From: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
To: npiggin@gmail.com, benh@kernel.crashing.org, paulus@samba.org,
mpe@ellerman.id.au
Cc: linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH V3 1/6] powerpc/mm/book3s: Update pmd_present to look at _PAGE_PRESENT bit
Date: Fri, 24 Aug 2018 11:32:04 +0530 [thread overview]
Message-ID: <2112b519-3df5-d45a-b6d6-3fcc805bc0ef@linux.ibm.com> (raw)
In-Reply-To: <20180824060008.18396-1-aneesh.kumar@linux.ibm.com>
On 08/24/2018 11:30 AM, Aneesh Kumar K.V wrote:
> With this patch we use 0x8000000000000000UL (_PAGE_PRESENT) to indicate a valid
> pgd/pud/pmd entry. We also switch the p**_present() to look at this bit.
>
> With pmd_present, we have a special case. We need to make sure we consider a
> pmd marked invalid during THP split as present. Right now we clear the
> _PAGE_PRESENT bit during a pmdp_invalidate. Inorder to consider this special
> case we add a new pte bit _PAGE_INVALID (mapped to _RPAGE_SW0). This bit is
> only used with _PAGE_PRESENT cleared. Hence we are not really losing a pte bit
> for this special case. pmd_present is also updated to look at _PAGE_INVALID.
>
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Changese from V2:
* Rebased to mpe/merge
* Also fixup new WARN_ON with pte_present looking at _PAGE_INVALID now.
-aneesh
next prev parent reply other threads:[~2018-08-24 6:02 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-24 6:00 [PATCH V3 1/6] powerpc/mm/book3s: Update pmd_present to look at _PAGE_PRESENT bit Aneesh Kumar K.V
2018-08-24 6:00 ` [PATCH V3 2/6] powerpc/mm/hugetlb/book3s: add _PAGE_PRESENT to hugepd pointer Aneesh Kumar K.V
2018-08-24 6:00 ` [PATCH V3 3/6] powerpc/mm/book3s: Check for pmd_large instead of pmd_trans_huge Aneesh Kumar K.V
2018-08-24 6:00 ` [PATCH V3 4/6] arch/powerpc/mm/hash: validate the pte entries before handling the hash fault Aneesh Kumar K.V
2018-08-24 6:00 ` [PATCH V3 5/6] powerpc/mm/thp: update pmd_trans_huge to check for pmd_present Aneesh Kumar K.V
2018-08-24 6:00 ` [PATCH V3 6/6] powerpc/mm:book3s: Enable THP migration support Aneesh Kumar K.V
2018-08-24 6:02 ` Aneesh Kumar K.V [this message]
2018-08-24 10:29 ` [PATCH V3 1/6] powerpc/mm/book3s: Update pmd_present to look at _PAGE_PRESENT bit kbuild test robot
2018-08-24 10:34 ` kbuild test robot
2018-09-20 18:09 Aneesh Kumar K.V
2018-09-21 5:55 ` Christophe LEROY
2018-09-21 10:26 ` Aneesh Kumar K.V
2018-09-21 10:52 ` Christophe LEROY
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