util: kernel: Read stationary values once

Since statinary kernel sysfs or procfs nodes is not have to be
read every time, it lets them being read once.

Change-Id: Icee5f825694867ecb84847fd46830274fe8219d3
Signed-off-by: Dongwoo Lee <dwoo08.lee@samsung.com>

diff --git a/src/util/kernel.c b/src/util/kernel.c
index 490432f..41c1637 100644 (file)
--- a/src/util/kernel.c
+++ b/src/util/kernel.c
@@ -105,7 +105,12 @@ int kernel_get_online_cpu_num(void)
 
 int kernel_get_possible_cpu_num(void)
 {
-       return __get_cpu_num("/sys/devices/system/cpu/possible");
+       static int possible = 0;
+
+       if (!possible)
+               possible = __get_cpu_num("/sys/devices/system/cpu/possible");
+
+       return possible;
 }
 
 int kernel_get_total_cpu_stat(struct cpu_stat *total)