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Merge branch 'core-debugobjects-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Browse Source 
Pull debugobjects updates from Ingo Molnar:
 "A number of scalability improvements by Waimang Long"

* 'core-debugobjects-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  debugobjects: Improve variable naming
  debugobjects: Reduce contention on the global pool_lock
  debugobjects: Scale thresholds with # of CPUs
  debugobjects: Track number of kmem_cache_alloc/kmem_cache_free done
This commit is contained in:
Linus Torvalds 2017-02-20 11:19:09 -08:00
commit 575260e3f8
1 changed files with 46 additions and 12 deletions
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58
lib/debugobjects.c
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@ -52,9 +52,18 @@ static int debug_objects_fixups __read_mostly;
static int debug_objects_warnings __read_mostly;
static int debug_objects_enabled __read_mostly
= CONFIG_DEBUG_OBJECTS_ENABLE_DEFAULT;
static int debug_objects_pool_size __read_mostly
= ODEBUG_POOL_SIZE;
static int debug_objects_pool_min_level __read_mostly
= ODEBUG_POOL_MIN_LEVEL;
static struct debug_obj_descr *descr_test __read_mostly;
/*
* Track numbers of kmem_cache_alloc()/free() calls done.
*/
static int debug_objects_allocated;
static int debug_objects_freed;
static void free_obj_work(struct work_struct *work);
static DECLARE_WORK(debug_obj_work, free_obj_work);
@ -88,13 +97,13 @@ static void fill_pool(void)
struct debug_obj *new;
unsigned long flags;
if (likely(obj_pool_free >= ODEBUG_POOL_MIN_LEVEL))
if (likely(obj_pool_free >= debug_objects_pool_min_level))
return;
if (unlikely(!obj_cache))
return;
while (obj_pool_free < ODEBUG_POOL_MIN_LEVEL) {
while (obj_pool_free < debug_objects_pool_min_level) {
new = kmem_cache_zalloc(obj_cache, gfp);
if (!new)
@ -102,6 +111,7 @@ static void fill_pool(void)
raw_spin_lock_irqsave(&pool_lock, flags);
hlist_add_head(&new->node, &obj_pool);
debug_objects_allocated++;
obj_pool_free++;
raw_spin_unlock_irqrestore(&pool_lock, flags);
}
@ -162,24 +172,39 @@ 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.
*/
#define ODEBUG_FREE_BATCH 4
static void free_obj_work(struct work_struct *work)
{
struct debug_obj *obj;
struct debug_obj *objs[ODEBUG_FREE_BATCH];
unsigned long flags;
int i;
raw_spin_lock_irqsave(&pool_lock, flags);
while (obj_pool_free > ODEBUG_POOL_SIZE) {
obj = hlist_entry(obj_pool.first, typeof(*obj), node);
hlist_del(&obj->node);
obj_pool_free--;
if (!raw_spin_trylock_irqsave(&pool_lock, flags))
return;
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);
kmem_cache_free(obj_cache, obj);
raw_spin_lock_irqsave(&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);
}
@ -198,7 +223,7 @@ static void free_object(struct debug_obj *obj)
* schedule work when the pool is filled and the cache is
* initialized:
*/
if (obj_pool_free > ODEBUG_POOL_SIZE && obj_cache)
if (obj_pool_free > debug_objects_pool_size && obj_cache)
sched = 1;
hlist_add_head(&obj->node, &obj_pool);
obj_pool_free++;
@ -758,6 +783,8 @@ 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, "objs_allocated:%d\n", debug_objects_allocated);
seq_printf(m, "objs_freed :%d\n", debug_objects_freed);
return 0;
}
@ -1116,4 +1143,11 @@ void __init debug_objects_mem_init(void)
pr_warn("out of memory.\n");
} else
debug_objects_selftest();
/*
* Increase the thresholds for allocating and freeing objects
* according to the number of possible CPUs available in the system.
*/
debug_objects_pool_size += num_possible_cpus() * 32;
debug_objects_pool_min_level += num_possible_cpus() * 4;
}