#include "util.h" | |
#include "../perf.h" | |
#include "cpumap.h" | |
#include <assert.h> | |
#include <stdio.h> | |
int cpumap[MAX_NR_CPUS]; | |
static int default_cpu_map(void) | |
{ | |
int nr_cpus, i; | |
nr_cpus = sysconf(_SC_NPROCESSORS_ONLN); | |
assert(nr_cpus <= MAX_NR_CPUS); | |
assert((int)nr_cpus >= 0); | |
for (i = 0; i < nr_cpus; ++i) | |
cpumap[i] = i; | |
return nr_cpus; | |
} | |
int read_cpu_map(void) | |
{ | |
FILE *onlnf; | |
int nr_cpus = 0; | |
int n, cpu, prev; | |
char sep; | |
onlnf = fopen("/sys/devices/system/cpu/online", "r"); | |
if (!onlnf) | |
return default_cpu_map(); | |
sep = 0; | |
prev = -1; | |
for (;;) { | |
n = fscanf(onlnf, "%u%c", &cpu, &sep); | |
if (n <= 0) | |
break; | |
if (prev >= 0) { | |
assert(nr_cpus + cpu - prev - 1 < MAX_NR_CPUS); | |
while (++prev < cpu) | |
cpumap[nr_cpus++] = prev; | |
} | |
assert (nr_cpus < MAX_NR_CPUS); | |
cpumap[nr_cpus++] = cpu; | |
if (n == 2 && sep == '-') | |
prev = cpu; | |
else | |
prev = -1; | |
if (n == 1 || sep == '\n') | |
break; | |
} | |
fclose(onlnf); | |
if (nr_cpus > 0) | |
return nr_cpus; | |
return default_cpu_map(); | |
} |