RTPRIO, &rlim);
if (err) {
err = errno;
err_msg_n(err, "WARN: getrlimit failed");
return err;
}
soft_max = (rlim.rlim_cur == RLIM_INFINITY) ? policy_max : rlim.rlim_cur;
hard_max = (rlim.rlim_max == RLIM_INFINITY) ? policy_max : rlim.rlim_max;
if (prio > soft_max && prio <= hard_max) {
rlim.rlim_cur = prio;
err = setrlimit(RLIMIT_RTPRIO, &rlim);
if (err) {
err = errno;
err_msg_n(err, "WARN: setrlimit failed");
/* return err; */
}
} else {
err = -1;
}
return err;
}
/*
* Check the error status of sched_setscheduler
* If an error can be corrected by raising the soft limit priority to
* a priority less than or equal to the hard limit, then do so.
*/
static int setscheduler(pid_t pid, int policy, const struct sched_param *param)
{
int err = 0;
try_again:
err = sched_setscheduler(pid, policy, param);
if (err) {
err = errno;
if (err == EPERM) {
int err1;
err1 = raise_soft_prio(policy, param);
if (!err1) goto try_again;
}
}
return err;
}
#ifdef ARCH_HAS_SMI_COUNTER
static int open_msr_file(int cpu)
{
int fd;
char pathname[32];
/* SMI needs thread affinity */
sprintf(pathname, "/dev/cpu/%d/msr", cpu);
fd = open(pathname, O_RDONLY);
if (fd < 0)
warn("%s open failed, try chown or chmod +r "
"/dev/cpu/*/msr, or run as root\n", pathname);
return fd;
}
static int get_msr(int fd, off_t offset, unsigned long long *msr)
{
ssize_t retval;
retval = pread(fd, msr, sizeof *msr, offset);
if (retval != sizeof *msr)
return 1;
return 0;
}
static int get_smi_counter(int fd, unsigned long *counter)
{
int retval;
unsigned long long msr;
retval = get_msr(fd, MSR_SMI_COUNT, &msr);
if (retval)
return retval;
*counter = (unsigned long) (msr & MSR_SMI_COUNT_MASK);
return 0;
}
#include <cpuid.h>
/* Based on turbostat's check */
static int has_smi_counter(void)
{
unsigned int ebx, ecx, edx, max_level;
unsigned int fms, family, model;
fms = family = model = ebx = ecx = edx = 0;
__get_cpuid(0, &max_level, &ebx, &ecx, &edx);
/* check genuine intel */
if (!(ebx == 0x756e6547 && edx == 0x49656e69 && ecx == 0x6c65746e))
return 0;
__get_cpuid(1, &fms, &ebx, &ecx, &edx);
family = (fms >> 8) & 0xf;
if (family != 6)
return 0;
/* no MSR */
if (!(edx & (1 << 5)))
return 0;
model = (((fms >> 16) & 0xf) << 4) + ((fms >> 4) & 0xf);
switch (model) {
case 0x1A: /* Core i7, Xeon 5500 series - Bloomfield, Gainstown NHM-EP */
case 0x1E: /* Core i7 and i5 Processor - Clarksfield, Lynnfield, Jasper Forest */
case 0x1F: /* Core i7 and i5 Processor - Nehalem */
case 0x25: /* Westmere Client - Clarkdale, Arrandale */
case 0x2C: /* Westmere EP - Gulftown */
case 0x2E: /* Nehalem-EX Xeon - Beckton */
case 0x2F: /* Westmere-EX Xeon - Eagleton */
case 0x2A: /* SNB */
case 0x2D: /* SNB Xeon */
case 0x3A: /* IVB */
case 0x3E: /* IVB Xeon */
case 0x3C: /* HSW */
case 0x3F: /* HSX */
case 0x45: /* HSW */
case 0x46: /* HSW */
case 0x3D: /* BDW */
case 0x47: /* BDW */
case 0x4F: /* BDX */
case 0x56: /* BDX-DE */
case 0x4E: /* SKL */
case 0x5E: /* SKL */
case 0x8E: /* KBL */
case 0x9E: /* KBL */
case 0x55: /* SKX */
case 0x37: /* BYT */
case 0x4D: /* AVN */
case 0x4C: /* AMT */
case 0x57: /* PHI */
case 0x5C: /* BXT */
case 0x5F: /* DNV */
case 0x7A: /* Gemini Lake */
case 0x85: /* Knights Mill */
break;
default:
return 0;
}
return 1;
}
#else
static int open_msr_file(int cpu)
{
return -1;
}
static int get_smi_counter(int fd, unsigned long *counter)
{
return 1;
}
static int has_smi_counter(void)
{
return 0;
}
#endif
/*
* timer thread
*
* Modes:
* - clock_nanosleep based
* - cyclic timer based
*
* Clock:
* - CLOCK_MONOTONIC
* - CLOCK_REALTIME
*
*/
static void *timerthread(void *param)
{
struct thread_param *par = param;
struct sched_param schedp;
struct sigevent sigev;
sigset_t sigset;
timer_t timer;
struct timespec now, next, interval, stop;
struct itimerval itimer;
struct itimerspec tspec;
struct thread_stat *stat = par->stats;
int stopped = 0;
cpu_set_t mask;
pthread_t thread;
unsigned long smi_now, smi_old = 0;
memset(&stop, 0, sizeof(stop));
/* if we're running in numa mode, set our memory node */
if (par->node != -1)
rt_numa_set_numa_run_on_node(par->node, par->cpu);
if (par->cpu != -1) {
CPU_ZERO(&mask);
CPU_SET(par->cpu, &mask);
thread = pthread_self();
if (pthread_setaffinity_np(thread, sizeof(mask), &mask) == -1)
warn("Could not set CPU affinity to CPU #%d\n",
par->cpu);
}
interval.tv_sec = par->interval / USEC_PER_SEC;
interval.tv_nsec = (par->interval % USEC_PER_SEC) * 1000;
stat->tid = gettid();
sigemptyset(&sigset);
sigaddset(&sigset, par->signal);
sigprocmask(SIG_BLOCK, &sigset, NULL);
if (par->mode == MODE_CYCLIC) {
sigev.sigev_notify = SIGEV_THREAD_ID | SIGEV_SIGNAL;
sigev.sigev_signo = par->signal;
sigev.sigev_notify_thread_id = stat->tid;
timer_create(par->clock, &sigev, &timer);
tspec.it_interval = interval;
}
memset(&schedp, 0, sizeof(schedp));
schedp.sched_priority = par->prio;
