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Mon, 24 Jul 2023 21:21:10 -0700 (PDT) Received: from unknowna0e70b2ca394.attlocal.net ([2600:1700:2f7d:1800::16]) by smtp.googlemail.com with ESMTPSA id h9-20020a25b189000000b00d0db687ef48sm1175540ybj.61.2023.07.24.21.21.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 24 Jul 2023 21:21:10 -0700 (PDT) From: "Vishal Moola (Oracle)" To: Andrew Morton , Matthew Wilcox Cc: linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-openrisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, xen-devel@lists.xenproject.org, kvm@vger.kernel.org, Hugh Dickins , "Vishal Moola (Oracle)" , Mike Rapoport Subject: [PATCH mm-unstable v7 02/31] pgtable: Create struct ptdesc Date: Mon, 24 Jul 2023 21:20:22 -0700 Message-Id: <20230725042051.36691-3-vishal.moola@gmail.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230725042051.36691-1-vishal.moola@gmail.com> References: <20230725042051.36691-1-vishal.moola@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: jpjtuoukajuwsarfs5cbj4r4m1cxe8y3 X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 04099C000C X-Rspam-User: X-HE-Tag: 1690258871-552603 X-HE-Meta: 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 Y+TN5yjD 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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: Currently, page table information is stored within struct page. As part of simplifying struct page, create struct ptdesc for page table information. Signed-off-by: Vishal Moola (Oracle) Acked-by: Mike Rapoport (IBM) --- include/linux/pgtable.h | 71 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 71 insertions(+) diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h index 5f36c055794b..1f92514d54b0 100644 --- a/include/linux/pgtable.h +++ b/include/linux/pgtable.h @@ -993,6 +993,77 @@ static inline void ptep_modify_prot_commit(struct vm_area_struct *vma, #endif /* __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION */ #endif /* CONFIG_MMU */ + +/** + * struct ptdesc - Memory descriptor for page tables. + * @__page_flags: Same as page flags. Unused for page tables. + * @pt_rcu_head: For freeing page table pages. + * @pt_list: List of used page tables. Used for s390 and x86. + * @_pt_pad_1: Padding that aliases with page's compound head. + * @pmd_huge_pte: Protected by ptdesc->ptl, used for THPs. + * @__page_mapping: Aliases with page->mapping. Unused for page tables. + * @pt_mm: Used for x86 pgds. + * @pt_frag_refcount: For fragmented page table tracking. Powerpc and s390 only. + * @_pt_pad_2: Padding to ensure proper alignment. + * @ptl: Lock for the page table. + * @__page_type: Same as page->page_type. Unused for page tables. + * @_refcount: Same as page refcount. Used for s390 page tables. + * @pt_memcg_data: Memcg data. Tracked for page tables here. + * + * This struct overlays struct page for now. Do not modify without a good + * understanding of the issues. + */ +struct ptdesc { + unsigned long __page_flags; + + union { + struct rcu_head pt_rcu_head; + struct list_head pt_list; + struct { + unsigned long _pt_pad_1; + pgtable_t pmd_huge_pte; + }; + }; + unsigned long __page_mapping; + + union { + struct mm_struct *pt_mm; + atomic_t pt_frag_refcount; + }; + + union { + unsigned long _pt_pad_2; +#if ALLOC_SPLIT_PTLOCKS + spinlock_t *ptl; +#else + spinlock_t ptl; +#endif + }; + unsigned int __page_type; + atomic_t _refcount; +#ifdef CONFIG_MEMCG + unsigned long pt_memcg_data; +#endif +}; + +#define TABLE_MATCH(pg, pt) \ + static_assert(offsetof(struct page, pg) == offsetof(struct ptdesc, pt)) +TABLE_MATCH(flags, __page_flags); +TABLE_MATCH(compound_head, pt_list); +TABLE_MATCH(compound_head, _pt_pad_1); +TABLE_MATCH(pmd_huge_pte, pmd_huge_pte); +TABLE_MATCH(mapping, __page_mapping); +TABLE_MATCH(pt_mm, pt_mm); +TABLE_MATCH(ptl, ptl); +TABLE_MATCH(rcu_head, pt_rcu_head); +TABLE_MATCH(page_type, __page_type); +TABLE_MATCH(_refcount, _refcount); +#ifdef CONFIG_MEMCG +TABLE_MATCH(memcg_data, pt_memcg_data); +#endif +#undef TABLE_MATCH +static_assert(sizeof(struct ptdesc) <= sizeof(struct page)); + /* * No-op macros that just return the current protection value. Defined here * because these macros can be used even if CONFIG_MMU is not defined. -- 2.40.1