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1 | package PVE::CpuSet; | |
2 | ||
3 | use strict; | |
4 | use warnings; | |
5 | use PVE::Tools; | |
6 | use PVE::ProcFSTools; | |
7 | ||
8 | sub new { | |
9 | my ($class, $members) = @_; | |
10 | ||
11 | $members //= {}; | |
12 | my $self = bless { members => $members }, $class; | |
13 | ||
14 | return $self; | |
15 | } | |
16 | ||
17 | # Create a new set with the contents of a cgroup-v1 subdirectory | |
18 | sub new_from_cgroup { | |
19 | my ($class, $cgroup, $effective) = @_; | |
20 | ||
21 | my $kind = $effective ? 'effective_cpus' : 'cpus'; | |
22 | ||
23 | my $filename = "/sys/fs/cgroup/cpuset/$cgroup/cpuset.$kind"; | |
24 | my $set_text = PVE::Tools::file_read_firstline($filename) // ''; | |
25 | ||
26 | my ($count, $members) = parse_cpuset($set_text); | |
27 | ||
28 | die "got empty cpuset for cgroup '$cgroup'\n" | |
29 | if !$count; | |
30 | ||
31 | return $class->new($members); | |
32 | } | |
33 | ||
34 | sub parse_cpuset { | |
35 | my ($set_text) = @_; | |
36 | ||
37 | my $members = {}; | |
38 | my $count = 0; | |
39 | ||
40 | foreach my $part (split(/,/, $set_text)) { | |
41 | if ($part =~ /^\s*(\d+)(?:-(\d+))?\s*$/) { | |
42 | my ($from, $to) = ($1, $2); | |
43 | $to //= $1; | |
44 | die "invalid range: $part ($to < $from)\n" if $to < $from; | |
45 | for (my $i = $from; $i <= $to; $i++) { | |
46 | $members->{$i} = 1; | |
47 | $count++; | |
48 | }; | |
49 | } else { | |
50 | die "invalid range: $part\n"; | |
51 | } | |
52 | } | |
53 | ||
54 | return ($count, $members); | |
55 | } | |
56 | ||
57 | sub write_to_cgroup { | |
58 | my ($self, $cgroup) = @_; | |
59 | ||
60 | my $filename = "/sys/fs/cgroup/cpuset/$cgroup/cpuset.cpus"; | |
61 | ||
62 | my $value = ''; | |
63 | my @members = $self->members(); | |
64 | foreach my $cpuid (@members) { | |
65 | $value .= ',' if length($value); | |
66 | $value .= $cpuid; | |
67 | } | |
68 | ||
69 | die "unable to write empty cpu set\n" if !length($value); | |
70 | ||
71 | open(my $fh, '>', $filename) || die "failed to open '$filename' - $!\n"; | |
72 | PVE::Tools::safe_print($filename, $fh, "$value\n"); | |
73 | close($fh) || die "failed to close '$filename' - $!\n"; | |
74 | } | |
75 | ||
76 | sub insert { | |
77 | my ($self, @members) = @_; | |
78 | ||
79 | my $count = 0; | |
80 | ||
81 | foreach my $cpu (@members) { | |
82 | next if $self->{members}->{$cpu}; | |
83 | $self->{members}->{$cpu} = 1; | |
84 | $count++; | |
85 | } | |
86 | ||
87 | return $count; | |
88 | } | |
89 | ||
90 | sub delete { | |
91 | my ($self, @members) = @_; | |
92 | ||
93 | my $count = 0; | |
94 | ||
95 | foreach my $cpu (@members) { | |
96 | next if !$self->{members}->{$cpu}; | |
97 | delete $self->{members}->{$cpu}; | |
98 | $count++; | |
99 | } | |
100 | ||
101 | return $count; | |
102 | } | |
103 | ||
104 | sub has { | |
105 | my ($self, $cpuid) = @_; | |
106 | ||
107 | return $self->{members}->{$cpuid}; | |
108 | } | |
109 | ||
110 | # members: this list is always sorted! | |
111 | sub members { | |
112 | my ($self) = @_; | |
113 | ||
114 | return sort { $a <=> $b } keys %{$self->{members}}; | |
115 | } | |
116 | ||
117 | sub size { | |
118 | my ($self) = @_; | |
119 | ||
120 | return scalar(keys %{$self->{members}}); | |
121 | } | |
122 | ||
123 | sub is_equal { | |
124 | my ($self, $set2) = @_; | |
125 | ||
126 | my $members1 = $self->{members}; | |
127 | my $members2 = $set2->{members}; | |
128 | ||
129 | foreach my $id (keys %$members1) { | |
130 | return 0 if !$members2->{$id}; | |
131 | } | |
132 | foreach my $id (keys %$members2) { | |
133 | return 0 if !$members1->{$id}; | |
134 | } | |
135 | ||
136 | return 1; | |
137 | } | |
138 | ||
139 | sub short_string { | |
140 | my ($self) = @_; | |
141 | ||
142 | my @members = $self->members(); | |
143 | ||
144 | my $res = ''; | |
145 | my ($last, $next); | |
146 | foreach my $cpu (@members) { | |
147 | if (!defined($last)) { | |
148 | $last = $next = $cpu; | |
149 | } elsif (($next + 1) == $cpu) { | |
150 | $next = $cpu; | |
151 | } else { | |
152 | $res .= ',' if length($res); | |
153 | if ($last != $next) { | |
154 | $res .= "$last-$next"; | |
155 | } else { | |
156 | $res .= "$last"; | |
157 | } | |
158 | $last = $next = $cpu; | |
159 | } | |
160 | } | |
161 | ||
162 | if (defined($last)) { | |
163 | $res .= ',' if length($res); | |
164 | if ($last != $next) { | |
165 | $res .= "$last-$next"; | |
166 | } else { | |
167 | $res .= "$last"; | |
168 | } | |
169 | } | |
170 | ||
171 | return $res; | |
172 | } | |
173 | ||
174 | 1; |