Re: [Qemu-devel] [PATCH v4 08/15] tests: Add test code for meta bitmap

[Fam Zheng <famz@redhat.com>]

On Fri, 03/11 15:58, Max Reitz wrote:
> > +    /* Test "unset" -> "set" will update meta */
> > +    hbitmap_set(data->hb, start, count);
> > +    hbitmap_check_meta(data, check_start, check_count);
> > +
> > +    /* Test "set" -> "set" will not update meta */
> > +    hbitmap_reset_all(data->meta);
> > +    hbitmap_set(data->hb, start, count);
> > +    hbitmap_check_meta(data, 0, 0);
> 
> Well, but if you'd do an hbitmap_set(data->hb, start, count + 1), then
> it would update meta, right?

Yes.

> 
> I forgot to mention in my reply to patch 7 that the check whether
> anything in the range passed to hbitmap_set() has been changed in order
> to determine whether all of that range should be set in the meta bitmap
> seemed a bit excessive. I don't think this will hurt anyone, but still.

It is. It has been on my list to optimize the unnecessary meta update away but
I haven't done that yet.

Fam

> 
> (So this is not a NACK, just a question.)
> 
> Max
>