Subject: Re: [PATCH 4/7] powerpc: Free up four 64K PTE bits in 64K backed HPTE pages

From: Benjamin Herrenschmidt <[email-masked]>
Date: Thu, 14 Sep 2017 18:13:57 +1000

On Fri, 2017-09-08 at 15:44 -0700, Ram Pai wrote:
> The second part of the PTE will hold
> (H_PAGE_F_SECOND|H_PAGE_F_GIX) at bit 60,61,62,63.
> NOTE: None of the bits in the secondary PTE were not used
> by 64k-HPTE backed PTE.

Have you measured the performance impact of this ? The second part of
the PTE being in a different cache line there could be one...

Cheers,
Ben.