perf kvm: Add dimensions for KVM event statistics

To support KVM event statistics, this patch firstly registers histograms
columns and sorting fields; every column or field has its own format
structure, the format structure is dereferenced to access the dimension,
finally the dimension provides the comparison callback for sorting
result.

Signed-off-by: Leo Yan <leo.yan@linaro.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20230315145112.186603-2-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-kvm.c

@@ -71,9 +71,9 @@ static int64_t cmp_event_ ## func(struct kvm_event *one,		\
 	       get_event_ ##func(two, vcpu);				\
 }
 
-GET_EVENT_KEY(time, time);
-GET_EVENT_KEY(max, stats.max);
-GET_EVENT_KEY(min, stats.min);
+COMPARE_EVENT_KEY(time, time);
+COMPARE_EVENT_KEY(max, stats.max);
+COMPARE_EVENT_KEY(min, stats.min);
 COMPARE_EVENT_KEY(count, stats.n);
 COMPARE_EVENT_KEY(mean, stats.mean);
 
@@ -91,13 +91,237 @@ struct kvm_hists {
 	struct perf_hpp_list	list;
 };
 
+struct kvm_dimension {
+	const char *name;
+	int64_t (*cmp)(struct perf_hpp_fmt *fmt, struct hist_entry *left,
+		       struct hist_entry *right);
+};
+
+struct kvm_fmt {
+	struct perf_hpp_fmt	fmt;
+	struct kvm_dimension	*dim;
+};
+
 static struct kvm_hists kvm_hists;
 
