diff options
| author | Lluís Vilanova <vilanova@ac.upc.edu> | 2016-07-11 12:53:46 +0200 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2016-07-18 18:23:12 +0100 |
| commit | 40b9cd25f789e02145fda5e1f3fde7e7dd9e3b61 (patch) | |
| tree | a88b3cbcc13588e5234bddaa84bb2790c743eab5 /scripts/tracetool/backend/ftrace.py | |
| parent | 4815185902971c41fcdd700fa1fc3e1d9299900f (diff) | |
trace: Conditionally trace events based on their per-vCPU state
Events with the 'vcpu' property are conditionally emitted according to
their per-vCPU state. Other events are emitted normally based on their
global tracing state.
Note that the per-vCPU condition check applies to all tracing backends.
Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'scripts/tracetool/backend/ftrace.py')
| -rw-r--r-- | scripts/tracetool/backend/ftrace.py | 20 |
1 files changed, 10 insertions, 10 deletions
diff --git a/scripts/tracetool/backend/ftrace.py b/scripts/tracetool/backend/ftrace.py index d798c71347..80dcf30478 100644 --- a/scripts/tracetool/backend/ftrace.py +++ b/scripts/tracetool/backend/ftrace.py @@ -30,17 +30,17 @@ def generate_h(event): if len(event.args) > 0: argnames = ", " + argnames - out(' {', - ' char ftrace_buf[MAX_TRACE_STRLEN];', - ' int unused __attribute__ ((unused));', - ' int trlen;', - ' if (trace_event_get_state(%(event_id)s)) {', - ' trlen = snprintf(ftrace_buf, MAX_TRACE_STRLEN,', - ' "%(name)s " %(fmt)s "\\n" %(argnames)s);', - ' trlen = MIN(trlen, MAX_TRACE_STRLEN - 1);', - ' unused = write(trace_marker_fd, ftrace_buf, trlen);', + out(' {', + ' char ftrace_buf[MAX_TRACE_STRLEN];', + ' int unused __attribute__ ((unused));', + ' int trlen;', + ' if (trace_event_get_state(%(event_id)s)) {', + ' trlen = snprintf(ftrace_buf, MAX_TRACE_STRLEN,', + ' "%(name)s " %(fmt)s "\\n" %(argnames)s);', + ' trlen = MIN(trlen, MAX_TRACE_STRLEN - 1);', + ' unused = write(trace_marker_fd, ftrace_buf, trlen);', + ' }', ' }', - ' }', name=event.name, args=event.args, event_id="TRACE_" + event.name.upper(), |