linux/tools/perf/util/cpumap.c
Jiri Olsa 86895b480a perf stat: Add --per-node agregation support
Adding new --per-node option to aggregate counts per NUMA
nodes for system-wide mode measurements.

You can specify --per-node in live mode:

  # perf stat  -a -I 1000 -e cycles --per-node
  #           time node   cpus             counts unit events
       1.000542550 N0       20          6,202,097      cycles
       1.000542550 N1       20            639,559      cycles
       2.002040063 N0       20          7,412,495      cycles
       2.002040063 N1       20          2,185,577      cycles
       3.003451699 N0       20          6,508,917      cycles
       3.003451699 N1       20            765,607      cycles
  ...

Or in the record/report stat session:

  # perf stat record -a -I 1000 -e cycles
  #           time             counts unit events
       1.000536937         10,008,468      cycles
       2.002090152          9,578,539      cycles
       3.003625233          7,647,869      cycles
       4.005135036          7,032,086      cycles
  ^C     4.340902364          3,923,893      cycles

  # perf stat report --per-node
  #           time node   cpus             counts unit events
       1.000536937 N0       20          9,355,086      cycles
       1.000536937 N1       20            653,382      cycles
       2.002090152 N0       20          7,712,838      cycles
       2.002090152 N1       20          1,865,701      cycles
       3.003625233 N0       20          6,604,441      cycles
       3.003625233 N1       20          1,043,428      cycles
       4.005135036 N0       20          6,350,522      cycles
       4.005135036 N1       20            681,564      cycles
       4.340902364 N0       20          3,403,188      cycles
       4.340902364 N1       20            520,705      cycles

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexey Budankov <alexey.budankov@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Joe Mario <jmario@redhat.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20190904073415.723-4-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2019-11-06 15:49:39 -03:00

