+package PVE::CpuSet;
+
+use strict;
+use warnings;
+use PVE::Tools;
+
+our $MAX_CPUID = 256; # should be enough for the next years
+
+sub new {
+ my ($this) = @_;
+
+ my $class = ref($this) || $this;
+
+ my $self = bless { members => {} }, $class;
+
+ return $self;
+}
+
+sub new_from_cgroup {
+ my ($this, $cgroup, $kind) = @_;
+
+ $kind //= 'cpus';
+
+ my $filename = "/sys/fs/cgroup/cpuset/$cgroup/cpuset.$kind";
+ my $set_text = PVE::Tools::file_read_firstline($filename) // '';
+
+ my $cpuset = $this->new();
+
+ my $members = $cpuset->{members};
+
+ my $count = 0;
+
+ foreach my $part (split(/,/, $set_text)) {
+ if ($part =~ /^\s*(\d+)(?:-(\d+))?\s*$/) {
+ my ($from, $to) = ($1, $2);
+ $to //= $1;
+ die "cpu id '$from' is out of range\n" if $from >= $MAX_CPUID;
+ die "cpu id '$to' is out of range\n" if $to >= $MAX_CPUID;
+ die "invalid range: $part ($to < $from)\n" if $to < $from;
+ for (my $i = $from; $i <= $to; $i++) {
+ $members->{$i} = 1;
+ $count++;
+ };
+ } else {
+ die "invalid range: $part\n";
+ }
+ }
+
+ die "got empty cpuset for cgroup '$cgroup'\n"
+ if !$count;
+
+ return $cpuset;
+}
+
+sub write_to_cgroup {
+ my ($self, $cgroup) = @_;
+
+ my $filename = "/sys/fs/cgroup/cpuset/$cgroup/cpuset.cpus";
+
+ my $value = '';
+ my @members = $self->members();
+ foreach my $cpuid (@members) {
+ $value .= ',' if length($value);
+ $value .= $cpuid;
+ }
+
+ die "unable to write empty cpu set\n" if !length($value);
+
+ open(my $fh, '>', $filename) || die "failed to open '$filename' - $!\n";
+ PVE::Tools::safe_print($filename, $fh, "$value\n");
+ close($fh);
+}
+
+sub insert {
+ my ($self, @members) = @_;
+
+ my $count = 0;
+
+ foreach my $cpu (@members) {
+ die "cpu id '$cpu' is out of range\n" if $cpu >= $MAX_CPUID;
+ next if $self->{members}->{$cpu};
+ $self->{members}->{$cpu} = 1;
+ $count++;
+ }
+
+ return $count;
+}
+
+sub delete {
+ my ($self, @members) = @_;
+
+ my $count = 0;
+
+ foreach my $cpu (@members) {
+ die "cpu id '$cpu' is out of range\n" if $cpu >= $MAX_CPUID;
+ next if !$self->{members}->{$cpu};
+ delete $self->{members}->{$cpu};
+ $count++;
+ }
+
+ return $count;
+}
+
+sub has {
+ my ($self, $cpuid) = @_;
+
+ return $self->{members}->{$cpuid};
+}
+
+# members: this list is always sorted!
+sub members {
+ my ($self) = @_;
+
+ return sort keys %{$self->{members}};
+}
+
+sub size {
+ my ($self) = @_;
+
+ return scalar(keys %{$self->{members}});
+}
+
+sub is_equal {
+ my ($self, $set2) = @_;
+
+ my $members1 = $self->{members};
+ my $members2 = $set2->{members};
+
+ foreach my $id (keys %$members1) {
+ return 0 if !$members2->{$id};
+ }
+ foreach my $id (keys %$members2) {
+ return 0 if !$members1->{$id};
+ }
+
+ return 1;
+}
+
+1;