/*
* Interface for configuring and controlling the state of tracing events.
*
- * Copyright (C) 2011-2014 Lluís Vilanova <vilanova@ac.upc.edu>
+ * Copyright (C) 2011-2016 Lluís Vilanova <vilanova@ac.upc.edu>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
#include "qemu/osdep.h"
#include "trace/control.h"
#include "qemu/help_option.h"
+#include "qemu/option.h"
#ifdef CONFIG_TRACE_SIMPLE
#include "trace/simple.h"
#endif
#ifdef CONFIG_TRACE_LOG
#include "qemu/log.h"
#endif
+#ifdef CONFIG_TRACE_SYSLOG
+#include <syslog.h>
+#endif
#include "qapi/error.h"
#include "qemu/error-report.h"
#include "qemu/config-file.h"
#include "monitor/monitor.h"
+#include "trace-root.h"
int trace_events_enabled_count;
-bool trace_events_dstate[TRACE_EVENT_COUNT];
+
+typedef struct TraceEventGroup {
+ TraceEvent **events;
+} TraceEventGroup;
+
+static TraceEventGroup *event_groups;
+static size_t nevent_groups;
+static uint32_t next_id;
+static uint32_t next_vcpu_id;
QemuOptsList qemu_trace_opts = {
.name = "trace",
};
+void trace_event_register_group(TraceEvent **events)
+{
+ size_t i;
+ for (i = 0; events[i] != NULL; i++) {
+ events[i]->id = next_id++;
+ if (events[i]->vcpu_id == TRACE_VCPU_EVENT_NONE) {
+ continue;
+ }
+
+ if (likely(next_vcpu_id < CPU_TRACE_DSTATE_MAX_EVENTS)) {
+ events[i]->vcpu_id = next_vcpu_id++;
+ } else {
+ warn_report("too many vcpu trace events; dropping '%s'",
+ events[i]->name);
+ }
+ }
+ event_groups = g_renew(TraceEventGroup, event_groups, nevent_groups + 1);
+ event_groups[nevent_groups].events = events;
+ nevent_groups++;
+}
+
+
TraceEvent *trace_event_name(const char *name)
{
assert(name != NULL);
- TraceEventID i;
- for (i = 0; i < trace_event_count(); i++) {
- TraceEvent *ev = trace_event_id(i);
+ TraceEventIter iter;
+ TraceEvent *ev;
+ trace_event_iter_init(&iter, NULL);
+ while ((ev = trace_event_iter_next(&iter)) != NULL) {
if (strcmp(trace_event_get_name(ev), name) == 0) {
return ev;
}
}
}
-TraceEvent *trace_event_pattern(const char *pat, TraceEvent *ev)
-{
- assert(pat != NULL);
- TraceEventID i;
-
- if (ev == NULL) {
- i = -1;
- } else {
- i = trace_event_get_id(ev);
- }
- i++;
+void trace_event_iter_init(TraceEventIter *iter, const char *pattern)
+{
+ iter->event = 0;
+ iter->group = 0;
+ iter->pattern = pattern;
+}
- while (i < trace_event_count()) {
- TraceEvent *res = trace_event_id(i);
- if (pattern_glob(pat, trace_event_get_name(res))) {
- return res;
+TraceEvent *trace_event_iter_next(TraceEventIter *iter)
+{
+ while (iter->group < nevent_groups &&
+ event_groups[iter->group].events[iter->event] != NULL) {
+ TraceEvent *ev = event_groups[iter->group].events[iter->event];
+ iter->event++;
+ if (event_groups[iter->group].events[iter->event] == NULL) {
+ iter->event = 0;
+ iter->group++;
+ }
+ if (!iter->pattern ||
+ pattern_glob(iter->pattern,
+ trace_event_get_name(ev))) {
+ return ev;
}
- i++;
}
return NULL;
void trace_list_events(void)
{
- int i;
- for (i = 0; i < trace_event_count(); i++) {
- TraceEvent *res = trace_event_id(i);
- fprintf(stderr, "%s\n", trace_event_get_name(res));
+ TraceEventIter iter;
+ TraceEvent *ev;
+ trace_event_iter_init(&iter, NULL);
+ while ((ev = trace_event_iter_next(&iter)) != NULL) {
+ fprintf(stderr, "%s\n", trace_event_get_name(ev));
}
}
{
const bool enable = ('-' != line_buf[0]);
const char *line_ptr = enable ? line_buf : line_buf + 1;
+ TraceEventIter iter;
+ TraceEvent *ev;
+ bool is_pattern = trace_event_is_pattern(line_ptr);
- if (trace_event_is_pattern(line_ptr)) {
- TraceEvent *ev = NULL;
- while ((ev = trace_event_pattern(line_ptr, ev)) != NULL) {
- if (trace_event_get_state_static(ev)) {
- trace_event_set_state_dynamic(ev, enable);
+ trace_event_iter_init(&iter, line_ptr);
+ while ((ev = trace_event_iter_next(&iter)) != NULL) {
+ if (!trace_event_get_state_static(ev)) {
+ if (!is_pattern) {
+ warn_report("trace event '%s' is not traceable",
+ line_ptr);
+ return;
}
+ continue;
}
- } else {
- TraceEvent *ev = trace_event_name(line_ptr);
- if (ev == NULL) {
- error_report("WARNING: trace event '%s' does not exist",
- line_ptr);
- } else if (!trace_event_get_state_static(ev)) {
- error_report("WARNING: trace event '%s' is not traceable",
- line_ptr);
- } else {
- trace_event_set_state_dynamic(ev, enable);
+
+ /* start tracing */
+ trace_event_set_state_dynamic(ev, enable);
+ if (!is_pattern) {
+ return;
}
}
+
+ if (!is_pattern) {
+ warn_report("trace event '%s' does not exist",
+ line_ptr);
+ }
}
void trace_enable_events(const char *line_buf)
#ifdef CONFIG_TRACE_SIMPLE
st_set_trace_file(file);
#elif defined CONFIG_TRACE_LOG
- /* If both the simple and the log backends are enabled, "-trace file"
+ /* If both the simple and the log backends are enabled, "--trace file"
* only applies to the simple backend; use "-D" for the log backend.
*/
if (file) {
}
#else
if (file) {
- fprintf(stderr, "error: -trace file=...: "
+ fprintf(stderr, "error: --trace file=...: "
"option not supported by the selected tracing backends\n");
exit(1);
}
#endif
}
+void trace_fini_vcpu(CPUState *vcpu)
+{
+ TraceEventIter iter;
+ TraceEvent *ev;
+
+ trace_guest_cpu_exit(vcpu);
+
+ trace_event_iter_init(&iter, NULL);
+ while ((ev = trace_event_iter_next(&iter)) != NULL) {
+ if (trace_event_is_vcpu(ev) &&
+ trace_event_get_state_static(ev) &&
+ trace_event_get_vcpu_state_dynamic(vcpu, ev)) {
+ /* must disable to affect the global counter */
+ trace_event_set_vcpu_state_dynamic(vcpu, ev, false);
+ }
+ }
+}
+
bool trace_init_backends(void)
{
#ifdef CONFIG_TRACE_SIMPLE
}
#endif
+#ifdef CONFIG_TRACE_SYSLOG
+ openlog(NULL, LOG_PID, LOG_DAEMON);
+#endif
+
return true;
}
return trace_file;
}
+
+uint32_t trace_get_vcpu_event_count(void)
+{
+ return next_vcpu_id;
+}
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