[PATCH v5 10/16] perf kvm: Add dimensions for KVM event statistics

Leo Yan
2023-03-15T14:53:24Z

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>
---
tools/perf/builtin-kvm.c | 232 ++++++++++++++++++++++++++++++++++++-
tools/perf/util/kvm-stat.h | 2 +
2 files changed, 230 insertions(+), 4 deletions(-)

diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
index fa91c8deb628..3f601ccb7aab 100644
--- a/tools/perf/builtin-kvm.c
+++ b/tools/perf/builtin-kvm.c
@@ -70,9 +70,9 @@ 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);

@@ -90,13 +90,237 @@ 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");
}

static const char *get_filename_for_perf_kvm(void)
diff --git a/tools/perf/util/kvm-stat.h b/tools/perf/util/kvm-stat.h
index 0cf704333c4c..fc30a72dfac1 100644
--- a/tools/perf/util/kvm-stat.h
+++ b/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);
--
2.34.1