820 lines
26 KiB
Perl
820 lines
26 KiB
Perl
package PVE::QemuServer::Memory;
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use strict;
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use warnings;
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use PVE::JSONSchema qw(parse_property_string);
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use PVE::Tools qw(run_command lock_file lock_file_full file_read_firstline dir_glob_foreach);
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use PVE::Exception qw(raise raise_param_exc);
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use PVE::QemuServer::Helpers qw(parse_number_sets);
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use PVE::QemuServer::Monitor qw(mon_cmd);
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use PVE::QemuServer::QMPHelpers qw(qemu_devicedel qemu_objectdel);
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use base qw(Exporter);
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our @EXPORT_OK = qw(
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get_current_memory
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);
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our $MAX_NUMA = 8;
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my $numa_fmt = {
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cpus => {
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type => "string",
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pattern => qr/\d+(?:-\d+)?(?:;\d+(?:-\d+)?)*/,
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description => "CPUs accessing this NUMA node.",
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format_description => "id[-id];...",
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},
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memory => {
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type => "number",
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description => "Amount of memory this NUMA node provides.",
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optional => 1,
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},
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hostnodes => {
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type => "string",
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pattern => qr/\d+(?:-\d+)?(?:;\d+(?:-\d+)?)*/,
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description => "Host NUMA nodes to use.",
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format_description => "id[-id];...",
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optional => 1,
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},
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policy => {
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type => 'string',
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enum => [qw(preferred bind interleave)],
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description => "NUMA allocation policy.",
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verbose_description => <<EODESC,
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NUMA allocation policy. Possible values are:
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- preferred: prefer the given host node list for allocation
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- bind: restrict memory allocation to the given host node list
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- interleave: interleave memory allocations across the given host node list
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The models are explained in more details in the kernel's documentation
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https://docs.kernel.org/admin-guide/mm/numa_memory_policy.html#components-of-memory-policies.
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EODESC
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optional => 1,
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},
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};
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PVE::JSONSchema::register_format('pve-qm-numanode', $numa_fmt);
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our $numadesc = {
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optional => 1,
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type => 'string',
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format => $numa_fmt,
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description => "NUMA topology.",
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};
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PVE::JSONSchema::register_standard_option("pve-qm-numanode", $numadesc);
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sub parse_numa {
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my ($data) = @_;
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my $res = parse_property_string($numa_fmt, $data);
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$res->{cpus} = parse_number_sets($res->{cpus}) if defined($res->{cpus});
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$res->{hostnodes} = parse_number_sets($res->{hostnodes}) if defined($res->{hostnodes});
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return $res;
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}
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my $STATICMEM = 1024;
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our $memory_fmt = {
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current => {
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description =>
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"Current amount of online RAM for the VM in MiB. This is the maximum available memory when"
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. " you use the balloon device.",
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type => 'integer',
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default_key => 1,
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minimum => 16,
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default => 512,
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},
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};
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sub print_memory {
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my $memory = shift;
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return PVE::JSONSchema::print_property_string($memory, $memory_fmt);
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}
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sub parse_memory {
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my ($value) = @_;
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return { current => $memory_fmt->{current}->{default} } if !defined($value);
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my $res = PVE::JSONSchema::parse_property_string($memory_fmt, $value);
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return $res;
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}
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my sub get_max_mem {
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my ($conf) = @_;
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my $cpu = {};
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if (my $cpu_prop_str = $conf->{cpu}) {
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$cpu = PVE::JSONSchema::parse_property_string('pve-vm-cpu-conf', $cpu_prop_str)
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or die "Cannot parse cpu description: $cpu_prop_str\n";
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}
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my $bits;
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if (my $phys_bits = $cpu->{'phys-bits'}) {
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if ($phys_bits eq 'host') {
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$bits = PVE::QemuServer::Helpers::get_host_phys_address_bits();
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} elsif ($phys_bits =~ /^(\d+)$/) {
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$bits = int($phys_bits);
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}
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}
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if (!defined($bits)) {
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# fixme: what fallback?