if (setscheduler(0, par->policy, &schedp))
fatal("timerthread%d: failed to set priority to %d\n",
par->cpu, par->prio);
if(smi) {
par->msr_fd = open_msr_file(par->cpu);
if (par->msr_fd < 0)
fatal("Could not open MSR interface, errno: %d\n",
errno);
/* get current smi count to use as base value */
if (get_smi_counter(par->msr_fd, &smi_old))
fatal("Could not read SMI counter, errno: %d\n",
par->cpu, errno);
}
/* Get current time */
if (aligned || secaligned) {
pthread_barrier_wait(&globalt_barr);
if (par->tnum == 0) {
clock_gettime(par->clock, &globalt);
if (secaligned) {
/* Ensure that the thread start timestamp is not
in the past */
if (globalt.tv_nsec > 900000000)
globalt.tv_sec += 2;
else
globalt.tv_sec++;
globalt.tv_nsec = 0;
}
}
pthread_barrier_wait(&align_barr);
now = globalt;
if (offset) {
if (aligned)
now.tv_nsec += offset * par->tnum;
else
now.tv_nsec += offset;
tsnorm(&now);
}
} else
clock_gettime(par->clock, &now);
next = now;
next.tv_sec += interval.tv_sec;
next.tv_nsec += interval.tv_nsec;
tsnorm(&next);
if (duration) {
memset(&stop, 0, sizeof(stop)); /* grrr */
stop = now;
stop.tv_sec += duration;
}
if (par->mode == MODE_CYCLIC) {
if (par->timermode == TIMER_ABSTIME)
tspec.it_value = next;
else
tspec.it_value = interval;
timer_settime(timer, par->timermode, &tspec, NULL);
}
if (par->mode == MODE_SYS_ITIMER) {
itimer.it_interval.tv_sec = interval.tv_sec;
itimer.it_interval.tv_usec = interval.tv_nsec / 1000;
itimer.it_value = itimer.it_interval;
setitimer(ITIMER_REAL, &itimer, NULL);
}
stat->threadstarted++;
while (!shutdown) {
uint64_t diff;
unsigned long diff_smi = 0;
int sigs, ret;
/* Wait for next period */
switch (par->mode) {
case MODE_CYCLIC:
case MODE_SYS_ITIMER:
if (sigwait(&sigset, &sigs) < 0)
goto out;
break;
case MODE_CLOCK_NANOSLEEP:
if (par->timermode == TIMER_ABSTIME) {
ret = clock_nanosleep(par->clock, TIMER_ABSTIME,
&next, NULL);
if (ret != 0) {
if (ret != EINTR)
warn("clock_nanosleep failed. errno: %d\n", errno);
goto out;
}
} else {
ret = clock_gettime(par->clock, &now);
if (ret != 0) {
if (ret != EINTR)
warn("clock_gettime() failed: %s", strerror(errno));
goto out;
}
ret = clock_nanosleep(par->clock,
TIMER_RELTIME, &interval, NULL);
if (ret != 0) {
if (ret != EINTR)
warn("clock_nanosleep() failed. errno: %d\n", errno);
goto out;
}
next.tv_sec = now.tv_sec + interval.tv_sec;
next.tv_nsec = now.tv_nsec + interval.tv_nsec;
tsnorm(&next);
}
break;
case MODE_SYS_NANOSLEEP:
ret = clock_gettime(par->clock, &now);
if (ret != 0) {
if (ret != EINTR)
warn("clock_gettime() failed: errno %d\n", errno);
goto out;
}
if (nanosleep(&interval, NULL)) {
if (errno != EINTR)
warn("nanosleep failed. errno: %d\n",
errno);
goto out;
}
next.tv_sec = now.tv_sec + interval.tv_sec;
next.tv_nsec = now.tv_nsec + interval.tv_nsec;
tsnorm(&next);
break;
}
ret = clock_gettime(par->clock, &now);
if (ret != 0) {
if (ret != EINTR)
warn("clock_gettime() failed. errno: %d\n",
errno);
goto out;
}
if (smi) {
if (get_smi_counter(par->msr_fd, &smi_now)) {
warn("Could not read SMI counter, errno: %d\n",
par->cpu, errno);
goto out;
}
diff_smi = smi_now - smi_old;
stat->smi_count += diff_smi;
smi_old = smi_now;
}
if (use_nsecs)
diff = calcdiff_ns(now, next);
else
diff = calcdiff(now, next);
if (diff < stat->min)
stat->min = diff;
if (diff > stat->max) {
stat->max = diff;
if (refresh_on_max)
pthread_cond_signal(&refresh_on_max_cond);
}
stat->avg += (double) diff;
if (trigger && (diff > trigger)) {
trigger_update(par, diff, calctime(now));
}
if (duration && (calcdiff(now, stop) >= 0))
shutdown++;
if (!stopped && tracelimit && (diff > tracelimit)) {
stopped++;
tracemark("hit latency threshold (%llu > %d)",
(unsigned long long) diff, tracelimit);
shutdown++;
pthread_mutex_lock(&break_thread_id_lock);
if (break_thread_id == 0)
break_thread_id = stat->tid;
break_thread_value = diff;
pthread_mutex_unlock(&break_thread_id_lock);
}
stat->act = diff;
if (par->bufmsk) {
stat->values[stat->cycles & par->bufmsk] = diff;
if (smi)
stat->smis[stat->cycles & par->bufmsk] = diff_smi;
}
/* Update the histogram */
if (histogram) {
if (diff >= histogram) {
stat->hist_overflow++;
if (stat->num_outliers < histogram)
stat->outliers[stat->num_outliers++] = stat->cycles;
} else {
stat->hist_array[diff]++;
}
}
stat->cycles++;
next.tv_sec += interval.tv_sec;
next.tv_nsec += interval.tv_nsec;
if (par->mode == MODE_CYCLIC) {
int overrun_count = timer_getoverrun(timer);
next.tv_sec += overrun_count * interval.tv_sec;
next.tv_nsec += overrun_count * interval.tv_nsec;
}
tsnorm(&next);
while (tsgreater(&now, &next)) {
next.tv_sec += interval.tv_sec;
next.tv_nsec += interval.tv_nsec;
tsnorm(&next);
}
if (par->max_cycles && par->max_cycles == stat->cycles)
break;
}
out:
if (refresh_on_max) {
pthread_mutex_lock(&refresh_on_max_lock);
/* We could reach here with both shutdown and allstopped unset (0).