589 lines
12 KiB
C

// SPDX-License-Identifier: GPL-2.0
#include <api/fs/fs.h>
#include "cpumap.h"
#include "debug.h"
#include "event.h"
#include <assert.h>
#include <dirent.h>
#include <stdio.h>
#include <stdlib.h>
#include <linux/bitmap.h>
#include "asm/bug.h"
#include <linux/ctype.h>
#include <linux/zalloc.h>
static int max_cpu_num;
static int max_present_cpu_num;
static int max_node_num;
static int *cpunode_map;
static struct perf_cpu_map *cpu_map__from_entries(struct cpu_map_entries *cpus)
{
struct perf_cpu_map *map;
map = perf_cpu_map__empty_new(cpus->nr);
if (map) {
unsigned i;
for (i = 0; i < cpus->nr; i++) {
/*
* Special treatment for -1, which is not real cpu number,
* and we need to use (int) -1 to initialize map[i],
* otherwise it would become 65535.
*/
if (cpus->cpu[i] == (u16) -1)
map->map[i] = -1;
else
map->map[i] = (int) cpus->cpu[i];
}
}
return map;
}
static struct perf_cpu_map *cpu_map__from_mask(struct perf_record_record_cpu_map *mask)
{
struct perf_cpu_map *map;
int nr, nbits = mask->nr * mask->long_size * BITS_PER_BYTE;
nr = bitmap_weight(mask->mask, nbits);
map = perf_cpu_map__empty_new(nr);
if (map) {
int cpu, i = 0;
for_each_set_bit(cpu, mask->mask, nbits)
map->map[i++] = cpu;
}
return map;
}
struct perf_cpu_map *cpu_map__new_data(struct perf_record_cpu_map_data *data)
{
if (data->type == PERF_CPU_MAP__CPUS)
return cpu_map__from_entries((struct cpu_map_entries *)data->data);
else
return cpu_map__from_mask((struct perf_record_record_cpu_map *)data->data);
}
size_t cpu_map__fprintf(struct perf_cpu_map *map, FILE *fp)
{
#define BUFSIZE 1024
char buf[BUFSIZE];
cpu_map__snprint(map, buf, sizeof(buf));
return fprintf(fp, "%s\n", buf);
#undef BUFSIZE
}
struct perf_cpu_map *perf_cpu_map__empty_new(int nr)
{
struct perf_cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int) * nr);
if (cpus != NULL) {
int i;
cpus->nr = nr;
for (i = 0; i < nr; i++)
cpus->map[i] = -1;
refcount_set(&cpus->refcnt, 1);
}
return cpus;
}
static int cpu__get_topology_int(int cpu, const char *name, int *value)
{
char path[PATH_MAX];
snprintf(path, PATH_MAX,
"devices/system/cpu/cpu%d/topology/%s", cpu, name);
return sysfs__read_int(path, value);
}
int cpu_map__get_socket_id(int cpu)
{
int value, ret = cpu__get_topology_int(cpu, "physical_package_id", &value);
return ret ?: value;
}
int cpu_map__get_socket(struct perf_cpu_map *map, int idx, void *data __maybe_unused)
{
int cpu;
if (idx > map->nr)
return -1;
cpu = map->map[idx];
return cpu_map__get_socket_id(cpu);
}
static int cmp_ids(const void *a, const void *b)
{
return *(int *)a - *(int *)b;
}
int cpu_map__build_map(struct perf_cpu_map *cpus, struct perf_cpu_map **res,
int (*f)(struct perf_cpu_map *map, int cpu, void *data),
void *data)
{
struct perf_cpu_map *c;
int nr = cpus->nr;
int cpu, s1, s2;
/* allocate as much as possible */
c = calloc(1, sizeof(*c) + nr * sizeof(int));
if (!c)
return -1;
for (cpu = 0; cpu < nr; cpu++) {
s1 = f(cpus, cpu, data);
for (s2 = 0; s2 < c->nr; s2++) {
if (s1 == c->map[s2])
break;
}
if (s2 == c->nr) {
c->map[c->nr] = s1;
c->nr++;
}
}
/* ensure we process id in increasing order */
qsort(c->map, c->nr, sizeof(int), cmp_ids);
refcount_set(&c->refcnt, 1);
*res = c;
return 0;
}
int cpu_map__get_die_id(int cpu)
{
int value, ret = cpu__get_topology_int(cpu, "die_id", &value);
return ret ?: value;
}
int cpu_map__get_die(struct perf_cpu_map *map, int idx, void *data)
{
int cpu, die_id, s;
if (idx > map->nr)
return -1;
cpu = map->map[idx];
die_id = cpu_map__get_die_id(cpu);
/* There is no die_id on legacy system. */
if (die_id == -1)
die_id = 0;
s = cpu_map__get_socket(map, idx, data);
if (s == -1)
return -1;
/*
* Encode socket in bit range 15:8
* die_id is relative to socket, and
* we need a global id. So we combine
