Re: [Qemu-devel] [PATCH v10 05/17] iotests: Add test 179 to cover write zeroes with unmap

[Eric Blake <eblake@redhat.com>]

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On 04/28/2017 02:28 PM, Max Reitz wrote:
> On 27.04.2017 03:46, Eric Blake wrote:
>> No tests were covering write zeroes with unmap.  Additionally,
>> I needed to prove that my previous patches for correct status
>> reporting and write zeroes optimizations actually had an impact.
>>
>> The test works for cluster_size between 8k and 2M (for smaller
>> sizes, it fails because our allocation patterns are not contiguous
>> with small clusters).
>>
>> Signed-off-by: Eric Blake <eblake@redhat.com>
>>
>> ---
>> v10: drop any changes to v2 files, rewrite test to work with updates
>> earlier in the series, add a blkdebug probe
>> v9: new patch
>> ---
>>  tests/qemu-iotests/179     | 123 +++++++++++++++++++++++++++++++++++++++++++++
>>  tests/qemu-iotests/179.out |  90 +++++++++++++++++++++++++++++++++
>>  tests/qemu-iotests/group   |   1 +
>>  3 files changed, 214 insertions(+)
>>  create mode 100755 tests/qemu-iotests/179
>>  create mode 100644 tests/qemu-iotests/179.out
> 
> Can I convince you to write this test in a different way? I really have
> a hard time following all of the writes and building a mental image of
> how the qcow2 file should look in the end so I can compare it to the map
> output.
> 
> I'd like it better if you would check the qcow2 file after each group of
> write operations, maybe even creating a new image for every such group.
> But even just having more qemu-img map calls (and changing nothing else)
> would help me a lot.

Will do.

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org


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