slub: Fix up comments

Provide comments and fix up various spelling / style issues.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

2 files changed, 30 insertions, 23 deletions

diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index 57deecc79d52..b00c1c73eb0a 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -61,7 +61,7 @@ struct kmem_cache {
         int size;               /* The size of an object including meta data */
         int objsize;            /* The size of an object without meta data */
         int offset;             /* Free pointer offset. */
-        int order;
+        int order;              /* Current preferred allocation order */
 
         /*
          * Avoid an extra cache line for UP, SMP and for the node local to
@@ -138,11 +138,11 @@ static __always_inline int kmalloc_index(size_t size)
         if (size <=        512) return 9;
         if (size <=       1024) return 10;
         if (size <=   2 * 1024) return 11;
+        if (size <=   4 * 1024) return 12;
 /*
  * The following is only needed to support architectures with a larger page
  * size than 4k.
  */
-        if (size <=   4 * 1024) return 12;
         if (size <=   8 * 1024) return 13;
         if (size <=  16 * 1024) return 14;
         if (size <=  32 * 1024) return 15;
diff --git a/mm/slub.c b/mm/slub.c
index 72f5f4ecd1d2..10d546954efa 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -291,6 +291,7 @@ static inline struct kmem_cache_cpu *get_cpu_slab(struct kmem_cache *s, int cpu)
 #endif
 }
 
+/* Verify that a pointer has an address that is valid within a slab page */
 static inline int check_valid_pointer(struct kmem_cache *s,
                                 struct page *page, const void *object)
 {
@@ -619,7 +620,7 @@ static int check_bytes_and_report(struct kmem_cache *s, struct page *page,
  *      A. Free pointer (if we cannot overwrite object on free)
  *      B. Tracking data for SLAB_STORE_USER
  *      C. Padding to reach required alignment boundary or at mininum
- *              one word if debuggin is on to be able to detect writes
+ *              one word if debugging is on to be able to detect writes
  *              before the word boundary.
  *
  *      Padding is done using 0x5a (POISON_INUSE)
@@ -1268,7 +1269,7 @@ static struct page *get_any_partial(struct kmem_cache *s, gfp_t flags)
          * may return off node objects because partial slabs are obtained
          * from other nodes and filled up.
          *
-         * If /sys/slab/xx/defrag_ratio is set to 100 (which makes
+         * If /sys/kernel/slab/xx/defrag_ratio is set to 100 (which makes
          * defrag_ratio = 1000) then every (well almost) allocation will
          * first attempt to defrag slab caches on other nodes. This means
          * scanning over all nodes to look for partial slabs which may be
@@ -1343,9 +1344,11 @@ static void unfreeze_slab(struct kmem_cache *s, struct page *page, int tail)
                          * Adding an empty slab to the partial slabs in order
                          * to avoid page allocator overhead. This slab needs
                          * to come after the other slabs with objects in
-                         * order to fill them up. That way the size of the
-                         * partial list stays small. kmem_cache_shrink can
-                         * reclaim empty slabs from the partial list.
+                         * so that the others get filled first. That way the
+                         * size of the partial list stays small.
+                         *
+                         * kmem_cache_shrink can reclaim any empty slabs from the
+                         * partial list.
                          */
                         add_partial(n, page, 1);
                         slab_unlock(page);
@@ -1368,7 +1371,7 @@ static void deactivate_slab(struct kmem_cache *s, struct kmem_cache_cpu *c)
         if (c->freelist)
                 stat(c, DEACTIVATE_REMOTE_FREES);
         /*
-         * Merge cpu freelist into freelist. Typically we get here
+         * Merge cpu freelist into slab freelist. Typically we get here
          * because both freelists are empty. So this is unlikely
          * to occur.
          */
@@ -1399,6 +1402,7 @@ static inline void flush_slab(struct kmem_cache *s, struct kmem_cache_cpu *c)
 
 /*
  * Flush cpu slab.
+ *
  * Called from IPI handler with interrupts disabled.
  */
 static inline void __flush_cpu_slab(struct kmem_cache *s, int cpu)
@@ -1457,7 +1461,8 @@ static inline int node_match(struct kmem_cache_cpu *c, int node)
  * rest of the freelist to the lockless freelist.
  *
  * And if we were unable to get a new slab from the partial slab lists then
- * we need to allocate a new slab. This is slowest path since we may sleep.
+ * we need to allocate a new slab. This is the slowest path since it involves
+ * a call to the page allocator and the setup of a new slab.
  */
 static void *__slab_alloc(struct kmem_cache *s,
                 gfp_t gfpflags, int node, void *addr, struct kmem_cache_cpu *c)
@@ -1471,7 +1476,9 @@ static void *__slab_alloc(struct kmem_cache *s,
         slab_lock(c->page);
         if (unlikely(!node_match(c, node)))
                 goto another_slab;
+
         stat(c, ALLOC_REFILL);
+
 load_freelist:
         object = c->page->freelist;
         if (unlikely(!object))
@@ -1616,6 +1623,7 @@ static void __slab_free(struct kmem_cache *s, struct page *page,
 
