It would be convinient to enable tracepoints in qemu-io binary. This would
allow to perform investigations without additional code recompilations.
The command line will be exactly the same as in qemu-system.
Signed-off-by: Denis V. Lunev <d...@openvz.org>
CC: Kevin Wolf <kw...@redhat.com>
CC: Paolo Bonzini <pbonz...@redhat.com>
---
qemu-io.c | 43 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 43 insertions(+)
diff --git a/qemu-io.c b/qemu-io.c
index 5ef3ef7..2d0d2b0 100644
--- a/qemu-io.c
+++ b/qemu-io.c
@@ -18,6 +18,7 @@
#include "qemu/option.h"
#include "qemu/config-file.h"
#include "qemu/readline.h"
+#include "qemu/log.h"
#include "qapi/qmp/qstring.h"
#include "qom/object_interfaces.h"
#include "sysemu/block-backend.h"
@@ -419,6 +420,25 @@ static QemuOptsList qemu_object_opts = {
},
};
+static QemuOptsList qemu_trace_opts = {
+ .name = "trace",
+ .implied_opt_name = "enable",
+ .head = QTAILQ_HEAD_INITIALIZER(qemu_trace_opts.head),
+ .desc = {
+ {
+ .name = "enable",
+ .type = QEMU_OPT_STRING,
+ },
+ {
+ .name = "events",
+ .type = QEMU_OPT_STRING,
+ },{
+ .name = "file",
+ .type = QEMU_OPT_STRING,
+ },
+ { /* end of list */ }
+ },
+};
static QemuOptsList file_opts = {
.name = "file",
@@ -473,6 +493,7 @@ int main(int argc, char **argv)
module_call_init(MODULE_INIT_QOM);
qemu_add_opts(&qemu_object_opts);
+ qemu_add_opts(&qemu_trace_opts);
bdrv_init();
while ((c = getopt_long(argc, argv, sopt, lopt, &opt_index)) != -1) {
@@ -512,10 +533,32 @@ int main(int argc, char **argv)
}
break;
case 'T':
+ {
+ QemuOpts *trace_opts;
+ char *trace_file;
+
+ trace_opts = qemu_opts_parse_noisily(qemu_find_opts("trace"),
+ optarg, true);
+ if (trace_opts == NULL) {
+ exit(1);
+ }
+ if (qemu_opt_get(trace_opts, "enable")) {
+ trace_enable_events(qemu_opt_get(trace_opts, "enable"));
+ }
+ trace_init_events(qemu_opt_get(trace_opts, "events"));
+
+ trace_file = g_strdup(qemu_opt_get(trace_opts, "file"));
+ qemu_opts_del(trace_opts);
+
if (!trace_init_backends()) {
exit(1); /* error message will have been printed */
}
+ trace_init_file(trace_file);
+ g_free(trace_file);
+
+ qemu_set_log(LOG_TRACE);
break;
+ }
case 'V':
printf("%s version %s\n", progname, QEMU_VERSION);
exit(0);
--
2.5.0
