Commit 6c872901 authored by Jiri Olsa's avatar Jiri Olsa Committed by Arnaldo Carvalho de Melo
Browse files

perf cpu_map: Add cpu_map event synthesize function 



Introduce the perf_event__synthesize_cpu_map function to synthesize a
struct cpu_map.

Added generic interface:
  cpu_map_data__alloc
  cpu_map_data__synthesize

to make the cpu_map synthesizing usable for other events.

Signed-off-by: default avatarJiri Olsa <jolsa@kernel.org>
Tested-by: default avatarKan Liang <kan.liang@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1445784728-21732-9-git-send-email-jolsa@kernel.org


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 6640b6c2

tools/perf/tests/Build

+1 −0
Original line number Diff line number Diff line
@@ -34,6 +34,7 @@ perf-y += thread-map.o 
perf-y += llvm.o llvm-src-base.o llvm-src-kbuild.o llvm-src-prologue.o

perf-y += bpf.o

perf-y += topology.o

perf-y += cpumap.o



$(OUTPUT)tests/llvm-src-base.c: tests/bpf-script-example.c tests/Build

	$(call rule_mkdir)

tools/perf/tests/builtin-test.c

+4 −0
Original line number Diff line number Diff line
@@ -183,6 +183,10 @@ static struct test generic_tests[] = { 
		.desc = "Test thread map synthesize",

		.func = test__thread_map_synthesize,

	},

	{

		.desc = "Test cpu map synthesize",

		.func = test__cpu_map_synthesize,

	},

	{

		.func = NULL,

	},

tools/perf/tests/cpumap.c

0 → 100644
+71 −0
Original line number Diff line number Diff line 
#include "tests.h"

#include "cpumap.h"



static int process_event_mask(struct perf_tool *tool __maybe_unused,

			 union perf_event *event,

			 struct perf_sample *sample __maybe_unused,

			 struct machine *machine __maybe_unused)

{

	struct cpu_map_event *map = &event->cpu_map;

	struct cpu_map_mask *mask;

	struct cpu_map_data *data;

	int i;



	data = &map->data;



	TEST_ASSERT_VAL("wrong type", data->type == PERF_CPU_MAP__MASK);



	mask = (struct cpu_map_mask *)data->data;



	TEST_ASSERT_VAL("wrong nr",   mask->nr == 1);



	for (i = 0; i < 20; i++) {

		TEST_ASSERT_VAL("wrong cpu", test_bit(i, mask->mask));

	}



	return 0;

}



static int process_event_cpus(struct perf_tool *tool __maybe_unused,

			 union perf_event *event,

			 struct perf_sample *sample __maybe_unused,

			 struct machine *machine __maybe_unused)

{

	struct cpu_map_event *map = &event->cpu_map;

	struct cpu_map_entries *cpus;

	struct cpu_map_data *data;



	data = &map->data;



	TEST_ASSERT_VAL("wrong type", data->type == PERF_CPU_MAP__CPUS);



	cpus = (struct cpu_map_entries *)data->data;



	TEST_ASSERT_VAL("wrong nr",   cpus->nr == 2);

	TEST_ASSERT_VAL("wrong cpu",  cpus->cpu[0] == 1);

	TEST_ASSERT_VAL("wrong cpu",  cpus->cpu[1] == 256);

	return 0;

}





int test__cpu_map_synthesize(int subtest __maybe_unused)

{

	struct cpu_map *cpus;



	/* This one is better stores in mask. */

	cpus = cpu_map__new("0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19");



	TEST_ASSERT_VAL("failed to synthesize map",

		!perf_event__synthesize_cpu_map(NULL, cpus, process_event_mask, NULL));



	cpu_map__put(cpus);



	/* This one is better stores in cpu values. */

	cpus = cpu_map__new("1,256");



	TEST_ASSERT_VAL("failed to synthesize map",

		!perf_event__synthesize_cpu_map(NULL, cpus, process_event_cpus, NULL));



	cpu_map__put(cpus);

	return 0;

}

tools/perf/tests/tests.h

+1 −0
Original line number Diff line number Diff line
@@ -80,6 +80,7 @@ const char *test__bpf_subtest_get_desc(int subtest); 
int test__bpf_subtest_get_nr(void);

int test_session_topology(int subtest);

int test__thread_map_synthesize(int subtest);

int test__cpu_map_synthesize(int subtest);



