Limit maximum object size in kmem tests

Limit the maximum object size to 1/128 of total system memory for the kmem cache tests. Large values can result in out of memory errors for systems with less the 512M of memory. Additionally, use the known number of objects per-slab for calculating the number of objects to use for a test. Signed-off-by: Brian Behlendorf <[email protected]>
zgock · Nov 16, 2015 · e7b75d9 · e7b75d9
1 parent 31f2493
commit e7b75d9
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/module/splat/splat-kmem.c b/module/splat/splat-kmem.c
@@ -590,6 +590,9 @@ splat_kmem_cache_test(struct file *file, void *arg, char *name,
 	kmem_cache_data_t **kcd = NULL;
 	int i, rc = 0, objs = 0;
 
+	/* Limit size for low memory machines (1/128 of memory) */
+	size = MIN(size, (physmem * PAGE_SIZE) >> 7);
+
 	splat_vprint(file, name,
 	    "Testing size=%d, align=%d, flags=0x%04x\n",
 	    size, align, flags);
@@ -619,7 +622,7 @@ splat_kmem_cache_test(struct file *file, void *arg, char *name,
 	 * it to a single slab for the purposes of this test.
 	 */
 #ifdef _LP64
-	objs = SPL_KMEM_CACHE_OBJ_PER_SLAB * 4;
+	objs = kcp->kcp_cache->skc_slab_objs * 4;
 #else
 	objs = 1;
 #endif