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my $host_bits = PVE::QemuServer::Helpers::get_host_phys_address_bits() // 36;
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if ($cpu->{cputype} && $cpu->{cputype} =~ /^(host|max)$/) {
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$bits = $host_bits;
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} else {
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$bits = $host_bits > 40 ? 40 : $host_bits; # take the smaller one
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}
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}
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$bits = $bits & ~1; # round down to nearest even as limit is lower with odd bit sizes
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# heuristic: remove 20 bits to get MiB and half that as QEMU needs some overhead
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my $bits_to_max_mem = int(1 << ($bits - 21));
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return $bits_to_max_mem > 4 * 1024 * 1024 ? 4 * 1024 * 1024 : $bits_to_max_mem;
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}
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sub get_current_memory {
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my ($value) = @_;
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my $memory = parse_memory($value);
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return $memory->{current};
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}
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sub get_numa_node_list {
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my ($conf) = @_;
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my @numa_map;
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for (my $i = 0; $i < $MAX_NUMA; $i++) {
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my $entry = $conf->{"numa$i"} or next;
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my $numa = parse_numa($entry) or next;
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push @numa_map, $i;
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}
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return @numa_map if @numa_map;
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my $sockets = $conf->{sockets} || 1;
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return (0 .. ($sockets - 1));
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}
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sub host_numanode_exists {
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my ($id) = @_;
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return -d "/sys/devices/system/node/node$id/";
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}
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# only valid when numa nodes map to a single host node
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sub get_numa_guest_to_host_map {
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my ($conf) = @_;
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my $map = {};
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for (my $i = 0; $i < $MAX_NUMA; $i++) {
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my $entry = $conf->{"numa$i"} or next;
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my $numa = parse_numa($entry) or next;
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$map->{$i} = print_numa_hostnodes($numa->{hostnodes});
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}
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return $map if %$map;
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my $sockets = $conf->{sockets} || 1;
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return { map { $_ => $_ } (0 .. ($sockets - 1)) };
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}
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sub foreach_dimm {
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my ($conf, $vmid, $memory, $static_memory, $func) = @_;
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my $dimm_id = 0;
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my $current_size = $static_memory;
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my $dimm_size = 0;
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if ($conf->{hugepages} && $conf->{hugepages} == 1024) {
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$dimm_size = 1024;
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} else {
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$dimm_size = 512;
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}
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return if $current_size == $memory;
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my @numa_map = get_numa_node_list($conf);
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for (my $j = 0; $j < 8; $j++) {
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for (my $i = 0; $i < 32; $i++) {
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my $name = "dimm${dimm_id}";
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$dimm_id++;
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my $numanode = $numa_map[$i % @numa_map];
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$current_size += $dimm_size;
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&$func($conf, $vmid, $name, $dimm_size, $numanode, $current_size, $memory);
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return $current_size if $current_size >= $memory;
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}
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$dimm_size *= 2;
