Re: [Qemu-block] [PATCH v3 for-4.2 0/3] block: BDRV_REQ_PREFETCH

[Stefan Hajnoczi]

On Thu, Jul 25, 2019 at 01:05:47PM +0300, Vladimir Sementsov-Ogievskiy wrote:
> 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
> 
> 

Reviewed-by: Stefan Hajnoczi <address@hidden>

signature.asc
Description: PGP signature