* Set shutdown with synchronization to notify the main
* thread not to be blocked when it should exit.
*/
shutdown++;
pthread_cond_signal(&refresh_on_max_cond);
pthread_mutex_unlock(&refresh_on_max_lock);
}
if (par->mode == MODE_CYCLIC)
timer_delete(timer);
if (par->mode == MODE_SYS_ITIMER) {
itimer.it_value.tv_sec = 0;
itimer.it_value.tv_usec = 0;
itimer.it_interval.tv_sec = 0;
itimer.it_interval.tv_usec = 0;
setitimer(ITIMER_REAL, &itimer, NULL);
}
/* close msr file */
if (smi)
close(par->msr_fd);
/* switch to normal */
schedp.sched_priority = 0;
sched_setscheduler(0, SCHED_OTHER, &schedp);
stat->threadstarted = -1;
return NULL;
}
/* Print usage information */
static void display_help(int error)
{
printf("cyclictest V %1.2f\n", VERSION);
printf("Usage:\n"
"cyclictest <options>\n\n"
#if LIBNUMA_API_VERSION >= 2
"-a [CPUSET] --affinity Run thread #N on processor #N, if possible, or if CPUSET\n"
" given, pin threads to that set of processors in round-\n"
" robin order. E.g. -a 2 pins all threads to CPU 2,\n"
" but -a 3-5,0 -t 5 will run the first and fifth\n"
" threads on CPU (0),thread #2 on CPU 3, thread #3\n"
" on CPU 4, and thread #5 on CPU 5.\n"
#else
"-a [NUM] --affinity run thread #N on processor #N, if possible\n"
" with NUM pin all threads to the processor NUM\n"
#endif
"-A USEC --aligned=USEC align thread wakeups to a specific offset\n"
"-b USEC --breaktrace=USEC send break trace command when latency > USEC\n"
"-c CLOCK --clock=CLOCK select clock\n"
" 0 = CLOCK_MONOTONIC (default)\n"
" 1 = CLOCK_REALTIME\n"
"-d DIST --distance=DIST distance of thread intervals in us, default=500\n"
"-D --duration=TIME specify a length for the test run.\n"
" Append 'm', 'h', or 'd' to specify minutes, hours or days.\n"
" --latency=PM_QOS write PM_QOS to /dev/cpu_dma_latency\n"
"-F --fifo=<path> create a named pipe at path and write stats to it\n"
"-h --histogram=US dump a latency histogram to stdout after the run\n"
" US is the max latency time to be be tracked in microseconds\n"
" This option runs all threads at the same priority.\n"
"-H --histofall=US same as -h except with an additional summary column\n"
" --histfile=<path> dump the latency histogram to <path> instead of stdout\n"
"-i INTV --interval=INTV base interval of thread in us default=1000\n"
"-l LOOPS --loops=LOOPS number of loops: default=0(endless)\n"
" --laptop Save battery when running cyclictest\n"
" This will give you poorer realtime results\n"
" but will not drain your battery so quickly\n"
"-m --mlockall lock current and future memory allocations\n"
"-M --refresh_on_max delay updating the screen until a new max\n"
" latency is hit. Useful for low bandwidth.\n"
"-N --nsecs print results in ns instead of us (default us)\n"
"-o RED --oscope=RED oscilloscope mode, reduce verbose output by RED\n"
"-p PRIO --priority=PRIO priority of highest prio thread\n"
" --policy=NAME policy of measurement thread, where NAME may be one\n"
" of: other, normal, batch, idle, fifo or rr.\n"
" --priospread spread priority levels starting at specified value\n"
"-q --quiet print a summary only on exit\n"
"-r --relative use relative timer instead of absolute\n"
"-R --resolution check clock resolution, calling clock_gettime() many\n"
" times. List of clock_gettime() values will be\n"
" reported with -X\n"
" --secaligned [USEC] align thread wakeups to the next full second\n"
" and apply the optional offset\n"
"-s --system use sys_nanosleep and sys_setitimer\n"
"-S --smp Standard SMP testing: options -a -t and same priority\n"
" of all threads\n"
" --spike=<trigger> record all spikes > trigger\n"
" --spike-nodes=[num of nodes]\n"
" These are the maximum number of spikes we can record.\n"
" The default is 1024 if not specified\n"
#ifdef ARCH_HAS_SMI_COUNTER
" --smi Enable SMI counting\n"
#endif
"-t --threads one thread per available processor\n"
"-t [NUM] --threads=NUM number of threads:\n"
" without NUM, threads = max_cpus\n"
" without -t default = 1\n"
" --tracemark write a trace mark when -b latency is exceeded\n"
"-u --unbuffered force unbuffered output for live processing\n"
"-v --verbose output values on stdout for statistics\n"
" format: n:c:v n=tasknum c=count v=value in us\n"
" --dbg_cyclictest print info useful for debugging cyclictest\n"
"-x --posix_timers use POSIX timers instead of clock_nanosleep.\n"
);
if (error)
exit(EXIT_FAILURE);
exit(EXIT_SUCCESS);
}
static int use_nanosleep = MODE_CLOCK_NANOSLEEP;
static int timermode = TIMER_ABSTIME;
static int use_system;
static int priority;
static int policy = SCHED_OTHER; /* default policy if not specified */
static int num_threads = 1;
static int max_cycles;
static int clocksel = 0;
static int quiet;
static int interval = DEFAULT_INTERVAL;
static int distance = -1;
static struct bitmask *affinity_mask = NULL;
