From: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
To: Anshuman Khandual <anshuman.khandual@arm.com>,
linux-mm@kvack.org, akpm@linux-foundation.org
Cc: mpe@ellerman.id.au, linuxppc-dev@lists.ozlabs.org,
linux-arm-kernel@lists.infradead.org, linux-s390@vger.kernel.org,
linux-snps-arc@lists.infradead.org, x86@kernel.org,
linux-arch@vger.kernel.org,
Gerald Schaefer <gerald.schaefer@de.ibm.com>,
Christophe Leroy <christophe.leroy@c-s.fr>,
Vineet Gupta <vgupta@synopsys.com>,
Mike Rapoport <rppt@linux.ibm.com>, Qian Cai <cai@lca.pw>
Subject: Re: [PATCH v3 06/13] mm/debug_vm_pgtable/THP: Mark the pte entry huge before using set_pmd/pud_at
Date: Tue, 1 Sep 2020 11:53:02 +0530 [thread overview]
Message-ID: <60857a9f-0df2-ff19-d857-8e8582e85099@linux.ibm.com> (raw)
In-Reply-To: <37558832-9cb6-9a11-0009-e268ad51c1f3@arm.com>
On 9/1/20 8:51 AM, Anshuman Khandual wrote:
>
>
> On 08/27/2020 01:34 PM, Aneesh Kumar K.V wrote:
>> kernel expects entries to be marked huge before we use set_pmd_at()/set_pud_at().
>>
>> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
>> ---
>> mm/debug_vm_pgtable.c | 21 ++++++++++++---------
>> 1 file changed, 12 insertions(+), 9 deletions(-)
>>
>> diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c
>> index 5c0680836fe9..de83a20c1b30 100644
>> --- a/mm/debug_vm_pgtable.c
>> +++ b/mm/debug_vm_pgtable.c
>> @@ -155,7 +155,7 @@ static void __init pmd_advanced_tests(struct mm_struct *mm,
>> unsigned long pfn, unsigned long vaddr,
>> pgprot_t prot)
>> {
>> - pmd_t pmd = pfn_pmd(pfn, prot);
>> + pmd_t pmd;
>>
>> if (!has_transparent_hugepage())
>> return;
>> @@ -164,19 +164,19 @@ static void __init pmd_advanced_tests(struct mm_struct *mm,
>> /* Align the address wrt HPAGE_PMD_SIZE */
>> vaddr = (vaddr & HPAGE_PMD_MASK) + HPAGE_PMD_SIZE;
>>
>> - pmd = pfn_pmd(pfn, prot);
>> + pmd = pmd_mkhuge(pfn_pmd(pfn, prot));
>> set_pmd_at(mm, vaddr, pmdp, pmd);
>> pmdp_set_wrprotect(mm, vaddr, pmdp);
>> pmd = READ_ONCE(*pmdp);
>> WARN_ON(pmd_write(pmd));
>>
>> - pmd = pfn_pmd(pfn, prot);
>> + pmd = pmd_mkhuge(pfn_pmd(pfn, prot));
>> set_pmd_at(mm, vaddr, pmdp, pmd);
>> pmdp_huge_get_and_clear(mm, vaddr, pmdp);
>> pmd = READ_ONCE(*pmdp);
>> WARN_ON(!pmd_none(pmd));
>>
>> - pmd = pfn_pmd(pfn, prot);
>> + pmd = pmd_mkhuge(pfn_pmd(pfn, prot));
>> pmd = pmd_wrprotect(pmd);
>> pmd = pmd_mkclean(pmd);
>> set_pmd_at(mm, vaddr, pmdp, pmd);
>> @@ -237,7 +237,7 @@ static void __init pmd_huge_tests(pmd_t *pmdp, unsigned long pfn, pgprot_t prot)
>>
>> static void __init pmd_savedwrite_tests(unsigned long pfn, pgprot_t prot)
>> {
>> - pmd_t pmd = pfn_pmd(pfn, prot);
>> + pmd_t pmd = pmd_mkhuge(pfn_pmd(pfn, prot));
>
> There is no set_pmd_at() in this particular test, why change ?