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}
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}
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sub qemu_memory_hotplug {
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my ($vmid, $conf, $value) = @_;
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return $value if !PVE::QemuServer::Helpers::vm_running_locally($vmid);
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my $oldmem = parse_memory($conf->{memory});
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my $newmem = parse_memory($value);
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return $value if $newmem->{current} == $oldmem->{current};
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my $memory = $oldmem->{current};
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$value = $newmem->{current};
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my $sockets = $conf->{sockets} || 1;
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my $static_memory = $STATICMEM;
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$static_memory = $static_memory * $sockets
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if ($conf->{hugepages} && $conf->{hugepages} == 1024);
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die "memory can't be lower than $static_memory MB" if $value < $static_memory;
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my $MAX_MEM = get_max_mem($conf);
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die "you cannot add more memory than max mem $MAX_MEM MB!\n" if $value > $MAX_MEM;
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if ($value > $memory) {
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my $numa_hostmap;
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foreach_dimm(
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$conf,
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$vmid,
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$value,
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$static_memory,
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sub {
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my ($conf, $vmid, $name, $dimm_size, $numanode, $current_size, $memory) = @_;
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return if $current_size <= get_current_memory($conf->{memory});
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if ($conf->{hugepages}) {
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$numa_hostmap = get_numa_guest_to_host_map($conf) if !$numa_hostmap;
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my $hugepages_size = hugepages_size($conf, $dimm_size);
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my $path = hugepages_mount_path($hugepages_size);
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my $host_numanode = $numa_hostmap->{$numanode};
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my $hugepages_topology->{$hugepages_size}->{$host_numanode} =
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hugepages_nr($dimm_size, $hugepages_size);
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my $code = sub {
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my $hugepages_host_topology = hugepages_host_topology();
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hugepages_allocate($hugepages_topology, $hugepages_host_topology);
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eval {
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mon_cmd(
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$vmid, "object-add",
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'qom-type' => "memory-backend-file",
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id => "mem-$name",
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size => int($dimm_size * 1024 * 1024),
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'mem-path' => $path,
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share => JSON::true,
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prealloc => JSON::true,
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);
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};
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if (my $err = $@) {
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hugepages_reset($hugepages_host_topology);
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die $err;
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}
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hugepages_pre_deallocate($hugepages_topology);
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};
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eval { hugepages_update_locked($code); };
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} else {
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eval {
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mon_cmd(
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$vmid, "object-add",
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'qom-type' => "memory-backend-ram",
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id => "mem-$name",
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size => int($dimm_size * 1024 * 1024),
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);
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};
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}
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if (my $err = $@) {
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eval { qemu_objectdel($vmid, "mem-$name"); };
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die $err;
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}
