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[Qemu-devel] [RFC PATCH 00/11] speedup vring processing with MemoryRegio
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [RFC PATCH 00/11] speedup vring processing with MemoryRegionCaches |
Date: |
Mon, 12 Dec 2016 12:18:46 +0100 |
It is known that virtio's usage of ld_*_phys and st_*_phys functions
wastes time in address_space_translate, visiting the
AddressSpaceDispatch's radix tree.
This series introduces a small cache that changes these functions
to a simple range check and memory access. The effect is a bit
underwhelming, because the improvement is only 1-2Kiops/second.
Nevertheless I'm throwing out the patches so that for example they
can be tested on s390.
Things to fix: handle address_space_cache_init failures
in virtio_init_region_cache. Also, once virtio breaks free of
address_space_memoory, we'll need to handle invalidation in IOMMU regions.
For the latter, maybe it's worth introducing a new abstraction that
is higher-level than MemoryListener and covers both regular and IOMMU
memory regions.
Paolo
Paolo Bonzini (11):
exec: optimize remaining address_space_* cases
exec: introduce memory_ldst.inc.c
exec: introduce address_space_extend_translation
exec: introduce MemoryRegionCache
virtio: make virtio_should_notify static
virtio: add virtio_*_phys_cached
virtio: use address_space_map/unmap to access descriptors
virtio: use MemoryRegionCache to access descriptors
virtio: add MemoryListener to cache ring translations
virtio: use VRingMemoryRegionCaches for descriptor ring
virtio: use VRingMemoryRegionCaches for avail and used rings
exec.c | 687 +++++-------------------------------
hw/net/virtio-net.c | 14 +-
hw/virtio/virtio.c | 322 +++++++++++++----
include/exec/cpu-all.h | 23 ++
include/exec/cpu-common.h | 15 -
include/exec/memory.h | 166 +++++++++
include/hw/virtio/virtio-access.h | 52 +++
include/hw/virtio/virtio.h | 2 +-
include/qemu/typedefs.h | 1 +
memory_ldst.inc.c | 709 ++++++++++++++++++++++++++++++++++++++
10 files changed, 1316 insertions(+), 675 deletions(-)
create mode 100644 memory_ldst.inc.c
--
1.8.3.1
- [Qemu-devel] [RFC PATCH 00/11] speedup vring processing with MemoryRegionCaches,
Paolo Bonzini <=
- [Qemu-devel] [PATCH 06/11] virtio: add virtio_*_phys_cached, Paolo Bonzini, 2016/12/12
- [Qemu-devel] [PATCH 03/11] exec: introduce address_space_extend_translation, Paolo Bonzini, 2016/12/12
- [Qemu-devel] [PATCH 05/11] virtio: make virtio_should_notify static, Paolo Bonzini, 2016/12/12
- [Qemu-devel] [PATCH 04/11] exec: introduce MemoryRegionCache, Paolo Bonzini, 2016/12/12
- [Qemu-devel] [PATCH 07/11] virtio: use address_space_map/unmap to access descriptors, Paolo Bonzini, 2016/12/12