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lib/debugobjects.c
34.2 KB
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/* * Generic infrastructure for lifetime debugging of objects. * * Started by Thomas Gleixner * * Copyright (C) 2008, Thomas Gleixner <tglx@linutronix.de> * * For licencing details see kernel-base/COPYING */ |
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#define pr_fmt(fmt) "ODEBUG: " fmt |
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#include <linux/debugobjects.h> #include <linux/interrupt.h> |
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#include <linux/sched.h> |
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#include <linux/sched/task_stack.h> |
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#include <linux/seq_file.h> #include <linux/debugfs.h> |
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#include <linux/slab.h> |
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#include <linux/hash.h> |
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#include <linux/kmemleak.h> |
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#define ODEBUG_HASH_BITS 14 #define ODEBUG_HASH_SIZE (1 << ODEBUG_HASH_BITS) |
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#define ODEBUG_POOL_SIZE 1024 |
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#define ODEBUG_POOL_MIN_LEVEL 256 |
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#define ODEBUG_POOL_PERCPU_SIZE 64 |
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#define ODEBUG_BATCH_SIZE 16 |
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#define ODEBUG_CHUNK_SHIFT PAGE_SHIFT #define ODEBUG_CHUNK_SIZE (1 << ODEBUG_CHUNK_SHIFT) #define ODEBUG_CHUNK_MASK (~(ODEBUG_CHUNK_SIZE - 1)) |
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/* * We limit the freeing of debug objects via workqueue at a maximum * frequency of 10Hz and about 1024 objects for each freeing operation. * So it is freeing at most 10k debug objects per second. */ #define ODEBUG_FREE_WORK_MAX 1024 #define ODEBUG_FREE_WORK_DELAY DIV_ROUND_UP(HZ, 10) |
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struct debug_bucket { struct hlist_head list; |
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raw_spinlock_t lock; |
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}; |
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/* * Debug object percpu free list * Access is protected by disabling irq */ struct debug_percpu_free { struct hlist_head free_objs; int obj_free; }; static DEFINE_PER_CPU(struct debug_percpu_free, percpu_obj_pool); |
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static struct debug_bucket obj_hash[ODEBUG_HASH_SIZE]; |
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static struct debug_obj obj_static_pool[ODEBUG_POOL_SIZE] __initdata; |
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static DEFINE_RAW_SPINLOCK(pool_lock); |
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static HLIST_HEAD(obj_pool); |
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static HLIST_HEAD(obj_to_free); |
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/* * Because of the presence of percpu free pools, obj_pool_free will * under-count those in the percpu free pools. Similarly, obj_pool_used * will over-count those in the percpu free pools. Adjustments will be * made at debug_stats_show(). Both obj_pool_min_free and obj_pool_max_used * can be off. */ |
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static int obj_pool_min_free = ODEBUG_POOL_SIZE; static int obj_pool_free = ODEBUG_POOL_SIZE; static int obj_pool_used; static int obj_pool_max_used; |
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static bool obj_freeing; |
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/* The number of objs on the global free list */ static int obj_nr_tofree; |
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static int debug_objects_maxchain __read_mostly; |
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static int __maybe_unused debug_objects_maxchecked __read_mostly; |
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static int debug_objects_fixups __read_mostly; static int debug_objects_warnings __read_mostly; |
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static int debug_objects_enabled __read_mostly = CONFIG_DEBUG_OBJECTS_ENABLE_DEFAULT; |
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static int debug_objects_pool_size __read_mostly = ODEBUG_POOL_SIZE; static int debug_objects_pool_min_level __read_mostly = ODEBUG_POOL_MIN_LEVEL; |
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static struct debug_obj_descr *descr_test __read_mostly; |
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static struct kmem_cache *obj_cache __read_mostly; |
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/* |
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* Track numbers of kmem_cache_alloc()/free() calls done. |
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*/ |
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static int debug_objects_allocated; |
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static int debug_objects_freed; |
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static void free_obj_work(struct work_struct *work); |
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static DECLARE_DELAYED_WORK(debug_obj_work, free_obj_work); |
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static int __init enable_object_debug(char *str) { debug_objects_enabled = 1; return 0; } |
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static int __init disable_object_debug(char *str) { debug_objects_enabled = 0; return 0; } |
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early_param("debug_objects", enable_object_debug); |
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early_param("no_debug_objects", disable_object_debug); |
