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Commit c4b73aab authored by Waiman Long's avatar Waiman Long Committed by Thomas Gleixner
Browse files

debugobjects: Track number of kmem_cache_alloc/kmem_cache_free done 



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: default avatarWaiman Long <longman@redhat.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: "Du Changbin" <changbin.du@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jan Stancek <jstancek@redhat.com>
Link: http://lkml.kernel.org/r/1483647425-4135-2-git-send-email-longman@redhat.com


Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 566cf877

lib/debugobjects.c

+10 −0
Original line number Diff line number Diff line
@@ -55,6 +55,12 @@ static int debug_objects_enabled __read_mostly 


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;

}