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[Qemu-devel] [PATCH v3 for-4.2 0/3] block: BDRV_REQ_PREFETCH
From: |
Vladimir Sementsov-Ogievskiy |
Subject: |
[Qemu-devel] [PATCH v3 for-4.2 0/3] block: BDRV_REQ_PREFETCH |
Date: |
Thu, 25 Jul 2019 13:05:47 +0300 |
Hi all!
Here is small new read flag: BDRV_REQ_PREFETCH, which in combination with
BDRV_REQ_COPY_ON_READ does copy-on-read without
extra buffer for read data. This means that only parts that needs COR
will be actually read and only corresponding buffers allocated, no more.
This allows to improve a bit block-stream and NBD_CMD_CACHE
v3: rebase 02 on master, fix commit message of 03.
v2: change interface to be just one flag BDRV_REQ_PREFETCH
v1 was "[PATCH 0/3] block: blk_co_pcache"
https://lists.gnu.org/archive/html/qemu-devel/2019-06/msg01047.html
Vladimir Sementsov-Ogievskiy (3):
block: implement BDRV_REQ_PREFETCH
block/stream: use BDRV_REQ_PREFETCH
nbd: improve CMD_CACHE: use BDRV_REQ_PREFETCH
include/block/block.h | 8 +++++++-
block/io.c | 18 ++++++++++++------
block/stream.c | 20 +++++++-------------
nbd/server.c | 43 +++++++++++++++++++++++++++++++++++--------
4 files changed, 61 insertions(+), 28 deletions(-)
--
2.18.0
- [Qemu-devel] [PATCH v3 for-4.2 0/3] block: BDRV_REQ_PREFETCH,
Vladimir Sementsov-Ogievskiy <=