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authorPrarit Bhargava <prarit@redhat.com>2018-06-01 17:04:28 +0300
committerLen Brown <len.brown@intel.com>2018-06-02 06:12:46 +0300
commit843c57916dde0e260e500e4ae1a443a7d7fbe962 (patch)
tree84762eb24cde5bd74d899949eb41719e458b88d3 /tools/power
parent023fe0ac975e4dff592ce90bbd12747dedf7c598 (diff)
downloadlinux-843c57916dde0e260e500e4ae1a443a7d7fbe962.tar.xz
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>
Diffstat (limited to 'tools/power')
-rw-r--r--tools/power/x86/turbostat/turbostat.c21
1 files changed, 16 insertions, 5 deletions
diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
index 6910773e85a9..1684f4ec627e 100644
--- 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);