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: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
diff --git a/arch/avr32/Kconfig b/arch/avr32/Kconfig
index 09ad799..a5793c1 100644
--- a/arch/avr32/Kconfig
+++ b/arch/avr32/Kconfig
@@ -147,6 +147,9 @@
source "kernel/Kconfig.preempt"
+config QUICKLIST
+ def_bool y
+
config HAVE_ARCH_BOOTMEM_NODE
def_bool n
diff --git a/include/asm-avr32/pgalloc.h b/include/asm-avr32/pgalloc.h
index e9636d1..a291f59 100644
--- a/include/asm-avr32/pgalloc.h
+++ b/include/asm-avr32/pgalloc.h
@@ -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 @@
}
#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 @@
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 */