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/log.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/log.py')
| -rw-r--r-- | scripts/tracetool/backend/log.py | 26 |
1 files changed, 16 insertions, 10 deletions
diff --git a/scripts/tracetool/backend/log.py b/scripts/tracetool/backend/log.py index e409b7326e..b3ff064011 100644 --- a/scripts/tracetool/backend/log.py +++ b/scripts/tracetool/backend/log.py @@ -6,7 +6,7 @@ Stderr built-in backend. """ __author__ = "Lluís Vilanova <vilanova@ac.upc.edu>" -__copyright__ = "Copyright 2012-2014, Lluís Vilanova <vilanova@ac.upc.edu>" +__copyright__ = "Copyright 2012-2016, Lluís Vilanova <vilanova@ac.upc.edu>" __license__ = "GPL version 2 or (at your option) any later version" __maintainer__ = "Stefan Hajnoczi" @@ -30,15 +30,21 @@ def generate_h(event): if len(event.args) > 0: argnames = ", " + argnames - out(' if (trace_event_get_state(%(event_id)s)) {', - ' struct timeval _now;', - ' gettimeofday(&_now, NULL);', - ' qemu_log_mask(LOG_TRACE, "%%d@%%zd.%%06zd:%(name)s " %(fmt)s "\\n",', - ' getpid(),', - ' (size_t)_now.tv_sec, (size_t)_now.tv_usec', - ' %(argnames)s);', - ' }', - event_id="TRACE_" + event.name.upper(), + if "vcpu" in event.properties: + # already checked on the generic format code + cond = "true" + else: + cond = "trace_event_get_state(%s)" % ("TRACE_" + event.name.upper()) + + out(' if (%(cond)s) {', + ' struct timeval _now;', + ' gettimeofday(&_now, NULL);', + ' qemu_log_mask(LOG_TRACE, "%%d@%%zd.%%06zd:%(name)s " %(fmt)s "\\n",', + ' getpid(),', + ' (size_t)_now.tv_sec, (size_t)_now.tv_usec', + ' %(argnames)s);', + ' }', + cond=cond, name=event.name, fmt=event.fmt.rstrip("\n"), argnames=argnames) |