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![Arnaldo Carvalho de Melo](/assets/img/avatar_default.png)
For helping with debugging. Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-m06n4rp7pwr6dlzwoq89cl69@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
195 lines
3.7 KiB
C
195 lines
3.7 KiB
C
#include "util.h"
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#include "../perf.h"
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#include "cpumap.h"
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#include <assert.h>
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#include <stdio.h>
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static struct cpu_map *cpu_map__default_new(void)
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{
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struct cpu_map *cpus;
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int nr_cpus;
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nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
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if (nr_cpus < 0)
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return NULL;
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cpus = malloc(sizeof(*cpus) + nr_cpus * sizeof(int));
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if (cpus != NULL) {
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int i;
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for (i = 0; i < nr_cpus; ++i)
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cpus->map[i] = i;
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cpus->nr = nr_cpus;
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}
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return cpus;
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}
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static struct cpu_map *cpu_map__trim_new(int nr_cpus, int *tmp_cpus)
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{
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size_t payload_size = nr_cpus * sizeof(int);
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struct cpu_map *cpus = malloc(sizeof(*cpus) + payload_size);
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if (cpus != NULL) {
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cpus->nr = nr_cpus;
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memcpy(cpus->map, tmp_cpus, payload_size);
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}
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return cpus;
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}
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static struct cpu_map *cpu_map__read_all_cpu_map(void)
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{
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struct cpu_map *cpus = NULL;
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FILE *onlnf;
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int nr_cpus = 0;
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int *tmp_cpus = NULL, *tmp;
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int max_entries = 0;
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int n, cpu, prev;
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char sep;
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onlnf = fopen("/sys/devices/system/cpu/online", "r");
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if (!onlnf)
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return cpu_map__default_new();
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sep = 0;
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prev = -1;
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for (;;) {
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n = fscanf(onlnf, "%u%c", &cpu, &sep);
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if (n <= 0)
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break;
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if (prev >= 0) {
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int new_max = nr_cpus + cpu - prev - 1;
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if (new_max >= max_entries) {
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max_entries = new_max + MAX_NR_CPUS / 2;
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tmp = realloc(tmp_cpus, max_entries * sizeof(int));
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if (tmp == NULL)
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goto out_free_tmp;
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tmp_cpus = tmp;
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}
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while (++prev < cpu)
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tmp_cpus[nr_cpus++] = prev;
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}
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if (nr_cpus == max_entries) {
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max_entries += MAX_NR_CPUS;
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tmp = realloc(tmp_cpus, max_entries * sizeof(int));
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if (tmp == NULL)
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goto out_free_tmp;
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tmp_cpus = tmp;
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}
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tmp_cpus[nr_cpus++] = cpu;
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if (n == 2 && sep == '-')
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prev = cpu;
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else
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prev = -1;
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if (n == 1 || sep == '\n')
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break;
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}
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if (nr_cpus > 0)
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cpus = cpu_map__trim_new(nr_cpus, tmp_cpus);
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else
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cpus = cpu_map__default_new();
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out_free_tmp:
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free(tmp_cpus);
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fclose(onlnf);
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return cpus;
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}
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struct cpu_map *cpu_map__new(const char *cpu_list)
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{
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struct cpu_map *cpus = NULL;
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unsigned long start_cpu, end_cpu = 0;
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char *p = NULL;
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int i, nr_cpus = 0;
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int *tmp_cpus = NULL, *tmp;
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int max_entries = 0;
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if (!cpu_list)
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return cpu_map__read_all_cpu_map();
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if (!isdigit(*cpu_list))
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goto out;
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while (isdigit(*cpu_list)) {
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p = NULL;
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start_cpu = strtoul(cpu_list, &p, 0);
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if (start_cpu >= INT_MAX
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|| (*p != '\0' && *p != ',' && *p != '-'))
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goto invalid;
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if (*p == '-') {
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cpu_list = ++p;
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p = NULL;
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end_cpu = strtoul(cpu_list, &p, 0);
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if (end_cpu >= INT_MAX || (*p != '\0' && *p != ','))
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goto invalid;
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if (end_cpu < start_cpu)
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goto invalid;
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} else {
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end_cpu = start_cpu;
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}
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for (; start_cpu <= end_cpu; start_cpu++) {
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/* check for duplicates */
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for (i = 0; i < nr_cpus; i++)
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if (tmp_cpus[i] == (int)start_cpu)
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goto invalid;
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if (nr_cpus == max_entries) {
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max_entries += MAX_NR_CPUS;
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tmp = realloc(tmp_cpus, max_entries * sizeof(int));
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if (tmp == NULL)
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goto invalid;
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tmp_cpus = tmp;
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}
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tmp_cpus[nr_cpus++] = (int)start_cpu;
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}
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if (*p)
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++p;
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cpu_list = p;
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}
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if (nr_cpus > 0)
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cpus = cpu_map__trim_new(nr_cpus, tmp_cpus);
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else
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cpus = cpu_map__default_new();
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invalid:
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free(tmp_cpus);
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out:
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return cpus;
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}
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size_t cpu_map__fprintf(struct cpu_map *map, FILE *fp)
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{
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int i;
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size_t printed = fprintf(fp, "%d cpu%s: ",
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map->nr, map->nr > 1 ? "s" : "");
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for (i = 0; i < map->nr; ++i)
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printed += fprintf(fp, "%s%d", i ? ", " : "", map->map[i]);
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return printed + fprintf(fp, "\n");
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}
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struct cpu_map *cpu_map__dummy_new(void)
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{
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struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int));
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if (cpus != NULL) {
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cpus->nr = 1;
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cpus->map[0] = -1;
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}
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return cpus;
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}
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void cpu_map__delete(struct cpu_map *map)
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{
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free(map);
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}
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