[Qemu-devel] [PATCH v2 03/10] trace: [tcg] Identify events with the 'vcpu' property

["Lluís Vilanova" <vilanova@ac.upc.edu>]

A separate ID space ('TRACE_CPU_*') is used in attribute 'cpu_id' that
only contains events with the 'vcpu' property.

These are later used to select the appropriate physical TB cache based
on what events are active.

Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
---
 qapi/trace.json                      |    5 +++--
 scripts/tracetool/format/events_c.py |   11 +++++++++--
 scripts/tracetool/format/events_h.py |   14 ++++++++++++--
 trace/control-internal.h             |    8 +++++++-
 trace/control.h                      |    7 +++++++
 trace/event-internal.h               |    4 +++-
 trace/qmp.c                          |    3 ++-
 7 files changed, 43 insertions(+), 9 deletions(-)

diff --git a/qapi/trace.json b/qapi/trace.json
index 01b0a52..71cb96f 100644
--- a/qapi/trace.json
+++ b/qapi/trace.json
@@ -1,6 +1,6 @@
 # -*- mode: python -*-
 #
-# Copyright (C) 2011-2014 Lluís Vilanova <vilanova@ac.upc.edu>
+# Copyright (C) 2011-2015 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.
@@ -29,11 +29,12 @@
 #
 # @name: Event name.
 # @state: Tracing state.
+# @vcpu: Whether this is a per-vCPU event (since 2.5).
 #
 # Since 2.2
 ##
 { 'struct': 'TraceEventInfo',
-  'data': {'name': 'str', 'state': 'TraceEventState'} }
+  'data': {'name': 'str', 'state': 'TraceEventState', 'vcpu': 'bool'} }
 
 ##
 # @trace-event-get-state:
diff --git a/scripts/tracetool/format/events_c.py b/scripts/tracetool/format/events_c.py
index 2d97fa3..e0ff73a 100644
--- a/scripts/tracetool/format/events_c.py
+++ b/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 2012-2015, Lluís Vilanova <vilanova@ac.upc.edu>"
 __license__    = "GPL version 2 or (at your option) any later version"
 
 __maintainer__ = "Stefan Hajnoczi"
@@ -27,8 +27,15 @@ 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, .dstate = 0 },',
+        if "vcpu" in e.properties and "tcg-exec" in e.properties:
+            vcpu_id = "TRACE_CPU_" + e.name.upper()
+        else:
+            vcpu_id = "TRACE_CPU_EVENT_COUNT"
+        out('    { .id = %(id)s, .cpu_id = %(vcpu_id)s,'
+            ' .name = \"%(name)s\",'
+            ' .sstate = %(sstate)s, .dstate = 0 },',
             id = "TRACE_" + e.name.upper(),
+            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 9f114a3..f260090 100644
--- a/scripts/tracetool/format/events_h.py
+++ b/scripts/tracetool/format/events_h.py
@@ -6,7 +6,7 @@ trace/generated-events.h
 """
 
 __author__     = "Lluís Vilanova <vilanova@ac.upc.edu>"
-__copyright__  = "Copyright 2012-2014, Lluís Vilanova <vilanova@ac.upc.edu>"
+__copyright__  = "Copyright 2012-2015, Lluís Vilanova <vilanova@ac.upc.edu>"
 __license__    = "GPL version 2 or (at your option) any later version"
 
 __maintainer__ = "Stefan Hajnoczi"
@@ -34,13 +34,23 @@ 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 and "tcg-exec" in e.properties:
+            out('    TRACE_CPU_%s,' % e.name.upper())
+
+    out('    TRACE_CPU_EVENT_COUNT',
+        '} TraceEventCPUID;')
+
     # 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.original.name.upper(),
diff --git a/trace/control-internal.h b/trace/control-internal.h
index 5a8df28..70e55df 100644
--- a/trace/control-internal.h
+++ b/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) 2011-2015 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.
@@ -39,6 +39,12 @@ static inline TraceEventID trace_event_get_id(TraceEvent *ev)
     return ev->id;
 }
 
+static inline TraceEventCPUID trace_event_get_cpu_id(TraceEvent *ev)
+{
+    assert(ev != NULL);
+    return ev->cpu_id;
+}
+
 static inline const char * trace_event_get_name(TraceEvent *ev)
 {
     assert(ev != NULL);
diff --git a/trace/control.h b/trace/control.h
index 275a086..a0bfd3e 100644
--- a/trace/control.h
+++ b/trace/control.h
@@ -87,6 +87,13 @@ static TraceEventID trace_event_count(void);
 static TraceEventID trace_event_get_id(TraceEvent *ev);
 
 /**
+ * trace_event_get_cpu_id:
+ *
+ * Get the per-vCPU identifier of an event.
+ */
+static TraceEventCPUID trace_event_get_cpu_id(TraceEvent *ev);
+
+/**
  * trace_event_get_name:
  *
  * Get the name of an event.
diff --git a/trace/event-internal.h b/trace/event-internal.h
index b2310d9..ae18b48 100644
--- a/trace/event-internal.h
+++ b/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) 2012-2015 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.
+ * @cpu_id: Unique per-vCPU event identifier.
  * @name: Event name.
  * @sstate: Static tracing state.
  * @dstate: Dynamic tracing state.
@@ -24,6 +25,7 @@
  */
 typedef struct TraceEvent {
     TraceEventID id;
+    TraceEventCPUID cpu_id;
     const char * name;
     const bool sstate;
     bool dstate;
diff --git a/trace/qmp.c b/trace/qmp.c
index 0b19489..b5a5020 100644
--- a/trace/qmp.c
+++ b/trace/qmp.c
@@ -1,7 +1,7 @@
 /*
  * QMP commands for tracing events.
  *
- * Copyright (C) 2014 Lluís Vilanova <vilanova@ac.upc.edu>
+ * Copyright (C) 2014-2015 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.
@@ -22,6 +22,7 @@ TraceEventInfoList *qmp_trace_event_get_state(const char *name, Error **errp)
     while ((ev = trace_event_pattern(name, ev)) != NULL) {
         TraceEventInfoList *elem = g_new(TraceEventInfoList, 1);
         elem->value = g_new(TraceEventInfo, 1);
+        elem->value->vcpu = trace_event_get_cpu_id(ev) != TRACE_CPU_EVENT_COUNT;
         elem->value->name = g_strdup(trace_event_get_name(ev));
         if (!trace_event_get_state_static(ev)) {
             elem->value->state = TRACE_EVENT_STATE_UNAVAILABLE;