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static const char *obj_states[ODEBUG_STATE_MAX] = { [ODEBUG_STATE_NONE] = "none", [ODEBUG_STATE_INIT] = "initialized", [ODEBUG_STATE_INACTIVE] = "inactive", [ODEBUG_STATE_ACTIVE] = "active", [ODEBUG_STATE_DESTROYED] = "destroyed", [ODEBUG_STATE_NOTAVAILABLE] = "not available", }; |
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static void fill_pool(void) |
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{ gfp_t gfp = GFP_ATOMIC | __GFP_NORETRY | __GFP_NOWARN; |
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struct debug_obj *obj; |
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unsigned long flags; |
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if (likely(obj_pool_free >= debug_objects_pool_min_level)) |
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return; |
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/* * Reuse objs from the global free list; they will be reinitialized * when allocating. */ while (obj_nr_tofree && (obj_pool_free < obj_pool_min_free)) { raw_spin_lock_irqsave(&pool_lock, flags); /* * Recheck with the lock held as the worker thread might have * won the race and freed the global free list already. */ |
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while (obj_nr_tofree && (obj_pool_free < obj_pool_min_free)) { |
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obj = hlist_entry(obj_to_free.first, typeof(*obj), node); hlist_del(&obj->node); obj_nr_tofree--; hlist_add_head(&obj->node, &obj_pool); obj_pool_free++; } raw_spin_unlock_irqrestore(&pool_lock, flags); } |
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if (unlikely(!obj_cache)) |
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return; |
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while (obj_pool_free < debug_objects_pool_min_level) { |
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struct debug_obj *new[ODEBUG_BATCH_SIZE]; int cnt; |
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for (cnt = 0; cnt < ODEBUG_BATCH_SIZE; cnt++) { new[cnt] = kmem_cache_zalloc(obj_cache, gfp); if (!new[cnt]) break; } if (!cnt) |
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return; |
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raw_spin_lock_irqsave(&pool_lock, flags); |
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while (cnt) { hlist_add_head(&new[--cnt]->node, &obj_pool); debug_objects_allocated++; obj_pool_free++; } |
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raw_spin_unlock_irqrestore(&pool_lock, flags); |
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} |
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} /* * Lookup an object in the hash bucket. */ static struct debug_obj *lookup_object(void *addr, struct debug_bucket *b) { |
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struct debug_obj *obj; int cnt = 0; |
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hlist_for_each_entry(obj, &b->list, node) { |
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cnt++; if (obj->object == addr) return obj; } if (cnt > debug_objects_maxchain) debug_objects_maxchain = cnt; return NULL; } /* |
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* Allocate a new object from the hlist */ static struct debug_obj *__alloc_object(struct hlist_head *list) { struct debug_obj *obj = NULL; if (list->first) { obj = hlist_entry(list->first, typeof(*obj), node); hlist_del(&obj->node); } return obj; } /* |
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* Allocate a new object. If the pool is empty, switch off the debugger. |
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* Must be called with interrupts disabled. |
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*/ static struct debug_obj * alloc_object(void *addr, struct debug_bucket *b, struct debug_obj_descr *descr) { |
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struct debug_percpu_free *percpu_pool = this_cpu_ptr(&percpu_obj_pool); |
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struct debug_obj *obj; |
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if (likely(obj_cache)) { |
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obj = __alloc_object(&percpu_pool->free_objs); if (obj) { percpu_pool->obj_free--; goto init_obj; } } |
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raw_spin_lock(&pool_lock); obj = __alloc_object(&obj_pool); if (obj) { |
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obj_pool_used++; |
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obj_pool_free--; /* * Looking ahead, allocate one batch of debug objects and * put them into the percpu free pool. */ if (likely(obj_cache)) { int i; for (i = 0; i < ODEBUG_BATCH_SIZE; i++) { struct debug_obj *obj2; obj2 = __alloc_object(&obj_pool); if (!obj2) break; hlist_add_head(&obj2->node, &percpu_pool->free_objs); percpu_pool->obj_free++; obj_pool_used++; obj_pool_free--; } } |
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if (obj_pool_used > obj_pool_max_used) obj_pool_max_used = obj_pool_used; |
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if (obj_pool_free < obj_pool_min_free) obj_pool_min_free = obj_pool_free; } |
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raw_spin_unlock(&pool_lock); |
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init_obj: if (obj) { obj->object = addr; obj->descr = descr; obj->state = ODEBUG_STATE_NONE; obj->astate = 0; hlist_add_head(&obj->node, &b->list); } |
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return obj; } /* |
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* workqueue function to free objects. |
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* * To reduce contention on the global pool_lock, the actual freeing of |
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* debug objects will be delayed if the pool_lock is busy. |
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*/ |
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static void free_obj_work(struct work_struct *work) |
