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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>
106 lines
2.5 KiB
C
106 lines
2.5 KiB
C
/*
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* Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
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* Copyright (C) 2008-2009 PetaLogix
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* Copyright (C) 2006 Atmark Techno, Inc.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#ifndef _ASM_MICROBLAZE_PGALLOC_H
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#define _ASM_MICROBLAZE_PGALLOC_H
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#ifdef CONFIG_MMU
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#include <linux/kernel.h> /* For min/max macros */
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#include <linux/highmem.h>
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#include <asm/setup.h>
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#include <asm/io.h>
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#include <asm/page.h>
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#include <asm/cache.h>
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#include <asm/pgtable.h>
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extern void __bad_pte(pmd_t *pmd);
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static inline pgd_t *get_pgd(void)
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{
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return (pgd_t *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, 0);
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}
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static inline void free_pgd(pgd_t *pgd)
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{
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free_page((unsigned long)pgd);
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}
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#define pgd_free(mm, pgd) free_pgd(pgd)
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#define pgd_alloc(mm) get_pgd()
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#define pmd_pgtable(pmd) pmd_page(pmd)
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/*
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* We don't have any real pmd's, and this code never triggers because
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* the pgd will always be present..
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*/
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#define pmd_alloc_one_fast(mm, address) ({ BUG(); ((pmd_t *)1); })
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#define pmd_alloc_one(mm, address) ({ BUG(); ((pmd_t *)2); })
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extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm);
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static inline struct page *pte_alloc_one(struct mm_struct *mm)
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{
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struct page *ptepage;
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#ifdef CONFIG_HIGHPTE
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int flags = GFP_KERNEL | __GFP_ZERO | __GFP_HIGHMEM;
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#else
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int flags = GFP_KERNEL | __GFP_ZERO;
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#endif
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ptepage = alloc_pages(flags, 0);
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if (!ptepage)
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return NULL;
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if (!pgtable_page_ctor(ptepage)) {
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__free_page(ptepage);
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return NULL;
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}
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return ptepage;
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}
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static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
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{
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free_page((unsigned long)pte);
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}
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static inline void pte_free_slow(struct page *ptepage)
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{
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__free_page(ptepage);
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}
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static inline void pte_free(struct mm_struct *mm, struct page *ptepage)
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{
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pgtable_page_dtor(ptepage);
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__free_page(ptepage);
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}
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#define __pte_free_tlb(tlb, pte, addr) pte_free((tlb)->mm, (pte))
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#define pmd_populate(mm, pmd, pte) \
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(pmd_val(*(pmd)) = (unsigned long)page_address(pte))
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#define pmd_populate_kernel(mm, pmd, pte) \
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(pmd_val(*(pmd)) = (unsigned long) (pte))
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/*
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* We don't have any real pmd's, and this code never triggers because
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* the pgd will always be present..
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*/
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#define pmd_alloc_one(mm, address) ({ BUG(); ((pmd_t *)2); })
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#define pmd_free(mm, x) do { } while (0)
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#define __pmd_free_tlb(tlb, x, addr) pmd_free((tlb)->mm, x)
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#define pgd_populate(mm, pmd, pte) BUG()
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#endif /* CONFIG_MMU */
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#endif /* _ASM_MICROBLAZE_PGALLOC_H */
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