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>
88 lines
1.9 KiB
C
88 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* linux/arch/unicore32/include/asm/pgalloc.h
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*
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* Code specific to PKUnity SoC and UniCore ISA
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*
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* Copyright (C) 2001-2010 GUAN Xue-tao
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*/
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#ifndef __UNICORE_PGALLOC_H__
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#define __UNICORE_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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#define __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
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#define __HAVE_ARCH_PTE_ALLOC_ONE
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#include <asm-generic/pgalloc.h>
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#define _PAGE_USER_TABLE (PMD_TYPE_TABLE | PMD_PRESENT)
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#define _PAGE_KERNEL_TABLE (PMD_TYPE_TABLE | PMD_PRESENT)
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extern pgd_t *get_pgd_slow(struct mm_struct *mm);
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extern void free_pgd_slow(struct mm_struct *mm, pgd_t *pgd);
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#define pgd_alloc(mm) get_pgd_slow(mm)
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#define pgd_free(mm, pgd) free_pgd_slow(mm, pgd)
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/*
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* Allocate one PTE table.
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*/
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static inline pte_t *
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pte_alloc_one_kernel(struct mm_struct *mm)
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{
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pte_t *pte = __pte_alloc_one_kernel(mm);
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if (pte)
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clean_dcache_area(pte, PTRS_PER_PTE * sizeof(pte_t));
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return pte;
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}
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static inline pgtable_t
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pte_alloc_one(struct mm_struct *mm)
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{
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struct page *pte;
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pte = __pte_alloc_one(mm, GFP_PGTABLE_USER);
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if (!pte)
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return NULL;
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if (!PageHighMem(pte))
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clean_pte_table(page_address(pte));
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return pte;
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}
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static inline void __pmd_populate(pmd_t *pmdp, unsigned long pmdval)
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{
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set_pmd(pmdp, __pmd(pmdval));
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flush_pmd_entry(pmdp);
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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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unsigned long pte_ptr = (unsigned long)ptep;
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/*
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* The pmd must be loaded with the physical
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* address of the PTE table
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*/
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__pmd_populate(pmdp, __pa(pte_ptr) | _PAGE_KERNEL_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,
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page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_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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