};
#define MAX_TRACES 50
-static struct unixctl_conn *backtrace_conn = NULL;
-static struct trace *traces = NULL;
-static size_t n_traces = 0;
+static struct trace traces[MAX_TRACES];
+static size_t trace_head = 0;
static void set_up_timer(void);
static void set_up_signal(int flags);
static void refresh_rusage(void);
static void timespec_add(struct timespec *sum,
const struct timespec *a, const struct timespec *b);
-static void trace_run(void);
static unixctl_cb_func backtrace_cb;
/* Initializes the timetracking module, if not already initialized. */
{
static bool inited;
- /* The best place to do this is probably a timeval_run() function.
- * However, none exists and this function is usually so fast that doing it
- * here seems fine for now. */
- trace_run();
-
if (inited) {
return;
}
inited = true;
+ memset(traces, 0, sizeof traces);
+
if (HAVE_EXECINFO_H && CACHE_TIME) {
unixctl_command_register("backtrace", "", 0, 0, backtrace_cb, NULL);
}
time_poll(struct pollfd *pollfds, int n_pollfds, long long int timeout_when,
int *elapsed)
{
- static long long int last_wakeup;
+ static long long int last_wakeup = 0;
long long int start;
sigset_t oldsigs;
bool blocked;
int retval;
time_refresh();
- log_poll_interval(last_wakeup);
+ if (last_wakeup) {
+ log_poll_interval(last_wakeup);
+ }
coverage_clear();
start = time_msec();
blocked = false;
break;
}
- if (!blocked && !CACHE_TIME) {
+ if (!blocked && CACHE_TIME) {
block_sigalrm(&oldsigs);
blocked = true;
}
monotonic_tick = true;
#if HAVE_EXECINFO_H
- if (backtrace_conn && n_traces < MAX_TRACES) {
- struct trace *trace = &traces[n_traces++];
+ if (CACHE_TIME) {
+ struct trace *trace = &traces[trace_head];
+
trace->n_frames = backtrace(trace->backtrace,
ARRAY_SIZE(trace->backtrace));
+ trace_head = (trace_head + 1) % MAX_TRACES;
}
#endif
}
static void
log_poll_interval(long long int last_wakeup)
{
- static unsigned int mean_interval; /* In 16ths of a millisecond. */
- static unsigned int n_samples;
-
- long long int now;
- unsigned int interval; /* In 16ths of a millisecond. */
-
- /* Compute interval from last wakeup to now in 16ths of a millisecond,
- * capped at 10 seconds (16000 in this unit). */
- now = time_msec();
- interval = MIN(10000, now - last_wakeup) << 4;
-
- /* Warn if we took too much time between polls: at least 50 ms and at least
- * 8X the mean interval. */
- if (n_samples > 10 && interval > mean_interval * 8 && interval > 50 * 16) {
- static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 3);
-
- if (!VLOG_DROP_WARN(&rl)) {
- const struct rusage *last_rusage = get_recent_rusage();
- struct rusage rusage;
-
- getrusage(RUSAGE_SELF, &rusage);
- VLOG_WARN("%lld ms poll interval (%lld ms user, %lld ms system) "
- "is over %u times the weighted mean interval %u ms "
- "(%u samples)",
- now - last_wakeup,
- timeval_diff_msec(&rusage.ru_utime,
- &last_rusage->ru_utime),
- timeval_diff_msec(&rusage.ru_stime,
- &last_rusage->ru_stime),
- interval / mean_interval,
- (mean_interval + 8) / 16, n_samples);
- if (rusage.ru_minflt > last_rusage->ru_minflt
- || rusage.ru_majflt > last_rusage->ru_majflt) {
- VLOG_WARN("faults: %ld minor, %ld major",
- rusage.ru_minflt - last_rusage->ru_minflt,
- rusage.ru_majflt - last_rusage->ru_majflt);
- }
- if (rusage.ru_inblock > last_rusage->ru_inblock
- || rusage.ru_oublock > last_rusage->ru_oublock) {
- VLOG_WARN("disk: %ld reads, %ld writes",
- rusage.ru_inblock - last_rusage->ru_inblock,
