> On Aug 18, 2019, at 8:58 PM, Daniel Axtens wrote:
>
>>> Each page of shadow memory represent 8 pages of real memory. Could we use
>>> page_ref to count how many pieces of a shadow page are used so that we can
>>> free it when the ref count decreases to 0.
>
> I'm not sure how much of a differen
On Fri, Aug 16, 2019 at 10:41:00AM -0700, Andy Lutomirski wrote:
> On Fri, Aug 16, 2019 at 10:08 AM Mark Rutland wrote:
> >
> > Hi Christophe,
> >
> > On Fri, Aug 16, 2019 at 09:47:00AM +0200, Christophe Leroy wrote:
> > > Le 15/08/2019 à 02:16, Daniel Axtens a écrit :
> > > > Hook into vmalloc an
>> > Instead, share backing space across multiple mappings. Allocate
>> > a backing page the first time a mapping in vmalloc space uses a
>> > particular page of the shadow region. Keep this page around
>> > regardless of whether the mapping is later freed - in the mean time
>> > the page could h
On Fri, Aug 16, 2019 at 10:08 AM Mark Rutland wrote:
>
> Hi Christophe,
>
> On Fri, Aug 16, 2019 at 09:47:00AM +0200, Christophe Leroy wrote:
> > Le 15/08/2019 à 02:16, Daniel Axtens a écrit :
> > > Hook into vmalloc and vmap, and dynamically allocate real shadow
> > > memory to back the mappings.
Hi Christophe,
On Fri, Aug 16, 2019 at 09:47:00AM +0200, Christophe Leroy wrote:
> Le 15/08/2019 à 02:16, Daniel Axtens a écrit :
> > Hook into vmalloc and vmap, and dynamically allocate real shadow
> > memory to back the mappings.
> >
> > Most mappings in vmalloc space are small, requiring less
Le 15/08/2019 à 02:16, Daniel Axtens a écrit :
Hook into vmalloc and vmap, and dynamically allocate real shadow
memory to back the mappings.
Most mappings in vmalloc space are small, requiring less than a full
page of shadow space. Allocating a full shadow page per mapping would
therefore be
