Re: [PATCH 0/4] Remove duplicated stats definitions for debugfs

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On Mon, Jun 14, 2021 at 4:53 AM Paolo Bonzini <pbonzini@xxxxxxxxxx> wrote:
>
> On 14/06/21 04:53, Jing Zhang wrote:
> > This is a follow-up patchset to binary stats interface patchset as below:
> > https://lore.kernel.org/kvm/20210611124624.1404010-1-jingzhangos@xxxxxxxxxx
> >
> > This patchset contains a commit to fix some missing stats and add static
> > check to make sure we have the right number of stats descriptors and add an
> > 'offset' field in stats descriptor to make sure the or order of stats
> > descriptors is not relevant to the order of stats in vm/vcpu stats
> > structure. This will totally avoid the possibility of missing stats and
> > mismatched stats definitions.
> >
> > The binary stats interface defines stats in another array of descriptors,
> > while the original stats debugfs interface uses array of kvm_stats_debugfs
> > item. To remove the duplicated stats definition, this patchset would
> > utilize only the stats descriptors to provide stats information to debugfs
> > interface. This patchset adds a 'mode' flag to support the read/write mode
> > of stats, which can be used to indicate the file permission of debugfs
> > stats files. It removes the usage of kvm_stats_debugfs_item and all the
> > debugfs_entries defined in all archs.
> >
> > The patch also fixes an issue that read only stats could be cleared in
> > global level, though not permitted in VM level in the original debugfs
> > code.
>
> Thanks for putting this together quickly.  I think we can drop the mode,
> see the suggestion in patch 2.
>
> It's probably best to fold the v8 for the stats functionality, these
> patches (squashed appropriately) and Fuad's remars in a single posting.
>   But I'm quite confident that it can make it in 5.14.
>
> Paolo
>
Thanks. Will drop the mode, squash stats functionality with v8 and fold them
in another single posting (v9).

Jing



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