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Commit df74c13b authored by Alexander Yarygin's avatar Alexander Yarygin Committed by Arnaldo Carvalho de Melo
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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: default avatarCornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: default avatarDavid Ahern <dsahern@gmail.com>
Signed-off-by: default avatarAlexander Yarygin <yarygin@linux.vnet.ibm.com>
Acked-by: default avatarChristian 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: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent da50ad69

tools/perf/builtin-kvm.c

+12 −15
Original line number Diff line number Diff line
@@ -99,7 +99,6 @@ struct perf_kvm_stat { 
	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 @@ static bool exit_event_end(struct perf_evsel *evsel, 
	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 @@ static void exit_event_decode_key(struct perf_kvm_stat *kvm, 
				  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 @@ static int cpu_isa_config(struct perf_kvm_stat *kvm) 


	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 @@ static int kvm_cmd_stat(const char *file_name, int argc, const char **argv) 
		.sort_key	= "sample",



		.exit_reasons = svm_exit_reasons,

		.exit_reasons_size = ARRAY_SIZE(svm_exit_reasons),

		.exit_reasons_isa = "SVM",

	};