This is not meant to be applied but included as a reference.
Signed-off-by: Anthony Liguori <aligu...@us.ibm.com>
---
qom/object.c | 88 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 88 insertions(+)
diff --git a/qom/object.c b/qom/object.c
index ec88231..2bfdcda 100644
--- a/qom/object.c
+++ b/qom/object.c
@@ -136,12 +136,33 @@ TypeImpl *type_register_static(const TypeInfo *info)
return type_register(info);
}
+#ifdef CONFIG_QOM_CAST_STATS
+typedef struct CastStats
+{
+ uint64_t total;
+ uint64_t miss;
+ uint64_t hit;
+ uint64_t rebalance;
+ uint64_t lookups;
+ uint64_t class;
+} CastStats;
+
+#define CAST_STATS_DUMP_INTERVAL 1000000
+
+static CastStats cast_stats;
+static qemu_timeval cast_stats_ts;
+#endif
+
static TypeImpl *type_get_by_name(const char *name)
{
if (name == NULL) {
return NULL;
}
+#ifdef CONFIG_QOM_CAST_STATS
+ cast_stats.lookups++;
+#endif
+
return type_table_lookup(name);
}
@@ -432,6 +453,43 @@ Object *object_dynamic_cast(Object *obj, const char
*typename)
return NULL;
}
+#ifdef CONFIG_QOM_CAST_STATS
+static void cast_stats_dump(void)
+{
+ qemu_timeval ts;
+ uint64_t delta;
+ int64_t udelta;
+
+ qemu_gettimeofday(&ts);
+
+ delta = ts.tv_sec - cast_stats_ts.tv_sec;
+ udelta = ts.tv_usec - cast_stats_ts.tv_usec;
+ if (udelta < 0) {
+ delta += 1;
+ udelta += 1000000;
+ }
+
+ delta *= 1000000;
+ delta += udelta;
+
+ printf("casts/sec: %f\n", (double)(cast_stats.total * 1000000) / delta);
+ printf("hit/sec: %f\n", (double)(cast_stats.hit * 1000000) / delta);
+ printf("miss/sec: %f\n", (double)(cast_stats.miss * 1000000) / delta);
+ printf("rebalance/sec: %f\n", (double)(cast_stats.rebalance * 1000000) /
delta);
+ printf("classes/sec: %f\n", (double)(cast_stats.class * 1000000) / delta);
+ printf("lookups/sec: %f\n", (double)(cast_stats.lookups * 1000000) /
delta);
+ printf("\n");
+
+ cast_stats.total = 1;
+ cast_stats.lookups = 0;
+ cast_stats.miss = 0;
+ cast_stats.hit = 0;
+ cast_stats.rebalance = 0;
+ cast_stats.class = 0;
+ cast_stats_ts = ts;
+}
+#endif
+
Object *object_dynamic_cast_assert(Object *obj, const char *typename,
const char *file, int line, const char
*func)
{
@@ -442,8 +500,17 @@ Object *object_dynamic_cast_assert(Object *obj, const char
*typename,
int i;
Object *inst;
+#ifdef CONFIG_QOM_CAST_STATS
+ if (cast_stats.total == 0) {
+ qemu_gettimeofday(&cast_stats_ts);
+ }
+#endif
+
for (i = 0; i < OBJECT_CLASS_CAST_CACHE; i++) {
if (obj->class->cast_cache[i] == typename) {
+#ifdef CONFIG_QOM_CAST_STATS
+ cast_stats.hit++;
+#endif
goto out;
}
}
@@ -463,9 +530,19 @@ Object *object_dynamic_cast_assert(Object *obj, const char
*typename,
obj->class->cast_cache[i - 1] = obj->class->cast_cache[i];
}
obj->class->cast_cache[i - 1] = typename;
+#ifdef CONFIG_QOM_CAST_STATS
+ cast_stats.miss++;
+#endif
}
out:
+#ifdef CONFIG_QOM_CAST_STATS
+ cast_stats.total++;
+
+ if (cast_stats.total == CAST_STATS_DUMP_INTERVAL) {
+ cast_stats_dump();
+ }
+#endif
#endif
return obj;
}
@@ -531,8 +608,15 @@ ObjectClass *object_class_dynamic_cast_assert(ObjectClass
*class,
#ifdef CONFIG_QOM_CAST_DEBUG
int i;
+#ifdef CONFIG_QOM_CAST_STATS
+ cast_stats.class++;
+#endif
+
for (i = 0; i < OBJECT_CLASS_CAST_CACHE; i++) {
if (class->cast_cache[i] == typename) {
+#ifdef CONFIG_QOM_CAST_STATS
+ cast_stats.hit++;
+#endif
ret = class;
goto out;
}
@@ -556,6 +640,10 @@ ObjectClass *object_class_dynamic_cast_assert(ObjectClass
*class,
class->cast_cache[i - 1] = class->cast_cache[i];
}
class->cast_cache[i - 1] = typename;
+
+#ifdef CONFIG_QOM_CAST_STATS
+ cast_stats.miss++;
+#endif
}
out:
#endif
--
1.8.0
