lkml.org 
[lkml]   [2017]   [Jul]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 1/7] turbostat: set max_num_cpus equal to the cpumask length
Date
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>
Cc: Len Brown <len.brown@intel.com>
---
tools/power/x86/turbostat/turbostat.c | 21 ++++++++++++++++-----
1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
index 0dafba2c1e7d..6d368e744d27 100644
--- a/tools/power/x86/turbostat/turbostat.c
+++ b/tools/power/x86/turbostat/turbostat.c
@@ -2413,6 +2413,20 @@ 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()
@@ -2420,10 +2434,7 @@ 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)
@@ -4320,8 +4331,8 @@ 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);
--
1.8.5.5
\
 
 \ /
  Last update: 2017-07-16 22:51    [W:0.056 / U:69.336 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site