On Tue 18 Dec 2018 08:57:45 AM CET, Anton Nefedov wrote:
> @@ -2126,24 +2202,33 @@ static coroutine_fn int
> qcow2_co_pwritev(BlockDriverState *bs, uint64_t offset,
> goto fail;
> }
>
> +qemu_co_mutex_unlock(>lock);
> +
> +ret = handle_alloc_space(bs,
24.12.2018 11:21, Anton Nefedov wrote:
> On 21/12/2018 7:16 PM, Vladimir Sementsov-Ogievskiy wrote:
>> 18.12.2018 10:57, Anton Nefedov wrote:
>>> If COW areas of the newly allocated clusters are zeroes on the backing
>>> image,
>>> efficient bdrv_write_zeroes(flags=BDRV_REQ_ALLOCATE) can be used
On 21/12/2018 7:16 PM, Vladimir Sementsov-Ogievskiy wrote:
> 18.12.2018 10:57, Anton Nefedov wrote:
>> If COW areas of the newly allocated clusters are zeroes on the backing image,
>> efficient bdrv_write_zeroes(flags=BDRV_REQ_ALLOCATE) can be used on the whole
>> cluster instead of writing
18.12.2018 10:57, Anton Nefedov wrote:
> If COW areas of the newly allocated clusters are zeroes on the backing image,
> efficient bdrv_write_zeroes(flags=BDRV_REQ_ALLOCATE) can be used on the whole
> cluster instead of writing explicit zero buffers later in perform_cow().
>
> iotest 060:
> write
If COW areas of the newly allocated clusters are zeroes on the backing image,
efficient bdrv_write_zeroes(flags=BDRV_REQ_ALLOCATE) 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