         if (unlikely(SlabDebug(page)))
                 goto debug;
+
 checks_ok:
         prior = object[offset] = page->freelist;
         page->freelist = object;
@@ -1630,8 +1638,7 @@ checks_ok:
                 goto slab_empty;
 
         /*
-         * Objects left in the slab. If it
-         * was not on the partial list before
+         * Objects left in the slab. If it was not on the partial list before
          * then add it.
          */
         if (unlikely(!prior)) {
@@ -1845,13 +1852,11 @@ static unsigned long calculate_alignment(unsigned long flags,
                 unsigned long align, unsigned long size)
 {
         /*
-         * If the user wants hardware cache aligned objects then
-         * follow that suggestion if the object is sufficiently
-         * large.
+         * If the user wants hardware cache aligned objects then follow that
+         * suggestion if the object is sufficiently large.
          *
-         * The hardware cache alignment cannot override the
-         * specified alignment though. If that is greater
-         * then use it.
+         * The hardware cache alignment cannot override the specified
+         * alignment though. If that is greater then use it.
          */
         if ((flags & SLAB_HWCACHE_ALIGN) &&
                         size > cache_line_size() / 2)
@@ -2049,6 +2054,7 @@ static struct kmem_cache_node *early_kmem_cache_node_alloc(gfp_t gfpflags,
 #endif
         init_kmem_cache_node(n);
         atomic_long_inc(&n->nr_slabs);
+
         /*
          * lockdep requires consistent irq usage for each lock
          * so even though there cannot be a race this early in
@@ -2301,7 +2307,7 @@ int kmem_ptr_validate(struct kmem_cache *s, const void *object)
         /*
          * We could also check if the object is on the slabs freelist.
          * But this would be too expensive and it seems that the main
-         * purpose of kmem_ptr_valid is to check if the object belongs
+         * purpose of kmem_ptr_valid() is to check if the object belongs
          * to a certain slab.
          */
         return 1;
@@ -2913,7 +2919,7 @@ void __init kmem_cache_init(void)
         /*
          * Patch up the size_index table if we have strange large alignment
          * requirements for the kmalloc array. This is only the case for
-         * mips it seems. The standard arches will not generate any code here.
+         * MIPS it seems. The standard arches will not generate any code here.
          *
          * Largest permitted alignment is 256 bytes due to the way we
          * handle the index determination for the smaller caches.
@@ -2942,7 +2948,6 @@ void __init kmem_cache_init(void)
         kmem_size = sizeof(struct kmem_cache);
 #endif
 
-
         printk(KERN_INFO
                 "SLUB: Genslabs=%d, HWalign=%d, Order=%d-%d, MinObjects=%d,"
                 " CPUs=%d, Nodes=%d\n",
@@ -3039,12 +3044,15 @@ struct kmem_cache *kmem_cache_create(const char *name, size_t size,
                  */
                 for_each_online_cpu(cpu)
                         get_cpu_slab(s, cpu)->objsize = s->objsize;
+
                 s->inuse = max_t(int, s->inuse, ALIGN(size, sizeof(void *)));
                 up_write(&slub_lock);
+
                 if (sysfs_slab_alias(s, name))
                         goto err;
                 return s;
         }
+
         s = kmalloc(kmem_size, GFP_KERNEL);
         if (s) {
                 if (kmem_cache_open(s, GFP_KERNEL, name,
@@ -3927,7 +3935,6 @@ SLAB_ATTR(remote_node_defrag_ratio);
 #endif
 
 #ifdef CONFIG_SLUB_STATS
-
 static int show_stat(struct kmem_cache *s, char *buf, enum stat_item si)
 {
         unsigned long sum  = 0;
@@ -4111,8 +4118,8 @@ static struct kset *slab_kset;
 #define ID_STR_LENGTH 64
 
 /* Create a unique string id for a slab cache:
- * format
- * :[flags-]size:[memory address of kmemcache]
+ *
+ * Format       :[flags-]size
  */
 static char *create_unique_id(struct kmem_cache *s)
 {