tools/power turbostat: set max_num_cpus equal to the cpumask length

Future fixes will use sysfs files that contain cpumask output.  The code
needs to know the length of the cpumask in order to determine which cpus
are set in a cpumask.  Currently topo.max_cpu_num is the maximum cpu
number.  It can be increased the the maximum value of cpus represented in
cpumasks.

Set max_num_cpus to the length of a cpumask.

Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
index 6910773e85a9bcc72ebedd6501519e2b6567d7d8..1684f4ec627eeedbaa7e3be22e1f586d3ed4615c 100644 (file)
--- a/tools/power/x86/turbostat/turbostat.c
+++ b/tools/power/x86/turbostat/turbostat.c
@@ -2496,6 +2496,20 @@ void re_initialize(void)
        printf("turbostat: re-initialized with num_cpus %d\n", topo.num_cpus);
 }
 
+void set_max_cpu_num(void)
+{
+       FILE *filep;
+       unsigned long dummy;
+
+       topo.max_cpu_num = 0;
+       filep = fopen_or_die(
+                       "/sys/devices/system/cpu/cpu0/topology/thread_siblings",
+                       "r");
+       while (fscanf(filep, "%lx,", &dummy) == 1)
+               topo.max_cpu_num += 32;
+       fclose(filep);
+       topo.max_cpu_num--; /* 0 based */
+}
 
 /*
  * count_cpus()
@@ -2503,10 +2517,7 @@ void re_initialize(void)
  */
 int count_cpus(int cpu)
 {
-       if (topo.max_cpu_num < cpu)
-               topo.max_cpu_num = cpu;
-
-       topo.num_cpus += 1;
+       topo.num_cpus++;
        return 0;
 }
 int mark_cpu_present(int cpu)
@@ -4564,8 +4575,8 @@ void topology_probe()
        } *cpus;
 
        /* Initialize num_cpus, max_cpu_num */
+       set_max_cpu_num();
        topo.num_cpus = 0;
-       topo.max_cpu_num = 0;
        for_all_proc_cpus(count_cpus);
        if (!summary_only && topo.num_cpus > 1)
                BIC_PRESENT(BIC_CPU);