Remove stray call to spl_cache_free() and remove all the

cycle count which was costing me overhead.  It was hurting
performance pretty badly for heavily used caches.  I'm also
thinking the hash may be hurting me as well and it might
be worth sticking a pointer in to a little space after the
alloced object.



git-svn-id: https://outreach.scidac.gov/svn/spl/trunk@140 7e1ea52c-4ff2-0310-8f11-9dd32ca42a1c

include/sys/kmem.h

@@ -538,11 +538,6 @@ typedef struct spl_kmem_cache {
 	uint64_t		skc_obj_max;	/* Obj max historic */
 	uint64_t		skc_hash_depth;	/* Lazy hash depth */
 	uint64_t		skc_hash_count;	/* Hash entries current */
-	cycles_t		skc_lock_reclaim;
-	cycles_t		skc_lock_destroy;
-	cycles_t		skc_lock_grow;
-	cycles_t		skc_lock_refill;
-	cycles_t		skc_lock_flush;
 } spl_kmem_cache_t;
 
 extern spl_kmem_cache_t *

modules/spl/spl-kmem.c

@@ -114,10 +114,6 @@ EXPORT_SYMBOL(kmem_set_warning);
  *      shrink them via spl_slab_reclaim() when they are wasting lots
  *      of space.  Currently this process is driven by the reapers.
  *
- * XXX: Implement proper small cache object support by embedding
- *      the spl_kmem_slab_t, spl_kmem_obj_t's, and objects in the
- *      allocated for a particular slab.
- *
  * XXX: Implement a resizable used object hash.  Currently the hash
  *      is statically sized for thousands of objects but it should
  *      grow based on observed worst case slab depth.
@@ -407,18 +403,13 @@ __spl_slab_reclaim(spl_kmem_cache_t *skc)
 static int
 spl_slab_reclaim(spl_kmem_cache_t *skc)
 {
-	cycles_t start;
 	int rc;
 	ENTRY;
 
 	spin_lock(&skc->skc_lock);
-        start = get_cycles();
 	rc = __spl_slab_reclaim(skc);
 	spin_unlock(&skc->skc_lock);
 
-	if (unlikely((get_cycles() - start) > skc->skc_lock_reclaim))
-		skc->skc_lock_reclaim = get_cycles() - start;
-
 	RETURN(rc);
 }
 
@@ -584,11 +575,6 @@ spl_kmem_cache_create(char *name, size_t size, size_t align,
 	skc->skc_obj_max = 0;
 	skc->skc_hash_depth = 0;
 	skc->skc_hash_count = 0;
-	skc->skc_lock_reclaim = 0;
-	skc->skc_lock_destroy = 0;
-	skc->skc_lock_grow = 0;
-	skc->skc_lock_refill = 0;
-	skc->skc_lock_flush = 0;
 
 	rc = spl_magazine_create(skc);
 	if (rc) {
@@ -613,7 +599,6 @@ void
 spl_kmem_cache_destroy(spl_kmem_cache_t *skc)
 {
         spl_kmem_slab_t *sks, *m;
-	cycles_t start;
 	ENTRY;
 
 	ASSERT(skc->skc_magic == SKC_MAGIC);
@@ -624,7 +609,6 @@ spl_kmem_cache_destroy(spl_kmem_cache_t *skc)
 
 	spl_magazine_destroy(skc);
 	spin_lock(&skc->skc_lock);
-	start = get_cycles();
 
 	/* Validate there are no objects in use and free all the
 	 * spl_kmem_slab_t, spl_kmem_obj_t, and object buffers. */
@@ -639,9 +623,6 @@ spl_kmem_cache_destroy(spl_kmem_cache_t *skc)
 	kmem_free(skc->skc_name, skc->skc_name_size);
 	spin_unlock(&skc->skc_lock);
 
-	if (unlikely((get_cycles() - start) > skc->skc_lock_destroy))
-		skc->skc_lock_destroy = get_cycles() - start;
-
 	kmem_free(skc, sizeof(*skc));
 
 	EXIT;
@@ -731,7 +712,6 @@ static spl_kmem_slab_t *
 spl_cache_grow(spl_kmem_cache_t *skc, int flags)
 {
 	spl_kmem_slab_t *sks;
-	cycles_t start;
 	ENTRY;
 
 	ASSERT(skc->skc_magic == SKC_MAGIC);
@@ -755,16 +735,11 @@ spl_cache_grow(spl_kmem_cache_t *skc, int flags)
 
 	/* Link the new empty slab in to the end of skc_partial_list */
 	spin_lock(&skc->skc_lock);
-	start = get_cycles();
 	skc->skc_slab_total++;
 	skc->skc_obj_total += sks->sks_objs;
 	list_add_tail(&sks->sks_list, &skc->skc_partial_list);
 	spin_unlock(&skc->skc_lock);
 
-	if (unlikely((get_cycles() - start) > skc->skc_lock_grow))
-		skc->skc_lock_grow = get_cycles() - start;
-
-
 	RETURN(sks);
 }
 
