On Wed, Oct 21, 2015 at 01:42:26AM +0530, Aneesh Kumar K.V wrote: > Hi, > > This patch series is on top of the series posted at > > https://lists.ozlabs.org/pipermail/linuxppc-dev/2015-October/135299.html > "[PATCH V4 00/31] powerpc/mm: Update page table format for book3s 64". In this > series we remove 4k subpage tracking with 64K config. Instead we do a hash > table lookup to get the slot information of 4k hash ptes. This also allow us > to remove real_pte_t. Side effect of the change is that a specific 4k slot > lookup can result in multiple H_READ hcalls. But that should only impact > when we are using 4K subpages which should be rare. > > NOTE: I only tested this on systemsim. Wanted to get this out to get early > feedback.
I tried this on a quad G5 and it seems to work just fine. On a kernel compile test there was very little difference in speed - I measured about 0.4% slowdown but that may not be statistically significant. This was with 64k pages configured and THP enabled. Paul. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