static int smp = 0;
enum {
AFFINITY_UNSPECIFIED,
AFFINITY_SPECIFIED,
AFFINITY_USEALL
};
static int setaffinity = AFFINITY_UNSPECIFIED;
static int clocksources[] = {
CLOCK_MONOTONIC,
CLOCK_REALTIME,
};
static unsigned int is_cpumask_zero(const struct bitmask *mask)
{
return (rt_numa_bitmask_count(mask) == 0);
}
static int cpu_for_thread(int thread_num, int max_cpus)
{
unsigned int m, cpu, i, num_cpus;
num_cpus = rt_numa_bitmask_count(affinity_mask);
m = thread_num % num_cpus;
/* there are num_cpus bits set, we want position of m'th one */
for (i = 0, cpu = 0; i < max_cpus; i++) {
if (rt_numa_bitmask_isbitset(affinity_mask, i)) {
if (cpu == m)
return i;
cpu++;
}
}
fprintf(stderr, "Bug in cpu mask handling code.\n");
return 0;
}
static void parse_cpumask(const char *option, const int max_cpus)
{
affinity_mask = rt_numa_parse_cpustring(option, max_cpus);
if (affinity_mask) {
if (is_cpumask_zero(affinity_mask)) {
rt_bitmask_free(affinity_mask);
affinity_mask = NULL;
}
}
if (!affinity_mask)
display_help(1);
if (verbose) {
printf("%s: Using %u cpus.\n", __func__,
rt_numa_bitmask_count(affinity_mask));
}
}
static void handlepolicy(char *polname)
{
if (strncasecmp(polname, "other", 5) == 0)
policy = SCHED_OTHER;
else if (strncasecmp(polname, "batch", 5) == 0)
policy = SCHED_BATCH;
else if (strncasecmp(polname, "idle", 4) == 0)
policy = SCHED_IDLE;
else if (strncasecmp(polname, "fifo", 4) == 0)
policy = SCHED_FIFO;
else if (strncasecmp(polname, "rr", 2) == 0)
policy = SCHED_RR;
else /* default policy if we don't recognize the request */
policy = SCHED_OTHER;
}
static char *policyname(int policy)
{
char *policystr = "";
switch(policy) {
case SCHED_OTHER:
policystr = "other";
break;
case SCHED_FIFO:
policystr = "fifo";
break;
case SCHED_RR:
policystr = "rr";
break;
case SCHED_BATCH:
policystr = "batch";
break;
case SCHED_IDLE:
policystr = "idle";
break;
}
return policystr;
}
enum option_values {
OPT_AFFINITY=1, OPT_BREAKTRACE, OPT_CLOCK,
OPT_DISTANCE, OPT_DURATION, OPT_LATENCY,
OPT_FIFO, OPT_HISTOGRAM, OPT_HISTOFALL, OPT_HISTFILE,
OPT_INTERVAL, OPT_LOOPS, OPT_MLOCKALL, OPT_REFRESH,
OPT_NANOSLEEP, OPT_NSECS, OPT_OSCOPE, OPT_PRIORITY,
OPT_QUIET, OPT_PRIOSPREAD, OPT_RELATIVE, OPT_RESOLUTION,
OPT_SYSTEM, OPT_SMP, OPT_THREADS, OPT_TRIGGER,
OPT_TRIGGER_NODES, OPT_UNBUFFERED, OPT_NUMA, OPT_VERBOSE,
OPT_DBGCYCLIC, OPT_POLICY, OPT_HELP, OPT_NUMOPTS,
OPT_ALIGNED, OPT_SECALIGNED, OPT_LAPTOP, OPT_SMI,
OPT_TRACEMARK, OPT_POSIX_TIMERS,
};
/* Process commandline options */
static void process_options (int argc, char *argv[], int max_cpus)
{
int error = 0;
int option_affinity = 0;
for (;;) {
int option_index = 0;
/*
* Options for getopt
* Ordered alphabetically by single letter name
*/
static struct option long_options[] = {
{"affinity", optional_argument, NULL, OPT_AFFINITY},
{"aligned", optional_argument, NULL, OPT_ALIGNED },
{"breaktrace", required_argument, NULL, OPT_BREAKTRACE },
{"clock", required_argument, NULL, OPT_CLOCK },
{"distance", required_argument, NULL, OPT_DISTANCE },
{"duration", required_argument, NULL, OPT_DURATION },
{"latency", required_argument, NULL, OPT_LATENCY },
{"fifo", required_argument, NULL, OPT_FIFO },
{"histogram", required_argument, NULL, OPT_HISTOGRAM },
{"histofall", required_argument, NULL, OPT_HISTOFALL },
{"histfile", required_argument, NULL, OPT_HISTFILE },
{"interval", required_argument, NULL, OPT_INTERVAL },
{"laptop", no_argument, NULL, OPT_LAPTOP },
{"loops", required_argument, NULL, OPT_LOOPS },
{"mlockall", no_argument, NULL, OPT_MLOCKALL },
{"refresh_on_max", no_argument, NULL, OPT_REFRESH },
{"nsecs", no_argument, NULL, OPT_NSECS },
{"oscope", required_argument, NULL, OPT_OSCOPE },
{"priority", required_argument, NULL, OPT_PRIORITY },
{"quiet", no_argument, NULL, OPT_QUIET },
{"priospread", no_argument, NULL, OPT_PRIOSPREAD },
{"relative", no_argument, NULL, OPT_RELATIVE },
{"resolution", no_argument, NULL, OPT_RESOLUTION },
{"secaligned", optional_argument, NULL, OPT_SECALIGNED },
{"system", no_argument, NULL, OPT_SYSTEM },
{"smi", no_argument, NULL, OPT_SMI },
{"smp", no_argument, NULL, OPT_SMP },
{"spike", required_argument, NULL, OPT_TRIGGER },
{"spike-nodes", required_argument, NULL, OPT_TRIGGER_NODES },
{"threads", optional_argument, NULL, OPT_THREADS },
{"unbuffered", no_argument, NULL, OPT_UNBUFFERED },
{"verbose", no_argument, NULL, OPT_VERBOSE },
{"dbg_cyclictest", no_argument, NULL, OPT_DBGCYCLIC },
{"policy", required_argument, NULL, OPT_POLICY },
{"help", no_argument, NULL, OPT_HELP },
{"posix_timers", no_argument, NULL, OPT_POSIX_TIMERS },
{NULL, 0, NULL, 0 },
};
int c = getopt_long(argc, argv, "a::A::b:c:d:D:h:H:i:l:MNo:p:mqrRsSt::uvD:x",
long_options, &option_index);
if (c == -1)
break;
switch (c) {
case 'a':
case OPT_AFFINITY:
option_affinity = 1;
