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avr32: Use a quicklist for PGD allocation

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Use a quicklist to allocate process PGDs. This is expected to be
slightly faster since we need to copy entries from swapper_pg_dir,
which can stay around for pages on the PGD quick list.

Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
This commit is contained in:
Haavard Skinnemoen
2008-01-14 23:33:44 +01:00
parent a9a934f278
commit 5a4d529277
2 changed files with 23 additions and 12 deletions
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3
arch/avr32/Kconfig
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@@ -147,6 +147,9 @@ config PHYS_OFFSET
source "kernel/Kconfig.preempt" source "kernel/Kconfig.preempt"
config QUICKLIST
def_bool y
config HAVE_ARCH_BOOTMEM_NODE config HAVE_ARCH_BOOTMEM_NODE
def_bool n def_bool n

32
include/asm-avr32/pgalloc.h
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@@ -8,7 +8,11 @@
#ifndef __ASM_AVR32_PGALLOC_H #ifndef __ASM_AVR32_PGALLOC_H
#define __ASM_AVR32_PGALLOC_H #define __ASM_AVR32_PGALLOC_H
#include <linux/mm.h> #include <linux/quicklist.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#define QUICK_PGD 0 /* Preserve kernel mappings over free */
static inline void pmd_populate_kernel(struct mm_struct *mm, static inline void pmd_populate_kernel(struct mm_struct *mm,
pmd_t *pmd, pte_t *pte) pmd_t *pmd, pte_t *pte)
@@ -23,25 +27,26 @@ static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
} }
#define pmd_pgtable(pmd) pmd_page(pmd) #define pmd_pgtable(pmd) pmd_page(pmd)
static inline void pgd_ctor(void *x)
{
pgd_t *pgd = x;
memcpy(pgd + USER_PTRS_PER_PGD,
swapper_pg_dir + USER_PTRS_PER_PGD,
(PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
}
/* /*
* Allocate and free page tables * Allocate and free page tables
*/ */
static inline pgd_t *pgd_alloc(struct mm_struct *mm) static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{ {
pgd_t *pgd; return quicklist_alloc(QUICK_PGD, GFP_KERNEL | __GFP_REPEAT, pgd_ctor);
pgd = (pgd_t *)get_zeroed_page(GFP_KERNEL | __GFP_REPEAT);
if (likely(pgd))
memcpy(pgd + USER_PTRS_PER_PGD,
swapper_pg_dir + USER_PTRS_PER_PGD,
(PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
return pgd;
} }
static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
{ {
free_page((unsigned long)pgd); quicklist_free(QUICK_PGD, NULL, pgd);
} }
static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
@@ -83,6 +88,9 @@ do { \
tlb_remove_page((tlb), pte); \ tlb_remove_page((tlb), pte); \
} while (0) } while (0)
#define check_pgt_cache() do { } while(0) static inline void check_pgt_cache(void)
{
quicklist_trim(QUICK_PGD, NULL, 25, 16);
}
#endif /* __ASM_AVR32_PGALLOC_H */ #endif /* __ASM_AVR32_PGALLOC_H */