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[2003:d8:2f09:3f00:d228:bd67:7baa:d604]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4290c738e01sm85236555e9.11.2024.08.09.11.06.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 09 Aug 2024 11:06:43 -0700 (PDT) Message-ID: <04d06717-4d44-4e09-a3cb-d8350e3466ad@redhat.com> Date: Fri, 9 Aug 2024 20:06:42 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 01/19] mm: Introduce ARCH_SUPPORTS_HUGE_PFNMAP and special bits to pmd/pud To: Peter Xu Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Sean Christopherson , Oscar Salvador , Jason Gunthorpe , Axel Rasmussen , linux-arm-kernel@lists.infradead.org, x86@kernel.org, Will Deacon , Gavin Shan , Paolo Bonzini , Zi Yan , Andrew Morton , Catalin Marinas , Ingo Molnar , Alistair Popple , Borislav Petkov , Thomas Gleixner , kvm@vger.kernel.org, Dave Hansen , Alex Williamson , Yan Zhao References: <20240809160909.1023470-1-peterx@redhat.com> <20240809160909.1023470-2-peterx@redhat.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240809_110650_781149_A53DAD74 X-CRM114-Status: GOOD ( 18.34 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 09.08.24 19:16, Peter Xu wrote: > On Fri, Aug 09, 2024 at 06:34:15PM +0200, David Hildenbrand wrote: >> On 09.08.24 18:08, Peter Xu wrote: >>> This patch introduces the option to introduce special pte bit into >>> pmd/puds. Archs can start to define pmd_special / pud_special when >>> supported by selecting the new option. Per-arch support will be added >>> later. >>> >>> Before that, create fallbacks for these helpers so that they are always >>> available. >>> >>> Signed-off-by: Peter Xu >>> --- >>> include/linux/mm.h | 24 ++++++++++++++++++++++++ >>> mm/Kconfig | 13 +++++++++++++ >>> 2 files changed, 37 insertions(+) >>> >>> diff --git a/include/linux/mm.h b/include/linux/mm.h >>> index 43b40334e9b2..90ca84200800 100644 >>> --- a/include/linux/mm.h >>> +++ b/include/linux/mm.h >>> @@ -2644,6 +2644,30 @@ static inline pte_t pte_mkspecial(pte_t pte) >>> } >>> #endif >>> +#ifndef CONFIG_ARCH_SUPPORTS_PMD_PFNMAP >>> +static inline bool pmd_special(pmd_t pmd) >>> +{ >>> + return false; >>> +} >>> + >>> +static inline pmd_t pmd_mkspecial(pmd_t pmd) >>> +{ >>> + return pmd; >>> +} >>> +#endif /* CONFIG_ARCH_SUPPORTS_PMD_PFNMAP */ >>> + >>> +#ifndef CONFIG_ARCH_SUPPORTS_PUD_PFNMAP >>> +static inline bool pud_special(pud_t pud) >>> +{ >>> + return false; >>> +} >>> + >>> +static inline pud_t pud_mkspecial(pud_t pud) >>> +{ >>> + return pud; >>> +} >>> +#endif /* CONFIG_ARCH_SUPPORTS_PUD_PFNMAP */ >>> + >>> #ifndef CONFIG_ARCH_HAS_PTE_DEVMAP >>> static inline int pte_devmap(pte_t pte) >>> { >>> diff --git a/mm/Kconfig b/mm/Kconfig >>> index 3936fe4d26d9..3db0eebb53e2 100644 >>> --- a/mm/Kconfig >>> +++ b/mm/Kconfig >>> @@ -881,6 +881,19 @@ endif # TRANSPARENT_HUGEPAGE >>> config PGTABLE_HAS_HUGE_LEAVES >>> def_bool TRANSPARENT_HUGEPAGE || HUGETLB_PAGE >>> +# TODO: Allow to be enabled without THP >>> +config ARCH_SUPPORTS_HUGE_PFNMAP >>> + def_bool n >>> + depends on TRANSPARENT_HUGEPAGE >>> + >>> +config ARCH_SUPPORTS_PMD_PFNMAP >>> + def_bool y >>> + depends on ARCH_SUPPORTS_HUGE_PFNMAP && HAVE_ARCH_TRANSPARENT_HUGEPAGE >>> + >>> +config ARCH_SUPPORTS_PUD_PFNMAP >>> + def_bool y >>> + depends on ARCH_SUPPORTS_HUGE_PFNMAP && HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD >>> + >>> # >>> # UP and nommu archs use km based percpu allocator >>> # >> >> As noted in reply to other patches, I think you have to take care of >> vm_normal_page_pmd() [if not done in another patch I am missing] and likely >> you want to introduce vm_normal_page_pud(). > > So far this patch may not have direct involvement with vm_normal_page_pud() > yet? Anyway, let's keep the discussion there, then we'll know how to move > on. vm_normal_page_pud() might make sense as of today already, primarily to wrap the pud_devmap() stuff (maybe that is gone soon, who knows). Anyhow, I can send a patch to add that as well. -- Cheers, David / dhildenb