"Aneesh Kumar K.V" <aneesh.ku...@linux.vnet.ibm.com> writes:
> Paul Mackerras <pau...@samba.org> writes: > >> This patch series modifies the Linux PTE format used on 64-bit Book3S >> processors (i.e. POWER server processors) to make the bits line up >> with the PTE format used in the radix trees defined in PowerISA v3.0. >> This will reduce the amount of further change required to make a >> kernel that can run with either a radix MMU or a hashed page table >> (HPT) MMU. >> >> This also changes the upper levels of the tree to use real addresses >> rather than kernel virtual addresses - that is, we no longer have the >> 0xc000... at the top of each PGD/PUD/PMD entry. I made this change >> for all 64-bit machines, both embedded and server. >> >> The patch series is against v4.5-rc4 plus Aneesh's "powerpc/mm/hash: >> Clear the invalid slot information correctly" patch. >> >> I have compiled this for all the defconfigs in the tree, without >> error. I have tested this, with the fixes branch of the powerpc tree >> merged in, both running bare-metal on a POWER8 and in a KVM guest on >> that POWER8 system. In the guest I tested both 4k and 64k configs, >> with THP enabled; in the host I tested with 64k page size and THP >> enabled. All these tests ran fine, including running a KVM guest on >> the bare-metal system. So far I have done kernel compiles in a loop >> as the test, but I plan to run LTP and possibly some other tests. >> >> Comments welcome. > > I was expecting some complex changes in asm and other part of the code. That > is one of the reason I was holding of a series like this till I get the > radix merged. I should have really tried the radix/hash linux page table > consolidation to see the impact. One of the details that i hit last time with _PAGE_PTE was the usage of @h symbol in asm code. I did a quick look and I guess we are ok. But it will be good to double check. pmdp_splitting_flush (which got removed) had usages like %4@h etc -aneesh _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
