perf kvm: Simplify exit reasons tables definitions
The perf_kvm_stat struct keeps the size of a table of exit reasons in
the field 'exit_reasons_size'.
The field is initialized and then used by get_exit_reason() for serial
access to the table, so that the calling function does not actually need
to know table size.
Usage of tables with 'end of sequence' marker simplifies the
get_exit_reason() function.
Also the patch introduces a define_exit_reasons_table, which makes it
easier to define new tables.
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>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
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/1404395992-17095-3-git-send-email-yarygin@linux.vnet.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
index 214ec0e..75f3544 100644
--- a/tools/perf/builtin-kvm.c
+++ b/tools/perf/builtin-kvm.c
@@ -99,7 +99,6 @@
int trace_vcpu;
struct exit_reasons_table *exit_reasons;
- int exit_reasons_size;
const char *exit_reasons_isa;
struct kvm_events_ops *events_ops;
@@ -158,20 +157,19 @@
return kvm_entry_event(evsel);
}
-static struct exit_reasons_table vmx_exit_reasons[] = {
- VMX_EXIT_REASONS
-};
+#define define_exit_reasons_table(name, symbols) \
+ static struct exit_reasons_table name[] = { \
+ symbols, { -1, NULL } \
+ }
-static struct exit_reasons_table svm_exit_reasons[] = {
- SVM_EXIT_REASONS
-};
+define_exit_reasons_table(vmx_exit_reasons, VMX_EXIT_REASONS);
+define_exit_reasons_table(svm_exit_reasons, SVM_EXIT_REASONS);
-static const char *get_exit_reason(struct perf_kvm_stat *kvm, u64 exit_code)
+static const char *get_exit_reason(struct perf_kvm_stat *kvm,
+ struct exit_reasons_table *tbl,
+ u64 exit_code)
{
- int i = kvm->exit_reasons_size;
- struct exit_reasons_table *tbl = kvm->exit_reasons;
-
- while (i--) {
+ while (tbl->reason != NULL) {
if (tbl->exit_code == exit_code)
return tbl->reason;
tbl++;
@@ -186,7 +184,8 @@
struct event_key *key,
char decode[20])
{
- const char *exit_reason = get_exit_reason(kvm, key->key);
+ const char *exit_reason = get_exit_reason(kvm, kvm->exit_reasons,
+ key->key);
scnprintf(decode, 20, "%s", exit_reason);
}
@@ -862,7 +861,6 @@
if (isa == 1) {
kvm->exit_reasons = vmx_exit_reasons;
- kvm->exit_reasons_size = ARRAY_SIZE(vmx_exit_reasons);
kvm->exit_reasons_isa = "VMX";
}
@@ -1586,7 +1584,6 @@
.sort_key = "sample",
.exit_reasons = svm_exit_reasons,
- .exit_reasons_size = ARRAY_SIZE(svm_exit_reasons),
.exit_reasons_isa = "SVM",
};