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Commit cf1f4574 authored by Ingo Molnar's avatar Ingo Molnar
Browse files

perf record, top: Implement --freq 



Support frequency-based profiling and make it the default.

(Also add a Hz printout in perf top.)

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent f250c030

Documentation/perf_counter/builtin-record.c

+9 −1
Original line number Diff line number Diff line
@@ -27,6 +27,7 @@ static int fd[MAX_NR_CPUS][MAX_COUNTERS]; 
static int			nr_cpus				= 0;

static unsigned int		page_size;

static unsigned int		mmap_pages			= 128;

static int			freq				= 0;

static int			output;

static const char		*output_name			= "perf.data";

static int			group				= 0;
@@ -347,6 +348,7 @@ static void create_counter(int counter, int cpu, pid_t pid) 
	attr.config		= event_id[counter];

	attr.sample_period	= event_count[counter];

	attr.sample_type	= PERF_SAMPLE_IP | PERF_SAMPLE_TID;

	attr.freq		= freq;

	attr.mmap		= track;

	attr.comm		= track;

	attr.inherit		= (cpu < 0) && inherit;
@@ -520,6 +522,8 @@ static const struct option options[] = { 
		    "output file name"),

	OPT_BOOLEAN('i', "inherit", &inherit,

		    "child tasks inherit counters"),

	OPT_INTEGER('F', "freq", &freq,

		    "profile at this frequency"),

	OPT_INTEGER('m', "mmap-pages", &mmap_pages,

		    "number of mmap data pages"),

	OPT_END()
@@ -540,6 +544,10 @@ int cmd_record(int argc, const char **argv, const char *prefix) 
		event_id[0] = 0;

	}



	if (freq) {

		default_interval = freq;

		freq = 1;

	}

	for (counter = 0; counter < nr_counters; counter++) {

		if (event_count[counter])

			continue;

Documentation/perf_counter/builtin-top.c

+9 −4
Original line number Diff line number Diff line
@@ -212,8 +212,13 @@ static void print_sym_table(void) 
		events_per_sec,

		100.0 - (100.0*((events_per_sec-kevents_per_sec)/events_per_sec)));



	if (nr_counters == 1)

	if (nr_counters == 1) {

		printf("%d", event_count[0]);

		if (freq)

			printf("Hz ");

		else

			printf(" ");

	}



	for (counter = 0; counter < nr_counters; counter++) {

		if (counter)