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 <stefa...@redhat.com>
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