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2a5eacca85
We also switched away from quicklists and instead moved to slab caches. After benchmarking both implementations the difference is negligible. The slab caches suit us better though because the size of a pgd table is just 4 entries when we're using a 3-level page table layout and quicklists always deal with pages. Signed-off-by: Matt Fleming <matt@console-pimps.org>
58 lines
1.3 KiB
C
58 lines
1.3 KiB
C
#include <linux/mm.h>
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#define PGALLOC_GFP GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO
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static struct kmem_cache *pgd_cachep;
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#ifdef CONFIG_PGTABLE_LEVELS_3
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static struct kmem_cache *pmd_cachep;
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#endif
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void pgd_ctor(void *x)
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{
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pgd_t *pgd = x;
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memcpy(pgd + USER_PTRS_PER_PGD,
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swapper_pg_dir + USER_PTRS_PER_PGD,
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(PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
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}
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void pgtable_cache_init(void)
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{
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pgd_cachep = kmem_cache_create("pgd_cache",
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PTRS_PER_PGD * (1<<PTE_MAGNITUDE),
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PAGE_SIZE, SLAB_PANIC, pgd_ctor);
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#ifdef CONFIG_PGTABLE_LEVELS_3
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pmd_cachep = kmem_cache_create("pmd_cache",
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PTRS_PER_PMD * (1<<PTE_MAGNITUDE),
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PAGE_SIZE, SLAB_PANIC, NULL);
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#endif
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}
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pgd_t *pgd_alloc(struct mm_struct *mm)
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{
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return kmem_cache_alloc(pgd_cachep, PGALLOC_GFP);
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}
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void pgd_free(struct mm_struct *mm, pgd_t *pgd)
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{
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kmem_cache_free(pgd_cachep, pgd);
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}
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#ifdef CONFIG_PGTABLE_LEVELS_3
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void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
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{
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set_pud(pud, __pud((unsigned long)pmd));
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}
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pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
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{
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return kmem_cache_alloc(pmd_cachep, PGALLOC_GFP);
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}
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void pmd_free(struct mm_struct *mm, pmd_t *pmd)
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{
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kmem_cache_free(pmd_cachep, pmd);
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}
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#endif /* CONFIG_PGTABLE_LEVELS_3 */
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