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

[Vladimir Sementsov-Ogievskiy]

29.07.2019 18:00, Stefan Hajnoczi wrote:
> 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>
> 

Thank you for reviewing!

-- 
Best regards,
Vladimir