because if you are building a hugepage you should use pmd_mkhuge(). That
is what is setting _PAGE_PTE with this series. We don't make pfn_pmd set
_PAGE_PTE
-aneesh
next prev parent reply other threads:[~2020-09-01 6:23 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-27 8:04 [PATCH v3 00/13] mm/debug_vm_pgtable fixes Aneesh Kumar K.V
2020-08-27 8:04 ` [PATCH v3 01/13] powerpc/mm: Add DEBUG_VM WARN for pmd_clear Aneesh Kumar K.V
2020-09-01 3:12 ` Anshuman Khandual
2020-08-27 8:04 ` [PATCH v3 02/13] powerpc/mm: Move setting pte specific flags to pfn_pte Aneesh Kumar K.V
2020-09-01 3:13 ` Anshuman Khandual
2020-08-27 8:04 ` [PATCH v3 03/13] mm/debug_vm_pgtable/ppc64: Avoid setting top bits in radom value Aneesh Kumar K.V
2020-09-01 3:15 ` Anshuman Khandual
2020-09-01 6:21 ` Aneesh Kumar K.V
2020-09-01 7:32 ` Anshuman Khandual
2020-09-01 7:36 ` Aneesh Kumar K.V
2020-09-01 7:46 ` Anshuman Khandual
2020-09-01 7:55 ` Aneesh Kumar K.V
2020-09-02 3:45 ` Anshuman Khandual
2020-08-27 8:04 ` [PATCH v3 04/13] mm/debug_vm_pgtables/hugevmap: Use the arch helper to identify huge vmap support Aneesh Kumar K.V
2020-09-01 3:16 ` Anshuman Khandual
2020-08-27 8:04 ` [PATCH v3 05/13] mm/debug_vm_pgtable/savedwrite: Enable savedwrite test with CONFIG_NUMA_BALANCING Aneesh Kumar K.V
2020-09-01 3:18 ` Anshuman Khandual
2020-08-27 8:04 ` [PATCH v3 06/13] mm/debug_vm_pgtable/THP: Mark the pte entry huge before using set_pmd/pud_at Aneesh Kumar K.V
2020-09-01 3:21 ` Anshuman Khandual
2020-09-01 6:23 ` Aneesh Kumar K.V [this message]
2020-08-27 8:04 ` [PATCH v3 07/13] mm/debug_vm_pgtable/set_pte/pmd/pud: Don't use set_*_at to update an existing pte entry Aneesh Kumar K.V
2020-08-27 8:04 ` [PATCH v3 08/13] mm/debug_vm_pgtable/thp: Use page table depost/withdraw with THP Aneesh Kumar K.V
2020-09-01 3:22 ` Anshuman Khandual
2020-09-01 6:25 ` Aneesh Kumar K.V
2020-09-01 6:50 ` Christophe Leroy
2020-09-01 7:40 ` Aneesh Kumar K.V
2020-09-01 7:51 ` Christophe Leroy
2020-09-02 3:45 ` Anshuman Khandual
2020-08-27 8:04 ` [PATCH v3 09/13] mm/debug_vm_pgtable/locks: Move non page table modifying test together Aneesh Kumar K.V
2020-09-01 3:41 ` Anshuman Khandual
2020-09-01 6:38 ` Aneesh Kumar K.V
2020-09-01 9:33 ` Anshuman Khandual
2020-09-01 9:36 ` Aneesh Kumar K.V
2020-09-01 9:58 ` Anshuman Khandual
2020-08-27 8:04 ` [PATCH v3 10/13] mm/debug_vm_pgtable/locks: Take correct page table lock Aneesh Kumar K.V
2020-09-01 3:44 ` Anshuman Khandual
2020-08-27 8:04 ` [PATCH v3 11/13] mm/debug_vm_pgtable/pmd_clear: Don't use pmd/pud_clear on pte entries Aneesh Kumar K.V
2020-08-27 8:04 ` [PATCH v3 12/13] mm/debug_vm_pgtable/hugetlb: Disable hugetlb test on ppc64 Aneesh Kumar K.V
2020-09-01 4:03 ` Anshuman Khandual
2020-09-01 6:30 ` Aneesh Kumar K.V
2020-09-01 7:59 ` Christophe Leroy
2020-09-02 13:05 ` Anshuman Khandual
2020-09-02 13:20 ` Aneesh Kumar K.V
2020-08-27 8:04 ` [PATCH v3 13/13] mm/debug_vm_pgtable: populate a pte entry before fetching it Aneesh Kumar K.V
2020-08-27 12:17 ` kernel test robot
2020-09-01 3:25 ` Anshuman Khandual
2020-09-01 6:37 ` Aneesh Kumar K.V
2020-09-01 7:38 ` Anshuman Khandual
2020-09-01 9:58 ` Aneesh Kumar K.V
2020-09-02 3:49 ` Anshuman Khandual
2020-09-02 3:58 ` Aneesh Kumar K.V
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