mirror of https://gitee.com/openkylin/linux.git
115 lines
2.0 KiB
C
115 lines
2.0 KiB
C
#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;
|
|
}
|
|
|
|
static int read_all_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();
|
|
}
|
|
|
|
int read_cpu_map(const char *cpu_list)
|
|
{
|
|
unsigned long start_cpu, end_cpu = 0;
|
|
char *p = NULL;
|
|
int i, nr_cpus = 0;
|
|
|
|
if (!cpu_list)
|
|
return read_all_cpu_map();
|
|
|
|
if (!isdigit(*cpu_list))
|
|
goto invalid;
|
|
|
|
while (isdigit(*cpu_list)) {
|
|
p = NULL;
|
|
start_cpu = strtoul(cpu_list, &p, 0);
|
|
if (start_cpu >= INT_MAX
|
|
|| (*p != '\0' && *p != ',' && *p != '-'))
|
|
goto invalid;
|
|
|
|
if (*p == '-') {
|
|
cpu_list = ++p;
|
|
p = NULL;
|
|
end_cpu = strtoul(cpu_list, &p, 0);
|
|
|
|
if (end_cpu >= INT_MAX || (*p != '\0' && *p != ','))
|
|
goto invalid;
|
|
|
|
if (end_cpu < start_cpu)
|
|
goto invalid;
|
|
} else {
|
|
end_cpu = start_cpu;
|
|
}
|
|
|
|
for (; start_cpu <= end_cpu; start_cpu++) {
|
|
/* check for duplicates */
|
|
for (i = 0; i < nr_cpus; i++)
|
|
if (cpumap[i] == (int)start_cpu)
|
|
goto invalid;
|
|
|
|
assert(nr_cpus < MAX_NR_CPUS);
|
|
cpumap[nr_cpus++] = (int)start_cpu;
|
|
}
|
|
if (*p)
|
|
++p;
|
|
|
|
cpu_list = p;
|
|
}
|
|
if (nr_cpus > 0)
|
|
return nr_cpus;
|
|
|
|
return default_cpu_map();
|
|
invalid:
|
|
return -1;
|
|
}
|