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>

2 files changed, 23 insertions, 12 deletions

diff --git a/arch/avr32/Kconfig b/arch/avr32/Kconfig
index 09ad7995080c..a5793c13f50c 100644
--- a/arch/avr32/Kconfig
+++ b/arch/avr32/Kconfig
@@ -147,6 +147,9 @@ config PHYS_OFFSET
 
 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 e9636d1f383f..a291f59659cf 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 @@ 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 */