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{ |
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struct hlist_node *tmp; struct debug_obj *obj; |
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unsigned long flags; |
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HLIST_HEAD(tofree); |
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WRITE_ONCE(obj_freeing, false); |
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if (!raw_spin_trylock_irqsave(&pool_lock, flags)) return; |
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if (obj_pool_free >= debug_objects_pool_size) goto free_objs; |
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/* * The objs on the pool list might be allocated before the work is * run, so recheck if pool list it full or not, if not fill pool |
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* list from the global free list. As it is likely that a workload * may be gearing up to use more and more objects, don't free any * of them until the next round. |
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*/ while (obj_nr_tofree && obj_pool_free < debug_objects_pool_size) { obj = hlist_entry(obj_to_free.first, typeof(*obj), node); hlist_del(&obj->node); hlist_add_head(&obj->node, &obj_pool); obj_pool_free++; obj_nr_tofree--; } |
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raw_spin_unlock_irqrestore(&pool_lock, flags); return; |
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free_objs: |
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/* * Pool list is already full and there are still objs on the free * list. Move remaining free objs to a temporary list to free the * memory outside the pool_lock held region. */ if (obj_nr_tofree) { hlist_move_list(&obj_to_free, &tofree); |
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debug_objects_freed += obj_nr_tofree; |
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obj_nr_tofree = 0; } |
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raw_spin_unlock_irqrestore(&pool_lock, flags); |
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hlist_for_each_entry_safe(obj, tmp, &tofree, node) { hlist_del(&obj->node); kmem_cache_free(obj_cache, obj); } |
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} |
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static void __free_object(struct debug_obj *obj) |
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{ |
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struct debug_obj *objs[ODEBUG_BATCH_SIZE]; struct debug_percpu_free *percpu_pool; int lookahead_count = 0; |
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unsigned long flags; |
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bool work; |
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local_irq_save(flags); |
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if (!obj_cache) goto free_to_obj_pool; |
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/* * Try to free it into the percpu pool first. */ percpu_pool = this_cpu_ptr(&percpu_obj_pool); |
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if (percpu_pool->obj_free < ODEBUG_POOL_PERCPU_SIZE) { |
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hlist_add_head(&obj->node, &percpu_pool->free_objs); percpu_pool->obj_free++; local_irq_restore(flags); |
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return; |
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} |
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/* * As the percpu pool is full, look ahead and pull out a batch * of objects from the percpu pool and free them as well. */ for (; lookahead_count < ODEBUG_BATCH_SIZE; lookahead_count++) { objs[lookahead_count] = __alloc_object(&percpu_pool->free_objs); if (!objs[lookahead_count]) break; percpu_pool->obj_free--; } free_to_obj_pool: |
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raw_spin_lock(&pool_lock); |
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work = (obj_pool_free > debug_objects_pool_size) && obj_cache && (obj_nr_tofree < ODEBUG_FREE_WORK_MAX); |
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obj_pool_used--; |
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if (work) { obj_nr_tofree++; hlist_add_head(&obj->node, &obj_to_free); |
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if (lookahead_count) { obj_nr_tofree += lookahead_count; obj_pool_used -= lookahead_count; while (lookahead_count) { hlist_add_head(&objs[--lookahead_count]->node, &obj_to_free); } } |
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if ((obj_pool_free > debug_objects_pool_size) && (obj_nr_tofree < ODEBUG_FREE_WORK_MAX)) { int i; /* * Free one more batch of objects from obj_pool. */ for (i = 0; i < ODEBUG_BATCH_SIZE; i++) { obj = __alloc_object(&obj_pool); hlist_add_head(&obj->node, &obj_to_free); obj_pool_free--; obj_nr_tofree++; } } |
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} else { obj_pool_free++; hlist_add_head(&obj->node, &obj_pool); |
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if (lookahead_count) { obj_pool_free += lookahead_count; obj_pool_used -= lookahead_count; while (lookahead_count) { hlist_add_head(&objs[--lookahead_count]->node, &obj_pool); } } |
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} |
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raw_spin_unlock(&pool_lock); local_irq_restore(flags); |
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} /* * Put the object back into the pool and schedule work to free objects * if necessary. */ static void free_object(struct debug_obj *obj) { |
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__free_object(obj); if (!obj_freeing && obj_nr_tofree) { WRITE_ONCE(obj_freeing, true); schedule_delayed_work(&debug_obj_work, ODEBUG_FREE_WORK_DELAY); } |
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} /* * We run out of memory. That means we probably have tons of objects * allocated. */ static void debug_objects_oom(void) { struct debug_bucket *db = obj_hash; |
