[RESEND PATCH v2 1/3] debugobjects: Track number of kmem_cache_alloc/kmem_cache_free done

From: Waiman Long
Date: Thu Jan 05 2017 - 15:17:36 EST


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 <longman@xxxxxxxxxx>
---
lib/debugobjects.c | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/lib/debugobjects.c b/lib/debugobjects.c
index 04c1ef7..d78673e 100644
--- a/lib/debugobjects.c
+++ b/lib/debugobjects.c
@@ -55,6 +55,12 @@ struct debug_bucket {

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);

@@ -102,6 +108,7 @@ 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);
}
@@ -173,6 +180,7 @@ 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.
@@ -758,6 +766,8 @@ 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