Re: [Xen-ia64-devel] [RFC] grant table API clean up and performancetuning memo

[Tristan Gingold <Tristan.Gingold@xxxxxxxx>]

Le Jeudi 27 Avril 2006 13:18, Isaku Yamahata a écrit :
> On Thu, Apr 27, 2006 at 01:01:53PM +0200, Tristan Gingold wrote:
> > > > But this doesn't work for transfer.
> > >
> > > As you mentioned above, pages used for transfer is allocated
> > > from the slab.
> > > The Linux slab allocater calls constructor/destructor.
> > > It's easy to register pages used for socket buffer to xen/ia64 in order
> > > to track tlb inserts.
> >
> > I think this is too late.
> > A page may have been already inserted before calling the constructor.
> > I think there is a security issue here.
>
> When a domain registers pseudo physicall address, xen/ia64 un-assigns
> a corresponding page, and re-assigns a new page.
> Freeing the unassigned page can be deferred.
Ok, I now better understand  what you mean in the memo.
This is a method to be tested.

Tristan.




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