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[2003:d8:2f0c:c200:fa4a:c4ff:1b32:21ce]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-471144c82b8sm13134415e9.15.2025.10.16.01.59.03 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 16 Oct 2025 01:59:03 -0700 (PDT) Message-ID: <1f7c3b59-3276-4f6e-946b-5f6ac9807e93@redhat.com> Date: Thu, 16 Oct 2025 10:59:02 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH -v2 1/2] mm: add spurious fault fixing support for huge pmd To: Lorenzo Stoakes , "Huang, Ying" Cc: Catalin Marinas , Will Deacon , Andrew Morton , Vlastimil Babka , Zi Yan , Baolin Wang , Ryan Roberts , Yang Shi , "Christoph Lameter (Ampere)" , Dev Jain , Barry Song , Anshuman Khandual , Yicong Yang , Kefeng Wang , Kevin Brodsky , Yin Fengwei , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org References: <20251013092038.6963-1-ying.huang@linux.alibaba.com> <20251013092038.6963-2-ying.huang@linux.alibaba.com> <4c453dcc-2837-4f1a-905b-3462270f5e31@lucifer.local> <87ldlcpnbx.fsf@DESKTOP-5N7EMDA> <87bjm7lh4u.fsf@DESKTOP-5N7EMDA> <3fc642be-b8f3-4fcb-b13c-3359cd52e921@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: rspam05 X-Stat-Signature: e1qa6wgkwxzdh783t1s8yay3ak3i1sy8 X-Rspam-User: X-Rspamd-Queue-Id: 5ECBBA0007 X-HE-Tag: 1760605175-953627 X-HE-Meta: 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 yTOhd9X5 jprdFojkGWlhODJsCRRDsdd5aSIxgp3jOljXRIp0Kvvs0BBr3mAKCIvZbxa1M7j/mHJRRGgKlfnVOiHAl83o4NxZx3TmU4BRpGu40PogTAnKsfZrXJqeqc08fcrk+0WF1QEkn 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 16.10.25 10:25, Lorenzo Stoakes wrote: > On Thu, Oct 16, 2025 at 10:22:57AM +0800, Huang, Ying wrote: >> Lorenzo Stoakes writes: >> >>> On Wed, Oct 15, 2025 at 04:43:14PM +0800, Huang, Ying wrote: >>> OK this is great, let's put it all in the kdoc for the new shared spurious >>> faulting function! :) and additionally add it to the commit message. >> >> Sure. Will do it in the next version. > > Thanks! > >> >> [snip] >> >>>>>> >>>>>> diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h >>>>>> index 32e8457ad535..341622ec80e4 100644 >>>>>> --- a/include/linux/pgtable.h >>>>>> +++ b/include/linux/pgtable.h >>>>>> @@ -1232,6 +1232,10 @@ static inline void arch_swap_restore(swp_entry_t entry, struct folio *folio) >>>>>> #define flush_tlb_fix_spurious_fault(vma, address, ptep) flush_tlb_page(vma, address) >>>>>> #endif >>>>>> >>>>>> +#ifndef flush_tlb_fix_spurious_fault_pmd >>>>>> +#define flush_tlb_fix_spurious_fault_pmd(vma, address, ptep) do { } while (0) >>>>>> +#endif >>>>> >>>>> flush_tlb_fix_spurious_fault(), when the arch doesn't declare it, defaults to >>>>> flush_tlb_page() - why do we just do nothing in this case here? >>>> >>>> Because all architectures do nothing for the spurious PMD page fault >>>> fixing until the [2/2] of this series. Where, we make it necessary to >>>> flush the local TLB for spurious PMD page fault fixing on arm64 >>>> architecture. >>>> >>>> If we follow the design of flush_tlb_fix_spurious_fault(), we need to >>>> change all architecture implementation to do nothing in this patch to >>>> keep the current behavior. I don't think that it's a good idea. Do >>>> you agree? >>> >>> Yeah probably we should keep the same behaviour as before, which is >>> obviously, prior to this series, we did nothing. >>> >>> I guess in the PTE case we _always_ want to flush the TLB, whereas in the >>> PMD case we otherwise don't have any need to at the point at which the >>> spurious flush is performed. >>> >>> But from your explanation above re: the stale TLB entry this _only_ needs >>> to be done for architectures which might encounter this problem rather than >>> needing a TLB flush in general. >>> >>> Given we're generalising the code and one case always flushes the TLB and >>> the other doesn't maybe it's worth putting a comment in the generalised >>> function mentioning this? >> >> I'm not sure whether it's a good idea to document architecture behaviors >> in the general code. The behavior may be changed architecture by >> architecture in the future. > > Right, but we are unconditionaly doing a TLB flush in the PTE case but not PMD > so let's document that to be clear :) Agreed! That's a big benefit of merging the code, it sticks out what is not common already. -- Cheers David / dhildenb