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From: Scott Wood <scottwood@freescale.com>
To: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: <benh@kernel.crashing.org>, <paulus@samba.org>,
	<mpe@ellerman.id.au>, <linuxppc-dev@lists.ozlabs.org>
Subject: Re: [PATCH 00/31] powerpc/mm: Update page table format for book3s 64
Date: Tue, 22 Sep 2015 01:57:33 -0500	[thread overview]
Message-ID: <1442905053.19102.228.camel@freescale.com> (raw)
In-Reply-To: <877fnj3q6m.fsf@linux.vnet.ibm.com>

On Tue, 2015-09-22 at 12:18 +0530, Aneesh Kumar K.V wrote:
> Scott Wood <scottwood@freescale.com> writes:
> 
> > On Mon, 2015-09-21 at 12:10 +0530, Aneesh Kumar K.V wrote:
> > > Hi All,
> > > 
> > > This patch series attempt to update book3s 64 linux page table format to
> > > make it more flexible. Our current pte format is very restrictive and we
> > > overload multiple pte bits. This is due to the non-availability of free 
> > > bits
> > > in pte_t. We use pte_t to track the validity of 4K subpages. This patch
> > > series free up pte_t of 11 bits by moving 4K subpage tracking to the
> > > lower half of PTE page. The pte format is updated such that we have a
> > > better method for identifying a pte entry at pmd level. This will also 
> > > enable
> > > us to implement hugetlb migration(not yet done in this series). 
> > > 
> > > Before making the changes to the pte format, I am splitting the
> > > pte header definition such that we now have the below layout for headers
> > > 
> > > book3s
> > >    32
> > >      hash.h pgtable.h 
> > >    64
> > >      hash.h  pgtable.h hash-4k.h hash-64k.h
> > > booke
> > >   32
> > >      pgtable.h pte-40x.h pte-44x.h pte-8xx.h pte-fsl-booke.h
> > >   64
> > >     pgtable-4k.h  pgtable-64k.h  pgtable.h
> > 
> > 40x and 8xx are not booke.  Is there a better name that can be used for 
> > this 
> > directory?  Maybe "nohash", similar to arch/powerpc/mm/tlb_nohash.c?
> > 
> 
> I looked at Documentation/powerpc/cpu_families.txt to name the headers.
> It lists then below booke.

It lists 40x as booke (there was some question about that when 
cpu_families.txt was added...  I guess you could call it "proto-booke", 
though it doesn't use CONFIG_BOOKE in Linux), but 8xx is in its own category.

In any case, "nohash" is the term used elsewhere.

