Add a new tuning option with allocator property.
Available values:
- Default is 'system', aka glibc malloc
- tcmalloc (improve performance ceph librbd)
Signed-off-by: Alexandre Derumier <aderum...@odiso.com>
---
PVE/QemuServer.pm | 35 +++++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)
diff --git a/PVE/QemuServer.pm b/PVE/QemuServer.pm
index 40be44d..761ab48 100644
--- a/PVE/QemuServer.pm
+++ b/PVE/QemuServer.pm
@@ -289,6 +289,19 @@ my $meta_info_fmt = {
},
};
+my $tuning_fmt = {
+ allocator => {
+ type => 'string',
+ enum => [ qw(system tcmalloc) ],
+ default => 'system',
+ description => "Override the memory allocator used in QEMU via
LD_PRELOAD.",
+ verbose_description => "Override the memory allocator used in QEMU via
LD_PRELOAD."
+ ." Using tcmalloc might improve performance if ceph librbd is used."
+ ." NOTE: you must install the libtcmalloc-minimal4 package first!",
+ optional => 1,
+ },
+};
+
my $confdesc = {
onboot => {
optional => 1,
@@ -723,6 +736,12 @@ EODESCR
description => "List of host cores used to execute guest processes, for
example: 0,5,8-11",
optional => 1,
},
+ tuning=> {
+ type => 'string',
+ format => $tuning_fmt,
+ description => "Tune some special features.",
+ optional => 1,
+ },
};
my $cicustom_fmt = {
@@ -2192,6 +2211,16 @@ sub parse_rng {
return $res;
}
+sub parse_tuning {
+ my ($value) = @_;
+
+ return if !$value;
+
+ my $res = eval { parse_property_string($tuning_fmt, $value) };
+ warn $@ if $@;
+ return $res;
+}
+
sub parse_meta_info {
my ($value) = @_;
@@ -5909,6 +5938,12 @@ sub vm_start_nolock {
my $run_qemu = sub {
PVE::Tools::run_fork sub {
+
+ my $tuning = $conf->{tuning} ? parse_tuning($conf->{tuning}) :
undef;
+
+ $ENV{LD_PRELOAD} = "/usr/lib/x86_64-linux-gnu/libtcmalloc.so.4"
+ if $tuning && $tuning->{allocator} eq 'tcmalloc';
+
PVE::Systemd::enter_systemd_scope($vmid, "Proxmox VE VM $vmid",
%systemd_properties);
my $tpmpid;
--
2.30.2
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