From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
paulus@samba.org, mpe@ellerman.id.au,
Scott Wood <scottwood@freescale.com>,
Denis Kirjanov <kda@linux-powerpc.org>
Cc: linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH V5 00/31] powerpc/mm: Update page table format for book3s 64
Date: Tue, 24 Nov 2015 09:01:15 +0530 [thread overview]
Message-ID: <8737vwul8c.fsf@linux.vnet.ibm.com> (raw)
In-Reply-To: <1448321325.4574.19.camel@kernel.crashing.org>
Benjamin Herrenschmidt <benh@kernel.crashing.org> writes:
> On Mon, 2015-11-23 at 15:52 +0530, Aneesh Kumar K.V wrote:
>> 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
>
> This series actually completely removes the tracking of the subages,
> right ? IE, it also halves the memory footprint of page tables, doesn't
> it ?
>
No, that is done in the next series.
http://mid.gmane.org/1448274825-30289-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com
-aneesh
next prev parent reply other threads:[~2015-11-24 3:32 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-23 10:22 [PATCH V5 00/31] powerpc/mm: Update page table format for book3s 64 Aneesh Kumar K.V
2015-11-23 10:22 ` [PATCH V5 01/31] powerpc/mm: move pte headers to book3s directory Aneesh Kumar K.V
2015-11-23 10:22 ` [PATCH V5 02/31] powerpc/mm: move pte headers to book3s directory (part 2) Aneesh Kumar K.V
2015-11-24 8:58 ` Anshuman Khandual
2015-11-23 10:22 ` [PATCH V5 03/31] powerpc/mm: make a separate copy for book3s Aneesh Kumar K.V
2015-11-24 9:13 ` Anshuman Khandual
2015-11-23 10:22 ` [PATCH V5 04/31] powerpc/mm: make a separate copy for book3s (part 2) Aneesh Kumar K.V
2015-11-24 11:22 ` Anshuman Khandual
2015-11-23 10:22 ` [PATCH V5 05/31] powerpc/mm: Move hash specific pte width and other defines to book3s Aneesh Kumar K.V
2015-11-24 11:19 ` Anshuman Khandual
2015-11-23 10:22 ` [PATCH V5 06/31] powerpc/mm: Delete booke bits from book3s Aneesh Kumar K.V
2015-11-23 10:22 ` [PATCH V5 07/31] powerpc/mm: Don't have generic headers introduce functions touching pte bits Aneesh Kumar K.V
2015-11-23 10:22 ` [PATCH V5 08/31] powerpc/mm: Drop pte-common.h from BOOK3S 64 Aneesh Kumar K.V
2015-11-25 5:26 ` Anshuman Khandual
2015-11-23 10:22 ` [PATCH V5 09/31] powerpc/mm: Don't use pte_val as lvalue Aneesh Kumar K.V
2015-11-23 10:22 ` [PATCH V5 10/31] powerpc/mm: Don't use pmd_val, pud_val and pgd_val " Aneesh Kumar K.V
2015-11-23 10:22 ` [PATCH V5 11/31] powerpc/mm: Move hash64 PTE bits from book3s/64/pgtable.h to hash.h Aneesh Kumar K.V
2015-11-25 6:22 ` Anshuman Khandual
2015-11-23 10:22 ` [PATCH V5 12/31] powerpc/mm: Move PTE bits from generic functions to hash64 functions Aneesh Kumar K.V
2015-11-23 10:22 ` [PATCH V5 13/31] powerpc/booke: Move nohash headers (part 1) Aneesh Kumar K.V
2015-11-23 10:22 ` [PATCH V5 14/31] powerpc/booke: Move nohash headers (part 2) Aneesh Kumar K.V
2015-11-25 6:35 ` Anshuman Khandual
2015-11-23 10:22 ` [PATCH V5 15/31] powerpc/booke: Move nohash headers (part 3) Aneesh Kumar K.V
2015-11-23 10:22 ` [PATCH V5 16/31] powerpc/booke: Move nohash headers (part 4) Aneesh Kumar K.V
2015-11-23 10:22 ` [PATCH V5 17/31] powerpc/booke: Move nohash headers (part 5) Aneesh Kumar K.V
2015-11-25 9:44 ` Anshuman Khandual
2015-11-23 10:22 ` [PATCH V5 18/31] powerpc/mm: Increase the pte frag size Aneesh Kumar K.V
2015-11-23 10:22 ` [PATCH V5 19/31] powerpc/mm: Convert 4k hash insert to C Aneesh Kumar K.V
2015-11-23 10:22 ` [PATCH V5 20/31] powerpc/mm: update __real_pte to take address as argument Aneesh Kumar K.V
2015-11-23 10:22 ` [PATCH V5 21/31] powerpc/mm: make pte page hash index slot 8 bits Aneesh Kumar K.V
2015-11-27 6:52 ` Anshuman Khandual
2015-11-23 10:22 ` [PATCH V5 22/31] powerpc/mm: Don't track subpage valid bit in pte_t Aneesh Kumar K.V
2015-11-23 10:22 ` [PATCH V5 23/31] powerpc/mm: Increase the width of #define Aneesh Kumar K.V
2015-11-26 5:42 ` Anshuman Khandual
2015-11-23 10:22 ` [PATCH V5 24/31] powerpc/mm: Convert __hash_page_64K to C Aneesh Kumar K.V
2015-11-23 10:22 ` [PATCH V5 25/31] powerpc/mm: Convert 4k insert from asm " Aneesh Kumar K.V
2015-11-23 10:22 ` [PATCH V5 26/31] powerpc/mm: Remove the dependency on pte bit position in asm code Aneesh Kumar K.V
2015-11-26 13:32 ` Anshuman Khandual
2015-11-23 10:22 ` [PATCH V5 27/31] powerpc/mm: Add helper for converting pte bit to hpte bits Aneesh Kumar K.V
2015-11-23 10:22 ` [PATCH V5 28/31] powerpc/mm: Move WIMG update to helper Aneesh Kumar K.V
2015-11-26 13:49 ` Anshuman Khandual
2015-11-23 10:22 ` [PATCH V5 29/31] powerpc/mm: Move hugetlb related headers Aneesh Kumar K.V
2015-11-23 10:22 ` [PATCH V5 30/31] powerpc/mm: Move THP headers around Aneesh Kumar K.V
2015-11-24 10:16 ` Denis Kirjanov
2015-11-24 11:20 ` Aneesh Kumar K.V
2015-11-24 13:58 ` Denis Kirjanov
2015-11-23 10:22 ` [PATCH V5 31/31] powerpc/mm: Add a _PAGE_PTE bit Aneesh Kumar K.V
2015-11-24 9:36 ` Denis Kirjanov
2015-11-23 23:28 ` [PATCH V5 00/31] powerpc/mm: Update page table format for book3s 64 Benjamin Herrenschmidt
2015-11-24 3:31 ` Aneesh Kumar K.V [this message]
2015-11-24 6:48 ` Anshuman Khandual
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