#include "dummy.h"
#include "dynamic-string.h"
#include "fatal-signal.h"
+#include "hash.h"
+#include "hmap.h"
#include "signals.h"
#include "unixctl.h"
#include "util.h"
#include "vlog.h"
-#ifndef HAVE_EXECINFO_H
-#define HAVE_EXECINFO_H 0
-#endif
-
VLOG_DEFINE_THIS_MODULE(timeval);
/* The clock to use for measuring time intervals. This is CLOCK_MONOTONIC by
struct trace {
void *backtrace[32]; /* Populated by backtrace(). */
size_t n_frames; /* Number of frames in 'backtrace'. */
+
+ /* format_backtraces() helper data. */
+ struct hmap_node node;
+ size_t count;
};
#define MAX_TRACES 50
const struct timespec *a, const struct timespec *b);
static unixctl_cb_func backtrace_cb;
+#ifndef HAVE_EXECINFO_H
+#define HAVE_EXECINFO_H 0
+
+static int
+backtrace(void **buffer OVS_UNUSED, int size OVS_UNUSED)
+{
+ NOT_REACHED();
+}
+
+static char **
+backtrace_symbols(void *const *buffer OVS_UNUSED, int size OVS_UNUSED)
+{
+ NOT_REACHED();
+}
+#endif
+
/* Initializes the timetracking module, if not already initialized. */
static void
time_init(void)
wall_tick = true;
monotonic_tick = true;
-#if HAVE_EXECINFO_H
- if (CACHE_TIME) {
+ if (HAVE_EXECINFO_H && 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
return cpu_usage;
}
+static uint32_t
+hash_trace(struct trace *trace)
+{
+ return hash_bytes(trace->backtrace,
+ trace->n_frames * sizeof *trace->backtrace, 0);
+}
+
+static struct trace *
+trace_map_lookup(struct hmap *trace_map, struct trace *key)
+{
+ struct trace *value;
+
+ HMAP_FOR_EACH_WITH_HASH (value, node, hash_trace(key), trace_map) {
+ if (key->n_frames == value->n_frames
+ && !memcmp(key->backtrace, value->backtrace,
+ key->n_frames * sizeof *key->backtrace)) {
+ return value;
+ }
+ }
+ return NULL;
+}
+
+
static void
format_backtraces(struct ds *ds)
{
time_init();
-#if HAVE_EXECINFO_H
- if (CACHE_TIME) {
+ if (HAVE_EXECINFO_H && CACHE_TIME) {
+ struct hmap trace_map = HMAP_INITIALIZER(&trace_map);
+ struct trace *trace, *next;
sigset_t oldsigs;
size_t i;
for (i = 0; i < MAX_TRACES; i++) {
struct trace *trace = &traces[i];
- char **frame_strs;
- size_t j;
+ struct trace *map_trace;
if (!trace->n_frames) {
continue;
}
+ map_trace = trace_map_lookup(&trace_map, trace);
+ if (map_trace) {
+ map_trace->count++;
+ } else {
+ hmap_insert(&trace_map, &trace->node, hash_trace(trace));
+ trace->count = 1;
+ }
+ }
+
+ HMAP_FOR_EACH_SAFE (trace, next, node, &trace_map) {
+ char **frame_strs;
+ size_t j;
+
+ hmap_remove(&trace_map, &trace->node);
+
frame_strs = backtrace_symbols(trace->backtrace, trace->n_frames);
- ds_put_format(ds, "Backtrace %zu\n", i + 1);
+ ds_put_format(ds, "Count %zu\n", trace->count);
for (j = 0; j < trace->n_frames; j++) {
ds_put_format(ds, "%s\n", frame_strs[j]);
}
free(frame_strs);
}
+ hmap_destroy(&trace_map);
+
ds_chomp(ds, '\n');
unblock_sigalrm(&oldsigs);
}
-#endif
}
\f
/* Unixctl interface. */