[pve-devel] [PATCH qemu-server v4 2/4] vmstatus: add memhost for host view of vm mem consumption

[Lukas Wagner]

On Sat Jul 26, 2025 at 3:06 AM CEST, Aaron Lauterer wrote:
> +        my $fh = IO::File->new("/sys/fs/cgroup/qemu.slice/${vmid}.scope/cgroup.procs", "r");
> +        if ($fh) {
> +            while (my $childPid = <$fh>) {
> +                chomp($childPid);

nit: should be snake_case

> +                open(my $SMAPS_FH, '<', "/proc/$childPid/smaps_rollup")
> +                    or die "failed to open PSS memory-stat from process - $!\n";
> +
> +                while (my $line = <$SMAPS_FH>) {
> +                    if ($line =~ m/^Pss:\s+([0-9]+) kB$/) {
> +                        $d->{memhost} = $d->{memhost} + int($1) * 1024;

Why do you sum up $d->{memhost} with the thing you just read from /proc?
As far as I can tell memhost should always be zero at this point....


> +                        last;

... and also you break here from the loop, so even if there were two Pss
lines, you wouldn't add them up.

Am I missing something? :)

> +                    }
> +                }
> +                close $SMAPS_FH;
> +            }
> +        }
> +        close($fh);
> +
>          my $pressures = PVE::ProcFSTools::read_cgroup_pressure("qemu.slice/${vmid}.scope");
>          $d->{pressurecpusome} = $pressures->{cpu}->{some}->{avg10} * 1;
>          $d->{pressurecpufull} = $pressures->{cpu}->{full}->{avg10} * 1;
> @@ -2707,7 +2732,6 @@ sub vmstatus {
>          } else {
>              $d->{cpu} = $old->{cpu};
>          }
> -
>      }
>  
>      return $res if !$full;