/* smp sets AFFINITY_USEALL in OPT_SMP */
if (smp)
break;
if (optarg != NULL) {
parse_cpumask(optarg, max_cpus);
setaffinity = AFFINITY_SPECIFIED;
} else if (optind<argc && atoi(argv[optind])) {
parse_cpumask(argv[optind], max_cpus);
setaffinity = AFFINITY_SPECIFIED;
} else {
setaffinity = AFFINITY_USEALL;
}
break;
case 'A':
case OPT_ALIGNED:
aligned=1;
if (optarg != NULL)
offset = atoi(optarg) * 1000;
else if (optind<argc && atoi(argv[optind]))
offset = atoi(argv[optind]) * 1000;
else
offset = 0;
break;
case 'b':
case OPT_BREAKTRACE:
tracelimit = atoi(optarg); break;
case 'c':
case OPT_CLOCK:
clocksel = atoi(optarg); break;
case 'C':
case 'd':
case OPT_DISTANCE:
distance = atoi(optarg); break;
case 'D':
case OPT_DURATION:
duration = parse_time_string(optarg); break;
case 'E':
case 'F':
case OPT_FIFO:
use_fifo = 1;
strncpy(fifopath, optarg, strnlen(optarg, MAX_PATH-1));
break;
case 'H':
case OPT_HISTOFALL:
histofall = 1; /* fall through */
case 'h':
case OPT_HISTOGRAM:
histogram = atoi(optarg); break;
case OPT_HISTFILE:
use_histfile = 1;
strncpy(histfile, optarg, strnlen(optarg, MAX_PATH-1));
break;
case 'i':
case OPT_INTERVAL:
interval = atoi(optarg); break;
case 'l':
case OPT_LOOPS:
max_cycles = atoi(optarg); break;
case 'm':
case OPT_MLOCKALL:
lockall = 1; break;
case 'M':
case OPT_REFRESH:
refresh_on_max = 1; break;
case 'N':
case OPT_NSECS:
use_nsecs = 1; break;
case 'o':
case OPT_OSCOPE:
oscope_reduction = atoi(optarg); break;
case 'p':
case OPT_PRIORITY:
priority = atoi(optarg);
if (policy != SCHED_FIFO && policy != SCHED_RR)
policy = SCHED_FIFO;
break;
case 'q':
case OPT_QUIET:
quiet = 1; break;
case 'r':
case OPT_RELATIVE:
timermode = TIMER_RELTIME; break;
case 'R':
case OPT_RESOLUTION:
check_clock_resolution = 1; break;
case OPT_SECALIGNED:
secaligned = 1;
if (optarg != NULL)
offset = atoi(optarg) * 1000;
else if (optind < argc && atoi(argv[optind]))
offset = atoi(argv[optind]) * 1000;
else
offset = 0;
break;
case 's':
case OPT_SYSTEM:
use_system = MODE_SYS_OFFSET; break;
case 'S':
case OPT_SMP: /* SMP testing */
if (numa)
fatal("numa and smp options are mutually exclusive\n");
smp = 1;
num_threads = max_cpus;
setaffinity = AFFINITY_USEALL;
break;
case 't':
case OPT_THREADS:
if (smp) {
warn("-t ignored due to smp mode\n");
break;
}
if (optarg != NULL)
num_threads = atoi(optarg);
else if (optind<argc && atoi(argv[optind]))
num_threads = atoi(argv[optind]);
else
num_threads = max_cpus;
break;
case OPT_TRIGGER:
trigger = atoi(optarg);
break;
case OPT_TRIGGER_NODES:
if (trigger)
trigger_list_size = atoi(optarg);
break;
case 'u':
case OPT_UNBUFFERED:
setvbuf(stdout, NULL, _IONBF, 0); break;
case 'v':
case OPT_VERBOSE: verbose = 1; break;
case 'x':
case OPT_POSIX_TIMERS:
use_nanosleep = MODE_CYCLIC; break;
case '?':
case OPT_HELP:
display_help(0); break;
/* long only options */
case OPT_PRIOSPREAD:
priospread = 1; break;
case OPT_LATENCY:
/* power management latency target value */
/* note: default is 0 (zero) */
latency_target_value = atoi(optarg);
if (latency_target_value < 0)
latency_target_value = 0;
break;
case OPT_POLICY:
handlepolicy(optarg); break;
case OPT_DBGCYCLIC:
ct_debug = 1; break;
case OPT_LAPTOP:
laptop = 1; break;
case OPT_SMI:
#ifdef ARCH_HAS_SMI_COUNTER
smi = 1;
#else
fatal("--smi is not available on your arch\n");
#endif
break;
}
}
/* if smp wasn't requested, test for numa automatically */
if (!smp) {
#ifdef NUMA
if (numa_available() != -1)
numa = 1;
#else
warn("cyclictest was not built with the numa option\n");
numa = 0;
#endif
}
if (option_affinity) {
if (smp)
warn("-a ignored due to smp mode\n");
}
if (smi) {
if (setaffinity == AFFINITY_UNSPECIFIED)
fatal("SMI counter relies on thread affinity\n");
if (!has_smi_counter())
fatal("SMI counter is not supported "
"on this processor\n");
}
if (tracelimit)
fileprefix = procfileprefix;
if (clocksel < 0 || clocksel > ARRAY_SIZE(clocksources))
error = 1;
if (oscope_reduction < 1)
error = 1;
if (oscope_reduction > 1 && !verbose) {
warn("-o option only meaningful, if verbose\n");
error = 1;
}
if (histogram < 0)
error = 1;
if (histogram > HIST_MAX)
histogram = HIST_MAX;
if (histogram && distance != -1)
warn("distance is ignored and set to 0, if histogram enabled\n");
if (distance == -1)
distance = DEFAULT_DISTANCE;
if (priority < 0 || priority > 99)
error = 1;
if (priospread && priority == 0) {
fprintf(stderr, "defaulting realtime priority to %d\n",
num_threads+1);
priority = num_threads+1;
}
if (priority && (policy != SCHED_FIFO && policy != SCHED_RR)) {
fprintf(stderr, "policy and priority don't match: setting policy to SCHED_FIFO\n");
policy = SCHED_FIFO;
}
if ((policy == SCHED_FIFO || policy == SCHED_RR) && priority == 0) {
fprintf(stderr, "defaulting realtime priority to %d\n",
num_threads+1);
priority = num_threads+1;