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struct hlist_node *tmp; |
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HLIST_HEAD(freelist); |
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struct debug_obj *obj; unsigned long flags; int i; |
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pr_warn("Out of memory. ODEBUG disabled "); |
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for (i = 0; i < ODEBUG_HASH_SIZE; i++, db++) { |
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raw_spin_lock_irqsave(&db->lock, flags); |
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hlist_move_list(&db->list, &freelist); |
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raw_spin_unlock_irqrestore(&db->lock, flags); |
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/* Now free them */ |
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hlist_for_each_entry_safe(obj, tmp, &freelist, node) { |
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hlist_del(&obj->node); free_object(obj); } |
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} } /* * We use the pfn of the address for the hash. That way we can check * for freed objects simply by checking the affected bucket. */ static struct debug_bucket *get_bucket(unsigned long addr) { unsigned long hash; hash = hash_long((addr >> ODEBUG_CHUNK_SHIFT), ODEBUG_HASH_BITS); return &obj_hash[hash]; } static void debug_print_object(struct debug_obj *obj, char *msg) { |
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struct debug_obj_descr *descr = obj->descr; |
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static int limit; |
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if (limit < 5 && descr != descr_test) { void *hint = descr->debug_hint ? descr->debug_hint(obj->object) : NULL; |
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limit++; |
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WARN(1, KERN_ERR "ODEBUG: %s %s (active state %u) " |
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"object type: %s hint: %pS ", |
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msg, obj_states[obj->state], obj->astate, |
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descr->name, hint); |
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} debug_objects_warnings++; } /* * Try to repair the damage, so we have a better chance to get useful * debug output. */ |
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static bool debug_object_fixup(bool (*fixup)(void *addr, enum debug_obj_state state), |
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void * addr, enum debug_obj_state state) { |
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if (fixup && fixup(addr, state)) { debug_objects_fixups++; return true; } return false; |
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} static void debug_object_is_on_stack(void *addr, int onstack) { |
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int is_on_stack; static int limit; if (limit > 4) return; |
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is_on_stack = object_is_on_stack(addr); |
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if (is_on_stack == onstack) return; limit++; if (is_on_stack) |
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pr_warn("object %p is on stack %p, but NOT annotated. ", addr, task_stack_page(current)); |
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else |
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pr_warn("object %p is NOT on stack %p, but annotated. ", addr, task_stack_page(current)); |
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WARN_ON(1); } static void __debug_object_init(void *addr, struct debug_obj_descr *descr, int onstack) { enum debug_obj_state state; |
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bool check_stack = false; |
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struct debug_bucket *db; struct debug_obj *obj; unsigned long flags; |
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fill_pool(); |
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db = get_bucket((unsigned long) addr); |
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raw_spin_lock_irqsave(&db->lock, flags); |
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obj = lookup_object(addr, db); if (!obj) { obj = alloc_object(addr, db, descr); if (!obj) { debug_objects_enabled = 0; |
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raw_spin_unlock_irqrestore(&db->lock, flags); |
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debug_objects_oom(); return; } |
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check_stack = true; |
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} switch (obj->state) { case ODEBUG_STATE_NONE: case ODEBUG_STATE_INIT: case ODEBUG_STATE_INACTIVE: obj->state = ODEBUG_STATE_INIT; break; case ODEBUG_STATE_ACTIVE: |
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state = obj->state; |
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|
542 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
d5f34153e
|
543 |
debug_print_object(obj, "init"); |
3ac7fe5a4
|
544 545 546 547 |
debug_object_fixup(descr->fixup_init, addr, state); return; case ODEBUG_STATE_DESTROYED: |
d5f34153e
|
548 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a4
|
549 |
debug_print_object(obj, "init"); |
d5f34153e
|
550 |
return; |
3ac7fe5a4
|
551 552 553 |
default: break; } |
aef9cb052
|
554 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
d5f34153e
|
555 556 |
if (check_stack) debug_object_is_on_stack(addr, onstack); |
3ac7fe5a4
|
557 558 559 560 561 562 563 564 565 566 567 568 569 570 |
} /** * debug_object_init - debug checks when an object is initialized * @addr: address of the object * @descr: pointer to an object specific debug description structure */ void debug_object_init(void *addr, struct debug_obj_descr *descr) { if (!debug_objects_enabled) return; __debug_object_init(addr, descr, 0); } |