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eval {
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mon_cmd(
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$vmid, "device_add",
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driver => "pc-dimm",
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id => "$name",
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memdev => "mem-$name",
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node => $numanode,
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);
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};
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if (my $err = $@) {
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eval { qemu_objectdel($vmid, "mem-$name"); };
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die $err;
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}
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# update conf after each successful module hotplug
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$newmem->{current} = $current_size;
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$conf->{memory} = print_memory($newmem);
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PVE::QemuConfig->write_config($vmid, $conf);
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},
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);
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} else {
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my $dimms = qemu_memdevices_list($vmid, 'dimm');
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my $current_size = $memory;
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for my $name (sort { ($b =~ /^dimm(\d+)$/)[0] <=> ($a =~ /^dimm(\d+)$/)[0] } keys %$dimms) {
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my $dimm_size = $dimms->{$name}->{size} / 1024 / 1024;
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last if $current_size <= $value;
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print "try to unplug memory dimm $name\n";
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my $retry = 0;
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while (1) {
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eval { qemu_devicedel($vmid, $name) };
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sleep 3;
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my $dimm_list = qemu_memdevices_list($vmid, 'dimm');
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last if !$dimm_list->{$name};
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raise_param_exc({ $name => "error unplug memory module" }) if $retry > 5;
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$retry++;
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}
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$current_size -= $dimm_size;
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# update conf after each successful module unplug
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$newmem->{current} = $current_size;
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$conf->{memory} = print_memory($newmem);
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eval { qemu_objectdel($vmid, "mem-$name"); };
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PVE::QemuConfig->write_config($vmid, $conf);
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}
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}
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return $conf->{memory};
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}
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sub qemu_memdevices_list {
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my ($vmid, $type) = @_;
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my $dimmarray = mon_cmd($vmid, "query-memory-devices");
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my $dimms = {};
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foreach my $dimm (@$dimmarray) {
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next if $type && $dimm->{data}->{id} !~ /^$type(\d+)$/;
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$dimms->{ $dimm->{data}->{id} }->{id} = $dimm->{data}->{id};
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$dimms->{ $dimm->{data}->{id} }->{node} = $dimm->{data}->{node};
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$dimms->{ $dimm->{data}->{id} }->{addr} = $dimm->{data}->{addr};
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$dimms->{ $dimm->{data}->{id} }->{size} = $dimm->{data}->{size};
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$dimms->{ $dimm->{data}->{id} }->{slot} = $dimm->{data}->{slot};
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}
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return $dimms;
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}
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sub config {
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my ($conf, $vmid, $sockets, $cores, $hotplug, $virtiofs_enabled, $cmd, $machine_flags) = @_;
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my $memory = get_current_memory($conf->{memory});
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my $static_memory = 0;
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if ($hotplug) {
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die "NUMA needs to be enabled for memory hotplug\n" if !$conf->{numa};
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my $MAX_MEM = get_max_mem($conf);
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die "Total memory is bigger than ${MAX_MEM}MB\n" if $memory > $MAX_MEM;