-Scott

  reply	other threads:[~2015-09-22  6:57 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-09-21  6:40 [PATCH 00/31] powerpc/mm: Update page table format for book3s 64 Aneesh Kumar K.V
2015-09-21  6:40 ` [PATCH 01/31] powerpc/mm: move pte headers to book3s directory Aneesh Kumar K.V
2015-09-21  6:40 ` [PATCH 02/31] powerpc/mm: move pte headers to book3s directory (part 2) Aneesh Kumar K.V
2015-09-21  6:40 ` [PATCH 03/31] powerpc/mm: make a separate copy for book3s Aneesh Kumar K.V
2015-09-21 21:58   ` Scott Wood
2015-09-22  6:42     ` Aneesh Kumar K.V
2015-09-21  6:40 ` [PATCH 04/31] powerpc/mm: make a separate copy for book3s (part 2) Aneesh Kumar K.V
2015-09-21  6:40 ` [PATCH 05/31] powerpc/mm: Move hash specific pte width and other defines to book3s Aneesh Kumar K.V
2015-09-21  6:40 ` [PATCH 06/31] powerpc/mm: Delete booke bits from book3s Aneesh Kumar K.V
2015-09-21  6:40 ` [PATCH 07/31] powerpc/mm: Don't have generic headers introduce functions touching pte bits Aneesh Kumar K.V
2015-09-21  6:40 ` [PATCH 08/31] powerpc/mm: Drop pte-common.h from BOOK3S 64 Aneesh Kumar K.V
2015-09-21  6:40 ` [PATCH 09/31] powerpc/mm: Don't use pte_val as lvalue Aneesh Kumar K.V
2015-09-22  2:22   ` Scott Wood
2015-09-22  6:44     ` Aneesh Kumar K.V
2015-09-22  6:46       ` Scott Wood
2015-09-21  6:40 ` [PATCH 10/31] powerpc/mm: Don't use pmd_val, pud_val and pgd_val " Aneesh Kumar K.V
2015-09-22  2:23   ` Scott Wood
2015-09-22  6:45     ` Aneesh Kumar K.V
2015-09-21  6:40 ` [PATCH 11/31] powerpc/mm: Move hash64 PTE bits from book3s/64/pgtable.h to hash.h Aneesh Kumar K.V
2015-09-21  6:40 ` [PATCH 12/31] powerpc/mm: Move PTE bits from generic functions to hash64 functions Aneesh Kumar K.V
2015-09-21  6:40 ` [PATCH 13/31] powerpc/booke: Move booke headers (part 1) Aneesh Kumar K.V
2015-09-21  6:40 ` [PATCH 14/31] powerpc/booke: Move booke headers (part 2) Aneesh Kumar K.V
2015-09-21  6:40 ` [PATCH 15/31] powerpc/booke: Move booke headers (part 3) Aneesh Kumar K.V
2015-09-21  6:40 ` [PATCH 16/31] powerpc/booke: Move booke headers (part 4) Aneesh Kumar K.V
2015-09-21  6:40 ` [PATCH 17/31] powerpc/booke: Move booke headers (part 5) Aneesh Kumar K.V
2015-09-21  6:40 ` [PATCH 18/31] powerpc/mm: Increase the pte frag size Aneesh Kumar K.V
2015-09-21  8:14   ` Benjamin Herrenschmidt
2015-09-21  8:45     ` Aneesh Kumar K.V
2015-09-21 11:06       ` Benjamin Herrenschmidt
2015-09-21 11:53         ` Aneesh Kumar K.V
2015-09-23 21:37           ` Benjamin Herrenschmidt
2015-09-28  4:55             ` Aneesh Kumar K.V
2015-09-21  6:40 ` [PATCH 19/31] powerpc/mm: Convert 4k hash insert to C Aneesh Kumar K.V
2015-09-21  8:16   ` Benjamin Herrenschmidt
2015-09-21  8:57     ` Aneesh Kumar K.V
2015-09-29  8:13     ` Aneesh Kumar K.V
2015-09-21  6:40 ` [PATCH 20/31] powerpc/mm: update __real_pte to take address as argument Aneesh Kumar K.V
2015-09-21  6:40 ` [PATCH 21/31] powerpc/mm: make pte page hash index slot 8 bits Aneesh Kumar K.V
2015-09-21  6:40 ` [PATCH 22/31] powerpc/mm: Don't track subpage valid bit in pte_t Aneesh Kumar K.V
2015-09-21  6:40 ` [PATCH 23/31] powerpc/mm: Increase the width of #define Aneesh Kumar K.V
2015-09-21  6:40 ` [PATCH 24/31] powerpc/mm: Convert __hash_page_64K to C Aneesh Kumar K.V
2015-09-23 13:56   ` Anshuman Khandual
2015-09-28  4:58     ` Aneesh Kumar K.V
2015-09-21  6:40 ` [PATCH 25/31] powerpc/mm: Convert 4k insert from asm " Aneesh Kumar K.V
2015-09-21  6:40 ` [PATCH 26/31] powerpc/mm: Remove the dependency on pte bit position in asm code Aneesh Kumar K.V
2015-09-21  6:40 ` [PATCH 27/31] powerpc/mm: Add helper for converting pte bit to hpte bits Aneesh Kumar K.V
2015-09-21  6:40 ` [PATCH 28/31] powerpc/mm: Move WIMG update to helper Aneesh Kumar K.V
2015-09-21  6:40 ` [PATCH 29/31] powerpc/mm: Move hugetlb related headers Aneesh Kumar K.V
2015-09-21  6:40 ` [PATCH 30/31] powerpc/mm: Move THP headers around Aneesh Kumar K.V
2015-09-21  6:40 ` [PATCH 31/31] powerpc/mm: Add a _PAGE_PTE bit Aneesh Kumar K.V
2015-09-21 21:48 ` [PATCH 00/31] powerpc/mm: Update page table format for book3s 64 Scott Wood
2015-09-22  6:48   ` Aneesh Kumar K.V
2015-09-22  6:57     ` Scott Wood [this message]
2015-09-28  4:56       ` Aneesh Kumar K.V
2015-09-28 16:41         ` Scott Wood
2015-09-30  1:44           ` Michael Ellerman
2015-09-29  0:12         ` Benjamin Herrenschmidt

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