f8ff04e2b
|
571 |
EXPORT_SYMBOL_GPL(debug_object_init); |
3ac7fe5a4
|
572 573 574 575 576 577 578 579 580 581 582 583 584 585 |
/** * debug_object_init_on_stack - debug checks when an object on stack is * initialized * @addr: address of the object * @descr: pointer to an object specific debug description structure */ void debug_object_init_on_stack(void *addr, struct debug_obj_descr *descr) { if (!debug_objects_enabled) return; __debug_object_init(addr, descr, 1); } |
f8ff04e2b
|
586 |
EXPORT_SYMBOL_GPL(debug_object_init_on_stack); |
3ac7fe5a4
|
587 588 589 590 591 |
/** * debug_object_activate - debug checks when an object is activated * @addr: address of the object * @descr: pointer to an object specific debug description structure |
b778ae253
|
592 |
* Returns 0 for success, -EINVAL for check failed. |
3ac7fe5a4
|
593 |
*/ |
b778ae253
|
594 |
int debug_object_activate(void *addr, struct debug_obj_descr *descr) |
3ac7fe5a4
|
595 596 597 598 599 |
{ enum debug_obj_state state; struct debug_bucket *db; struct debug_obj *obj; unsigned long flags; |
b778ae253
|
600 |
int ret; |
feac18dda
|
601 602 603 |
struct debug_obj o = { .object = addr, .state = ODEBUG_STATE_NOTAVAILABLE, .descr = descr }; |
3ac7fe5a4
|
604 605 |
if (!debug_objects_enabled) |
b778ae253
|
606 |
return 0; |
3ac7fe5a4
|
607 608 |
db = get_bucket((unsigned long) addr); |
aef9cb052
|
609 |
raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a4
|
610 611 612 |
obj = lookup_object(addr, db); if (obj) { |
d5f34153e
|
613 |
bool print_object = false; |
3ac7fe5a4
|
614 615 616 617 |
switch (obj->state) { case ODEBUG_STATE_INIT: case ODEBUG_STATE_INACTIVE: obj->state = ODEBUG_STATE_ACTIVE; |
b778ae253
|
618 |
ret = 0; |
3ac7fe5a4
|
619 620 621 |
break; case ODEBUG_STATE_ACTIVE: |
3ac7fe5a4
|
622 |
state = obj->state; |
aef9cb052
|
623 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
d5f34153e
|
624 |
debug_print_object(obj, "activate"); |
b778ae253
|
625 |
ret = debug_object_fixup(descr->fixup_activate, addr, state); |
e7a8e78bd
|
626 |
return ret ? 0 : -EINVAL; |
3ac7fe5a4
|
627 628 |
case ODEBUG_STATE_DESTROYED: |
d5f34153e
|
629 |
print_object = true; |
b778ae253
|
630 |
ret = -EINVAL; |
3ac7fe5a4
|
631 632 |
break; default: |
b778ae253
|
633 |
ret = 0; |
3ac7fe5a4
|
634 635 |
break; } |
aef9cb052
|
636 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
d5f34153e
|
637 638 |
if (print_object) debug_print_object(obj, "activate"); |
b778ae253
|
639 |
return ret; |
3ac7fe5a4
|
640 |
} |
aef9cb052
|
641 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
d5f34153e
|
642 |
|
3ac7fe5a4
|
643 |
/* |
b9fdac7f6
|
644 645 646 647 648 |
* We are here when a static object is activated. We * let the type specific code confirm whether this is * true or not. if true, we just make sure that the * static object is tracked in the object tracker. If * not, this must be a bug, so we try to fix it up. |
3ac7fe5a4
|
649 |
*/ |
b9fdac7f6
|
650 651 652 653 654 |
if (descr->is_static_object && descr->is_static_object(addr)) { /* track this static object */ debug_object_init(addr, descr); debug_object_activate(addr, descr); } else { |
feac18dda
|
655 |
debug_print_object(&o, "activate"); |
b9fdac7f6
|
656 657 658 |
ret = debug_object_fixup(descr->fixup_activate, addr, ODEBUG_STATE_NOTAVAILABLE); return ret ? 0 : -EINVAL; |
b778ae253
|
659 660 |
} return 0; |
3ac7fe5a4
|
661 |
} |
f8ff04e2b
|
662 |
EXPORT_SYMBOL_GPL(debug_object_activate); |
3ac7fe5a4
|
663 664 665 666 667 668 669 670 671 672 673 |
/** * debug_object_deactivate - debug checks when an object is deactivated * @addr: address of the object * @descr: pointer to an object specific debug description structure */ void debug_object_deactivate(void *addr, struct debug_obj_descr *descr) { struct debug_bucket *db; struct debug_obj *obj; unsigned long flags; |
d5f34153e
|
674 |
bool print_object = false; |
3ac7fe5a4
|
675 676 677 678 679 |
if (!debug_objects_enabled) return; db = get_bucket((unsigned long) addr); |
aef9cb052
|
680 |
raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a4
|
681 682 683 684 685 686 687 |
obj = lookup_object(addr, db); if (obj) { switch (obj->state) { case ODEBUG_STATE_INIT: case ODEBUG_STATE_INACTIVE: case ODEBUG_STATE_ACTIVE: |
a5d8e467f
|
688 689 690 |
if (!obj->astate) obj->state = ODEBUG_STATE_INACTIVE; else |
d5f34153e
|
691 |
print_object = true; |
3ac7fe5a4
|
692 693 694 |
break; case ODEBUG_STATE_DESTROYED: |
d5f34153e
|
695 |
print_object = true; |
3ac7fe5a4
|
696 697 698 699 |
break; default: break; } |
d5f34153e
|
700 701 702 703 |
} raw_spin_unlock_irqrestore(&db->lock, flags); if (!obj) { |
3ac7fe5a4
|
704 705 706 707 708 |
struct debug_obj o = { .object = addr, .state = ODEBUG_STATE_NOTAVAILABLE, .descr = descr }; debug_print_object(&o, "deactivate"); |
d5f34153e
|
709 710 |
} else if (print_object) { debug_print_object(obj, "deactivate"); |
3ac7fe5a4
|
711 |
} |
3ac7fe5a4
|
712 |
} |
f8ff04e2b
|
713 |
EXPORT_SYMBOL_GPL(debug_object_deactivate); |
3ac7fe5a4
|
714 715 716 717 718 719 720 721 722 723 724 725 |
/** * debug_object_destroy - debug checks when an object is destroyed * @addr: address of the object * @descr: pointer to an object specific debug description structure */ void debug_object_destroy(void *addr, struct debug_obj_descr *descr) { enum debug_obj_state state; struct debug_bucket *db; struct debug_obj *obj; unsigned long flags; |
d5f34153e
|
726 |
bool print_object = false; |
3ac7fe5a4
|
727 728 729 730 731 |
if (!debug_objects_enabled) return; db = get_bucket((unsigned long) addr); |
aef9cb052
|
732 |
raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a4
|
733 734 735 736 737 738 739 740 741 742 743 744 |
obj = lookup_object(addr, db); if (!obj) goto out_unlock; switch (obj->state) { case ODEBUG_STATE_NONE: case ODEBUG_STATE_INIT: case ODEBUG_STATE_INACTIVE: obj->state = ODEBUG_STATE_DESTROYED; break; case ODEBUG_STATE_ACTIVE: |
3ac7fe5a4
|
745 |
state = obj->state; |
aef9cb052
|
746 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