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for (my $i = 0; $i < $MAX_NUMA; $i++) {
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die "cannot enable memory hotplugging with custom NUMA topology\n"
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if $conf->{"numa$i"};
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}
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my $sockets = $conf->{sockets} || 1;
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$static_memory = $STATICMEM;
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$static_memory = $static_memory * $sockets
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if ($conf->{hugepages} && $conf->{hugepages} == 1024);
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die "minimum memory must be ${static_memory}MB\n" if ($memory < $static_memory);
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push @$cmd, '-m', "size=${static_memory},slots=255,maxmem=${MAX_MEM}M";
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} else {
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$static_memory = $memory;
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push @$cmd, '-m', $static_memory;
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}
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die "numa needs to be enabled to use hugepages" if $conf->{hugepages} && !$conf->{numa};
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die "Memory hotplug does not work in combination with virtio-fs.\n"
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if $hotplug && $virtiofs_enabled;
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if ($conf->{numa}) {
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my $numa_totalmemory = undef;
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for (my $i = 0; $i < $MAX_NUMA; $i++) {
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next if !$conf->{"numa$i"};
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my $numa = parse_numa($conf->{"numa$i"});
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next if !$numa;
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# memory
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die "missing NUMA node$i memory value\n" if !$numa->{memory};
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my $numa_memory = $numa->{memory};
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$numa_totalmemory += $numa_memory;
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my $memdev = $virtiofs_enabled ? "virtiofs-mem$i" : "ram-node$i";
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my $mem_object = print_mem_object($conf, $memdev, $numa_memory);
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# cpus
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my $cpulists = $numa->{cpus};
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die "missing NUMA node$i cpus\n" if !defined($cpulists);
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my $cpus = join(
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',cpus=',
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map {
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my ($start, $end) = @$_;
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defined($end) ? "$start-$end" : $start
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} @$cpulists,
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);
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# hostnodes
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my $hostnodelists = $numa->{hostnodes};
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if (defined($hostnodelists)) {
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my $hostnodes = print_numa_hostnodes($hostnodelists);
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# policy - note that the value 'default' is not exposed, because it can't be used in
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# combination with host-nodes:
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# > kvm: host-nodes must be empty for policy default, or you should explicitly
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# > specify a policy other than default
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my $policy = $numa->{policy};
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die "you need to define a policy for hostnode $hostnodes\n" if !$policy;
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$mem_object .= ",host-nodes=$hostnodes,policy=$policy";
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} else {
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die "numa hostnodes need to be defined to use hugepages" if $conf->{hugepages};
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}
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push @$cmd, '-object', $mem_object;
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push @$cmd, '-numa', "node,nodeid=$i,cpus=$cpus,memdev=$memdev";
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}
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die "total memory for NUMA nodes must be equal to vm static memory\n"
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if $numa_totalmemory && $numa_totalmemory != $static_memory;
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#if no custom tology, we split memory and cores across numa nodes
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if (!$numa_totalmemory) {
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my $numa_memory = ($static_memory / $sockets);
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for (my $i = 0; $i < $sockets; $i++) {
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die "host NUMA node$i doesn't exist\n"
