Re: [PATCH V2 1/2] mm/autonuma: Let architecture override how the write bit should be stashed in a protnone pte.

From	Michael Ellerman <michaele@au1.ibm.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH V2 1/2] mm/autonuma: Let architecture override how the write bit should be stashed in a protnone pte.
Date	2017-02-14 12:10 +0100
Message-ID	<taJ9D-186-11@gated-at.bofh.it> (permalink)
References	<taE0i-5U6-1@gated-at.bofh.it> <taE0i-5U6-7@gated-at.bofh.it> <taEjD-61A-9@gated-at.bofh.it> <taEjD-61A-11@gated-at.bofh.it>
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"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> writes:

> On Tuesday 14 February 2017 11:19 AM, Michael Ellerman wrote:
>> "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> writes:
>>
>>> Autonuma preserves the write permission across numa fault to avoid taking
>>> a writefault after a numa fault (Commit: b191f9b106ea " mm: numa: preserve PTE
>>> write permissions across a NUMA hinting fault"). Architecture can implement
>>> protnone in different ways and some may choose to implement that by clearing Read/
>>> Write/Exec bit of pte. Setting the write bit on such pte can result in wrong
>>> behaviour. Fix this up by allowing arch to override how to save the write bit
>>> on a protnone pte.
>> This is pretty obviously a nop on arches that don't implement the new
>> hooks, but it'd still be good to get an ack from someone in mm land
>> before I merge it.
>
>
> To get it apply cleanly you may need
> http://ozlabs.org/~akpm/mmots/broken-out/mm-autonuma-dont-use-set_pte_at-when-updating-protnone-ptes.patch
> http://ozlabs.org/~akpm/mmots/broken-out/mm-autonuma-dont-use-set_pte_at-when-updating-protnone-ptes-fix.patch

Ah OK, I missed those.

In that case these two should probably go via Andrew's tree.

cheers

Thread

[PATCH V2 0/2] Numabalancing preserve write fix "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> - 2017-02-14 06:40 +0100
  [PATCH V2 1/2] mm/autonuma: Let architecture override how the write bit should be stashed in a protnone pte. "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> - 2017-02-14 06:40 +0100
    Re: [PATCH V2 1/2] mm/autonuma: Let architecture override how the write bit should be stashed in a protnone pte. Michael Ellerman <michaele@au1.ibm.com> - 2017-02-14 07:00 +0100
      Re: [PATCH V2 1/2] mm/autonuma: Let architecture override how the  write bit should be stashed in a protnone pte. "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> - 2017-02-14 07:00 +0100
        Re: [PATCH V2 1/2] mm/autonuma: Let architecture override how the write bit should be stashed in a protnone pte. Michael Ellerman <michaele@au1.ibm.com> - 2017-02-14 12:10 +0100
          Re: [PATCH V2 1/2] mm/autonuma: Let architecture override how the  write bit should be stashed in a protnone pte. Andrew Morton <akpm@linux-foundation.org> - 2017-02-15 01:30 +0100
  [PATCH V2 2/2] powerpc/mm/autonuma: Switch ppc64 to its own implementeation of saved write "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> - 2017-02-14 06:40 +0100
    Re: [PATCH V2 2/2] powerpc/mm/autonuma: Switch ppc64 to its own implementeation of saved write Michael Ellerman <mpe@ellerman.id.au> - 2017-02-14 12:10 +0100
      Re: [PATCH V2 2/2] powerpc/mm/autonuma: Switch ppc64 to its own implementeation of saved write "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> - 2017-02-14 13:30 +0100
        Re: [PATCH V2 2/2] powerpc/mm/autonuma: Switch ppc64 to its own implementeation of saved write Michael Ellerman <mpe@ellerman.id.au> - 2017-02-15 01:50 +0100

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