[pve-devel] [PATCH qemu-server] qemu options: add memory_allocator

[Alexandre Derumier]

Add optional memory_allocator.

Default is glibc malloc, tcmalloc is available to improve performance
of ceph librbd.

Signed-off-by: Alexandre Derumier <aderumier at odiso.com>
---
 PVE/QemuServer.pm | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/PVE/QemuServer.pm b/PVE/QemuServer.pm
index 40be44d..8de6c82 100644
--- a/PVE/QemuServer.pm
+++ b/PVE/QemuServer.pm
@@ -723,6 +723,14 @@ EODESCR
 	description => "List of host cores used to execute guest processes, for example: 0,5,8-11",
 	optional => 1,
     },
+    memory_allocator => {
+	optional => 1,
+	type => 'string',
+	enum => [ qw(glibc tcmalloc) ],
+	default => 'glibc',
+	description => "Configure qemu process memory allocator. tcmalloc improve performance of ceph librbd",
+	optional => 1,
+    },
 };
 
 my $cicustom_fmt = {
@@ -5909,6 +5917,10 @@ sub vm_start_nolock {
 
     my $run_qemu = sub {
 	PVE::Tools::run_fork sub {
+
+	    $ENV{LD_PRELOAD} = "/usr/lib/x86_64-linux-gnu/libtcmalloc.so.4"
+		if $conf->{memory_allocator} && $conf->{memory_allocator} eq 'tcmalloc';
+
 	    PVE::Systemd::enter_systemd_scope($vmid, "Proxmox VE VM $vmid", %systemd_properties);
 
 	    my $tpmpid;
-- 
2.30.2