}
if (num_threads < 1)
error = 1;
if (aligned && secaligned)
error = 1;
if (aligned || secaligned) {
pthread_barrier_init(&globalt_barr, NULL, num_threads);
pthread_barrier_init(&align_barr, NULL, num_threads);
}
if (error) {
if (affinity_mask)
rt_bitmask_free(affinity_mask);
display_help(1);
}
}
static int check_timer(void)
{
struct timespec ts;
if (clock_getres(CLOCK_MONOTONIC, &ts))
return 1;
return (ts.tv_sec != 0 || ts.tv_nsec != 1);
}
static void sighand(int sig)
{
if (sig == SIGUSR1) {
int i;
int oldquiet = quiet;
quiet = 0;
fprintf(stderr, "#---------------------------\n");
fprintf(stderr, "# cyclictest current status:\n");
for (i = 0; i < num_threads; i++)
print_stat(stderr, parameters[i], i, 0, 0);
fprintf(stderr, "#---------------------------\n");
quiet = oldquiet;
return;
}
shutdown = 1;
if (refresh_on_max)
pthread_cond_signal(&refresh_on_max_cond);
}
static void print_tids(struct thread_param *par[], int nthreads)
{
int i;
printf("# Thread Ids:");
for (i = 0; i < nthreads; i++)
printf(" %05d", par[i]->stats->tid);
printf("\n");
}
static void print_hist(struct thread_param *par[], int nthreads)
{
int i, j;
unsigned long long int log_entries[nthreads+1];
unsigned long maxmax, alloverflows;
FILE *fd;
bzero(log_entries, sizeof(log_entries));
if (use_histfile) {
fd = fopen(histfile, "w");
if (!fd) {
perror("opening histogram file:");
return;
}
} else {
fd = stdout;
}
fprintf(fd, "# Histogram\n");
for (i = 0; i < histogram; i++) {
unsigned long long int allthreads = 0;
fprintf(fd, "%06d ", i);
for (j = 0; j < nthreads; j++) {
unsigned long curr_latency=par[j]->stats->hist_array[i];
fprintf(fd, "%06lu", curr_latency);
if (j < nthreads - 1)
fprintf(fd, "\t");
log_entries[j] += curr_latency;
allthreads += curr_latency;
}
if (histofall && nthreads > 1) {
fprintf(fd, "\t%06llu", allthreads);
log_entries[nthreads] += allthreads;
}
fprintf(fd, "\n");
}
fprintf(fd, "# Total:");
for (j = 0; j < nthreads; j++)
fprintf(fd, " %09llu", log_entries[j]);
if (histofall && nthreads > 1)
fprintf(fd, " %09llu", log_entries[nthreads]);
fprintf(fd, "\n");
fprintf(fd, "# Min Latencies:");
for (j = 0; j < nthreads; j++)
fprintf(fd, " %05lu", par[j]->stats->min);
fprintf(fd, "\n");
fprintf(fd, "# Avg Latencies:");
for (j = 0; j < nthreads; j++)
fprintf(fd, " %05lu", par[j]->stats->cycles ?
(long)(par[j]->stats->avg/par[j]->stats->cycles) : 0);
fprintf(fd, "\n");
fprintf(fd, "# Max Latencies:");
maxmax = 0;
for (j = 0; j < nthreads; j++) {
fprintf(fd, " %05lu", par[j]->stats->max);
if (par[j]->stats->max > maxmax)
maxmax = par[j]->stats->max;
}
if (histofall && nthreads > 1)
fprintf(fd, " %05lu", maxmax);
fprintf(fd, "\n");
fprintf(fd, "# Histogram Overflows:");
alloverflows = 0;
for (j = 0; j < nthreads; j++) {
fprintf(fd, " %05lu", par[j]->stats->hist_overflow);
alloverflows += par[j]->stats->hist_overflow;
}
if (histofall && nthreads > 1)
fprintf(fd, " %05lu", alloverflows);
fprintf(fd, "\n");
fprintf(fd, "# Histogram Overflow at cycle number:\n");
for (i = 0; i < nthreads; i++) {
fprintf(fd, "# Thread %d:", i);
for (j = 0; j < par[i]->stats->num_outliers; j++)
fprintf(fd, " %05lu", par[i]->stats->outliers[j]);
if (par[i]->stats->num_outliers < par[i]->stats->hist_overflow)
fprintf(fd, " # %05lu others", par[i]->stats->hist_overflow - par[i]->stats->num_outliers);
fprintf(fd, "\n");
}
if (smi) {
fprintf(fd, "# SMIs:");
for (i = 0; i < nthreads; i++)
fprintf(fd, " %05lu", par[i]->stats->smi_count);
fprintf(fd, "\n");
}
fprintf(fd, "\n");
if (use_histfile)
fclose(fd);
}
static void print_stat(FILE *fp, struct thread_param *par, int index, int verbose, int quiet)
{
struct thread_stat *stat = par->stats;
if (!verbose) {
if (quiet != 1) {
char *fmt;
if (use_nsecs)
fmt = "T:%2d (%5d) P:%2d I:%ld C:%7lu "
"Min:%7ld Act:%8ld Avg:%8ld Max:%8ld";
else
fmt = "T:%2d (%5d) P:%2d I:%ld C:%7lu "
"Min:%7ld Act:%5ld Avg:%5ld Max:%8ld";
fprintf(fp, fmt, index, stat->tid, par->prio,
par->interval, stat->cycles, stat->min,
stat->act, stat->cycles ?
(long)(stat->avg/stat->cycles) : 0, stat->max);
if (smi)
fprintf(fp," SMI:%8ld", stat->smi_count);
fprintf(fp, "\n");
}
} else {
while (stat->cycles != stat->cyclesread) {
unsigned long diff_smi;
long diff = stat->values
[stat->cyclesread & par->bufmsk];
if (smi)
diff_smi = stat->smis
[stat->cyclesread & par->bufmsk];
if (diff > stat->redmax) {
stat->redmax = diff;
stat->cycleofmax = stat->cyclesread;
}
if (++stat->reduce == oscope_reduction) {
if (!smi)
fprintf(fp, "%8d:%8lu:%8ld\n", index,
stat->cycleofmax, stat->redmax);
else
fprintf(fp, "%8d:%8lu:%8ld%8ld\n",
index, stat->cycleofmax,
stat->redmax, diff_smi);
stat->reduce = 0;
stat->redmax = 0;
}
stat->cyclesread++;
}
}
}
/*
* thread that creates a named fifo and hands out run stats when someone
* reads from the fifo.
