From: Eric Blake <eblake@redhat.com>
To: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>,
qemu-devel@nongnu.org, qemu-block@nongnu.org
Cc: kwolf@redhat.com, fam@euphon.net, mreitz@redhat.com,
stefanha@redhat.com, den@openvz.org, jsnow@redhat.com
Subject: Re: [Qemu-devel] [PATCH 0/3] block: blk_co_pcache
Date: Thu, 6 Jun 2019 08:55:58 -0500 [thread overview]
Message-ID: <f92b274d-1949-3afa-7353-d3e3d67ae705@redhat.com> (raw)
In-Reply-To: <20190606134814.123689-1-vsementsov@virtuozzo.com>
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On 6/6/19 8:48 AM, Vladimir Sementsov-Ogievskiy wrote:
> Hi all!
>
> Here is small new io API: blk_co_pcache, which 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
I'd really like to see qemu-io gain access to calling this command, so
that we can add iotests coverage of this new feature. Note that the
in-development libnbd
(https://github.com/libguestfs/libnbd/commits/master) is also usable as
an NBD client that can drive NBD_CMD_CACHE, although it's still new
enough that we probably don't want to rely on it being available yet.
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3226
Virtualization: qemu.org | libvirt.org
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next prev parent reply other threads:[~2019-06-06 13:58 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-06 13:48 [Qemu-devel] [PATCH 0/3] block: blk_co_pcache Vladimir Sementsov-Ogievskiy
2019-06-06 13:48 ` [Qemu-devel] [PATCH 1/3] block: implement blk_co_pcache Vladimir Sementsov-Ogievskiy
2019-06-06 13:48 ` [Qemu-devel] [PATCH 2/3] block/stream: use blk_co_pcache Vladimir Sementsov-Ogievskiy
2019-06-06 13:48 ` [Qemu-devel] [PATCH 3/3] nbd: improve CMD_CACHE: " Vladimir Sementsov-Ogievskiy
2019-06-06 13:55 ` Eric Blake [this message]
2019-06-06 14:07 ` [Qemu-devel] [PATCH 0/3] block: blk_co_pcache Vladimir Sementsov-Ogievskiy
2019-06-17 11:20 ` Vladimir Sementsov-Ogievskiy
2019-06-17 12:09 ` Kevin Wolf
2019-06-17 12:32 ` Vladimir Sementsov-Ogievskiy
2019-06-17 13:09 ` Eric Blake
2019-06-17 13:20 ` Kevin Wolf
2019-06-18 7:38 ` Vladimir Sementsov-Ogievskiy
2019-06-18 8:23 ` Kevin Wolf
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