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13224794cb
Patch series "mm: remove quicklist page table caches". A while ago Nicholas proposed to remove quicklist page table caches [1]. I've rebased his patch on the curren upstream and switched ia64 and sh to use generic versions of PTE allocation. [1] https://lore.kernel.org/linux-mm/20190711030339.20892-1-npiggin@gmail.com This patch (of 3): Remove page table allocator "quicklists". These have been around for a long time, but have not got much traction in the last decade and are only used on ia64 and sh architectures. The numbers in the initial commit look interesting but probably don't apply anymore. If anybody wants to resurrect this it's in the git history, but it's unhelpful to have this code and divergent allocator behaviour for minor archs. Also it might be better to instead make more general improvements to page allocator if this is still so slow. Link: http://lkml.kernel.org/r/1565250728-21721-2-git-send-email-rppt@linux.ibm.com Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Cc: Tony Luck <tony.luck@intel.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
121 lines
2.9 KiB
C
121 lines
2.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Based on arch/arm/include/asm/pgalloc.h
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*
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* Copyright (C) 2000-2001 Russell King
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* Copyright (C) 2012 ARM Ltd.
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*/
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#ifndef __ASM_PGALLOC_H
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#define __ASM_PGALLOC_H
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#include <asm/pgtable-hwdef.h>
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#include <asm/processor.h>
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#include <asm/cacheflush.h>
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#include <asm/tlbflush.h>
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#include <asm-generic/pgalloc.h> /* for pte_{alloc,free}_one */
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#define PGD_SIZE (PTRS_PER_PGD * sizeof(pgd_t))
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#if CONFIG_PGTABLE_LEVELS > 2
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static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
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{
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gfp_t gfp = GFP_PGTABLE_USER;
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struct page *page;
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if (mm == &init_mm)
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gfp = GFP_PGTABLE_KERNEL;
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page = alloc_page(gfp);
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if (!page)
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return NULL;
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if (!pgtable_pmd_page_ctor(page)) {
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__free_page(page);
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return NULL;
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}
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return page_address(page);
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}
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static inline void pmd_free(struct mm_struct *mm, pmd_t *pmdp)
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{
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BUG_ON((unsigned long)pmdp & (PAGE_SIZE-1));
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pgtable_pmd_page_dtor(virt_to_page(pmdp));
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free_page((unsigned long)pmdp);
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}
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static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot)
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{
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set_pud(pudp, __pud(__phys_to_pud_val(pmdp) | prot));
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}
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static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmdp)
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{
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__pud_populate(pudp, __pa(pmdp), PMD_TYPE_TABLE);
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}
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#else
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static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot)
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{
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BUILD_BUG();
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}
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#endif /* CONFIG_PGTABLE_LEVELS > 2 */
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#if CONFIG_PGTABLE_LEVELS > 3
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static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
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{
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return (pud_t *)__get_free_page(GFP_PGTABLE_USER);
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}
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static inline void pud_free(struct mm_struct *mm, pud_t *pudp)
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{
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BUG_ON((unsigned long)pudp & (PAGE_SIZE-1));
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free_page((unsigned long)pudp);
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}
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static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pudp, pgdval_t prot)
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{
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set_pgd(pgdp, __pgd(__phys_to_pgd_val(pudp) | prot));
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}
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static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgdp, pud_t *pudp)
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{
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__pgd_populate(pgdp, __pa(pudp), PUD_TYPE_TABLE);
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}
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#else
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static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pudp, pgdval_t prot)
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{
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BUILD_BUG();
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}
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#endif /* CONFIG_PGTABLE_LEVELS > 3 */
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extern pgd_t *pgd_alloc(struct mm_struct *mm);
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extern void pgd_free(struct mm_struct *mm, pgd_t *pgdp);
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static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t ptep,
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pmdval_t prot)
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{
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set_pmd(pmdp, __pmd(__phys_to_pmd_val(ptep) | prot));
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}
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/*
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* Populate the pmdp entry with a pointer to the pte. This pmd is part
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* of the mm address space.
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*/
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static inline void
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pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
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{
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/*
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* The pmd must be loaded with the physical address of the PTE table
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*/
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__pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE);
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}
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static inline void
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pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
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{
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__pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE);
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}
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#define pmd_pgtable(pmd) pmd_page(pmd)
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#endif
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