Re: [Qemu-devel] [PATCH 0/4] multiwrite patches for 2.2

[Kevin Wolf <kwolf@redhat.com>]

Am 21.10.2014 um 11:07 hat Max Reitz geschrieben:
> On 2014-10-21 at 10:01, Peter Lieven wrote:
> >On 21.10.2014 09:06, Max Reitz wrote:
> >>On 2014-10-20 at 22:48, Peter Lieven wrote:
> >>>Am 20.10.2014 um 17:56 schrieb Max Reitz <mreitz@redhat.com>:
> >>>
> >>>>On 20.10.2014 at 16:35, Peter Lieven wrote:
> >>>>>This adds some preparing patches for upcoming multiwrite
> >>>>>modifications.
> >>>>>I will leave the dangerous patches for after 2.2 release.
> >>>>>
> >>>>>Peter Lieven (4):
> >>>>>   block: add accounting for merged requests
> >>>>>   block: introduce bdrv_runtime_opts
> >>>>>   block: add a knob to disable multiwrite_merge
> >>>>>   hw/virtio-blk: add a constant for max number of merged requests
> >>>>In addition, I'd like a test for this (just the parameter
> >>>>would be enough). But I don't object to this series without
> >>>>it.
> >>>Thanks for your comments. I will respin tomorrow.
> >>>
> >>>What exactly would you like to check in a test?
> >>
> >>Just give the parameter and test the query-block against it. I'd
> >>test the default, switching it on, off and maybe even specify it
> >>for a non-root BDS to see whether that works.
> >
> >It seems it is currently not visible in query-block which
> >paramters are set to e.g. file. If I specifiy -drive
> >file.write_merging=off its accepted but not displayed. Any ideas?
> 
> Hm, I forgot that query-block only gives you the root BDS. Too bad.
> Then we cannot test that. We probably want to have a QMP command to
> query the whole BDS graph some time, but it isn't there yet.

Does query-named-block-nodes help in this specific case?

Kevin