On 8 September 2017 at 19:16, Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> wrote: > If we know that we will completely fill a pagetable (i.e. we are > inserting a complete set of 512 pages), we can skip prefilling that PT > with scratch entries. If we have to abort the insertion prior to writing > the real entries, we will teardown the pagetable and remove it from the > page directory (so that we will restart the allocation next time). > > We could do similar tricks for the PD and PDP, but the likelihood of a > single insertion covering the entire 512 entries diminishes, as do the > cycle savings. The saving are even greater (relatively) when we are > preallocating page tables for huge pages, as then we never need to fill > the page table. > > Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > Cc: Matthew Auld <matthew.auld@xxxxxxxxx> > Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx> Reviewed-by: Matthew Auld <matthew.auld@xxxxxxxxx> _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