- rusage.ru_oublock - last_rusage->ru_oublock);
- }
- if (rusage.ru_nvcsw > last_rusage->ru_nvcsw
- || rusage.ru_nivcsw > last_rusage->ru_nivcsw) {
- VLOG_WARN("context switches: %ld voluntary, %ld involuntary",
- rusage.ru_nvcsw - last_rusage->ru_nvcsw,
- rusage.ru_nivcsw - last_rusage->ru_nivcsw);
- }
+ long long int interval = time_msec() - last_wakeup;
+
+ if (interval >= 1000) {
+ const struct rusage *last_rusage = get_recent_rusage();
+ struct rusage rusage;
+
+ getrusage(RUSAGE_SELF, &rusage);
+ VLOG_WARN("Unreasonably long %lldms poll interval"
+ " (%lldms user, %lldms system)",
+ interval,
+ timeval_diff_msec(&rusage.ru_utime,
+ &last_rusage->ru_utime),
+ timeval_diff_msec(&rusage.ru_stime,
+ &last_rusage->ru_stime));
+ if (rusage.ru_minflt > last_rusage->ru_minflt
+ || rusage.ru_majflt > last_rusage->ru_majflt) {
+ VLOG_WARN("faults: %ld minor, %ld major",
+ rusage.ru_minflt - last_rusage->ru_minflt,
+ rusage.ru_majflt - last_rusage->ru_majflt);
+ }
+ if (rusage.ru_inblock > last_rusage->ru_inblock
+ || rusage.ru_oublock > last_rusage->ru_oublock) {
+ VLOG_WARN("disk: %ld reads, %ld writes",
+ rusage.ru_inblock - last_rusage->ru_inblock,
+ rusage.ru_oublock - last_rusage->ru_oublock);
+ }
+ if (rusage.ru_nvcsw > last_rusage->ru_nvcsw
+ || rusage.ru_nivcsw > last_rusage->ru_nivcsw) {
+ VLOG_WARN("context switches: %ld voluntary, %ld involuntary",
+ rusage.ru_nvcsw - last_rusage->ru_nvcsw,
+ rusage.ru_nivcsw - last_rusage->ru_nivcsw);
}
coverage_log();
}
-
- /* Update exponentially weighted moving average. With these parameters, a
- * given value decays to 1% of its value in about 100 time steps. */
- if (n_samples++) {
- mean_interval = (mean_interval * 122 + interval * 6 + 64) / 128;
- } else {
- mean_interval = interval;
- }
}
\f
/* CPU usage tracking. */
}
static void
-trace_run(void)
+format_backtraces(struct ds *ds)
{
+ time_init();
+
#if HAVE_EXECINFO_H
- if (backtrace_conn && n_traces >= MAX_TRACES) {
- struct unixctl_conn *reply_conn = backtrace_conn;
- struct ds ds = DS_EMPTY_INITIALIZER;
+ if (CACHE_TIME) {
sigset_t oldsigs;
size_t i;
block_sigalrm(&oldsigs);
- for (i = 0; i < n_traces; i++) {
+ for (i = 0; i < MAX_TRACES; i++) {
struct trace *trace = &traces[i];
char **frame_strs;
size_t j;
+ if (!trace->n_frames) {
+ continue;
+ }
+
frame_strs = backtrace_symbols(trace->backtrace, trace->n_frames);
- ds_put_format(&ds, "Backtrace %zu\n", i + 1);
+ ds_put_format(ds, "Backtrace %zu\n", i + 1);
for (j = 0; j < trace->n_frames; j++) {
- ds_put_format(&ds, "%s\n", frame_strs[j]);
+ ds_put_format(ds, "%s\n", frame_strs[j]);
}
- ds_put_cstr(&ds, "\n");
+ ds_put_cstr(ds, "\n");
free(frame_strs);
}
-
- free(traces);
- traces = NULL;
- n_traces = 0;
- backtrace_conn = NULL;
-
+ ds_chomp(ds, '\n');
unblock_sigalrm(&oldsigs);
-
- unixctl_command_reply(reply_conn, ds_cstr(&ds));
- ds_destroy(&ds);
}
#endif
}
int argc OVS_UNUSED, const char *argv[] OVS_UNUSED,
void *aux OVS_UNUSED)
{
- sigset_t oldsigs;
+ struct ds ds = DS_EMPTY_INITIALIZER;
assert(HAVE_EXECINFO_H && CACHE_TIME);
-
- if (backtrace_conn) {
- unixctl_command_reply_error(conn, "In Use");
- return;
- }
- assert(!traces);
-
- block_sigalrm(&oldsigs);
- backtrace_conn = conn;
- traces = xmalloc(MAX_TRACES * sizeof *traces);
- n_traces = 0;
- unblock_sigalrm(&oldsigs);
+ format_backtraces(&ds);
+ unixctl_command_reply(conn, ds_cstr(&ds));
+ ds_destroy(&ds);
}
void
git://git.onelab.eu / sliver-openvswitch.git / blobdiff