*/
static void *fifothread(void *param)
{
int ret;
int fd;
FILE *fp;
int i;
unlink(fifopath);
ret = mkfifo(fifopath, 0666);
if (ret) {
fprintf(stderr, "Error creating fifo %s: %s\n", fifopath, strerror(errno));
return NULL;
}
while (!shutdown) {
fd = open(fifopath, O_WRONLY|O_NONBLOCK);
if (fd < 0) {
usleep(500000);
continue;
}
fp = fdopen(fd, "w");
for (i=0; i < num_threads; i++)
print_stat(fp, parameters[i], i, 0, 0);
fclose(fp);
usleep(250);
}
unlink(fifopath);
return NULL;
}
static int trigger_init()
{
int i;
int size = trigger_list_size;
struct thread_trigger *trig = NULL;
for(i=0; i<size; i++) {
trig = malloc(sizeof(struct thread_trigger));
if (trig != NULL) {
if (head == NULL) {
head = trig;
tail = trig;
} else {
tail->next = trig;
tail = trig;
}
trig->tnum = i;
trig->next = NULL;
} else {
return -1;
}
}
current = head;
return 0;
}
static void trigger_print()
{
struct thread_trigger *trig = head;
char *fmt = "T:%2d Spike:%8ld: TS: %12ld\n";
if (current == head) return;
printf("\n");
while (trig->next != current) {
fprintf(stdout, fmt, trig->tnum, trig->diff, trig->ts);
trig = trig->next;
}
fprintf(stdout, fmt, trig->tnum, trig->diff, trig->ts);
printf("spikes = %d\n\n", spikes);
}
static void trigger_update(struct thread_param *par, int diff, int64_t ts)
{
pthread_mutex_lock(&trigger_lock);
if (current != NULL) {
current->tnum = par->tnum;
current->ts = ts;
current->diff = diff;
current = current->next;
}
spikes++;
pthread_mutex_unlock(&trigger_lock);
}
int main(int argc, char **argv)
{
sigset_t sigset;
int signum = SIGALRM;
int mode;
int max_cpus = sysconf(_SC_NPROCESSORS_ONLN);
int i, ret = -1;
int status;
process_options(argc, argv, max_cpus);
if (check_privs())
exit(EXIT_FAILURE);
if (verbose)
printf("Max CPUs = %d\n", max_cpus);
if (trigger) {
int retval;
retval = trigger_init();
if (retval != 0) {
fprintf(stderr, "trigger_init() failed\n");
exit(EXIT_FAILURE);
}
}
/* lock all memory (prevent swapping) */
if (lockall)
if (mlockall(MCL_CURRENT|MCL_FUTURE) == -1) {
perror("mlockall");
goto out;
}
/* use the /dev/cpu_dma_latency trick if it's there */
set_latency_target();
if (tracelimit)
enable_trace_mark();
if (check_timer())
warn("High resolution timers not available\n");
if (check_clock_resolution) {
int clock;
uint64_t diff;
int k;
uint64_t min_non_zero_diff = UINT64_MAX;
struct timespec now;
struct timespec prev;
uint64_t reported_resolution = UINT64_MAX;
struct timespec res;
struct timespec *time;
int times;
clock = clocksources[clocksel];
if (clock_getres(clock, &res)) {
warn("clock_getres failed");
} else {
reported_resolution = (NSEC_PER_SEC * res.tv_sec) + res.tv_nsec;
}
/*
* Calculate how many calls to clock_gettime are needed.
* Then call it that many times.
* Goal is to collect timestamps for ~ 0.001 sec.
* This will reliably capture resolution <= 500 usec.
*/
times = 1000;
clock_gettime(clock, &prev);
for (k=0; k < times; k++) {
clock_gettime(clock, &now);
}
diff = calcdiff_ns(now, prev);
if (diff == 0) {
/*
* No clock rollover occurred.
* Use the default value for times.
*/
times = -1;
} else {
int call_time;
call_time = diff / times; /* duration 1 call */
times = NSEC_PER_SEC / call_time; /* calls per second */
times /= 1000; /* calls per msec */
if (times < 1000)
times = 1000;
}
/* sanity check */
if ((times <= 0) || (times > 100000))
times = 100000;
time = calloc(times, sizeof(*time));
for (k=0; k < times; k++) {
clock_gettime(clock, &time[k]);
}
if (ct_debug) {
info("For %d consecutive calls to clock_gettime():\n", times);
info("time, delta time (nsec)\n");
}
prev = time[0];
for (k=1; k < times; k++) {
diff = calcdiff_ns(time[k], prev);
prev = time[k];
if (diff && (diff < min_non_zero_diff)) {
min_non_zero_diff = diff;
}
if (ct_debug)
info("%ld.%06ld %5llu\n",
time[k].tv_sec, time[k].tv_nsec,
(unsigned long long)diff);
}
free(time);
if (verbose ||
(min_non_zero_diff && (min_non_zero_diff > reported_resolution))) {
/*
* Measured clock resolution includes the time to call
* clock_gettime(), so it will be slightly larger than
* actual resolution.
