>>> On 21.05.15 at 15:36, <david.vra...@citrix.com> wrote: > On 21/05/15 11:32, Jan Beulich wrote: >>>>> On 20.05.15 at 17:54, <david.vra...@citrix.com> wrote: >>> @@ -827,9 +828,11 @@ __gnttab_map_grant_ref( >>> if ( (wrc + rdc) == 0 ) >>> err = iommu_map_page(ld, frame, frame, IOMMUF_readable); >>> } >>> + >>> + double_gt_lock(lgt, rgt); >> >> unlock. And with this code path actually used (due to the bug it's >> pretty clear it didn't get exercised in your testing), how does >> performance look like? > > I think it will be no worse than what it was before -- this path already > really sucks (mapcount() loops over 1000s of entries). I don't care > about this path at all.
It's kind of strange that you don't care about this case - afaict we're not getting there by default solely because dom0-strict mode is not currently the default (albeit arguably it should be). Jan _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
