[SPARC64]: Kill pgtable quicklists and use SLAB.

Taking a nod from the powerpc port.

With the per-cpu caching of both the page allocator and SLAB, the
pgtable quicklist scheme becomes relatively silly and primitive.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 27 insertions, 131 deletions

diff --git a/include/asm-sparc64/pgalloc.h b/include/asm-sparc64/pgalloc.h
index ecea1bbdc115..12e4a273bd43 100644
--- a/include/asm-sparc64/pgalloc.h
+++ b/include/asm-sparc64/pgalloc.h
@@ -6,6 +6,7 @@
 #include <linux/kernel.h>
 #include <linux/sched.h>
 #include <linux/mm.h>
+#include <linux/slab.h>
 
 #include <asm/spitfire.h>
 #include <asm/cpudata.h>
@@ -13,164 +14,59 @@
 #include <asm/page.h>
 
 /* Page table allocation/freeing. */
-#ifdef CONFIG_SMP
-/* Sliiiicck */
-#define pgt_quicklists  local_cpu_data()
-#else
-extern struct pgtable_cache_struct {
-        unsigned long *pgd_cache;
-        unsigned long *pte_cache;
-        unsigned int pgcache_size;
-} pgt_quicklists;
-#endif
-#define pgd_quicklist           (pgt_quicklists.pgd_cache)
-#define pte_quicklist           (pgt_quicklists.pte_cache)
-#define pgtable_cache_size      (pgt_quicklists.pgcache_size)
+extern kmem_cache_t *pgtable_cache;
 
-static inline void free_pgd_fast(pgd_t *pgd)
+static inline pgd_t *pgd_alloc(struct mm_struct *mm)
 {
-        preempt_disable();
-        *(unsigned long *)pgd = (unsigned long) pgd_quicklist;
-        pgd_quicklist = (unsigned long *) pgd;
-        pgtable_cache_size++;
-        preempt_enable();
+        return kmem_cache_alloc(pgtable_cache, GFP_KERNEL);
 }
 
-static inline pgd_t *get_pgd_fast(void)
+static inline void pgd_free(pgd_t *pgd)
 {
-        unsigned long *ret;
-
-        preempt_disable();
-        if((ret = pgd_quicklist) != NULL) {
-                pgd_quicklist = (unsigned long *)(*ret);
-                ret[0] = 0;
-                pgtable_cache_size--;
-                preempt_enable();
-        } else {
-                preempt_enable();
-                ret = (unsigned long *) __get_free_page(GFP_KERNEL|__GFP_REPEAT);
-                if(ret)
-                        memset(ret, 0, PAGE_SIZE);
-        }
-        return (pgd_t *)ret;
-}
-
-static inline void free_pgd_slow(pgd_t *pgd)
-{
-        free_page((unsigned long)pgd);
+        kmem_cache_free(pgtable_cache, pgd);
 }
 
 #define pud_populate(MM, PUD, PMD)      pud_set(PUD, PMD)
 
-static inline pmd_t *pmd_alloc_one_fast(void)
-{
-        unsigned long *ret;
-
-        preempt_disable();
-        ret = (unsigned long *) pte_quicklist;
-        if (likely(ret)) {
-                pte_quicklist = (unsigned long *)(*ret);
-                ret[0] = 0;
-                pgtable_cache_size--;
-        }
-        preempt_enable();
-
-        return (pmd_t *) ret;
-}
-
-static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
-{
-        pmd_t *pmd;
-
-        pmd = pmd_alloc_one_fast();
-        if (unlikely(!pmd)) {
-                pmd = (pmd_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
-                if (pmd)
-                        memset(pmd, 0, PAGE_SIZE);
-        }
-        return pmd;
-}
-
-static inline void free_pmd_fast(pmd_t *pmd)
-{
-        preempt_disable();
-        *(unsigned long *)pmd = (unsigned long) pte_quicklist;
-        pte_quicklist = (unsigned long *) pmd;
-        pgtable_cache_size++;
-        preempt_enable();
-}
-
-static inline void free_pmd_slow(pmd_t *pmd)
-{
-        free_page((unsigned long)pmd);
-}
-
-#define pmd_populate_kernel(MM, PMD, PTE)       pmd_set(PMD, PTE)
-#define pmd_populate(MM,PMD,PTE_PAGE)           \
-        pmd_populate_kernel(MM,PMD,page_address(PTE_PAGE))
-
-static inline pte_t *pte_alloc_one_fast(void)
+static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
 {
-        unsigned long *ret;
-
-        preempt_disable();
-        ret = (unsigned long *) pte_quicklist;
-        if (likely(ret)) {
-                pte_quicklist = (unsigned long *)(*ret);
-                ret[0] = 0;
-                pgtable_cache_size--;
-        }
-        preempt_enable();
-
-        return (pte_t *) ret;
+        return kmem_cache_alloc(pgtable_cache,
+                                GFP_KERNEL|__GFP_REPEAT);
 }
 
-static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
+static inline void pmd_free(pmd_t *pmd)
 {
-        pte_t *ptep = pte_alloc_one_fast();
-
-        if (likely(ptep))
-                return ptep;
-
-        return (pte_t *) get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
+        kmem_cache_free(pgtable_cache, pmd);
 }
 
-static inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long addr)
+static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
+                                          unsigned long address)
 {
-        pte_t *pte = pte_alloc_one_fast();
-
-        if (likely(pte))
-                return virt_to_page(pte);
-
-        return alloc_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, 0);
+        return kmem_cache_alloc(pgtable_cache,
+                                GFP_KERNEL|__GFP_REPEAT);
 }
 
-static inline void free_pte_fast(pte_t *pte)
+static inline struct page *pte_alloc_one(struct mm_struct *mm,
+                                         unsigned long address)
 {
-        preempt_disable();
-        *(unsigned long *)pte = (unsigned long) pte_quicklist;
-        pte_quicklist = (unsigned long *) pte;
-        pgtable_cache_size++;
-        preempt_enable();
+        return virt_to_page(pte_alloc_one_kernel(mm, address));
 }
-
-static inline void free_pte_slow(pte_t *pte)
-{
-        free_page((unsigned long) pte);
-}
-
+                
 static inline void pte_free_kernel(pte_t *pte)
 {
-        free_pte_fast(pte);
+        kmem_cache_free(pgtable_cache, pte);
 }
 
 static inline void pte_free(struct page *ptepage)
 {
-        free_pte_fast(page_address(ptepage));
+        pte_free_kernel(page_address(ptepage));
 }
 
-#define pmd_free(pmd)           free_pmd_fast(pmd)
-#define pgd_free(pgd)           free_pgd_fast(pgd)
-#define pgd_alloc(mm)           get_pgd_fast()
+
+#define pmd_populate_kernel(MM, PMD, PTE)       pmd_set(PMD, PTE)
+#define pmd_populate(MM,PMD,PTE_PAGE)           \
+        pmd_populate_kernel(MM,PMD,page_address(PTE_PAGE))
+
+#define check_pgt_cache()       do { } while (0)
 
 #endif /* _SPARC64_PGALLOC_H */