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