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tools/power turbostat: Use sched_getcpu() instead of hardcoded cpu 0 

Disabling cpu 0 results in an error

turbostat: /sys/devices/system/cpu/cpu0/topology/thread_siblings: open failed: No such file or directory

Use sched_getcpu() instead of a hardcoded cpu 0 to get the max cpu number.

Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Prarit Bhargava 2020-06-29 15:26:57 -04:00 committed by Len Brown
parent 9972d5d84d
commit 8201a02857
1 changed files with 10 additions and 3 deletions
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13
tools/power/x86/turbostat/turbostat.c
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@ -2865,12 +2865,19 @@ void re_initialize(void)
void set_max_cpu_num(void) void set_max_cpu_num(void)
{ {
FILE *filep; FILE *filep;
int base_cpu;
unsigned long dummy; unsigned long dummy;
char pathname[64];
base_cpu = sched_getcpu();
if (base_cpu < 0)
err(1, "cannot find calling cpu ID");
sprintf(pathname,
"/sys/devices/system/cpu/cpu%d/topology/thread_siblings",
base_cpu);
filep = fopen_or_die(pathname, "r");
topo.max_cpu_num = 0; topo.max_cpu_num = 0;
filep = fopen_or_die(
"/sys/devices/system/cpu/cpu0/topology/thread_siblings",
"r");
while (fscanf(filep, "%lx,", &dummy) == 1) while (fscanf(filep, "%lx,", &dummy) == 1)
topo.max_cpu_num += BITMASK_SIZE; topo.max_cpu_num += BITMASK_SIZE;
fclose(filep); fclose(filep);