From: Gerd Hoffmann <kra...@redhat.com>
Disable trace events prefixed with a '-'. Useful
to enable a group of tracepoints with exceptions,
like this:
usb_xhci_port_*
-usb_xhci_port_read
which will enable all xhci port tracepoints except reads.
Signed-off-by: Gerd Hoffmann <kra...@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefa...@redhat.com>
---
trace/control.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/trace/control.c b/trace/control.c
index 22d5863..be05efb 100644
--- a/trace/control.c
+++ b/trace/control.c
@@ -12,6 +12,8 @@
void trace_backend_init_events(const char *fname)
{
+ int ret;
+
if (fname == NULL) {
return;
}
@@ -30,7 +32,12 @@ void trace_backend_init_events(const char *fname)
if ('#' == line_buf[0]) { /* skip commented lines */
continue;
}
- if (!trace_event_set_state(line_buf, true)) {
+ if ('-' == line_buf[0]) {
+ ret = trace_event_set_state(line_buf+1, false);
+ } else {
+ ret = trace_event_set_state(line_buf, true);
+ }
+ if (!ret) {
fprintf(stderr,
"error: trace event '%s' does not exist\n", line_buf);
exit(1);
--
1.8.0
