[pve-devel] [PATCH pve-common 1/1] ProcFSTools: add read_pressure

[Alexandre Derumier]

Hi,
I have notice that it's possible to get pressure info for each vm/ct
through cgroups

/sys/fs/cgroup/unified/qemu.slice/<vmid>.scope/cpu.pressure
/sys/fs/cgroup/unified/lxc/<vmid>/cpu.pressure


Maybe it could be great to have some new rrd graphs for each vm/ct ?
They are very useful counters to known a specific vm/ct is overloaded


Le mar. 6 oct. 2020 à 13:58, Alexandre Derumier <aderumier at odiso.com> a
écrit :

> read new /proc/pressure/(cpu,disk,io) introduced in kernel 4.20.
>
> This give more granular informations than loadaverage.
>
> Signed-off-by: Alexandre Derumier <aderumier at odiso.com>
> ---
>  src/PVE/ProcFSTools.pm | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
>
> diff --git a/src/PVE/ProcFSTools.pm b/src/PVE/ProcFSTools.pm
> index 7cf1472..7687c13 100644
> --- a/src/PVE/ProcFSTools.pm
> +++ b/src/PVE/ProcFSTools.pm
> @@ -132,6 +132,24 @@ sub read_loadavg {
>      return wantarray ? (0, 0, 0) : 0;
>  }
>
> +sub read_pressure {
> +
> +    my $res = {};
> +    foreach my $type (qw(cpu memory io)) {
> +       if (my $fh = IO::File->new ("/proc/pressure/$type", "r")) {
> +           while (defined (my $line = <$fh>)) {
> +               if ($line =~
> /^(some|full)\s+avg10\=(\d+\.\d+)\s+avg60\=(\d+\.\d+)\s+avg300\=(\d+\.\d+)\s+total\=(\d+)/)
> {
> +                   $res->{$type}->{$1}->{avg10} = $2;
> +                   $res->{$type}->{$1}->{avg60} = $3;
> +                   $res->{$type}->{$1}->{avg300} = $4;
> +               }
> +           }
> +           $fh->close;
> +       }
> +    }
> +    return $res;
> +}
> +
>  my $last_proc_stat;
>
>  sub read_proc_stat {
> --
> 2.20.1
>
>