d5f34153e
|
747 |
debug_print_object(obj, "destroy"); |
3ac7fe5a4
|
748 749 750 751 |
debug_object_fixup(descr->fixup_destroy, addr, state); return; case ODEBUG_STATE_DESTROYED: |
d5f34153e
|
752 |
print_object = true; |
3ac7fe5a4
|
753 754 755 756 757 |
break; default: break; } out_unlock: |
aef9cb052
|
758 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
d5f34153e
|
759 760 |
if (print_object) debug_print_object(obj, "destroy"); |
3ac7fe5a4
|
761 |
} |
f8ff04e2b
|
762 |
EXPORT_SYMBOL_GPL(debug_object_destroy); |
3ac7fe5a4
|
763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 |
/** * debug_object_free - debug checks when an object is freed * @addr: address of the object * @descr: pointer to an object specific debug description structure */ void debug_object_free(void *addr, struct debug_obj_descr *descr) { enum debug_obj_state state; struct debug_bucket *db; struct debug_obj *obj; unsigned long flags; if (!debug_objects_enabled) return; db = get_bucket((unsigned long) addr); |
aef9cb052
|
780 |
raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a4
|
781 782 783 784 785 786 787 |
obj = lookup_object(addr, db); if (!obj) goto out_unlock; switch (obj->state) { case ODEBUG_STATE_ACTIVE: |
3ac7fe5a4
|
788 |
state = obj->state; |
aef9cb052
|
789 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
d5f34153e
|
790 |
debug_print_object(obj, "free"); |
3ac7fe5a4
|
791 792 793 794 |
debug_object_fixup(descr->fixup_free, addr, state); return; default: hlist_del(&obj->node); |
aef9cb052
|
795 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a4
|
796 |
free_object(obj); |
673d62cc5
|
797 |
return; |
3ac7fe5a4
|
798 799 |
} out_unlock: |
aef9cb052
|
800 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a4
|
801 |
} |
f8ff04e2b
|
802 |
EXPORT_SYMBOL_GPL(debug_object_free); |
3ac7fe5a4
|
803 |
|
a5d8e467f
|
804 |
/** |
b84d435cc
|
805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 |
* debug_object_assert_init - debug checks when object should be init-ed * @addr: address of the object * @descr: pointer to an object specific debug description structure */ void debug_object_assert_init(void *addr, struct debug_obj_descr *descr) { struct debug_bucket *db; struct debug_obj *obj; unsigned long flags; if (!debug_objects_enabled) return; db = get_bucket((unsigned long) addr); raw_spin_lock_irqsave(&db->lock, flags); obj = lookup_object(addr, db); if (!obj) { struct debug_obj o = { .object = addr, .state = ODEBUG_STATE_NOTAVAILABLE, .descr = descr }; raw_spin_unlock_irqrestore(&db->lock, flags); /* |
b9fdac7f6
|
830 831 832 |
* Maybe the object is static, and we let the type specific * code confirm. Track this static object if true, else invoke * fixup. |
b84d435cc
|
833 |
*/ |
b9fdac7f6
|
834 835 836 837 |
if (descr->is_static_object && descr->is_static_object(addr)) { /* Track this static object */ debug_object_init(addr, descr); } else { |
b84d435cc
|
838 |
debug_print_object(&o, "assert_init"); |
b9fdac7f6
|
839 840 841 |
debug_object_fixup(descr->fixup_assert_init, addr, ODEBUG_STATE_NOTAVAILABLE); } |
b84d435cc
|
842 843 844 845 846 |
return; } raw_spin_unlock_irqrestore(&db->lock, flags); } |
f8ff04e2b
|
847 |
EXPORT_SYMBOL_GPL(debug_object_assert_init); |
b84d435cc
|
848 849 |
/** |
a5d8e467f
|
850 851 852 853 854 855 856 857 858 859 860 861 862 |
* debug_object_active_state - debug checks object usage state machine * @addr: address of the object * @descr: pointer to an object specific debug description structure * @expect: expected state * @next: state to move to if expected state is found */ void debug_object_active_state(void *addr, struct debug_obj_descr *descr, unsigned int expect, unsigned int next) { struct debug_bucket *db; struct debug_obj *obj; unsigned long flags; |
d5f34153e
|
863 |
bool print_object = false; |
a5d8e467f
|
864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 |
if (!debug_objects_enabled) return; db = get_bucket((unsigned long) addr); raw_spin_lock_irqsave(&db->lock, flags); obj = lookup_object(addr, db); if (obj) { switch (obj->state) { case ODEBUG_STATE_ACTIVE: if (obj->astate == expect) obj->astate = next; else |
d5f34153e
|
879 |
print_object = true; |
a5d8e467f
|
880 881 882 |
break; default: |
d5f34153e
|
883 |
print_object = true; |
a5d8e467f
|
884 885 |
break; } |
d5f34153e
|
886 887 888 889 |
} raw_spin_unlock_irqrestore(&db->lock, flags); if (!obj) { |
a5d8e467f
|
890 891 892 893 894 |
struct debug_obj o = { .object = addr, .state = ODEBUG_STATE_NOTAVAILABLE, .descr = descr }; debug_print_object(&o, "active_state"); |
d5f34153e
|
895 896 |
} else if (print_object) { debug_print_object(obj, "active_state"); |
a5d8e467f
|
897 |
} |
a5d8e467f
|
898 |
} |
f8ff04e2b
|
899 |
EXPORT_SYMBOL_GPL(debug_object_active_state); |
a5d8e467f
|
900 |
|
3ac7fe5a4
|
901 902 903 904 |
#ifdef CONFIG_DEBUG_OBJECTS_FREE static void __debug_check_no_obj_freed(const void *address, unsigned long size) { unsigned long flags, oaddr, saddr, eaddr, paddr, chunks; |
3ac7fe5a4
|
905 906 907 |
struct debug_obj_descr *descr; enum debug_obj_state state; struct debug_bucket *db; |
1ea9b98b0
|
908 |
struct hlist_node *tmp; |
3ac7fe5a4
|
909 |
struct debug_obj *obj; |
bd9dcd046
|
910 |
int cnt, objs_checked = 0; |
3ac7fe5a4
|
911 912 913 914 915 916 917 918 919 920 921 922 |
saddr = (unsigned long) address; eaddr = saddr + size; paddr = saddr & ODEBUG_CHUNK_MASK; chunks = ((eaddr - paddr) + (ODEBUG_CHUNK_SIZE - 1)); chunks >>= ODEBUG_CHUNK_SHIFT; for (;chunks > 0; chunks--, paddr += ODEBUG_CHUNK_SIZE) { db = get_bucket(paddr); repeat: cnt = 0; |
aef9cb052
|
923 |
raw_spin_lock_irqsave(&db->lock, flags); |
b67bfe0d4
|
924 |
hlist_for_each_entry_safe(obj, tmp, &db->list, node) { |
3ac7fe5a4
|
925 926 927 928 929 930 931 |
cnt++; oaddr = (unsigned long) obj->object; if (oaddr < saddr || oaddr >= eaddr) continue; switch (obj->state) { case ODEBUG_STATE_ACTIVE: |
3ac7fe5a4
|
932 933 |
descr = obj->descr; state = obj->state; |
aef9cb052
|
934 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
