From patchwork Tue Oct 30 14:26:54 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [22/22] trace: allow disabling events in events file From: Gerd Hoffmann X-Patchwork-Id: 195515 Message-Id: <1351607214-4007-23-git-send-email-kraxel@redhat.com> To: qemu-devel@nongnu.org Cc: Gerd Hoffmann Date: Tue, 30 Oct 2012 15:26:54 +0100 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 --- trace/control.c | 9 ++++++++- 1 files changed, 8 insertions(+), 1 deletions(-) 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);