On 22/5/2019 11:40 PM, Max Reitz wrote:
> On 16.05.19 16:27, Anton Nefedov wrote:
>> If COW areas of the newly allocated clusters are zeroes on the backing
>> image, efficient bdrv_write_zeroes(flags=BDRV_REQ_NO_FALLBACK) can be
>> used on the whole cluster instead of writing explicit zero buffers
On 16.05.19 16:27, Anton Nefedov wrote:
> If COW areas of the newly allocated clusters are zeroes on the backing
> image, efficient bdrv_write_zeroes(flags=BDRV_REQ_NO_FALLBACK) can be
> used on the whole cluster instead of writing explicit zero buffers later
> in perform_cow().
>
> iotest 060:
>
On Thu 16 May 2019 04:27:49 PM CEST, Anton Nefedov wrote:
> If COW areas of the newly allocated clusters are zeroes on the backing
> image, efficient bdrv_write_zeroes(flags=BDRV_REQ_NO_FALLBACK) can be
> used on the whole cluster instead of writing explicit zero buffers later
> in perform_cow().
16.05.2019 17:27, Anton Nefedov wrote:
> If COW areas of the newly allocated clusters are zeroes on the backing
> image, efficient bdrv_write_zeroes(flags=BDRV_REQ_NO_FALLBACK) can be
> used on the whole cluster instead of writing explicit zero buffers later
> in perform_cow().
>
> iotest 060:
>
If COW areas of the newly allocated clusters are zeroes on the backing
image, efficient bdrv_write_zeroes(flags=BDRV_REQ_NO_FALLBACK) can be
used on the whole cluster instead of writing explicit zero buffers later
in perform_cow().
iotest 060:
write to the discarded cluster does not trigger COW
