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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
View file

@ -147,6 +147,9 @@ config PHYS_OFFSET
source "kernel/Kconfig.preempt"
config QUICKLIST
def_bool y
config HAVE_ARCH_BOOTMEM_NODE
def_bool n

32
include/asm-avr32/pgalloc.h
View file

@ -8,7 +8,11 @@
#ifndef __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,
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)
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
*/
static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
pgd_t *pgd;
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;
return quicklist_alloc(QUICK_PGD, GFP_KERNEL | __GFP_REPEAT, pgd_ctor);
}
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,
@ -83,6 +88,9 @@ do { \
tlb_remove_page((tlb), pte); \
} 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 */