[pve-devel] [PATCH 2/2] hugepages: use hostnodes value as numanode for topology

Alexandre DERUMIER aderumier at odiso.com
Fri Jul 29 10:40:37 CEST 2016


>>I don't really see the relation there, why would this restriction apply
>>specifically with hugepages enabled? Or is it just a performance
>>concern?

yes,it's only when hugepages is enabled.

As we reserved hugepages, I really don't known how qemu will try to split memory with

hostnodes=0;1,memory=4096

or

hostnodes=0;2-3,memory=4096


I think it's random, so in this case we should reserved pages on all nodes to be sure.
Seem to be a little be complex to manage.


----- Mail original -----
De: "Wolfgang Bumiller" <w.bumiller at proxmox.com>
À: "aderumier" <aderumier at odiso.com>
Cc: "pve-devel" <pve-devel at pve.proxmox.com>
Envoyé: Vendredi 29 Juillet 2016 09:48:04
Objet: Re: [pve-devel] [PATCH 2/2] hugepages: use hostnodes value as numanode for topology

On Fri, Jul 29, 2016 at 05:17:34AM +0200, Alexandre Derumier wrote: 
> also disallow more than 1 hostnode value 

I don't really see the relation there, why would this restriction apply 
specifically with hugepages enabled? Or is it just a performance 
concern? 

Patch seems fine otherwise. 

> 
> Signed-off-by: Alexandre Derumier <aderumier at odiso.com> 
> --- 
> PVE/QemuServer/Memory.pm | 35 +++++++++++++++++++++++------------ 
> 1 file changed, 23 insertions(+), 12 deletions(-) 
> 
> diff --git a/PVE/QemuServer/Memory.pm b/PVE/QemuServer/Memory.pm 
> index 58c7217..37f285a 100644 
> --- a/PVE/QemuServer/Memory.pm 
> +++ b/PVE/QemuServer/Memory.pm 
> @@ -230,17 +230,8 @@ sub config { 
> # hostnodes 
> my $hostnodelists = $numa->{hostnodes}; 
> if (defined($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$i doesn't exist\n" if ! -d "/sys/devices/system/node/node$i/"; 
> - } 
> - } 
> + 
> + my $hostnodes = print_numa_hostnodes($hostnodelists); 
> 
> # policy 
> my $policy = $numa->{policy}; 
> @@ -311,6 +302,23 @@ sub print_mem_object { 
> 
> } 
> 
> +sub print_numa_hostnodes { 
> + my ($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$i doesn't exist\n" if ! -d "/sys/devices/system/node/node$i/"; 
> + } 
> + } 
> + return $hostnodes; 
> +} 
> + 
> sub hugepages_mount { 
> 
> my $mountdata = PVE::ProcFSTools::parse_proc_mounts(); 
> @@ -406,9 +414,12 @@ sub hugepages_topology { 
> 
> $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}->{$i} += hugepages_nr($numa_memory, $hugepages_size); 
> + $hugepages_topology->{$hugepages_size}->{$hostnodes} += hugepages_nr($numa_memory, $hugepages_size); 
> 
> } 
> 
> -- 
> 2.1.4 
> 
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