[PATCH 2/3] debugobjects: Track number of kmem_cache_alloc/kmem_cache_free done

[Waiman Long]

New debugfs stat counters are added to track the numbers of
kmem_cache_alloc() and kmem_cache_free() function calls to get a
sense of how the internal debug objects cache management is performing.

Signed-off-by: Waiman Long <long...@redhat.com>
---
 lib/debugobjects.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/lib/debugobjects.c b/lib/debugobjects.c
index bb415a7..820e733 100644
--- a/lib/debugobjects.c
+++ b/lib/debugobjects.c
@@ -58,6 +58,12 @@ struct debug_bucket {
                                = ODEBUG_POOL_MIN_LEVEL;
 static struct debug_obj_descr  *descr_test  __read_mostly;
 
+/*
+ * Track numbers of kmem_cache_alloc and kmem_cache_free done.
+ */
+static int                     debug_objects_alloc;
+static int                     debug_objects_freed;
+
 static void free_obj_work(struct work_struct *work);
 static DECLARE_WORK(debug_obj_work, free_obj_work);
 
@@ -105,6 +111,7 @@ static void fill_pool(void)
 
                raw_spin_lock_irqsave(&pool_lock, flags);
                hlist_add_head(&new->node, &obj_pool);
+               debug_objects_alloc++;
                obj_pool_free++;
                raw_spin_unlock_irqrestore(&pool_lock, flags);
        }
@@ -176,6 +183,7 @@ static void free_obj_work(struct work_struct *work)
                obj = hlist_entry(obj_pool.first, typeof(*obj), node);
                hlist_del(&obj->node);
                obj_pool_free--;
+               debug_objects_freed++;
                /*
                 * We release pool_lock across kmem_cache_free() to
                 * avoid contention on pool_lock.
@@ -753,6 +761,8 @@ static int debug_stats_show(struct seq_file *m, void *v)
        seq_printf(m, "pool_min_free :%d\n", obj_pool_min_free);
        seq_printf(m, "pool_used     :%d\n", obj_pool_used);
        seq_printf(m, "pool_max_used :%d\n", obj_pool_max_used);
+       seq_printf(m, "objects_alloc :%d\n", debug_objects_alloc);
+       seq_printf(m, "objects_freed :%d\n", debug_objects_freed);
        return 0;
 }
 
-- 
1.8.3.1