trace: Identify events with the 'vcpu' property

A new event attribute 'cpu_id' is added to have a separate ID
space ('TRACE_VCPU_*') for all events with the 'vcpu' property.

These are later used to identify which events are enabled on each vCPU.

Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

scripts/tracetool/format/events_c.py

@@ -6,7 +6,7 @@ trace/generated-events.c
 """
 
 __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"
@@ -28,8 +28,15 @@ def generate(events, backend):
     out('TraceEvent trace_events[TRACE_EVENT_COUNT] = {')
 
     for e in events:
-        out('    { .id = %(id)s, .name = \"%(name)s\", .sstate = %(sstate)s },',
+        if "vcpu" in e.properties:
+            vcpu_id = "TRACE_VCPU_" + e.name.upper()
+        else:
+            vcpu_id = "TRACE_VCPU_EVENT_COUNT"
+        out('    { .id = %(id)s, .vcpu_id = %(vcpu_id)s,'
+            ' .name = \"%(name)s\",'
+            ' .sstate = %(sstate)s },',
             id = "TRACE_" + e.name.upper(),
+            vcpu_id = vcpu_id,
             name = e.name,
             sstate = "TRACE_%s_ENABLED" % e.name.upper())
 

scripts/tracetool/format/events_h.py

@@ -32,13 +32,23 @@ def generate(events, backend):
     out('    TRACE_EVENT_COUNT',
         '} TraceEventID;')
 
+    # per-vCPU event identifiers
+    out('typedef enum {')
+
+    for e in events:
+        if "vcpu" in e.properties:
+            out('    TRACE_VCPU_%s,' % e.name.upper())
+
+    out('    TRACE_VCPU_EVENT_COUNT',
+        '} TraceEventVCPUID;')
+
     # static state
     for e in events:
         if 'disable' in e.properties:
             enabled = 0
         else:
             enabled = 1
-        if "tcg-trans" in e.properties:
+        if "tcg-exec" in e.properties:
             # a single define for the two "sub-events"
             out('#define TRACE_%(name)s_ENABLED %(enabled)d',
                 name=e.original.name.upper(),

trace/control-internal.h

@@ -1,7 +1,7 @@
 /*
  * Interface for configuring and controlling the state of tracing events.
  *
- * Copyright (C) 2011-2014 Lluís Vilanova <vilanova@ac.upc.edu>
+ * Copyright (C) 2011-2016 Lluís Vilanova <vilanova@ac.upc.edu>
  *
  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  * See the COPYING file in the top-level directory.
@@ -38,6 +38,16 @@ static inline TraceEventID trace_event_get_id(TraceEvent *ev)
     return ev->id;
 }
 
+static inline TraceEventVCPUID trace_event_get_vcpu_id(TraceEvent *ev)
+{
+    return ev->vcpu_id;
+}
+
+static inline bool trace_event_is_vcpu(TraceEvent *ev)
+{
+    return ev->vcpu_id != TRACE_VCPU_EVENT_COUNT;
+}
+
 static inline const char * trace_event_get_name(TraceEvent *ev)
 {
     assert(ev != NULL);

trace/control.h

@@ -85,6 +85,23 @@ static TraceEventID trace_event_count(void);
  */
 static TraceEventID trace_event_get_id(TraceEvent *ev);
 
+/**
+ * trace_event_get_vcpu_id:
+ *
+ * Get the per-vCPU identifier of an event.
+ *
+ * Special value #TRACE_VCPU_EVENT_COUNT means the event is not vCPU-specific
+ * (does not have the "vcpu" property).
+ */
+static TraceEventVCPUID trace_event_get_vcpu_id(TraceEvent *ev);
+
+/**
+ * trace_event_is_vcpu:
+ *
+ * Whether this is a per-vCPU event.
+ */
+static bool trace_event_is_vcpu(TraceEvent *ev);
+
 /**
  * trace_event_get_name:
  *

trace/event-internal.h

@@ -1,7 +1,7 @@
 /*
  * Interface for configuring and controlling the state of tracing events.
  *
- * Copyright (C) 2012 Lluís Vilanova <vilanova@ac.upc.edu>
+ * Copyright (C) 2012-2016 Lluís Vilanova <vilanova@ac.upc.edu>
  *
  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  * See the COPYING file in the top-level directory.
@@ -16,6 +16,7 @@
 /**
  * TraceEvent:
  * @id: Unique event identifier.
+ * @vcpu_id: Unique per-vCPU event identifier.
  * @name: Event name.
  * @sstate: Static tracing state.
  *
@@ -23,6 +24,7 @@
  */
 typedef struct TraceEvent {
     TraceEventID id;
+    TraceEventVCPUID vcpu_id;
     const char * name;
     const bool sstate;
 } TraceEvent;