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if !host_numanode_exists($i) && $conf->{hugepages};
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my $cpus = ($cores * $i);
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$cpus .= "-" . ($cpus + $cores - 1) if $cores > 1;
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my $memdev = $virtiofs_enabled ? "virtiofs-mem$i" : "ram-node$i";
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my $mem_object = print_mem_object($conf, $memdev, $numa_memory);
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push @$cmd, '-object', $mem_object;
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push @$cmd, '-numa', "node,nodeid=$i,cpus=$cpus,memdev=$memdev";
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}
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}
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} elsif ($virtiofs_enabled) {
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# kvm: '-machine memory-backend' and '-numa memdev' properties are mutually exclusive
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push @$cmd, '-object',
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'memory-backend-memfd,id=virtiofs-mem' . ",size=$conf->{memory}M,share=on";
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push @$machine_flags, 'memory-backend=virtiofs-mem';
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}
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if ($hotplug) {
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foreach_dimm(
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$conf,
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$vmid,
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$memory,
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$static_memory,
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sub {
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my ($conf, $vmid, $name, $dimm_size, $numanode, $current_size, $memory) = @_;
|
|
|
|
my $mem_object = print_mem_object($conf, "mem-$name", $dimm_size);
|
|
|
|
push @$cmd, "-object", $mem_object;
|
|
push @$cmd, "-device", "pc-dimm,id=$name,memdev=mem-$name,node=$numanode";
|
|
|
|
die "memory size ($memory) must be aligned to $dimm_size for hotplugging\n"
|
|
if $current_size > $memory;
|
|
},
|
|
);
|
|
}
|
|
}
|
|
|
|
sub print_mem_object {
|
|
my ($conf, $id, $size) = @_;
|
|
|
|
if ($conf->{hugepages}) {
|
|
|
|
my $hugepages_size = hugepages_size($conf, $size);
|
|
my $path = hugepages_mount_path($hugepages_size);
|
|
|
|
return "memory-backend-file,id=$id,size=${size}M,mem-path=$path,share=on,prealloc=yes";
|
|
} elsif ($id =~ m/^virtiofs-mem/) {
|
|
return "memory-backend-memfd,id=$id,size=${size}M,share=on";
|
|
} else {
|
|
return "memory-backend-ram,id=$id,size=${size}M";
|
|
}
|
|
|
|
}
|
|
|
|
sub print_numa_hostnodes {
|
|
my ($hostnodelists) = @_;
|
|
|
|
my $hostnodes;
|
|
foreach my $hostnoderange (@$hostnodelists) {
|
|
my ($start, $end) = @$hostnoderange;
|
|
$hostnodes .= ',' if $hostnodes;
|
|
$hostnodes .= $start;
|
|
$hostnodes .= "-$end" if defined($end);
|
|
$end //= $start;
|
|
for (my $i = $start; $i <= $end; ++$i) {
|
|
die "host NUMA node$i doesn't exist\n" if !host_numanode_exists($i);
|
|
}
|
|
}
|
|
return $hostnodes;
|
|
}
|
|
|
|
sub hugepages_mount {
|
|
|
|
my $mountdata = PVE::ProcFSTools::parse_proc_mounts();
|
|
|
|
foreach my $size (qw(2048 1048576)) {
|
|
next if (!-d "/sys/kernel/mm/hugepages/hugepages-${size}kB");
|
|
|
|
my $path = "/run/hugepages/kvm/${size}kB";
|
|
|
|
my $found = grep {
|
|
$_->[2] =~ /^hugetlbfs/
|
|
&& $_->[1] eq $path
|
|
} @$mountdata;
|
|
|
|
if (!$found) {
|
|
|
|
File::Path::make_path($path) if (!-d $path);
|
|
my $cmd =
|
|
['/bin/mount', '-t', 'hugetlbfs', '-o', "pagesize=${size}k", 'hugetlbfs', $path];
|
|
run_command($cmd, errmsg => "hugepage mount error");
|
|
}
|
|
}
|
|
}
|
|
|
|
sub hugepages_mount_path {
|
|
my ($size) = @_;
|
|
|
|
$size = $size * 1024;
|
|
return "/run/hugepages/kvm/${size}kB";
|
|
|
|
}
|
|
|
|
sub hugepages_nr {
|
|
my ($size, $hugepages_size) = @_;
|
|
|
|
return $size / $hugepages_size;
|
|
}
|
|
|
|
sub hugepages_chunk_size_supported {
|
|
my ($size) = @_;
|
|
|
|
return -d "/sys/kernel/mm/hugepages/hugepages-" . ($size * 1024) . "kB";
|
|
}
|
|
|
|
sub hugepages_size {
|
|
my ($conf, $size) = @_;
|
|
die "hugepages option is not enabled" if !$conf->{hugepages};
|
|
die "memory size '$size' is not a positive even integer; cannot use for hugepages\n"
|
|
if $size <= 0 || $size & 1;
|
|
|
|
die "your system doesn't support hugepages\n"
|
|
if !hugepages_chunk_size_supported(2) && !hugepages_chunk_size_supported(1024);
|
|
|
|
if ($conf->{hugepages} eq 'any') {
|
|
|
|
# try to use 1GB if available && memory size is matching
|
|
if (hugepages_chunk_size_supported(1024) && ($size & 1023) == 0) {
|
|
return 1024;
|
|
} elsif (hugepages_chunk_size_supported(2)) {
|
|
return 2;
|
|
} else {
|
|
die
|
|
"host only supports 1024 GB hugepages, but requested size '$size' is not a multiple of 1024 MB\n";
|
|
}
|
|
} else {
|
|
|
|
my $hugepagesize = $conf->{hugepages};
|
|
|
|
if (!hugepages_chunk_size_supported($hugepagesize)) {
|
|
die "your system doesn't support hugepages of $hugepagesize MB\n";
|
|
} elsif (($size % $hugepagesize) != 0) {
|
|
die
|
|
"Memory size $size is not a multiple of the requested hugepages size $hugepagesize\n";
|
|
}
|
|
|
|
return $hugepagesize;
|
|
}
|
|
}
|
|
|
|
sub hugepages_topology {
|
|
my ($conf, $hotplug) = @_;
|
|
|
|
my $hugepages_topology = {};
|
|
|
|
return if !$conf->{numa};
|
|
|
|
my $memory = get_current_memory($conf->{memory});
