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([2a01:599:915:8911:b13f:d972:e237:7fe2]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-441b2ad7ab1sm218825645e9.4.2025.05.06.07.30.18 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 06 May 2025 07:30:20 -0700 (PDT) Message-ID: Date: Tue, 6 May 2025 16:30:18 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 3/7] mm: Add batched versions of ptep_modify_prot_start/commit To: Lorenzo Stoakes , Dev Jain Cc: akpm@linux-foundation.org, ryan.roberts@arm.com, willy@infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, catalin.marinas@arm.com, will@kernel.org, Liam.Howlett@oracle.com, vbabka@suse.cz, jannh@google.com, anshuman.khandual@arm.com, peterx@redhat.com, joey.gouly@arm.com, ioworker0@gmail.com, baohua@kernel.org, kevin.brodsky@arm.com, quic_zhenhuah@quicinc.com, christophe.leroy@csgroup.eu, yangyicong@hisilicon.com, linux-arm-kernel@lists.infradead.org, namit@vmware.com, hughd@google.com, yang@os.amperecomputing.com, ziy@nvidia.com References: <20250429052336.18912-1-dev.jain@arm.com> <20250429052336.18912-4-dev.jain@arm.com> <8780e63d-22c1-4133-a800-dec50fd1b5fa@lucifer.local> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 842534000B X-Stat-Signature: suhit9fhxrs1k1s15ypn59167mu9pe9a X-Rspam-User: X-HE-Tag: 1746541826-572434 X-HE-Meta: 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 wGcRk9JL 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 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: List-Subscribe: List-Unsubscribe: On 30.04.25 16:37, Lorenzo Stoakes wrote: > On Wed, Apr 30, 2025 at 11:55:12AM +0530, Dev Jain wrote: >> >> >> On 29/04/25 7:22 pm, Lorenzo Stoakes wrote: >>> On Tue, Apr 29, 2025 at 10:53:32AM +0530, Dev Jain wrote: >>>> Batch ptep_modify_prot_start/commit in preparation for optimizing mprotect. >>>> Architecture can override these helpers. >>>> >>>> Signed-off-by: Dev Jain >>>> --- >>>> include/linux/pgtable.h | 38 ++++++++++++++++++++++++++++++++++++++ >>>> 1 file changed, 38 insertions(+) >>>> >>>> diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h >>>> index b50447ef1c92..ed287289335f 100644 >>>> --- a/include/linux/pgtable.h >>>> +++ b/include/linux/pgtable.h >>>> @@ -891,6 +891,44 @@ static inline void wrprotect_ptes(struct mm_struct *mm, unsigned long addr, >>>> } >>>> #endif >>>> >>>> +/* See the comment for ptep_modify_prot_start */ >>> >>> I feel like you really should add a little more here, perhaps point out >>> that it's batched etc. >> >> Sure. I couldn't easily figure out a way to write the documentation nicely, >> I'll do it this time. > > Thanks! Though see the discussion with Ryan also. > >> >>> >>>> +#ifndef modify_prot_start_ptes >>>> +static inline pte_t modify_prot_start_ptes(struct vm_area_struct *vma, >>>> + unsigned long addr, pte_t *ptep, unsigned int nr) >>> >>> This name is a bit confusing, it's not any ptes, it's those pte entries >>> belonging to a large folio capped to the PTE table right that you are >>> batching right? >> >> yes, but I am just following the convention. See wrprotect_ptes(), etc. I >> don't have a strong preference anyways. >> >>> >>> Perhaps modify_prot_start_large_folio() ? Or something with 'batched' in >>> the name? >> >> How about modify_prot_start_batched_ptes()? > > I like this :) Ryan - that work for you, or do you feel _batched_ should be > dropped here? modify_prot_start_folio_ptes ? But I would rather go with modify_prot_folio_ptes_start The "batched" is implicit, and "large folio" is not required if it's more than one pte ... :) -- Cheers, David / dhildenb