In message <1273561463.9209.138.camel at concordia> you wrote:
>
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> On Tue, 2010-05-11 at 16:28 +1000, Michael Neuling wrote:
> > Currently for kexec the PTE tear down on 1TB segment systems normally
> > requires 3 hcalls for each PTE removal. On a machine with 32GB of
> > memory it can take around a minute to remove all the PTEs.
> >=20
> ..
> > - /* TODO: Use bulk call */
>
> ...
> > + /* Read in batches of 4,
> > + * invalidate only valid entries not in the VRMA
> > + * hpte_count will be a multiple of 4
> > + */
> > + for (i =3D 0; i < hpte_count; i +=3D 4) {
> > + lpar_rc =3D plpar_pte_read_4_raw(0, i, (void *)ptes);
> > + if (lpar_rc !=3D H_SUCCESS)
> > + continue;
> > + for (j =3D 0; j < 4; j++){
> > + if ((ptes[j].pteh & HPTE_V_VRMA_MASK) =3D=3D
> > + HPTE_V_VRMA_MASK)
> > + continue;
> > + if (ptes[j].pteh & HPTE_V_VALID)
> > + plpar_pte_remove_raw(0, i + j, 0,
> > + &(ptes[j].pteh), &(ptes[j].ptel));
> > }
>
> Have you tried using the bulk remove call, if none of the HPTEs are for
> the VRMA? Rumour was it was slower/the-same, but that may have been
> apocryphal.
No, I didn't try it.
I think the real solution is to ask FW for a new call to do it all for
us.
Mikey