*/
warn("reported clock resolution: %llu nsec\n",
(unsigned long long)reported_resolution);
warn("measured clock resolution approximately: %llu nsec\n",
(unsigned long long)min_non_zero_diff);
}
}
mode = use_nanosleep + use_system;
sigemptyset(&sigset);
sigaddset(&sigset, signum);
sigprocmask (SIG_BLOCK, &sigset, NULL);
signal(SIGINT, sighand);
signal(SIGTERM, sighand);
signal(SIGUSR1, sighand);
parameters = calloc(num_threads, sizeof(struct thread_param *));
if (!parameters)
goto out;
statistics = calloc(num_threads, sizeof(struct thread_stat *));
if (!statistics)
goto outpar;
for (i = 0; i < num_threads; i++) {
pthread_attr_t attr;
int node;
struct thread_param *par;
struct thread_stat *stat;
status = pthread_attr_init(&attr);
if (status != 0)
fatal("error from pthread_attr_init for thread %d: %s\n", i, strerror(status));
node = -1;
if (numa) {
void *stack;
void *currstk;
size_t stksize;
/* find the memory node associated with the cpu i */
node = rt_numa_numa_node_of_cpu(i);
/* get the stack size set for for this thread */
if (pthread_attr_getstack(&attr, &currstk, &stksize))
fatal("failed to get stack size for thread %d\n", i);
/* if the stack size is zero, set a default */
if (stksize == 0)
stksize = PTHREAD_STACK_MIN * 2;
/* allocate memory for a stack on appropriate node */
stack = rt_numa_numa_alloc_onnode(stksize, node, i);
/* touch the stack pages to pre-fault them in */
memset(stack, 0, stksize);
/* set the thread's stack */
if (pthread_attr_setstack(&attr, stack, stksize))
fatal("failed to set stack addr for thread %d to 0x%x\n",
i, stack+stksize);
}
/* allocate the thread's parameter block */
parameters[i] = par = threadalloc(sizeof(struct thread_param), node);
if (par == NULL)
fatal("error allocating thread_param struct for thread %d\n", i);
memset(par, 0, sizeof(struct thread_param));
/* allocate the thread's statistics block */
statistics[i] = stat = threadalloc(sizeof(struct thread_stat), node);
if (stat == NULL)
fatal("error allocating thread status struct for thread %d\n", i);
memset(stat, 0, sizeof(struct thread_stat));
/* allocate the histogram if requested */
if (histogram) {
int bufsize = histogram * sizeof(long);
stat->hist_array = threadalloc(bufsize, node);
stat->outliers = threadalloc(bufsize, node);
if (stat->hist_array == NULL || stat->outliers == NULL)
fatal("failed to allocate histogram of size %d on node %d\n",
histogram, i);
memset(stat->hist_array, 0, bufsize);
memset(stat->outliers, 0, bufsize);
}
if (verbose) {
int bufsize = VALBUF_SIZE * sizeof(long);
stat->values = threadalloc(bufsize, node);
if (!stat->values)
goto outall;
memset(stat->values, 0, bufsize);
par->bufmsk = VALBUF_SIZE - 1;
if (smi) {
int bufsize = VALBUF_SIZE * sizeof(long);
stat->smis = threadalloc(bufsize, node);
if (!stat->smis)
goto outall;
memset(stat->smis, 0, bufsize);
}
}
par->prio = priority;
if (priority && (policy == SCHED_FIFO || policy == SCHED_RR))
par->policy = policy;
else {
par->policy = SCHED_OTHER;
force_sched_other = 1;
}
if (priospread)
priority--;
par->clock = clocksources[clocksel];
par->mode = mode;
par->timermode = timermode;
par->signal = signum;
par->interval = interval;
if (!histogram) /* same interval on CPUs */
interval += distance;
if (verbose)
printf("Thread %d Interval: %d\n", i, interval);
par->max_cycles = max_cycles;
par->stats = stat;
par->node = node;
par->tnum = i;
switch (setaffinity) {
case AFFINITY_UNSPECIFIED: par->cpu = -1; break;
case AFFINITY_SPECIFIED:
par->cpu = cpu_for_thread(i, max_cpus);
if (verbose)
printf("Thread %d using cpu %d.\n", i,
par->cpu);
break;
case AFFINITY_USEALL: par->cpu = i % max_cpus; break;
}
stat->min = 1000000;
stat->max = 0;
stat->avg = 0.0;
stat->threadstarted = 1;
stat->smi_count = 0;
status = pthread_create(&stat->thread, &attr, timerthread, par);
if (status)
fatal("failed to create thread %d: %s\n", i, strerror(status));
}
if (use_fifo) {
status = pthread_create(&fifo_threadid, NULL, fifothread, NULL);
if (status)
fatal("failed to create fifo thread: %s\n", strerror(status));
}
while (!shutdown) {
char lavg[256];
int fd, len, allstopped = 0;
static char *policystr = NULL;
static char *slash = NULL;
static char *policystr2;
if (!policystr)
policystr = policyname(policy);
if (!slash) {
if (force_sched_other) {
slash = "/";
policystr2 = policyname(SCHED_OTHER);
} else
slash = policystr2 = "";
}
if (!verbose && !quiet) {
fd = open("/proc/loadavg", O_RDONLY, 0666);
len = read(fd, &lavg, 255);
close(fd);
lavg[len-1] = 0x0;
printf("policy: %s%s%s: loadavg: %s \n\n",
policystr, slash, policystr2, lavg);
}
for (i = 0; i < num_threads; i++) {
print_stat(stdout, parameters[i], i, verbose, quiet);
if(max_cycles && statistics[i]->cycles >= max_cycles)
allstopped++;
}
usleep(10000);
if (shutdown || allstopped)
break;
if (!verbose && !quiet)
printf("\033[%dA", num_threads + 2);
if (refresh_on_max) {
pthread_mutex_lock(&refresh_on_max_lock);
if (!shutdown)
pthread_cond_wait(&refresh_on_max_cond,
&refresh_on_max_lock);
pthread_mutex_unlock(&refresh_on_max_lock);
}
}
ret = EXIT_SUCCESS;
outall:
shutdown = 1;
usleep(50000);
if (!verbose && !quiet && refresh_on_max)
printf("\033[%dB", num_threads + 2);
if (quiet)
quiet = 2;
for (i = 0; i < num_threads; i++) {
if (statistics[i]->threadstarted > 0)
pthread_kill(statistics[i]->thread, SIGTERM);
if (statistics[i]->threadstarted) {
pthread_join(statistics[i]->thread, NULL);
if (quiet && !histogram)
print_stat(stdout, parameters[i], i, 0, 0);
}
if (statistics[i]->values)
threadfree(statistics[i]->values, VALBUF_SIZE*sizeof(long), parameters[i]->node);
}
if (trigger)
trigger_print();
if (histogram) {
print_hist(parameters, num_threads);
for (i = 0; i < num_threads; i++) {
threadfree(statistics[i]->hist_array, histogram*sizeof(long), parameters[i]->node);
threadfree(statistics[i]->outliers, histogram*sizeof(long), parameters[i]->node);
}
}
if (tracelimit) {
print_tids(parameters, num_threads);
if (break_thread_id) {
printf("# Break thread: %d\n", break_thread_id);
printf("# Break value: %llu\n", (unsigned long long)break_thread_value);
}
}
for (i=0; i < num_threads; i++) {
if (!statistics[i])
continue;
threadfree(statistics[i], sizeof(struct thread_stat), parameters[i]->node);
}
outpar:
for (i = 0; i < num_threads; i++) {
if (!parameters[i])
continue;
threadfree(parameters[i], sizeof(struct thread_param), parameters[i]->node);
}
out:
/* close any tracer file descriptors */
if (tracemark_fd >= 0)
close(tracemark_fd);
if (trace_fd >= 0)
close(trace_fd);
/* unlock everything */
if (lockall)
munlockall();
/* close the latency_target_fd if it's open */
if (latency_target_fd >= 0)
close(latency_target_fd);
if (affinity_mask)
rt_bitmask_free(affinity_mask);
exit(ret);
}
|