overlay: Scale the CPU busy value by the numer of active cores

Having 100% always mean one processor fully utilised is much easier to
understand (than having to remember how many cores are on each machine
and scale appropriately).

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 10 insertions, 0 deletions

diff --git a/overlay/cpu-top.c b/overlay/cpu-top.c
index 4e31da1b..c134d409 100644
--- a/overlay/cpu-top.c
+++ b/overlay/cpu-top.c
@@ -25,10 +25,20 @@
 #include <stdio.h>
 #include <unistd.h>
 #include <fcntl.h>
+#include <string.h>
 #include <errno.h>
 
 #include "cpu-top.h"
 
+int cpu_top_init(struct cpu_top *cpu)
+{
+	memset(cpu, 0, sizeof(*cpu));
+
+	cpu->nr_cpu = sysconf(_SC_NPROCESSORS_ONLN);
+
+	return 0;
+}
+
 int cpu_top_update(struct cpu_top *cpu)
 {
 	struct cpu_stat *s = &cpu->stat[cpu->count++&1];