[PATCH 00/16] Remove hash page table slot tracking from linux PTE

[Michael Ellerman]

Ram Pai <linuxram at us.ibm.com> writes:

> On Mon, Oct 30, 2017 at 09:04:17AM +1100, Paul Mackerras wrote:
>> On Sat, Oct 28, 2017 at 03:35:32PM -0700, Ram Pai wrote:
>> > 
>> > I like the idea of not tracking the slots at all. It is something the
>> > guest should not be knowing or tracking.
>> 
>> Why do you say that?
>
> 'slot' is a internal mechanism used by the hash table to accelerate
> mapping an address to a hash-page.  If the hash-table implementation
> choose to use a different mechanism to accelerate the mapping, it can't
> because that mechanism is baked into the logic of all the consumers.

The slots are defined in the architecture, so it's entirely fine for
guests to track them.

cheers