@@ -341,10 +341,14 @@ static inline void __ptep_set_access_flags(pte_t *ptep, pte_t entry)
#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> 3 })
#define __swp_entry_to_pte(x) ((pte_t) { (x).val << 3 })
+#ifndef CONFIG_PPC_4K_PAGES
+void pgtable_cache_init(void);
+#else
/*
* No page table caches to initialise
*/
#define pgtable_cache_init() do { } while (0)
+#endif
extern int get_pteptr(struct mm_struct *mm, unsigned long addr, pte_t **ptep,
pmd_t **pmdp);
@@ -73,13 +73,25 @@ extern unsigned long p_mapped_by_tlbcam(phys_addr_t pa);
#define PGDIR_ORDER (32 + PGD_T_LOG2 - PGDIR_SHIFT)
+#ifndef CONFIG_PPC_4K_PAGES
+static struct kmem_cache *pgtable_cache;
+
+void pgtable_cache_init(void)
+{
+ pgtable_cache = kmem_cache_create("PGDIR cache", 1 << PGDIR_ORDER,
+ 1 << PGDIR_ORDER, 0, NULL);
+ if (pgtable_cache == NULL)
+ panic("Couldn't allocate pgtable caches");
+}
+#endif
+
pgd_t *pgd_alloc(struct mm_struct *mm)
{
pgd_t *ret;
/* pgdir take page or two with 4K pages and a page fraction otherwise */
#ifndef CONFIG_PPC_4K_PAGES
- ret = kzalloc(1 << PGDIR_ORDER, GFP_KERNEL);
+ ret = kmem_cache_alloc(pgtable_cache, GFP_KERNEL | __GFP_ZERO);
#else
ret = (pgd_t *)__get_free_pages(GFP_KERNEL|__GFP_ZERO,
PGDIR_ORDER - PAGE_SHIFT);
@@ -90,7 +102,7 @@ pgd_t *pgd_alloc(struct mm_struct *mm)
void pgd_free(struct mm_struct *mm, pgd_t *pgd)
{
#ifndef CONFIG_PPC_4K_PAGES
- kfree((void *)pgd);
+ kmem_cache_free(pgtable_cache, (void *)pgd);
#else
free_pages((unsigned long)pgd, PGDIR_ORDER - PAGE_SHIFT);
#endif
When pages are not 4K, PGDIR table is allocated with kmalloc(). In order to optimise TLB handlers, aligned memory is needed. kmalloc() doesn't provide aligned memory blocks, so lets use a kmem_cache pool instead. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> --- v2: changed to apply cleanly to linux-next (due to patch ab090dc) arch/powerpc/include/asm/pgtable-ppc32.h | 4 ++++ arch/powerpc/mm/pgtable_32.c | 16 ++++++++++++++-- 2 files changed, 18 insertions(+), 2 deletions(-)