Fix kmem memory accounting

Adjust kmem slab interface to make a copy of the slab name before
passing it on to the linux slab (we free it latter too)



git-svn-id: https://outreach.scidac.gov/svn/spl/trunk@47 7e1ea52c-4ff2-0310-8f11-9dd32ca42a1c

modules/spl/spl-generic.c

@@ -1,6 +1,7 @@
 #include <sys/sysmacros.h>
 #include <sys/vmsystm.h>
 #include <sys/vnode.h>
+#include <sys/kmem.h>
 #include "config.h"
 
 /*
@@ -66,12 +67,28 @@ static int __init spl_init(void)
 	strcpy(hw_serial, "007f0100"); /* loopback */
         printk(KERN_INFO "spl: Loaded Solaris Porting Layer v%s\n", VERSION);
 
+#ifdef DEBUG_KMEM
+	atomic64_set(&kmem_alloc_used, 0);
+	atomic64_set(&vmem_alloc_used, 0);
+#endif
+
 	return 0;
 }
 
 static void spl_fini(void)
 {
 	vn_fini();
+
+#ifdef DEBUG_KMEM
+	if (atomic64_read(&kmem_alloc_used) != 0)
+		printk("Warning: kmem leaked %ld/%ld bytes\n",
+                       atomic_read(&kmem_alloc_used), kmem_alloc_max);
+
+	if (atomic64_read(&vmem_alloc_used) != 0)
+		printk("Warning: vmem leaked %ld/%ld bytes\n",
+                       atomic_read(&vmem_alloc_used), vmem_alloc_max);
+#endif
+
 	return;
 }
 

modules/spl/spl-kmem.c

@@ -5,16 +5,23 @@
  */
 #ifdef DEBUG_KMEM
 /* Shim layer memory accounting */
-atomic_t kmem_alloc_used;
-unsigned int kmem_alloc_max;
-atomic_t vmem_alloc_used;
-unsigned int vmem_alloc_max;
+atomic64_t kmem_alloc_used;
+unsigned long kmem_alloc_max = 0;
+atomic64_t vmem_alloc_used;
+unsigned long vmem_alloc_max = 0;
+int kmem_warning_flag = 1;
 
 EXPORT_SYMBOL(kmem_alloc_used);
 EXPORT_SYMBOL(kmem_alloc_max);
 EXPORT_SYMBOL(vmem_alloc_used);
 EXPORT_SYMBOL(vmem_alloc_max);
+EXPORT_SYMBOL(kmem_warning_flag);
+
+int kmem_set_warning(int flag) { return (kmem_warning_flag = !!flag); }
+#else
+int kmem_set_warning(int flag) { return 0; }
 #endif
+EXPORT_SYMBOL(kmem_set_warning);
 
 /*
  * Slab allocation interfaces
@@ -187,11 +194,17 @@ __kmem_cache_create(char *name, size_t size, size_t align,
         kmem_cache_t *cache;
         kmem_cache_cb_t *kcc;
 	int shrinker_flag = 0;
+	char *cache_name;
 
         /* FIXME: - Option currently unsupported by shim layer */
         BUG_ON(vmp);
 
-        cache = kmem_cache_create(name, size, align, flags,
+	cache_name = kzalloc(strlen(name) + 1, GFP_KERNEL);
+	if (cache_name == NULL)
+		return NULL;
+
+	strcpy(cache_name, name);
+        cache = kmem_cache_create(cache_name, size, align, flags,
                                   kmem_cache_generic_constructor,
                                   kmem_cache_generic_destructor);
 	if (cache == NULL)
@@ -230,6 +243,7 @@ void
 __kmem_cache_destroy(kmem_cache_t *cache)
 {
         kmem_cache_cb_t *kcc;
+	char *name;
 
 	spin_lock(&kmem_cache_cb_lock);
         kcc = kmem_cache_find_cache_cb(cache);
@@ -237,8 +251,10 @@ __kmem_cache_destroy(kmem_cache_t *cache)
         if (kcc == NULL)
                 return;
 
+	name = (char *)kmem_cache_name(cache);
         kmem_cache_destroy(cache);
         kmem_cache_remove_cache_cb(kcc);
+	kfree(name);
 
 	/* Unregister generic shrinker on removal of all caches */
 	spin_lock(&kmem_cache_cb_lock);

modules/splat/splat-kmem.c

@@ -35,6 +35,10 @@ splat_kmem_test1(struct file *file, void *arg)
 	int size = PAGE_SIZE;
 	int i, count, rc = 0;
 
+	/* We are intentionally going to push kmem_alloc to its max
+	 * allocation size, so suppress the console warnings for now */
+	kmem_set_warning(0);
+
 	while ((!rc) && (size <= (PAGE_SIZE * 32))) {
 		count = 0;
 
@@ -57,6 +61,8 @@ splat_kmem_test1(struct file *file, void *arg)
 		size *= 2;
 	}
 
+	kmem_set_warning(1);
+
 	return rc;
 }
 
@@ -67,6 +73,10 @@ splat_kmem_test2(struct file *file, void *arg)
 	int size = PAGE_SIZE;
 	int i, j, count, rc = 0;
 
+	/* We are intentionally going to push kmem_alloc to its max
+	 * allocation size, so suppress the console warnings for now */
+	kmem_set_warning(0);
+
 	while ((!rc) && (size <= (PAGE_SIZE * 32))) {
 		count = 0;
 
@@ -101,6 +111,8 @@ splat_kmem_test2(struct file *file, void *arg)
 		size *= 2;
 	}
 
+	kmem_set_warning(1);
+
 	return rc;
 }