Commit | Line | Data |
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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 | ||
c45c6ea2 | 23 | static int read_all_cpu_map(void) |
a12b51c4 PM |
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 | } | |
c45c6ea2 SE |
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 | } |