1 #include "util.h" 2 #include "../perf.h" 3 #include "cpumap.h" 4 #include <assert.h> 5 #include <stdio.h> 6 7 int cpumap[MAX_NR_CPUS]; 8 9 static int default_cpu_map(void) 10 { 11 int nr_cpus, i; 12 13 nr_cpus = sysconf(_SC_NPROCESSORS_ONLN); 14 assert(nr_cpus <= MAX_NR_CPUS); 15 assert((int)nr_cpus >= 0); 16 17 for (i = 0; i < nr_cpus; ++i) 18 cpumap[i] = i; 19 20 return nr_cpus; 21 } 22 23 static int read_all_cpu_map(void) 24 { 25 FILE *onlnf; 26 int nr_cpus = 0; 27 int n, cpu, prev; 28 char sep; 29 30 onlnf = fopen("/sys/devices/system/cpu/online", "r"); 31 if (!onlnf) 32 return default_cpu_map(); 33 34 sep = 0; 35 prev = -1; 36 for (;;) { 37 n = fscanf(onlnf, "%u%c", &cpu, &sep); 38 if (n <= 0) 39 break; 40 if (prev >= 0) { 41 assert(nr_cpus + cpu - prev - 1 < MAX_NR_CPUS); 42 while (++prev < cpu) 43 cpumap[nr_cpus++] = prev; 44 } 45 assert (nr_cpus < MAX_NR_CPUS); 46 cpumap[nr_cpus++] = cpu; 47 if (n == 2 && sep == '-') 48 prev = cpu; 49 else 50 prev = -1; 51 if (n == 1 || sep == '\n') 52 break; 53 } 54 fclose(onlnf); 55 if (nr_cpus > 0) 56 return nr_cpus; 57 58 return default_cpu_map(); 59 } 60 61 int read_cpu_map(const char *cpu_list) 62 { 63 unsigned long start_cpu, end_cpu = 0; 64 char *p = NULL; 65 int i, nr_cpus = 0; 66 67 if (!cpu_list) 68 return read_all_cpu_map(); 69 70 if (!isdigit(*cpu_list)) 71 goto invalid; 72 73 while (isdigit(*cpu_list)) { 74 p = NULL; 75 start_cpu = strtoul(cpu_list, &p, 0); 76 if (start_cpu >= INT_MAX 77 || (*p != '\0' && *p != ',' && *p != '-')) 78 goto invalid; 79 80 if (*p == '-') { 81 cpu_list = ++p; 82 p = NULL; 83 end_cpu = strtoul(cpu_list, &p, 0); 84 85 if (end_cpu >= INT_MAX || (*p != '\0' && *p != ',')) 86 goto invalid; 87 88 if (end_cpu < start_cpu) 89 goto invalid; 90 } else { 91 end_cpu = start_cpu; 92 } 93 94 for (; start_cpu <= end_cpu; start_cpu++) { 95 /* check for duplicates */ 96 for (i = 0; i < nr_cpus; i++) 97 if (cpumap[i] == (int)start_cpu) 98 goto invalid; 99 100 assert(nr_cpus < MAX_NR_CPUS); 101 cpumap[nr_cpus++] = (int)start_cpu; 102 } 103 if (*p) 104 ++p; 105 106 cpu_list = p; 107 } 108 if (nr_cpus > 0) 109 return nr_cpus; 110 111 return default_cpu_map(); 112 invalid: 113 return -1; 114 } 115