d5f34153e
|
935 |
debug_print_object(obj, "free"); |
3ac7fe5a4
|
936 937 938 939 940 |
debug_object_fixup(descr->fixup_free, (void *) oaddr, state); goto repeat; default: hlist_del(&obj->node); |
a7344a68a
|
941 |
__free_object(obj); |
3ac7fe5a4
|
942 943 944 |
break; } } |
aef9cb052
|
945 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
673d62cc5
|
946 |
|
3ac7fe5a4
|
947 948 |
if (cnt > debug_objects_maxchain) debug_objects_maxchain = cnt; |
bd9dcd046
|
949 950 |
objs_checked += cnt; |
3ac7fe5a4
|
951 |
} |
bd9dcd046
|
952 953 954 |
if (objs_checked > debug_objects_maxchecked) debug_objects_maxchecked = objs_checked; |
1ea9b98b0
|
955 956 |
/* Schedule work to actually kmem_cache_free() objects */ |
a7344a68a
|
957 958 959 960 |
if (!obj_freeing && obj_nr_tofree) { WRITE_ONCE(obj_freeing, true); schedule_delayed_work(&debug_obj_work, ODEBUG_FREE_WORK_DELAY); } |
3ac7fe5a4
|
961 962 963 964 965 966 967 968 969 970 971 972 973 |
} void debug_check_no_obj_freed(const void *address, unsigned long size) { if (debug_objects_enabled) __debug_check_no_obj_freed(address, size); } #endif #ifdef CONFIG_DEBUG_FS static int debug_stats_show(struct seq_file *m, void *v) { |
d86998b17
|
974 975 976 977 |
int cpu, obj_percpu_free = 0; for_each_possible_cpu(cpu) obj_percpu_free += per_cpu(percpu_obj_pool.obj_free, cpu); |
3ac7fe5a4
|
978 979 |
seq_printf(m, "max_chain :%d ", debug_objects_maxchain); |
bd9dcd046
|
980 981 |
seq_printf(m, "max_checked :%d ", debug_objects_maxchecked); |
3ac7fe5a4
|
982 983 984 985 |
seq_printf(m, "warnings :%d ", debug_objects_warnings); seq_printf(m, "fixups :%d ", debug_objects_fixups); |
d86998b17
|
986 987 988 989 |
seq_printf(m, "pool_free :%d ", obj_pool_free + obj_percpu_free); seq_printf(m, "pool_pcp_free :%d ", obj_percpu_free); |
3ac7fe5a4
|
990 991 |
seq_printf(m, "pool_min_free :%d ", obj_pool_min_free); |
d86998b17
|
992 993 |
seq_printf(m, "pool_used :%d ", obj_pool_used - obj_percpu_free); |
3ac7fe5a4
|
994 995 |
seq_printf(m, "pool_max_used :%d ", obj_pool_max_used); |
36c4ead6f
|
996 997 |
seq_printf(m, "on_free_list :%d ", obj_nr_tofree); |
0cad93c34
|
998 999 1000 1001 |
seq_printf(m, "objs_allocated:%d ", debug_objects_allocated); seq_printf(m, "objs_freed :%d ", debug_objects_freed); |
3ac7fe5a4
|
1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 |
return 0; } static int debug_stats_open(struct inode *inode, struct file *filp) { return single_open(filp, debug_stats_show, NULL); } static const struct file_operations debug_stats_fops = { .open = debug_stats_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; static int __init debug_objects_init_debugfs(void) { |
fecb0d95c
|
1019 |
struct dentry *dbgdir; |
3ac7fe5a4
|
1020 1021 1022 1023 1024 |
if (!debug_objects_enabled) return 0; dbgdir = debugfs_create_dir("debug_objects", NULL); |
3ac7fe5a4
|
1025 |
|
fecb0d95c
|
1026 |
debugfs_create_file("stats", 0444, dbgdir, NULL, &debug_stats_fops); |
3ac7fe5a4
|
1027 1028 |
return 0; |
3ac7fe5a4
|
1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 |
} __initcall(debug_objects_init_debugfs); #else static inline void debug_objects_init_debugfs(void) { } #endif #ifdef CONFIG_DEBUG_OBJECTS_SELFTEST /* Random data structure for the self test */ struct self_test { unsigned long dummy1[6]; int static_init; unsigned long dummy2[3]; }; static __initdata struct debug_obj_descr descr_type_test; |
b9fdac7f6
|
1046 1047 1048 1049 1050 1051 |
static bool __init is_static_object(void *addr) { struct self_test *obj = addr; return obj->static_init; } |
3ac7fe5a4
|
1052 1053 1054 1055 |
/* * fixup_init is called when: * - an active object is initialized */ |
b1e4d9d82
|
1056 |
static bool __init fixup_init(void *addr, enum debug_obj_state state) |
3ac7fe5a4
|
1057 1058 1059 1060 1061 1062 1063 |
{ struct self_test *obj = addr; switch (state) { case ODEBUG_STATE_ACTIVE: debug_object_deactivate(obj, &descr_type_test); debug_object_init(obj, &descr_type_test); |
b1e4d9d82
|
1064 |
return true; |
3ac7fe5a4
|
1065 |
default: |
b1e4d9d82
|
1066 |
return false; |
3ac7fe5a4
|
1067 1068 1069 1070 1071 1072 |
} } /* * fixup_activate is called when: * - an active object is activated |
b9fdac7f6
|
1073 |
* - an unknown non-static object is activated |
3ac7fe5a4
|
1074 |
*/ |
b1e4d9d82
|
1075 |
static bool __init fixup_activate(void *addr, enum debug_obj_state state) |
3ac7fe5a4
|
1076 1077 1078 1079 1080 |
{ struct self_test *obj = addr; switch (state) { case ODEBUG_STATE_NOTAVAILABLE: |
b1e4d9d82
|
1081 |
return true; |
3ac7fe5a4
|
1082 1083 1084 |
case ODEBUG_STATE_ACTIVE: debug_object_deactivate(obj, &descr_type_test); debug_object_activate(obj, &descr_type_test); |
b1e4d9d82
|
1085 |
return true; |
3ac7fe5a4
|
1086 1087 |
default: |
b1e4d9d82
|
1088 |
return false; |
3ac7fe5a4
|
1089 1090 1091 1092 1093 1094 1095 |
} } /* * fixup_destroy is called when: * - an active object is destroyed */ |
b1e4d9d82
|
1096 |
static bool __init fixup_destroy(void *addr, enum debug_obj_state state) |
3ac7fe5a4
|
1097 1098 1099 1100 1101 1102 1103 |
{ struct self_test *obj = addr; switch (state) { case ODEBUG_STATE_ACTIVE: debug_object_deactivate(obj, &descr_type_test); debug_object_destroy(obj, &descr_type_test); |
b1e4d9d82
|
1104 |
return true; |
3ac7fe5a4
|
1105 |
default: |
b1e4d9d82
|
1106 |
return false; |
3ac7fe5a4
|
1107 1108 1109 1110 1111 1112 1113 |
} } /* * fixup_free is called when: * - an active object is freed */ |
b1e4d9d82
|
1114 |
static bool __init fixup_free(void *addr, enum debug_obj_state state) |
3ac7fe5a4
|
1115 1116 1117 1118 1119 1120 1121 |
{ struct self_test *obj = addr; switch (state) { case ODEBUG_STATE_ACTIVE: debug_object_deactivate(obj, &descr_type_test); debug_object_free(obj, &descr_type_test); |
b1e4d9d82
|
1122 |
return true; |
3ac7fe5a4
|
1123 |
default: |
b1e4d9d82
|
1124 |
return false; |
3ac7fe5a4
|
1125 1126 |
} } |
1fb2f77c0
|
1127 |
static int __init |
3ac7fe5a4
|
1128 1129 1130 1131 1132 1133 1134 1135 |