@@ -773,7 +748,6 @@ spl_cache_refill(spl_kmem_cache_t *skc, spl_kmem_magazine_t *skm, int flags)
 {
 	spl_kmem_slab_t *sks;
 	int rc = 0, refill;
-	cycles_t start;
 	ENTRY;
 
 	ASSERT(skc->skc_magic == SKC_MAGIC);
@@ -783,16 +757,12 @@ spl_cache_refill(spl_kmem_cache_t *skc, spl_kmem_magazine_t *skm, int flags)
 	refill = MIN(skm->skm_refill, skm->skm_size - skm->skm_avail);
 
 	spin_lock(&skc->skc_lock);
-	start = get_cycles();
 
 	while (refill > 0) {
 		/* No slabs available we must grow the cache */
 		if (list_empty(&skc->skc_partial_list)) {
 			spin_unlock(&skc->skc_lock);
 
-			if (unlikely((get_cycles()-start)>skc->skc_lock_refill))
-				skc->skc_lock_refill = get_cycles() - start;
-
 			sks = spl_cache_grow(skc, flags);
 			if (!sks)
 				GOTO(out, rc);
@@ -807,7 +777,6 @@ spl_cache_refill(spl_kmem_cache_t *skc, spl_kmem_magazine_t *skm, int flags)
 			refill = MIN(refill, skm->skm_size - skm->skm_avail);
 
 			spin_lock(&skc->skc_lock);
-			start = get_cycles();
 			continue;
 		}
 
@@ -834,9 +803,6 @@ spl_cache_refill(spl_kmem_cache_t *skc, spl_kmem_magazine_t *skm, int flags)
 	}
 
 	spin_unlock(&skc->skc_lock);
-
-	if (unlikely((get_cycles() - start) > skc->skc_lock_refill))
-		skc->skc_lock_refill = get_cycles() - start;
 out:
 	/* Returns the number of entries added to cache */
 	RETURN(rc);
@@ -892,14 +858,12 @@ static int
 spl_cache_flush(spl_kmem_cache_t *skc, spl_kmem_magazine_t *skm, int flush)
 {
 	int i, count = MIN(flush, skm->skm_avail);
-	cycles_t start;
 	ENTRY;
 
 	ASSERT(skc->skc_magic == SKC_MAGIC);
 	ASSERT(skm->skm_magic == SKM_MAGIC);
 
 	spin_lock(&skc->skc_lock);
-	start = get_cycles();
 
 	for (i = 0; i < count; i++)
 		spl_cache_shrink(skc, skm->skm_objs[i]);
@@ -911,9 +875,6 @@ spl_cache_flush(spl_kmem_cache_t *skc, spl_kmem_magazine_t *skm, int flush)
 
 	spin_unlock(&skc->skc_lock);
 
-	if (unlikely((get_cycles() - start) > skc->skc_lock_flush))
-		skc->skc_lock_flush = get_cycles() - start;
-
 	RETURN(count);
 }
 
@@ -983,7 +944,6 @@ spl_kmem_cache_free(spl_kmem_cache_t *skc, void *obj)
 	/* Per-CPU cache full, flush it to make space */
 	if (unlikely(skm->skm_avail >= skm->skm_size))
 		(void)spl_cache_flush(skc, skm, skm->skm_refill);
-		(void)spl_cache_flush(skc, skm, 1);
 
 	/* Available space in cache, use it */
 	skm->skm_objs[skm->skm_avail++] = obj;

modules/spl/spl-proc.c

@@ -578,8 +578,7 @@ slab_seq_show(struct seq_file *f, void *p)
 	spin_lock(&skc->skc_lock);
         seq_printf(f, "%-36s      ", skc->skc_name);
         seq_printf(f, "%u %u %u - %u %u %u - "
-		   "%lu %lu %lu - %lu %lu %lu - %lu %lu %lu - %lu %lu - "
+		   "%lu %lu %lu - %lu %lu %lu - %lu %lu %lu - %lu %lu\n",
-		   "%llu %llu %llu %llu %llu\n",
 		   (unsigned)skc->skc_obj_size,
 		   (unsigned)skc->skc_chunk_size,
 		   (unsigned)skc->skc_slab_size,
@@ -596,12 +595,7 @@ slab_seq_show(struct seq_file *f, void *p)
 		   (long unsigned)skc->skc_obj_alloc,
 		   (long unsigned)skc->skc_obj_max,
 		   (long unsigned)skc->skc_hash_depth,
-		   (long unsigned)skc->skc_hash_count,
+		   (long unsigned)skc->skc_hash_count);
-		   (long long unsigned)skc->skc_lock_reclaim,
-		   (long long unsigned)skc->skc_lock_destroy,
-		   (long long unsigned)skc->skc_lock_grow,
-		   (long long unsigned)skc->skc_lock_refill,
-		   (long long unsigned)skc->skc_lock_flush);
 
 	spin_unlock(&skc->skc_lock);