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a12b51c4 PM |
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 | int read_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 | } |