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Re: [Qemu-devel] [PATCH v4 0/27] write/create for Parallels images with

From: Denis V. Lunev
Subject: Re: [Qemu-devel] [PATCH v4 0/27] write/create for Parallels images with reasonable performance
Date: Fri, 8 May 2015 20:39:56 +0300
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:31.0) Gecko/20100101 Thunderbird/31.6.0

On 28/04/15 10:46, Denis V. Lunev wrote:
This patchset provides an ability to create of/write to Parallels
images and some testing of the new code. Readings and writings are
optimized out and I expect the same or slightly better performance
as qcow2.

Changes from v4:
- parallels format driver marked as bdrv_has_zero_init_1
- added missed unlocks to parallels_co_readv/writev on error path, locking
   is shortened and simplified
- changed test number for created images
- added check for bdrv_has_zero_init() and availability of bdrv_truncate()
   in parallels_open() and proper error handling in alloc_cluster
- some patch comments are improved

Changes from v3:
- fixed checkpatch warnings even in just moved code. I am tired of them
- fixed contingency check in patch 18

Changes from v2:
- read performance is almost doubled (up to 360 Mb/sec), write performance
   is improved by 15-20%
- bat caching approach changed completely. bat_bitmap now contains the data
   in on-disk format, which allows to use this data for metadata cache
- incorrect close detection code is added (inuse field in the header)
- very basic check consistency code added

Changes from v1:
- patches 13-19 added, which boosts performance from 800 KiB/sec to
   near native performance

Signed-off-by: Denis V. Lunev <address@hidden>
CC: Roman Kagan <address@hidden>
CC: Kevin Wolf <address@hidden>
CC: Stefan Hajnoczi <address@hidden>


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