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trace: allow disabling events in events file

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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 <kraxel@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Gerd Hoffmann 2012-10-26 13:46:34 +02:00 committed by Stefan Hajnoczi
parent 81dee729c1
commit ddde8acc98
1 changed files with 8 additions and 1 deletions
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9
trace/control.c
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@ -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);