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Re: [Qemu-block] [PATCH v4 0/5] qcow2: async handling of fragmented io

From: Max Reitz
Subject: Re: [Qemu-block] [PATCH v4 0/5] qcow2: async handling of fragmented io
Date: Fri, 13 Sep 2019 10:58:35 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0

On 16.08.19 17:30, Vladimir Sementsov-Ogievskiy wrote:
> Hi all!
> Here is an asynchronous scheme for handling fragmented qcow2
> reads and writes. Both qcow2 read and write functions loops through
> sequential portions of data. The series aim it to parallelize these
> loops iterations.
> It improves performance for fragmented qcow2 images, I've tested it
> as described below.

Thanks, I’ve changed two things:
- Replaced assert((x & (BDRV_SECTOR_SIZE - 1)) == 0) by
  assert(QEMU_IS_ALIGNED(x, BDRV_SECTOR_SIZE)) in patch 3 (conflict with
  “block: Use QEMU_IS_ALIGNED”), and
- Replaced the remaining instance of “qcow2_co_do_pwritev()” by
  “qcow2_co_pwritev_task()” in a comment in patch 4

and applied the series to my block branch:



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