+static int64_t ev_name_cmp(struct perf_hpp_fmt *fmt __maybe_unused,
+			   struct hist_entry *left,
+			   struct hist_entry *right)
+{
+	/* Return opposite number for sorting in alphabetical order */
+	return -strcmp(left->kvm_info->name, right->kvm_info->name);
+}
+
+static struct kvm_dimension dim_event = {
+	.name		= "ev_name",
+	.cmp		= ev_name_cmp,
+};
+
+#define EV_METRIC_CMP(metric)						\
+static int64_t ev_cmp_##metric(struct perf_hpp_fmt *fmt __maybe_unused,	\
+			       struct hist_entry *left,			\
+			       struct hist_entry *right)		\
+{									\
+	struct kvm_event *event_left;					\
+	struct kvm_event *event_right;					\
+	struct perf_kvm_stat *perf_kvm;					\
+									\
+	event_left  = container_of(left, struct kvm_event, he);		\
+	event_right = container_of(right, struct kvm_event, he);	\
+									\
+	perf_kvm = event_left->perf_kvm;				\
+	return cmp_event_##metric(event_left, event_right,		\
+				  perf_kvm->trace_vcpu);		\
+}
+
+EV_METRIC_CMP(time)
+EV_METRIC_CMP(count)
+EV_METRIC_CMP(max)
+EV_METRIC_CMP(min)
+EV_METRIC_CMP(mean)
+
+static struct kvm_dimension dim_time = {
+	.name		= "time",
+	.cmp		= ev_cmp_time,
+};
+
+static struct kvm_dimension dim_count = {
+	.name		= "sample",
+	.cmp		= ev_cmp_count,
+};
+
+static struct kvm_dimension dim_max_time = {
+	.name		= "max_t",
+	.cmp		= ev_cmp_max,
+};
+
+static struct kvm_dimension dim_min_time = {
+	.name		= "min_t",
+	.cmp		= ev_cmp_min,
+};
+
+static struct kvm_dimension dim_mean_time = {
+	.name		= "mean_t",
+	.cmp		= ev_cmp_mean,
+};
+
+static struct kvm_dimension *dimensions[] = {
+	&dim_event,
+	&dim_time,
+	&dim_count,
+	&dim_max_time,
+	&dim_min_time,
+	&dim_mean_time,
+	NULL,
+};
+
+static bool fmt_equal(struct perf_hpp_fmt *a, struct perf_hpp_fmt *b)
+{
+	struct kvm_fmt *kvm_fmt_a = container_of(a, struct kvm_fmt, fmt);
+	struct kvm_fmt *kvm_fmt_b = container_of(b, struct kvm_fmt, fmt);
+
+	return kvm_fmt_a->dim == kvm_fmt_b->dim;
+}
+
+static void fmt_free(struct perf_hpp_fmt *fmt)
+{
+	struct kvm_fmt *kvm_fmt;
+
+	kvm_fmt = container_of(fmt, struct kvm_fmt, fmt);
+	free(kvm_fmt);
+}
+
+static struct kvm_dimension *get_dimension(const char *name)
+{
+	unsigned int i;
+
+	for (i = 0; dimensions[i] != NULL; i++) {
+		if (!strcmp(dimensions[i]->name, name))
+			return dimensions[i];
+	}
+
+	return NULL;
+}
+
+static struct kvm_fmt *get_format(const char *name)
+{
+	struct kvm_dimension *dim = get_dimension(name);
+	struct kvm_fmt *kvm_fmt;
+	struct perf_hpp_fmt *fmt;
+
+	if (!dim)
+		return NULL;
+
+	kvm_fmt = zalloc(sizeof(*kvm_fmt));
+	if (!kvm_fmt)
+		return NULL;
+
+	kvm_fmt->dim = dim;
+
+	fmt = &kvm_fmt->fmt;
+	INIT_LIST_HEAD(&fmt->list);
+	INIT_LIST_HEAD(&fmt->sort_list);
+	fmt->cmp	= dim->cmp;
+	fmt->sort	= dim->cmp;
+	fmt->color	= NULL;
+	fmt->entry	= NULL;
+	fmt->header	= NULL;
+	fmt->width	= NULL;
+	fmt->collapse	= dim->cmp;
+	fmt->equal	= fmt_equal;
+	fmt->free	= fmt_free;
+
+	return kvm_fmt;
+}
+
+static int kvm_hists__init_output(struct perf_hpp_list *hpp_list, char *name)
+{
+	struct kvm_fmt *kvm_fmt = get_format(name);
+
+	if (!kvm_fmt) {
+		pr_warning("Fail to find format for output field %s.\n", name);
+		return -EINVAL;
+	}
+
+	perf_hpp_list__column_register(hpp_list, &kvm_fmt->fmt);
+	return 0;
+}
+
+static int kvm_hists__init_sort(struct perf_hpp_list *hpp_list, char *name)
+{
+	struct kvm_fmt *kvm_fmt = get_format(name);
+
+	if (!kvm_fmt) {
+		pr_warning("Fail to find format for sorting %s.\n", name);
+		return -EINVAL;
+	}
+
+	perf_hpp_list__register_sort_field(hpp_list, &kvm_fmt->fmt);
+	return 0;
+}
+
+static int kvm_hpp_list__init(char *list,
+			      struct perf_hpp_list *hpp_list,
+			      int (*fn)(struct perf_hpp_list *hpp_list,
+					char *name))
+{
+	char *tmp, *tok;
+	int ret;
+
+	if (!list || !fn)
+		return 0;
+
+	for (tok = strtok_r(list, ", ", &tmp); tok;
+	     tok = strtok_r(NULL, ", ", &tmp)) {
+		ret = fn(hpp_list, tok);
+		if (!ret)
+			continue;
+
+		/* Handle errors */
+		if (ret == -EINVAL)
+			pr_err("Invalid field key: '%s'", tok);
+		else if (ret == -ESRCH)
+			pr_err("Unknown field key: '%s'", tok);
+		else
+			pr_err("Fail to initialize for field key: '%s'", tok);
+
+		break;
+	}
+
+	return ret;
+}
+
+static int kvm_hpp_list__parse(struct perf_hpp_list *hpp_list,
+			       const char *output_, const char *sort_)
+{
+	char *output = output_ ? strdup(output_) : NULL;
+	char *sort = sort_ ? strdup(sort_) : NULL;
+	int ret;
+
+	ret = kvm_hpp_list__init(output, hpp_list, kvm_hists__init_output);
+	if (ret)
+		goto out;
+
+	ret = kvm_hpp_list__init(sort, hpp_list, kvm_hists__init_sort);
+	if (ret)
+		goto out;
+
+	/* Copy sort keys to output fields */
+	perf_hpp__setup_output_field(hpp_list);
+
+	/* and then copy output fields to sort keys */
+	perf_hpp__append_sort_keys(hpp_list);
+out:
+	free(output);
+	free(sort);
+	return ret;
+}
+
 static int kvm_hists__init(void)
 {
 	__hists__init(&kvm_hists.hists, &kvm_hists.list);
 	perf_hpp_list__init(&kvm_hists.list);
-	return 0;
+	return kvm_hpp_list__parse(&kvm_hists.list, NULL, "ev_name");
 }
 #endif // defined(HAVE_KVM_STAT_SUPPORT) && defined(HAVE_LIBTRACEEVENT)
 

tools/perf/util/kvm-stat.h

@@ -46,6 +46,8 @@ struct kvm_event {
 	#define DEFAULT_VCPU_NUM 8
 	int max_vcpu;
 	struct kvm_event_stats *vcpu;
+
+	struct hist_entry he;
 };
 
 typedef int64_t (*key_cmp_fun)(struct kvm_event*, struct kvm_event*, int);