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authorYang Shi <yang.shi@linux.alibaba.com>2018-02-06 07:18:27 +0800
committerThomas Gleixner <tglx@linutronix.de>2018-02-13 10:58:59 +0100
commit636e1970fd7deaa0d0ee0dfb6ac65fbd690b32d2 (patch)
tree4cec59377bf77600013af40888433dcb57716722 /lib/debugobjects.c
parent36c4ead6f6dfbbe777d3d7e9cc8702530b71a94f (diff)
downloadlinux-636e1970fd7deaa0d0ee0dfb6ac65fbd690b32d2.tar.bz2
debugobjects: Use global free list in free_object()
The newly added global free list allows to avoid lengthy pool_list iterations in free_obj_work() by putting objects either into the pool list when the fill level of the pool is below the maximum or by putting them on the global free list immediately. As the pool is now guaranteed to never exceed the maximum fill level this allows to remove the batch removal from pool list in free_obj_work(). Split free_object() into two parts, so the actual queueing function can be reused without invoking schedule_work() on every invocation. [ tglx: Remove the batch removal from pool list and massage changelog ] Suggested-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Yang Shi <yang.shi@linux.alibaba.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: longman@redhat.com Link: https://lkml.kernel.org/r/1517872708-24207-4-git-send-email-yang.shi@linux.alibaba.com
Diffstat (limited to 'lib/debugobjects.c')
-rw-r--r--lib/debugobjects.c63
1 files changed, 22 insertions, 41 deletions
diff --git a/lib/debugobjects.c b/lib/debugobjects.c
index e31273b45da5..3e79c100271f 100644
--- a/lib/debugobjects.c
+++ b/lib/debugobjects.c
@@ -201,18 +201,13 @@ alloc_object(void *addr, struct debug_bucket *b, struct debug_obj_descr *descr)
* workqueue function to free objects.
*
* To reduce contention on the global pool_lock, the actual freeing of
- * debug objects will be delayed if the pool_lock is busy. We also free
- * the objects in a batch of 4 for each lock/unlock cycle.
+ * debug objects will be delayed if the pool_lock is busy.
*/
-#define ODEBUG_FREE_BATCH 4
-
static void free_obj_work(struct work_struct *work)
{
- struct debug_obj *objs[ODEBUG_FREE_BATCH];
struct hlist_node *tmp;
struct debug_obj *obj;
unsigned long flags;
- int i;
HLIST_HEAD(tofree);
if (!raw_spin_trylock_irqsave(&pool_lock, flags))
@@ -240,26 +235,6 @@ static void free_obj_work(struct work_struct *work)
hlist_move_list(&obj_to_free, &tofree);
obj_nr_tofree = 0;
}
-
- while (obj_pool_free >= debug_objects_pool_size + ODEBUG_FREE_BATCH) {
- for (i = 0; i < ODEBUG_FREE_BATCH; i++) {
- objs[i] = hlist_entry(obj_pool.first,
- typeof(*objs[0]), node);
- hlist_del(&objs[i]->node);
- }
-
- obj_pool_free -= ODEBUG_FREE_BATCH;
- debug_objects_freed += ODEBUG_FREE_BATCH;
- /*
- * We release pool_lock across kmem_cache_free() to
- * avoid contention on pool_lock.
- */
- raw_spin_unlock_irqrestore(&pool_lock, flags);
- for (i = 0; i < ODEBUG_FREE_BATCH; i++)
- kmem_cache_free(obj_cache, objs[i]);
- if (!raw_spin_trylock_irqsave(&pool_lock, flags))
- return;
- }
raw_spin_unlock_irqrestore(&pool_lock, flags);
hlist_for_each_entry_safe(obj, tmp, &tofree, node) {
@@ -268,27 +243,33 @@ static void free_obj_work(struct work_struct *work)
}
}
-/*
- * Put the object back into the pool and schedule work to free objects
- * if necessary.
- */
-static void free_object(struct debug_obj *obj)
+static bool __free_object(struct debug_obj *obj)
{
unsigned long flags;
- int sched = 0;
+ bool work;
raw_spin_lock_irqsave(&pool_lock, flags);
- /*
- * schedule work when the pool is filled and the cache is
- * initialized:
- */
- if (obj_pool_free > debug_objects_pool_size && obj_cache)
- sched = 1;
- hlist_add_head(&obj->node, &obj_pool);
- obj_pool_free++;
+ work = (obj_pool_free > debug_objects_pool_size) && obj_cache;
obj_pool_used--;
+
+ if (work) {
+ obj_nr_tofree++;
+ hlist_add_head(&obj->node, &obj_to_free);
+ } else {
+ obj_pool_free++;
+ hlist_add_head(&obj->node, &obj_pool);
+ }
raw_spin_unlock_irqrestore(&pool_lock, flags);
- if (sched)
+ return work;
+}
+
+/*
+ * Put the object back into the pool and schedule work to free objects
+ * if necessary.
+ */
+static void free_object(struct debug_obj *obj)
+{
+ if (__free_object(obj))
schedule_work(&debug_obj_work);
}