[SPARC64]: Use SLAB caches for TSB tables.

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

1 files changed, 62 insertions, 24 deletions

diff --git a/arch/sparc64/mm/tsb.c b/arch/sparc64/mm/tsb.c
index 3eb8670282fd..1af797a0a092 100644
--- a/arch/sparc64/mm/tsb.c
+++ b/arch/sparc64/mm/tsb.c
@@ -11,6 +11,7 @@
 #include <asm/mmu_context.h>
 #include <asm/pgtable.h>
 #include <asm/tsb.h>
+#include <asm/oplib.h>
 
 extern struct tsb swapper_tsb[KERNEL_TSB_NENTRIES];
 
@@ -207,6 +208,39 @@ static void setup_tsb_params(struct mm_struct *mm, unsigned long tsb_bytes)
         }
 }
 
+static kmem_cache_t *tsb_caches[8] __read_mostly;
+
+static const char *tsb_cache_names[8] = {
+        "tsb_8KB",
+        "tsb_16KB",
+        "tsb_32KB",
+        "tsb_64KB",
+        "tsb_128KB",
+        "tsb_256KB",
+        "tsb_512KB",
+        "tsb_1MB",
+};
+
+void __init tsb_cache_init(void)
+{
+        unsigned long i;
+
+        for (i = 0; i < 8; i++) {
+                unsigned long size = 8192 << i;
+                const char *name = tsb_cache_names[i];
+
+                tsb_caches[i] = kmem_cache_create(name,
+                                                  size, size,
+                                                  SLAB_HWCACHE_ALIGN |
+                                                  SLAB_MUST_HWCACHE_ALIGN,
+                                                  NULL, NULL);
+                if (!tsb_caches[i]) {
+                        prom_printf("Could not create %s cache\n", name);
+                        prom_halt();
+                }
+        }
+}
+
 /* When the RSS of an address space exceeds mm->context.tsb_rss_limit,
  * do_sparc64_fault() invokes this routine to try and grow the TSB.
  *
@@ -226,45 +260,48 @@ static void setup_tsb_params(struct mm_struct *mm, unsigned long tsb_bytes)
 void tsb_grow(struct mm_struct *mm, unsigned long rss)
 {
         unsigned long max_tsb_size = 1 * 1024 * 1024;
-        unsigned long size, old_size, flags;
-        struct page *page;
+        unsigned long new_size, old_size, flags;
         struct tsb *old_tsb, *new_tsb;
-        unsigned long order, new_rss_limit;
+        unsigned long new_cache_index, old_cache_index;
+        unsigned long new_rss_limit;
         gfp_t gfp_flags;
 
         if (max_tsb_size > (PAGE_SIZE << MAX_ORDER))
                 max_tsb_size = (PAGE_SIZE << MAX_ORDER);
 
-        for (size = PAGE_SIZE; size < max_tsb_size; size <<= 1UL) {
-                unsigned long n_entries = size / sizeof(struct tsb);
+        new_cache_index = 0;
+        for (new_size = 8192; new_size < max_tsb_size; new_size <<= 1UL) {
+                unsigned long n_entries = new_size / sizeof(struct tsb);
 
                 n_entries = (n_entries * 3) / 4;
                 if (n_entries > rss)
                         break;
+
+                new_cache_index++;
         }
 
-        if (size == max_tsb_size)
+        if (new_size == max_tsb_size)
                 new_rss_limit = ~0UL;
         else
-                new_rss_limit = ((size / sizeof(struct tsb)) * 3) / 4;
+                new_rss_limit = ((new_size / sizeof(struct tsb)) * 3) / 4;
 
-retry_page_alloc:
-        order = get_order(size);
+retry_tsb_alloc:
         gfp_flags = GFP_KERNEL;
-        if (order > 1)
+        if (new_size > (PAGE_SIZE * 2))
                 gfp_flags = __GFP_NOWARN | __GFP_NORETRY;
 
-        page = alloc_pages(gfp_flags, order);
-        if (unlikely(!page)) {
+        new_tsb = kmem_cache_alloc(tsb_caches[new_cache_index], gfp_flags);
+        if (unlikely(!new_tsb)) {
                 /* Not being able to fork due to a high-order TSB
                  * allocation failure is very bad behavior.  Just back
                  * down to a 0-order allocation and force no TSB
                  * growing for this address space.
                  */
-                if (mm->context.tsb == NULL && order > 0) {
-                        size = PAGE_SIZE;
+                if (mm->context.tsb == NULL && new_cache_index > 0) {
+                        new_cache_index = 0;
+                        new_size = 8192;
                         new_rss_limit = ~0UL;
-                        goto retry_page_alloc;
+                        goto retry_tsb_alloc;
                 }
 
                 /* If we failed on a TSB grow, we are under serious
@@ -276,8 +313,7 @@ retry_page_alloc:
         }
 
         /* Mark all tags as invalid.  */
-        new_tsb = page_address(page);
-        memset(new_tsb, 0x40, size);
+        memset(new_tsb, 0x40, new_size);
 
         /* Ok, we are about to commit the changes.  If we are
          * growing an existing TSB the locking is very tricky,
@@ -304,8 +340,10 @@ retry_page_alloc:
         spin_lock_irqsave(&mm->context.lock, flags);
 
         old_tsb = mm->context.tsb;
+        old_cache_index = (mm->context.tsb_reg_val & 0x7UL);
         old_size = mm->context.tsb_nentries * sizeof(struct tsb);
 
+
         /* Handle multiple threads trying to grow the TSB at the same time.
          * One will get in here first, and bump the size and the RSS limit.
          * The others will get in here next and hit this check.
@@ -313,7 +351,7 @@ retry_page_alloc:
         if (unlikely(old_tsb && (rss < mm->context.tsb_rss_limit))) {
                 spin_unlock_irqrestore(&mm->context.lock, flags);
 
-                free_pages((unsigned long) new_tsb, get_order(size));
+                kmem_cache_free(tsb_caches[new_cache_index], new_tsb);
                 return;
         }
 
@@ -331,11 +369,11 @@ retry_page_alloc:
                         old_tsb_base = __pa(old_tsb_base);
                         new_tsb_base = __pa(new_tsb_base);
                 }
-                copy_tsb(old_tsb_base, old_size, new_tsb_base, size);
+                copy_tsb(old_tsb_base, old_size, new_tsb_base, new_size);
         }
 
         mm->context.tsb = new_tsb;
-        setup_tsb_params(mm, size);
+        setup_tsb_params(mm, new_size);
 
         spin_unlock_irqrestore(&mm->context.lock, flags);
 
@@ -350,7 +388,7 @@ retry_page_alloc:
                 smp_tsb_sync(mm);
 
                 /* Now it is safe to free the old tsb.  */
-                free_pages((unsigned long) old_tsb, get_order(old_size));
+                kmem_cache_free(tsb_caches[old_cache_index], old_tsb);
         }
 }
 
@@ -379,10 +417,10 @@ int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
 
 void destroy_context(struct mm_struct *mm)
 {
-        unsigned long size = mm->context.tsb_nentries * sizeof(struct tsb);
-        unsigned long flags;
+        unsigned long flags, cache_index;
 
-        free_pages((unsigned long) mm->context.tsb, get_order(size));
+        cache_index = (mm->context.tsb_reg_val & 0x7UL);
+        kmem_cache_free(tsb_caches[cache_index], mm->context.tsb);
 
         /* We can remove these later, but for now it's useful
          * to catch any bogus post-destroy_context() references