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[Qemu-devel] [PATCH v3 0/2] block: Handle multiple write requests at onc
From: |
Kevin Wolf |
Subject: |
[Qemu-devel] [PATCH v3 0/2] block: Handle multiple write requests at once |
Date: |
Wed, 9 Sep 2009 17:53:36 +0200 |
virtio often issues multiple requests in a row, but each one independently. If
the block drivers knew all of the requests, they could optimize the way they
handle the requests. See the description of patch 1 for how qcow2 can use this
to avoid unnecessary writes to the disk.
v2:
The simple request merging code isn't qcow2 specific at all. Enable it for all
formats. A cleverer merging policy can later still be implemented in a driver
specific way.
v3:
Handle overlapping requests, add hook for block drivers to merge even more
requests.
Kevin Wolf (2):
Add bdrv_aio_multiwrite
virtio-blk: Use bdrv_aio_multiwrite
block.c | 183 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
block.h | 15 +++++
block_int.h | 6 ++
cutils.c | 25 ++++++++
hw/virtio-blk.c | 50 +++++++++++++---
qemu-common.h | 1 +
6 files changed, 272 insertions(+), 8 deletions(-)