[Qemu-devel] [PATCH v6 15/20] trace: dynamically allocate event IDs at runtime

["Daniel P. Berrange" <berrange@redhat.com>]

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>
---
 scripts/tracetool/format/events_c.py | 10 ++--------
 scripts/tracetool/format/events_h.py |  4 ----
 trace/control.c                      | 11 ++++++++++-
 3 files changed, 12 insertions(+), 13 deletions(-)

diff --git a/scripts/tracetool/format/events_c.py b/scripts/tracetool/format/events_c.py
index 8817555..a976c22 100644
--- a/scripts/tracetool/format/events_c.py
+++ b/scripts/tracetool/format/events_c.py
@@ -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(),
diff --git a/scripts/tracetool/format/events_h.py b/scripts/tracetool/format/events_h.py
index ca6d730..1cb332b 100644
--- a/scripts/tracetool/format/events_h.py
+++ b/scripts/tracetool/format/events_h.py
@@ -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:
diff --git a/trace/control.c b/trace/control.c
index 5f10e2d..1a7bee6 100644
--- a/trace/control.c
+++ b/trace/control.c
@@ -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;
 }
-- 
2.7.4