309750fad5
Currently we allocate one vhost log per vhost device. This is sub optimal when: - Guest has several device with vhost as backend - Guest has multiqueue devices In the above cases, we can avoid the memory allocation by sharing a single vhost log among all the vhost devices. This is done through: - Introducing a new vhost_log structure with refcnt inside. - Using a global pointer to vhost_log structure that will be used. And introduce helper to get the log with expected log size and helper to - drop the refcnt to the old log. - Each vhost device still keep track of a pointer to the log that was used. With above, if no resize happens, all vhost device will share a single vhost log. During resize, a new vhost_log structure will be allocated and made for the global pointer. And each vhost devices will drop the refcnt to the old log. Tested by doing scp during migration for a 2 queues virtio-net-pci. Cc: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Jason Wang <jasowang@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> |
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| .. | ||
| acpi | ||
| arm | ||
| audio | ||
| block | ||
| char | ||
| cpu | ||
| cris | ||
| i2c | ||
| i386 | ||
| input | ||
| intc | ||
| ipack | ||
| isa | ||
| kvm | ||
| lm32 | ||
| m68k | ||
| mem | ||
| mips | ||
| misc | ||
| net | ||
| nvram | ||
| pci | ||
| pci-host | ||
| ppc | ||
| s390x | ||
| scsi | ||
| sh4 | ||
| sparc | ||
| timer | ||
| tricore | ||
| unicore32 | ||
| usb | ||
| vfio | ||
| virtio | ||
| xen | ||
| boards.h | ||
| bt.h | ||
| compat.h | ||
| devices.h | ||
| elf_ops.h | ||
| empty_slot.h | ||
| fw-path-provider.h | ||
| hotplug.h | ||
| hw.h | ||
| ide.h | ||
| irq.h | ||
| loader.h | ||
| nmi.h | ||
| pcmcia.h | ||
| platform-bus.h | ||
| ptimer.h | ||
| qdev-core.h | ||
| qdev-dma.h | ||
| qdev-properties.h | ||
| qdev.h | ||
| sd.h | ||
| ssi.h | ||
| stream.h | ||
| sysbus.h | ||
| usb.h | ||