Werk #6735: cpu_util_unix: Fixed calculation of CPU usage on UNIX

Komponente Checks & agents
Titel cpu_util_unix: Fixed calculation of CPU usage on UNIX
Datum 27.09.2018
Checkmk Edition Checkmk Raw (CRE)
Checkmk-Version 1.4.0p37 1.5.0p5 1.6.0b1
Level Kleine Änderung
Klasse Bugfix
Kompatibilität Kompatibel - benötigt kein manuelles Eingreifen

The result of the cpu_usage is wrong. The cpu_time_guest is included in cpu_time_user: See https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/kernel/sched/cputime.c for more information:

 * Account guest CPU time to a process.
 * @p: the process that the CPU time gets accounted to
 * @cputime: the CPU time spent in virtual machine since the last update
void account_guest_time(struct task_struct *p, u64 cputime)
    u64 *cpustat = kcpustat_this_cpu->cpustat;

    /* Add guest time to process. */
    p->utime += cputime;
    account_group_user_time(p, cputime);
    p->gtime += cputime;

    /* Add guest time to cpustat. */
    if (task_nice(p) > 0) {
        cpustat[CPUTIME_NICE] += cputime;
        cpustat[CPUTIME_GUEST_NICE] += cputime;
    } else {
        cpustat[CPUTIME_USER] += cputime;
        cpustat[CPUTIME_GUEST] += cputime;

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