|
|
my $static_memory = 0;
|
|
my $sockets = $conf->{sockets} || 1;
|
|
my $numa_custom_topology = undef;
|
|
|
|
if ($hotplug) {
|
|
$static_memory = $STATICMEM;
|
|
$static_memory = $static_memory * $sockets
|
|
if ($conf->{hugepages} && $conf->{hugepages} == 1024);
|
|
} else {
|
|
$static_memory = $memory;
|
|
}
|
|
|
|
#custom numa topology
|
|
for (my $i = 0; $i < $MAX_NUMA; $i++) {
|
|
next if !$conf->{"numa$i"};
|
|
my $numa = parse_numa($conf->{"numa$i"});
|
|
next if !$numa;
|
|
|
|
$numa_custom_topology = 1;
|
|
my $numa_memory = $numa->{memory};
|
|
my $hostnodelists = $numa->{hostnodes};
|
|
my $hostnodes = print_numa_hostnodes($hostnodelists);
|
|
|
|
die "more than 1 hostnode value in numa node is not supported when hugepages are enabled"
|
|
if $hostnodes !~ m/^(\d)$/;
|
|
my $hugepages_size = hugepages_size($conf, $numa_memory);
|
|
$hugepages_topology->{$hugepages_size}->{$hostnodes} +=
|
|
hugepages_nr($numa_memory, $hugepages_size);
|
|
|
|
}
|
|
|
|
#if no custom numa tology, we split memory and cores across numa nodes
|
|
if (!$numa_custom_topology) {
|
|
|
|
my $numa_memory = ($static_memory / $sockets);
|
|
|
|
for (my $i = 0; $i < $sockets; $i++) {
|
|
|
|
my $hugepages_size = hugepages_size($conf, $numa_memory);
|
|
$hugepages_topology->{$hugepages_size}->{$i} +=
|
|
hugepages_nr($numa_memory, $hugepages_size);
|
|
}
|
|
}
|
|
|
|
if ($hotplug) {
|
|
my $numa_hostmap = get_numa_guest_to_host_map($conf);
|
|
|
|
foreach_dimm(
|
|
$conf,
|
|
undef,
|
|
$memory,
|
|
$static_memory,
|
|
sub {
|
|
my ($conf, undef, $name, $dimm_size, $numanode, $current_size, $memory) = @_;
|
|
|
|
$numanode = $numa_hostmap->{$numanode};
|
|
|
|
my $hugepages_size = hugepages_size($conf, $dimm_size);
|
|
$hugepages_topology->{$hugepages_size}->{$numanode} +=
|
|
hugepages_nr($dimm_size, $hugepages_size);
|
|
},
|
|
);
|
|
}
|
|
|
|
return $hugepages_topology;
|
|
}
|
|
|
|
sub hugepages_host_topology {
|
|
|
|
#read host hugepages
|
|
my $hugepages_host_topology = {};
|
|
|
|
dir_glob_foreach(
|
|
"/sys/devices/system/node/",
|
|
'node(\d+)',
|
|
sub {
|
|
my ($nodepath, $numanode) = @_;
|
|
|
|
dir_glob_foreach(
|
|
"/sys/devices/system/node/$nodepath/hugepages/",
|
|
'hugepages\-(\d+)kB',
|
|
sub {
|
|
my ($hugepages_path, $hugepages_size) = @_;
|
|
|
|
$hugepages_size = $hugepages_size / 1024;
|
|
my $hugepages_nr = PVE::Tools::file_read_firstline(
|
|
"/sys/devices/system/node/$nodepath/hugepages/$hugepages_path/nr_hugepages"
|
|
);
|
|
$hugepages_host_topology->{$hugepages_size}->{$numanode} = $hugepages_nr;
|
|
},
|
|
);
|
|
},
|
|
);
|
|
|
|
return $hugepages_host_topology;
|
|
}
|
|
|
|
sub hugepages_allocate {
|
|
my ($hugepages_topology, $hugepages_host_topology) = @_;
|
|
|
|
#allocate new hupages if needed
|
|
foreach my $size (sort keys %$hugepages_topology) {
|
|
|
|
my $nodes = $hugepages_topology->{$size};
|
|
|
|
foreach my $numanode (keys %$nodes) {
|
|
|
|
my $hugepages_size = $size * 1024;
|
|
my $hugepages_requested = $hugepages_topology->{$size}->{$numanode};
|
|
my $path =
|
|
"/sys/devices/system/node/node${numanode}/hugepages/hugepages-${hugepages_size}kB/";
|
|
my $hugepages_free = PVE::Tools::file_read_firstline($path . "free_hugepages");
|
|
my $hugepages_nr = PVE::Tools::file_read_firstline($path . "nr_hugepages");
|
|
|
|
if ($hugepages_requested > $hugepages_free) {
|
|
my $hugepages_needed = $hugepages_requested - $hugepages_free;
|
|
PVE::ProcFSTools::write_proc_entry(
|
|
$path . "nr_hugepages",
|
|
$hugepages_nr + $hugepages_needed,
|
|
);
|
|
#verify that is correctly allocated
|
|
$hugepages_free = PVE::Tools::file_read_firstline($path . "free_hugepages");
|
|
if ($hugepages_free < $hugepages_requested) {
|
|
#rollback to initial host config
|
|
hugepages_reset($hugepages_host_topology);
|
|
die "hugepage allocation failed";
|
|
}
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
sub hugepages_default_nr_hugepages {
|
|
my ($size) = @_;
|
|
|
|
my $cmdline = PVE::Tools::file_read_firstline("/proc/cmdline");
|
|
my $args = PVE::Tools::split_args($cmdline);
|
|
|
|
my $parsed_size = 2; # default is 2M
|
|
|
|
foreach my $arg (@$args) {
|
|
if ($arg eq "hugepagesz=2M") {
|
|
$parsed_size = 2;
|
|
} elsif ($arg eq "hugepagesz=1G") {
|
|
$parsed_size = 1024;
|
|
} elsif ($arg =~ m/^hugepages=(\d+)?$/) {
|
|
if ($parsed_size == $size) {
|
|
return $1;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
sub hugepages_pre_deallocate {
|
|
my ($hugepages_topology) = @_;
|
|
|
|
foreach my $size (sort keys %$hugepages_topology) {
|
|
|
|
my $hugepages_size = $size * 1024;
|
|
my $path = "/sys/kernel/mm/hugepages/hugepages-${hugepages_size}kB/";
|
|
my $hugepages_nr = hugepages_default_nr_hugepages($size);
|
|
PVE::ProcFSTools::write_proc_entry($path . "nr_hugepages", $hugepages_nr);
|
|
}
|
|
}
|
|
|
|
sub hugepages_reset {
|
|
my ($hugepages_topology) = @_;
|
|
|
|
foreach my $size (sort keys %$hugepages_topology) {
|
|
|
|
my $nodes = $hugepages_topology->{$size};
|
|
foreach my $numanode (keys %$nodes) {
|
|
|
|
my $hugepages_nr = $hugepages_topology->{$size}->{$numanode};
|
|
my $hugepages_size = $size * 1024;
|
|
my $path =
|
|
"/sys/devices/system/node/node${numanode}/hugepages/hugepages-${hugepages_size}kB/";
|
|
|
|
PVE::ProcFSTools::write_proc_entry($path . "nr_hugepages", $hugepages_nr);
|
|
}
|
|
}
|
|
}
|
|
|
|
sub hugepages_update_locked {
|
|
my ($code, @param) = @_;
|
|
|
|
my $timeout = 60; #could be long if a lot of hugepages need to be allocated
|
|
|
|
my $lock_filename = "/var/lock/hugepages.lck";
|
|
|
|
my $res = lock_file($lock_filename, $timeout, $code, @param);
|
|
die $@ if $@;
|
|
|
|
return $res;
|
|
}
|
|
1;
|
|
|