From 05a8c77433c79a89734b6d77c63dc07b2192e022 Mon Sep 17 00:00:00 2001
From: Johannes Ziemke <github@5pi.de>
Date: Tue, 3 Sep 2024 10:30:09 +0200
Subject: [PATCH] Convert AIX cpu usage to seconds

---
 collector/cpu_aix.go | 36 ++++++++++++++++++++++++++++--------
 1 file changed, 28 insertions(+), 8 deletions(-)

diff --git a/collector/cpu_aix.go b/collector/cpu_aix.go
index 3cfd79c343..a5f99f34de 100644
--- a/collector/cpu_aix.go
+++ b/collector/cpu_aix.go
@@ -16,7 +16,13 @@
 
 package collector
 
+/*
+#include <unistd.h>  // Include the standard Unix header
+#include <errno.h>   // For errno
+*/
+import "C"
 import (
+	"fmt"
 	"strconv"
 
 	"github.com/go-kit/log"
@@ -25,18 +31,32 @@ import (
 )
 
 type cpuCollector struct {
-	cpu    typedDesc
-	logger log.Logger
+	cpu           typedDesc
+	logger        log.Logger
+	tickPerSecond int64
 }
 
 func init() {
 	registerCollector("cpu", defaultEnabled, NewCpuCollector)
 }
 
+func tickPerSecond() (int64, error) {
+	ticks, err := C.sysconf(C._SC_CLK_TCK)
+	if ticks == -1 || err != nil {
+		return 0, fmt.Errorf("failed to get clock ticks per second: %v", err)
+	}
+	return int64(ticks), nil
+}
+
 func NewCpuCollector(logger log.Logger) (Collector, error) {
+	ticks, err := tickPerSecond()
+	if err != nil {
+		return nil, err
+	}
 	return &cpuCollector{
-		cpu:    typedDesc{nodeCPUSecondsDesc, prometheus.CounterValue},
-		logger: logger,
+		cpu:           typedDesc{nodeCPUSecondsDesc, prometheus.CounterValue},
+		logger:        logger,
+		tickPerSecond: ticks,
 	}, nil
 }
 
@@ -47,10 +67,10 @@ func (c *cpuCollector) Update(ch chan<- prometheus.Metric) error {
 	}
 
 	for n, stat := range stats {
-		ch <- c.cpu.mustNewConstMetric(float64(stat.User), strconv.Itoa(n), "user")
-		ch <- c.cpu.mustNewConstMetric(float64(stat.Sys), strconv.Itoa(n), "system")
-		ch <- c.cpu.mustNewConstMetric(float64(stat.Idle), strconv.Itoa(n), "idle")
-		ch <- c.cpu.mustNewConstMetric(float64(stat.Wait), strconv.Itoa(n), "wait")
+		ch <- c.cpu.mustNewConstMetric(float64(stat.User/c.tickPerSecond), strconv.Itoa(n), "user")
+		ch <- c.cpu.mustNewConstMetric(float64(stat.Sys/c.tickPerSecond), strconv.Itoa(n), "system")
+		ch <- c.cpu.mustNewConstMetric(float64(stat.Idle/c.tickPerSecond), strconv.Itoa(n), "idle")
+		ch <- c.cpu.mustNewConstMetric(float64(stat.Wait/c.tickPerSecond), strconv.Itoa(n), "wait")
 	}
 	return nil
 }