Re: [Xen-devel] [PATCH v2 3/5] tools/libxendevicemodel: extract functions and add a compat layer

[Ian Jackson <ian.jackson@xxxxxxxxxxxxx>]

Andrew Cooper writes ("Re: [Xen-devel] [PATCH v2 3/5] tools/libxendevicemodel: 
extract functions and add a compat layer"):
> On 22/02/17 14:37, Ian Jackson wrote:
> > Is the bitmap copied in each dmop call ?
> 
> Yes, and hence...

Oh!

I had assumed that this wouldn't be the case because it would
obviously be slow.

> ... one optimisation I want to do in the future is for the DM to be able
> to make a Read-only mapping of Xens logdirty bitmap, so the bitmap can
> be passed by shared memory rather than memcpy(), because I expect it
> would be rather more efficient during some of the time-sensitive bits of
> live migrate.

Well, err, yes.

(What about the ioreq ring?)

Ian.

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
https://lists.xen.org/xen-devel