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trace: dynamically allocate event IDs at runtime

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Instead of having the code generator assign event IDs and
event VCPU IDs, assign them when the events are registered
at runtime. This will allow code to be generated from
individual trace-events without having to figure out
globally unique numbering at build time.

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Lluís Vilanova <vilanova@ac.upc.edu>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Message-id: 1475588159-30598-16-git-send-email-berrange@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Daniel P. Berrange 2016-10-04 14:35:54 +01:00 committed by Stefan Hajnoczi
parent b7d48952c3
commit ca3fa0e88f
3 changed files with 12 additions and 13 deletions
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10
scripts/tracetool/format/events_c.py
View file

@ -28,25 +28,19 @@ def generate(events, backend):
for e in events:
out('uint16_t %s;' % e.api(e.QEMU_DSTATE))
next_id = 0
next_vcpu_id = 0
for e in events:
id = next_id
next_id += 1
if "vcpu" in e.properties:
vcpu_id = next_vcpu_id
next_vcpu_id += 1
vcpu_id = 0
else:
vcpu_id = "TRACE_VCPU_EVENT_NONE"
out('TraceEvent %(event)s = {',
' .id = %(id)s,',
' .id = 0,',
' .vcpu_id = %(vcpu_id)s,',
' .name = \"%(name)s\",',
' .sstate = %(sstate)s,',
' .dstate = &%(dstate)s ',
'};',
event = e.api(e.QEMU_EVENT),
id = id,
vcpu_id = vcpu_id,
name = e.name,
sstate = "TRACE_%s_ENABLED" % e.name.upper(),

4
scripts/tracetool/format/events_h.py
View file

@ -32,10 +32,6 @@ def generate(events, backend):
for e in events:
out('extern uint16_t %s;' % e.api(e.QEMU_DSTATE))
numvcpu = len([e for e in events if "vcpu" in e.properties])
out("#define TRACE_VCPU_EVENT_COUNT %d" % numvcpu)
# static state
for e in events:
if 'disable' in e.properties:

11
trace/control.c
View file

@ -35,6 +35,8 @@ typedef struct TraceEventGroup {
static TraceEventGroup *event_groups;
static size_t nevent_groups;
static uint32_t next_id;
static uint32_t next_vcpu_id;
QemuOptsList qemu_trace_opts = {
.name = "trace",
@ -59,6 +61,13 @@ QemuOptsList qemu_trace_opts = {
void trace_event_register_group(TraceEvent **events)
{
size_t i;
for (i = 0; events[i] != NULL; i++) {
events[i]->id = next_id++;
if (events[i]->vcpu_id != TRACE_VCPU_EVENT_NONE) {
events[i]->vcpu_id = next_vcpu_id++;
}
}
event_groups = g_renew(TraceEventGroup, event_groups, nevent_groups + 1);
event_groups[nevent_groups].events = events;
nevent_groups++;
@ -293,5 +302,5 @@ char *trace_opt_parse(const char *optarg)
uint32_t trace_get_vcpu_event_count(void)
{
return TRACE_VCPU_EVENT_COUNT;
return next_vcpu_id;
}