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Thu, 13 Aug 2020 05:26:46 +0000 (UTC) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 8D8A6D6E; Wed, 12 Aug 2020 22:26:45 -0700 (PDT) Received: from [192.168.0.129] (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id B17223F6CF; Wed, 12 Aug 2020 22:26:43 -0700 (PDT) From: Anshuman Khandual Subject: Re: [PATCH 10/16] debug_vm_pgtable/thp: Use page table depost/withdraw with THP To: "Aneesh Kumar K.V" , linux-mm@kvack.org, akpm@linux-foundation.org Cc: mpe@ellerman.id.au, linuxppc-dev@lists.ozlabs.org References: <20200812063358.369514-1-aneesh.kumar@linux.ibm.com> <20200812063358.369514-10-aneesh.kumar@linux.ibm.com> Message-ID: <40f2acb5-1da3-4c0a-5590-3fd12d128421@arm.com> Date: Thu, 13 Aug 2020 10:55:14 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <20200812063358.369514-10-aneesh.kumar@linux.ibm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: EEE4E180F8B80 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam01 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 08/12/2020 12:03 PM, Aneesh Kumar K.V wrote: > Architectures like ppc64 use deposited page table while updating the huge pte > entries. > > Signed-off-by: Aneesh Kumar K.V > --- > mm/debug_vm_pgtable.c | 8 ++++++-- > 1 file changed, 6 insertions(+), 2 deletions(-) > > diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c > index 644d28861ce9..48475d288df1 100644 > --- a/mm/debug_vm_pgtable.c > +++ b/mm/debug_vm_pgtable.c > @@ -147,7 +147,7 @@ static void __init pmd_basic_tests(unsigned long pfn, pgprot_t prot) > static void __init pmd_advanced_tests(struct mm_struct *mm, > struct vm_area_struct *vma, pmd_t *pmdp, > unsigned long pfn, unsigned long vaddr, > - pgprot_t prot) > + pgprot_t prot, pgtable_t pgtable) > { > pmd_t pmd; > > @@ -158,6 +158,8 @@ 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; > > + pgtable_trans_huge_deposit(mm, pmdp, pgtable); > + > pmd = pmd_mkhuge(pfn_pmd(pfn, prot)); > set_pmd_at(mm, vaddr, pmdp, pmd); > pmdp_set_wrprotect(mm, vaddr, pmdp); > @@ -188,6 +190,8 @@ static void __init pmd_advanced_tests(struct mm_struct *mm, > pmdp_test_and_clear_young(vma, vaddr, pmdp); > pmd = READ_ONCE(*pmdp); > WARN_ON(pmd_young(pmd)); > + > + pgtable = pgtable_trans_huge_withdraw(mm, pmdp); > } > > static void __init pmd_leaf_tests(unsigned long pfn, pgprot_t prot) > @@ -1002,7 +1006,7 @@ static int __init debug_vm_pgtable(void) > pgd_clear_tests(mm, pgdp); > > pte_advanced_tests(mm, vma, ptep, pte_aligned, vaddr, prot); > - pmd_advanced_tests(mm, vma, pmdp, pmd_aligned, vaddr, prot); > + pmd_advanced_tests(mm, vma, pmdp, pmd_aligned, vaddr, prot, saved_ptep); > pud_advanced_tests(mm, vma, pudp, pud_aligned, vaddr, prot); > hugetlb_advanced_tests(mm, vma, ptep, pte_aligned, vaddr, prot); > > Makes sense, if it is required for THP to work correctly but needs to be tested across enabled platforms. Why should not the same apply for pud_advanced_tests() on platforms that supports PUD based THP.