cfae8ae3d2
For now we just parse the CPU "time-spent" counters and calculate the
CPU usage of the whole system. As we do not want a total average we
use a state-full implementation, which calculates the usage since the
last request (if older than 1 second).
Somewhat modeled after our Perl version of this. But for the "total"
we do not use the:
> ($ctime - $last_proc_stat->{ctime}) * $clock_ticks * $cpucount;
calculation, but just add _all_ fields together, as that is the total
of CPU time.
Use a Reader-Writer lock to sync updating. First check under the
reader lock if the data is recent enough, else update it under the
writer lock.
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
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