perf kvm: Add skip_event() for --duration option

Current code skips output of the x86 specific HLT event in order to
avoid flooding the output with enabled --duration option. The events to
be skipped should be architecture dependent, though.

Let's add an architecture specific array of events to be skipped and
introduce a skip_event() function checking against that array.

Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Alexander Yarygin <yarygin@linux.vnet.ibm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1404397747-20939-4-git-send-email-yarygin@linux.vnet.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/arch/x86/util/kvm-stat.c

@@ -136,6 +136,11 @@ struct kvm_reg_events_ops kvm_reg_events_ops[] = {
 	{ NULL, NULL },
 };
 
+const char * const kvm_skip_events[] = {
+	"HLT",
+	NULL,
+};
+
 int cpu_isa_init(struct perf_kvm_stat *kvm, const char *cpuid)
 {
 	if (strstr(cpuid, "Intel")) {

tools/perf/builtin-kvm.c

@@ -261,6 +261,17 @@ static bool update_kvm_event(struct kvm_event *event, int vcpu_id,
 	return true;
 }
 
+static bool skip_event(const char *event)
+{
+	const char * const *skip_events;
+
+	for (skip_events = kvm_skip_events; *skip_events; skip_events++)
+		if (!strcmp(event, *skip_events))
+			return true;
+
+	return false;
+}
+
 static bool handle_end_event(struct perf_kvm_stat *kvm,
 			     struct vcpu_event_record *vcpu_record,
 			     struct event_key *key,
@@ -312,7 +323,7 @@ static bool handle_end_event(struct perf_kvm_stat *kvm,
 		char decode[DECODE_STR_LEN];
 
 		kvm->events_ops->decode_key(kvm, &event->key, decode);
-		if (strcmp(decode, "HLT")) {
+		if (!skip_event(decode)) {
 			pr_info("%" PRIu64 " VM %d, vcpu %d: %s event took %" PRIu64 "usec\n",
 				 sample->time, sample->pid, vcpu_record->vcpu_id,
 				 decode, time_diff/1000);

tools/perf/util/kvm-stat.h

@@ -126,5 +126,6 @@ int cpu_isa_init(struct perf_kvm_stat *kvm, const char *cpuid);
 
 extern const char * const kvm_events_tp[];
 extern struct kvm_reg_events_ops kvm_reg_events_ops[];
+extern const char * const kvm_skip_events[];
 
 #endif /* __PERF_KVM_STAT_H */