* socket + die id
*/
if (WARN_ONCE(die_id >> 8, "The die id number is too big.\n"))
return -1;
if (WARN_ONCE(s >> 8, "The socket id number is too big.\n"))
return -1;
return (s << 8) | (die_id & 0xff);
}
int cpu_map__get_core_id(int cpu)
{
int value, ret = cpu__get_topology_int(cpu, "core_id", &value);
return ret ?: value;
}
int cpu_map__get_node_id(int cpu)
{
return cpu__get_node(cpu);
}
int cpu_map__get_core(struct perf_cpu_map *map, int idx, void *data)
{
int cpu, s_die;
if (idx > map->nr)
return -1;
cpu = map->map[idx];
cpu = cpu_map__get_core_id(cpu);
/* s_die is the combination of socket + die id */
s_die = cpu_map__get_die(map, idx, data);
if (s_die == -1)
return -1;
/*
* encode socket in bit range 31:24
* encode die id in bit range 23:16
* core_id is relative to socket and die,
* we need a global id. So we combine
* socket + die id + core id
*/
if (WARN_ONCE(cpu >> 16, "The core id number is too big.\n"))
return -1;
return (s_die << 16) | (cpu & 0xffff);
}
int cpu_map__get_node(struct perf_cpu_map *map, int idx, void *data __maybe_unused)
{
if (idx < 0 || idx >= map->nr)
return -1;
return cpu_map__get_node_id(map->map[idx]);
}
int cpu_map__build_socket_map(struct perf_cpu_map *cpus, struct perf_cpu_map **sockp)
{
return cpu_map__build_map(cpus, sockp, cpu_map__get_socket, NULL);
}
int cpu_map__build_die_map(struct perf_cpu_map *cpus, struct perf_cpu_map **diep)
{
return cpu_map__build_map(cpus, diep, cpu_map__get_die, NULL);
}
int cpu_map__build_core_map(struct perf_cpu_map *cpus, struct perf_cpu_map **corep)
{
return cpu_map__build_map(cpus, corep, cpu_map__get_core, NULL);
}
int cpu_map__build_node_map(struct perf_cpu_map *cpus, struct perf_cpu_map **numap)
{
return cpu_map__build_map(cpus, numap, cpu_map__get_node, NULL);
}
/* setup simple routines to easily access node numbers given a cpu number */
static int get_max_num(char *path, int *max)
{
size_t num;
char *buf;
int err = 0;
if (filename__read_str(path, &buf, &num))
return -1;
buf[num] = '\0';
/* start on the right, to find highest node num */
while (--num) {
if ((buf[num] == ',') || (buf[num] == '-')) {
num++;
break;
}
}
if (sscanf(&buf[num], "%d", max) < 1) {
err = -1;
goto out;
}
/* convert from 0-based to 1-based */
(*max)++;
out:
free(buf);
return err;
}
/* Determine highest possible cpu in the system for sparse allocation */
static void set_max_cpu_num(void)
{
const char *mnt;
char path[PATH_MAX];
int ret = -1;
/* set up default */
max_cpu_num = 4096;
max_present_cpu_num = 4096;
mnt = sysfs__mountpoint();
if (!mnt)
goto out;
/* get the highest possible cpu number for a sparse allocation */
ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/possible", mnt);
if (ret == PATH_MAX) {
pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
goto out;
}
ret = get_max_num(path, &max_cpu_num);
if (ret)
goto out;
/* get the highest present cpu number for a sparse allocation */
ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/present", mnt);
if (ret == PATH_MAX) {
pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
goto out;
}
ret = get_max_num(path, &max_present_cpu_num);
out:
if (ret)
pr_err("Failed to read max cpus, using default of %d\n", max_cpu_num);
}
/* Determine highest possible node in the system for sparse allocation */
static void set_max_node_num(void)
{
const char *mnt;
char path[PATH_MAX];
int ret = -1;
/* set up default */
max_node_num = 8;
mnt = sysfs__mountpoint();
if (!mnt)
goto out;
/* get the highest possible cpu number for a sparse allocation */
ret = snprintf(path, PATH_MAX, "%s/devices/system/node/possible", mnt);
if (ret == PATH_MAX) {
pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
goto out;
}
ret = get_max_num(path, &max_node_num);
out:
if (ret)
