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Commit 5a4d5292 authored by Haavard Skinnemoen's avatar Haavard Skinnemoen
Browse files

avr32: Use a quicklist for PGD allocation 



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: default avatarHaavard Skinnemoen <haavard.skinnemoen@atmel.com>
parent a9a934f2

arch/avr32/Kconfig

+3 −0
Original line number Diff line number Diff line
@@ -147,6 +147,9 @@ config PHYS_OFFSET 


source "kernel/Kconfig.preempt"



config QUICKLIST

	def_bool y



config HAVE_ARCH_BOOTMEM_NODE

	def_bool n

include/asm-avr32/pgalloc.h

+20 −12
Original line number Diff line number Diff line
@@ -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)



/*

 * Allocate and free page tables

 */

static inline pgd_t *pgd_alloc(struct mm_struct *mm)

static inline void pgd_ctor(void *x)

{

	pgd_t *pgd;

	pgd_t *pgd = x;



	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;

/*

 * Allocate and free page tables

 */

static inline pgd_t *pgd_alloc(struct mm_struct *mm)

{

	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 */