perf kvm: Polish sorting key

Since histograms supports sorting, the tool doesn't need to maintain the
mapping between the sorting keys and the corresponding comparison
callbacks, therefore, this patch removes structure kvm_event_key.

But we still need to validate the sorting key, this patch uses an array
for sorting keys and renames function select_key() to is_valid_key()
to validate the sorting key passed by user.

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>

1 files changed, 0 insertions, 8 deletions

diff --git a/tools/perf/util/kvm-stat.h b/tools/perf/util/kvm-stat.h
index 3f0cbecb862c..35d03894fac3 100644
--- a/tools/perf/util/kvm-stat.h
+++ b/tools/perf/util/kvm-stat.h
@@ -49,13 +49,6 @@ struct kvm_event {
 	struct hist_entry he;
 };
 
-typedef int64_t (*key_cmp_fun)(struct kvm_event*, struct kvm_event*, int);
-
-struct kvm_event_key {
-	const char *name;
-	key_cmp_fun key;
-};
-
 struct child_event_ops {
 	void (*get_key)(struct evsel *evsel,
 			struct perf_sample *sample,
@@ -98,7 +91,6 @@ struct perf_kvm_stat {
 	const char *exit_reasons_isa;
 
 	struct kvm_events_ops *events_ops;
-	key_cmp_fun compare;
 
 	u64 total_time;
 	u64 total_count;