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Commit 1676b8a0 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

perf-top: Show the percentage of successfull PEBS-fixups 



Use the PERF_RECORD_MISC_EXACT information to measure the success rate of
the PEBS fix-up.

Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: paulus@samba.org
Cc: eranian@google.com
Cc: robert.richter@amd.com
Cc: fweisbec@gmail.com
LKML-Reference: <20100304140100.694233760@chello.nl>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent ef21f683

tools/perf/builtin-top.c

+9 −3
Original line number Diff line number Diff line
@@ -410,6 +410,7 @@ static double sym_weight(const struct sym_entry *sym) 


static long			samples;

static long			userspace_samples;

static long			exact_samples;

static const char		CONSOLE_CLEAR[] = "";



static void __list_insert_active_sym(struct sym_entry *syme)
@@ -450,6 +451,7 @@ static void print_sym_table(void) 
	int counter, snap = !display_weighted ? sym_counter : 0;

	float samples_per_sec = samples/delay_secs;

	float ksamples_per_sec = (samples-userspace_samples)/delay_secs;

	float esamples_percent = (100.0*exact_samples)/samples;

	float sum_ksamples = 0.0;

	struct sym_entry *syme, *n;

	struct rb_root tmp = RB_ROOT;
@@ -457,7 +459,7 @@ static void print_sym_table(void) 
	int sym_width = 0, dso_width = 0, max_dso_width;

	const int win_width = winsize.ws_col - 1;



	samples = userspace_samples = 0;

	samples = userspace_samples = exact_samples = 0;



	/* Sort the active symbols */

	pthread_mutex_lock(&active_symbols_lock);
@@ -488,9 +490,10 @@ static void print_sym_table(void) 
	puts(CONSOLE_CLEAR);



	printf("%-*.*s\n", win_width, win_width, graph_dotted_line);

	printf( "   PerfTop:%8.0f irqs/sec  kernel:%4.1f%% [",

	printf( "   PerfTop:%8.0f irqs/sec  kernel:%4.1f%%  exact: %4.1f%% [",

		samples_per_sec,

		100.0 - (100.0*((samples_per_sec-ksamples_per_sec)/samples_per_sec)));

		100.0 - (100.0*((samples_per_sec-ksamples_per_sec)/samples_per_sec)),

		esamples_percent);



	if (nr_counters == 1 || !display_weighted) {

		printf("%Ld", (u64)attrs[0].sample_period);
@@ -954,6 +957,9 @@ static void event__process_sample(const event_t *self, 
		return;

	}



	if (self->header.misc & PERF_RECORD_MISC_EXACT)

		exact_samples++;



	if (event__preprocess_sample(self, session, &al, symbol_filter) < 0 ||

	    al.filtered)

		return;