From: Scott Wood <oss@buserror.net>
To: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au
Cc: linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH V4 00/18] Book3s abstraction in preparation for new MMU model
Date: Wed, 24 Feb 2016 22:34:24 -0600 [thread overview]
Message-ID: <1456374864.5360.33.camel@buserror.net> (raw)
In-Reply-To: <87povnhj5v.fsf@linux.vnet.ibm.com>
On Tue, 2016-02-23 at 14:56 +0530, Aneesh Kumar K.V wrote:
> "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> writes:
>
> > Hello,
> >
> > This series mostly consisting of code movement. One new thing added in
> > this series
> > is to switch book3s 64 to 4 level page table. The changes are done to
> > accomodate
> > the upcoming new memory model in future powerpc chips. The details of the
> > new
> > MMU model can be found at
> >
> > http://ibm.biz/power-isa3 (Needs registration). I am including a summary
> > of the changes below.
> >
> > ISA 3.0 adds support for the radix tree style of MMU with full
> > virtualization and related control mechanisms that manage its
> > coexistence with the HPT. Radix-using operating systems will
> > manage their own translation tables instead of relying on hcalls.
> >
> > Radix style MMU model requires us to do a 4 level page table
> > with 64K and 4K page size. The table index size different page size
> > is listed below
> >
> > PGD -> 13 bits
> > PUD -> 9 (1G hugepage)
> > PMD -> 9 (2M huge page)
> > PTE -> 5 (for 64k), 9 (for 4k)
> >
> > We also require the page table to be in big endian format.
> >
> > Changes from V3:
> > * rebase on top of PTE bits movement patch series
> > * Drop all the hash linux abstraction patches
> > * Keep only 4 level table and other code movement patches.
> >
> > Changes from V2:
> > * rebase to latest kernel
> > * Update commit messages
> > * address review comments
> >
> > Changes from V1:
> > * move patches adding helpers to the next series
> >
> >
> > NOTE:
> > This is lightly tested. Right now 4K linux page size is what is being
> > tested. Once that is done
> > I will have to do 64K linux page size tests.
> >
>
> Tested the below tests with 4K page size and 64K page size
> * libhugetlbfs test
> * ltp mm tests
> * kernel build in loop (testing thp collapse and split)
I did some basic tests on book3e (32 and 64 bit) and didn't see any problems
with this version of the patchset.
-Scott
prev parent reply other threads:[~2016-02-25 4:34 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-23 4:48 [PATCH V4 00/18] Book3s abstraction in preparation for new MMU model Aneesh Kumar K.V
2016-02-23 4:48 ` [PATCH V4 01/18] powerp/mm: Update code comments Aneesh Kumar K.V
2016-02-23 4:48 ` [PATCH V4 02/18] mm: Some arch may want to use HPAGE_PMD related values as variables Aneesh Kumar K.V
2016-02-25 5:06 ` Balbir Singh
2016-02-23 4:48 ` [PATCH V4 03/18] powerpc/mm: add _PAGE_HASHPTE similar to 4K hash Aneesh Kumar K.V
2016-02-23 5:38 ` Paul Mackerras
2016-02-23 9:22 ` Aneesh Kumar K.V
2016-02-23 4:48 ` [PATCH V4 04/18] powerpc/mm: Split pgtable types to separate header Aneesh Kumar K.V
2016-02-25 3:12 ` Paul Mackerras
2016-02-25 5:35 ` Balbir Singh
2016-02-23 4:48 ` [PATCH V4 05/18] powerpc/mm: Don't have conditional defines for real_pte_t Aneesh Kumar K.V
2016-02-25 3:24 ` Paul Mackerras
2016-02-25 6:03 ` Balbir Singh
2016-02-23 4:48 ` [PATCH V4 06/18] powerpc/mm: Switch book3s 64 with 64K page size to 4 level page table Aneesh Kumar K.V
2016-02-25 3:39 ` Paul Mackerras
2016-02-26 2:07 ` Aneesh Kumar K.V
2016-02-23 4:48 ` [PATCH V4 07/18] powerpc/mm: Update masked bits for linux " Aneesh Kumar K.V
2016-02-25 3:41 ` Paul Mackerras
2016-02-26 2:08 ` Aneesh Kumar K.V
2016-02-23 4:48 ` [PATCH V4 08/18] powerpc/mm: Copy pgalloc (part 1) Aneesh Kumar K.V
2016-02-25 4:27 ` Paul Mackerras
2016-02-26 2:11 ` Aneesh Kumar K.V
2016-02-23 4:48 ` [PATCH V4 09/18] powerpc/mm: Copy pgalloc (part 2) Aneesh Kumar K.V
2016-02-23 4:48 ` [PATCH V4 10/18] powerpc/mm: Copy pgalloc (part 3) Aneesh Kumar K.V
2016-02-23 4:48 ` [PATCH V4 11/18] powerpc/mm: Hugetlbfs is book3s_64 and fsl_book3e (32 or 64) Aneesh Kumar K.V
2016-02-25 5:41 ` Paul Mackerras
2016-02-26 9:57 ` Aneesh Kumar K.V
2016-02-23 4:48 ` [PATCH V4 12/18] powerpc/mm: Use flush_tlb_page in ptep_clear_flush_young Aneesh Kumar K.V
2016-02-23 4:48 ` [PATCH V4 13/18] powerpc/mm: Move hash related mmu-*.h headers to book3s/ Aneesh Kumar K.V
2016-02-23 4:48 ` [PATCH V4 14/18] powerpc/mm: Create a new headers for tlbflush for hash64 Aneesh Kumar K.V
2016-02-23 4:48 ` [PATCH V4 15/18] powerpc/mm: Move hash page table related functions to pgtable-hash64.c Aneesh Kumar K.V
2016-02-25 4:32 ` Scott Wood
2016-02-26 10:00 ` Aneesh Kumar K.V
2016-02-23 4:48 ` [PATCH V4 16/18] powerpc/mm: THP is only available on hash64 as of now Aneesh Kumar K.V
2016-02-23 4:48 ` [PATCH V4 17/18] powerpc/mm: Use generic version of pmdp_clear_flush_young Aneesh Kumar K.V
2016-02-23 4:48 ` [PATCH V4 18/18] powerpc/mm: Move hash64 specific definitions to separate header Aneesh Kumar K.V
2016-02-23 9:26 ` [PATCH V4 00/18] Book3s abstraction in preparation for new MMU model Aneesh Kumar K.V
2016-02-25 4:34 ` Scott Wood [this message]
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