Re: UVM patch for PR port-xen/45975

[Chuck Silvers <chuq%chuq.com@localhost>]

On Sat, Feb 18, 2012 at 07:09:48PM +0000, Mindaugas Rasiukevicius wrote:
> Chuck Silvers <chuq%chuq.com@localhost> wrote:
> > On Sat, Feb 18, 2012 at 07:01:24PM +0100, Manuel Bouyer wrote:
> > > >  - the calls to pmap_update() should be moved along with the calls to
> > > >    pmap_kremove().
> > > 
> > > But not all pmap_kremove() are followed by a pmap_update() in the
> > > initial code. Is it a bug ?
> > 
> > yes.  we don't currently defer TLB invalidations from pmap_kremove() on
> > x86 (or probably any platform), but if we start doing that then the
> > pmap_update()s are needed.
> 
> That is not true.  We do defer TLB invalidations/flush to pmap_update() on
> x86 (see pmap_tlb.c mechanism) and MIPS.

ah, so we do.  I guess I'm behind the times.

-Chuck