pr_err("Failed to read max nodes, using default of %d\n", max_node_num);
}
int cpu__max_node(void)
{
if (unlikely(!max_node_num))
set_max_node_num();
return max_node_num;
}
int cpu__max_cpu(void)
{
if (unlikely(!max_cpu_num))
set_max_cpu_num();
return max_cpu_num;
}
int cpu__max_present_cpu(void)
{
if (unlikely(!max_present_cpu_num))
set_max_cpu_num();
return max_present_cpu_num;
}
int cpu__get_node(int cpu)
{
if (unlikely(cpunode_map == NULL)) {
pr_debug("cpu_map not initialized\n");
return -1;
}
return cpunode_map[cpu];
}
static int init_cpunode_map(void)
{
int i;
set_max_cpu_num();
set_max_node_num();
cpunode_map = calloc(max_cpu_num, sizeof(int));
if (!cpunode_map) {
pr_err("%s: calloc failed\n", __func__);
return -1;
}
for (i = 0; i < max_cpu_num; i++)
cpunode_map[i] = -1;
return 0;
}
int cpu__setup_cpunode_map(void)
{
struct dirent *dent1, *dent2;
DIR *dir1, *dir2;
unsigned int cpu, mem;
char buf[PATH_MAX];
char path[PATH_MAX];
const char *mnt;
int n;
/* initialize globals */
if (init_cpunode_map())
return -1;
mnt = sysfs__mountpoint();
if (!mnt)
return 0;
n = snprintf(path, PATH_MAX, "%s/devices/system/node", mnt);
if (n == PATH_MAX) {
pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
return -1;
}
dir1 = opendir(path);
if (!dir1)
return 0;
/* walk tree and setup map */
while ((dent1 = readdir(dir1)) != NULL) {
if (dent1->d_type != DT_DIR || sscanf(dent1->d_name, "node%u", &mem) < 1)
continue;
n = snprintf(buf, PATH_MAX, "%s/%s", path, dent1->d_name);
if (n == PATH_MAX) {
pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
continue;
}
dir2 = opendir(buf);
if (!dir2)
continue;
while ((dent2 = readdir(dir2)) != NULL) {
if (dent2->d_type != DT_LNK || sscanf(dent2->d_name, "cpu%u", &cpu) < 1)
continue;
cpunode_map[cpu] = mem;
}
closedir(dir2);
}
closedir(dir1);
return 0;
}
bool cpu_map__has(struct perf_cpu_map *cpus, int cpu)
{
return perf_cpu_map__idx(cpus, cpu) != -1;
}
int cpu_map__cpu(struct perf_cpu_map *cpus, int idx)
{
return cpus->map[idx];
}
size_t cpu_map__snprint(struct perf_cpu_map *map, char *buf, size_t size)
{
int i, cpu, start = -1;
bool first = true;
size_t ret = 0;
#define COMMA first ? "" : ","
for (i = 0; i < map->nr + 1; i++) {
bool last = i == map->nr;
cpu = last ? INT_MAX : map->map[i];
if (start == -1) {
start = i;
if (last) {
ret += snprintf(buf + ret, size - ret,
"%s%d", COMMA,
map->map[i]);
}
} else if (((i - start) != (cpu - map->map[start])) || last) {
int end = i - 1;
if (start == end) {
ret += snprintf(buf + ret, size - ret,
"%s%d", COMMA,
map->map[start]);
} else {
ret += snprintf(buf + ret, size - ret,
"%s%d-%d", COMMA,
map->map[start], map->map[end]);
}
first = false;
start = i;
}
}
#undef COMMA
pr_debug2("cpumask list: %s\n", buf);
return ret;
}
static char hex_char(unsigned char val)
{
if (val < 10)
return val + '0';
if (val < 16)
return val - 10 + 'a';
return '?';
}
size_t cpu_map__snprint_mask(struct perf_cpu_map *map, char *buf, size_t size)
{
int i, cpu;
char *ptr = buf;
unsigned char *bitmap;
int last_cpu = cpu_map__cpu(map, map->nr - 1);
if (buf == NULL)
return 0;
bitmap = zalloc(last_cpu / 8 + 1);
if (bitmap == NULL) {
buf[0] = '\0';
return 0;
}
for (i = 0; i < map->nr; i++) {
cpu = cpu_map__cpu(map, i);
bitmap[cpu / 8] |= 1 << (cpu % 8);
}
for (cpu = last_cpu / 4 * 4; cpu >= 0; cpu -= 4) {
unsigned char bits = bitmap[cpu / 8];
if (cpu % 8)
bits >>= 4;
else
bits &= 0xf;
*ptr++ = hex_char(bits);
if ((cpu % 32) == 0 && cpu > 0)
*ptr++ = ',';
}
*ptr = '\0';
free(bitmap);
buf[size - 1] = '\0';
return ptr - buf;
}
const struct perf_cpu_map *cpu_map__online(void) /* thread unsafe */
{
static const struct perf_cpu_map *online = NULL;
if (!online)
online = perf_cpu_map__new(NULL); /* from /sys/devices/system/cpu/online */
return online;
}