Re: [virtio-comment] Re: About custom device counter

[Xuan Zhuo <xuanzhuo@linux.alibaba.com>]

On Mon, 12 Jun 2023 02:25:42 -0400, "Michael S. Tsirkin" <mst@redhat.com> wrote:
> On Mon, Jun 12, 2023 at 02:12:35PM +0800, Xuan Zhuo wrote:
> > We hope to support device custom counter. That is, virtio spec provides a
> > channel for driver and device, and both key and value are provided by device.
> >
> > We discussed this issue earlier, and after some internal practice, I think it is
> > still necessary to discuss this again.
> >
> > It is very important, each cloud vendor will always have some special counters,
> > these counters may not exist in another vendor. At the same time, if we have
> > to discuss it in the spec every time we add a counter, or add a feature, I
> > think it is very inconvenient. Manufacturers may add some new counters at any
> > time based on some new requirements. Some counters may also be removed at any
> > time.
> >
> > Of course I know that doing this might hurt migration. But what I want to say is,
> > why does it affect live migration? These counters we plan to give to users
> > through ethtool -S, and some changes have taken place in the ethtool counters
> > output by users. Does this have any practical impact? Or do we directly use
> > some other output in a way, we can clearly tell the user that these counters
> > may change during the migration process. For example, the driver is migrated
> > to some new devices. These devices support some new counters. I think users
> > should be able to see these new counters. These new counters may be the
> > purpose of the migration.
> >
> > We don't need to support live migration at this point.
> >
> > Thanks.
>
>
> Why not just document the thing?

Device Counter or Device Stat, we discussed this issue earlier,
So I want to slove the problem migration firstly.


Thanks.


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