Re: [libvirt] [PATCH] nodedev: Export NUMA node locality for PCI devices

A PCI device can be associated with a specific NUMA node. Later, when a guest is pinned to one NUMA node the PCI device can be assigned on different NUMA node. This makes DMA transfers travel across nodes and thus results in suboptimal performance. We should expose the NUMA node locality for PCI devices so management applications can make better decisions. Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com&gt; ---

diff --git a/src/node_device/node_device_udev.c b/src/node_device/node_device_udev.c index 9a951d9..8e98ad2 100644 --- a/src/node_device/node_device_udev.c +++ b/src/node_device/node_device_udev.c @@ -493,6 +493,13 @@ static int udevProcessPCI(struct udev_device *device, goto out; } + if (udevGetIntSysfsAttr(device, + "numa_node", + &data->pci_dev.numa_node, + 10) == PROPERTY_ERROR) { + goto out;