#if defined(__arm__) || defined(__aarch64__)

#ifdef HAVE_DWARF_UNWIND_SUPPORT

tools/perf/util/event.c

+131 −0
Original line number Diff line number Diff line
@@ -737,6 +737,137 @@ int perf_event__synthesize_thread_map2(struct perf_tool *tool, 
	return err;

}



static void synthesize_cpus(struct cpu_map_entries *cpus,

			    struct cpu_map *map)

{

	int i;



	cpus->nr = map->nr;



	for (i = 0; i < map->nr; i++)

		cpus->cpu[i] = map->map[i];

}



static void synthesize_mask(struct cpu_map_mask *mask,

			    struct cpu_map *map, int max)

{

	int i;



	mask->nr = BITS_TO_LONGS(max);

	mask->long_size = sizeof(long);



	for (i = 0; i < map->nr; i++)

		set_bit(map->map[i], mask->mask);

}



static size_t cpus_size(struct cpu_map *map)

{

	return sizeof(struct cpu_map_entries) + map->nr * sizeof(u16);

}



static size_t mask_size(struct cpu_map *map, int *max)

{

	int i;



	*max = 0;



	for (i = 0; i < map->nr; i++) {

		/* bit possition of the cpu is + 1 */

		int bit = map->map[i] + 1;



		if (bit > *max)

			*max = bit;

	}



	return sizeof(struct cpu_map_mask) + BITS_TO_LONGS(*max) * sizeof(long);

}



void *cpu_map_data__alloc(struct cpu_map *map, size_t *size, u16 *type, int *max)

{

	size_t size_cpus, size_mask;

	bool is_dummy = cpu_map__empty(map);



	/*

	 * Both array and mask data have variable size based

	 * on the number of cpus and their actual values.

	 * The size of the 'struct cpu_map_data' is:

	 *

	 *   array = size of 'struct cpu_map_entries' +

	 *           number of cpus * sizeof(u64)

	 *

	 *   mask  = size of 'struct cpu_map_mask' +

	 *           maximum cpu bit converted to size of longs

	 *

	 * and finaly + the size of 'struct cpu_map_data'.

	 */

	size_cpus = cpus_size(map);

	size_mask = mask_size(map, max);



	if (is_dummy || (size_cpus < size_mask)) {

		*size += size_cpus;

		*type  = PERF_CPU_MAP__CPUS;

	} else {

		*size += size_mask;

		*type  = PERF_CPU_MAP__MASK;

	}



	*size += sizeof(struct cpu_map_data);

	return zalloc(*size);

}



void cpu_map_data__synthesize(struct cpu_map_data *data, struct cpu_map *map,

			      u16 type, int max)

{

	data->type = type;



	switch (type) {

	case PERF_CPU_MAP__CPUS:

		synthesize_cpus((struct cpu_map_entries *) data->data, map);

		break;

	case PERF_CPU_MAP__MASK:

		synthesize_mask((struct cpu_map_mask *) data->data, map, max);

	default:

		break;

	};

}



static struct cpu_map_event* cpu_map_event__new(struct cpu_map *map)

{

	size_t size = sizeof(struct cpu_map_event);

	struct cpu_map_event *event;

	int max;

	u16 type;



	event = cpu_map_data__alloc(map, &size, &type, &max);

	if (!event)

		return NULL;



	event->header.type = PERF_RECORD_CPU_MAP;

	event->header.size = size;

	event->data.type   = type;



	cpu_map_data__synthesize(&event->data, map, type, max);

	return event;

}



int perf_event__synthesize_cpu_map(struct perf_tool *tool,

				   struct cpu_map *map,

				   perf_event__handler_t process,

				   struct machine *machine)

{

	struct cpu_map_event *event;

	int err;



	event = cpu_map_event__new(map);

	if (!event)

		return -ENOMEM;



	err = process(tool, (union perf_event *) event, NULL, machine);



	free(event);

	return err;

}



size_t perf_event__fprintf_comm(union perf_event *event, FILE *fp)

{

	const char *s;

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