check_results(void *addr, enum debug_obj_state state, int fixups, int warnings) { struct debug_bucket *db; struct debug_obj *obj; unsigned long flags; int res = -EINVAL; db = get_bucket((unsigned long) addr); |
aef9cb052
|
1136 |
raw_spin_lock_irqsave(&db->lock, flags); |
3ac7fe5a4
|
1137 1138 1139 |
obj = lookup_object(addr, db); if (!obj && state != ODEBUG_STATE_NONE) { |
5cd2b459d
|
1140 1141 |
WARN(1, KERN_ERR "ODEBUG: selftest object not found "); |
3ac7fe5a4
|
1142 1143 1144 |
goto out; } if (obj && obj->state != state) { |
5cd2b459d
|
1145 1146 |
WARN(1, KERN_ERR "ODEBUG: selftest wrong state: %d != %d ", |
3ac7fe5a4
|
1147 |
obj->state, state); |
3ac7fe5a4
|
1148 1149 1150 |
goto out; } if (fixups != debug_objects_fixups) { |
5cd2b459d
|
1151 1152 |
WARN(1, KERN_ERR "ODEBUG: selftest fixups failed %d != %d ", |
3ac7fe5a4
|
1153 |
fixups, debug_objects_fixups); |
3ac7fe5a4
|
1154 1155 1156 |
goto out; } if (warnings != debug_objects_warnings) { |
5cd2b459d
|
1157 1158 |
WARN(1, KERN_ERR "ODEBUG: selftest warnings failed %d != %d ", |
3ac7fe5a4
|
1159 |
warnings, debug_objects_warnings); |
3ac7fe5a4
|
1160 1161 1162 1163 |
goto out; } res = 0; out: |
aef9cb052
|
1164 |
raw_spin_unlock_irqrestore(&db->lock, flags); |
3ac7fe5a4
|
1165 1166 1167 1168 1169 1170 1171 |
if (res) debug_objects_enabled = 0; return res; } static __initdata struct debug_obj_descr descr_type_test = { .name = "selftest", |
b9fdac7f6
|
1172 |
.is_static_object = is_static_object, |
3ac7fe5a4
|
1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 |
.fixup_init = fixup_init, .fixup_activate = fixup_activate, .fixup_destroy = fixup_destroy, .fixup_free = fixup_free, }; static __initdata struct self_test obj = { .static_init = 0 }; static void __init debug_objects_selftest(void) { int fixups, oldfixups, warnings, oldwarnings; unsigned long flags; local_irq_save(flags); fixups = oldfixups = debug_objects_fixups; warnings = oldwarnings = debug_objects_warnings; descr_test = &descr_type_test; debug_object_init(&obj, &descr_type_test); if (check_results(&obj, ODEBUG_STATE_INIT, fixups, warnings)) goto out; debug_object_activate(&obj, &descr_type_test); if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings)) goto out; debug_object_activate(&obj, &descr_type_test); if (check_results(&obj, ODEBUG_STATE_ACTIVE, ++fixups, ++warnings)) goto out; debug_object_deactivate(&obj, &descr_type_test); if (check_results(&obj, ODEBUG_STATE_INACTIVE, fixups, warnings)) goto out; debug_object_destroy(&obj, &descr_type_test); if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, warnings)) goto out; debug_object_init(&obj, &descr_type_test); if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings)) goto out; debug_object_activate(&obj, &descr_type_test); if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings)) goto out; debug_object_deactivate(&obj, &descr_type_test); if (check_results(&obj, ODEBUG_STATE_DESTROYED, fixups, ++warnings)) goto out; debug_object_free(&obj, &descr_type_test); if (check_results(&obj, ODEBUG_STATE_NONE, fixups, warnings)) goto out; obj.static_init = 1; debug_object_activate(&obj, &descr_type_test); |
9f78ff005
|
1222 |
if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings)) |
3ac7fe5a4
|
1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 |
goto out; debug_object_init(&obj, &descr_type_test); if (check_results(&obj, ODEBUG_STATE_INIT, ++fixups, ++warnings)) goto out; debug_object_free(&obj, &descr_type_test); if (check_results(&obj, ODEBUG_STATE_NONE, fixups, warnings)) goto out; #ifdef CONFIG_DEBUG_OBJECTS_FREE debug_object_init(&obj, &descr_type_test); if (check_results(&obj, ODEBUG_STATE_INIT, fixups, warnings)) goto out; debug_object_activate(&obj, &descr_type_test); if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings)) goto out; __debug_check_no_obj_freed(&obj, sizeof(obj)); if (check_results(&obj, ODEBUG_STATE_NONE, ++fixups, ++warnings)) goto out; #endif |
719e48439
|
1242 1243 |
pr_info("selftest passed "); |
3ac7fe5a4
|
1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 |
out: debug_objects_fixups = oldfixups; debug_objects_warnings = oldwarnings; descr_test = NULL; local_irq_restore(flags); } #else static inline void debug_objects_selftest(void) { } #endif /* * Called during early boot to initialize the hash buckets and link * the static object pool objects into the poll list. After this call * the object tracker is fully operational. */ void __init debug_objects_early_init(void) { int i; for (i = 0; i < ODEBUG_HASH_SIZE; i++) |
aef9cb052
|
1266 |
raw_spin_lock_init(&obj_hash[i].lock); |
3ac7fe5a4
|
1267 1268 1269 1270 1271 1272 |
for (i = 0; i < ODEBUG_POOL_SIZE; i++) hlist_add_head(&obj_static_pool[i].node, &obj_pool); } /* |
1be1cb7b4
|
1273 1274 |
* Convert the statically allocated objects to dynamic ones: */ |
1fb2f77c0
|
1275 |
static int __init debug_objects_replace_static_objects(void) |
1be1cb7b4
|
1276 1277 |
{ struct debug_bucket *db = obj_hash; |
b67bfe0d4
|
1278 |
struct hlist_node *tmp; |
1be1cb7b4
|
1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 |
struct debug_obj *obj, *new; HLIST_HEAD(objects); int i, cnt = 0; for (i = 0; i < ODEBUG_POOL_SIZE; i++) { obj = kmem_cache_zalloc(obj_cache, GFP_KERNEL); if (!obj) goto free; hlist_add_head(&obj->node, &objects); } /* |
a9ee3a63d
|
1291 1292 1293 |
* debug_objects_mem_init() is now called early that only one CPU is up * and interrupts have been disabled, so it is safe to replace the * active object references. |
1be1cb7b4
|
1294 |
*/ |
1be1cb7b4
|
1295 1296 |
/* Remove the statically allocated objects from the pool */ |
b67bfe0d4
|
1297 |
hlist_for_each_entry_safe(obj, tmp, &obj_pool, node) |
1be1cb7b4
|
1298 1299 1300 1301 1302 1303 1304 |
hlist_del(&obj->node); /* Move the allocated objects to the pool */ hlist_move_list(&objects, &obj_pool); /* Replace the active object references */ for (i = 0; i < ODEBUG_HASH_SIZE; i++, db++) { hlist_move_list(&db->list, &objects); |
b67bfe0d4
|
1305 |
hlist_for_each_entry(obj, &objects, node) { |
1be1cb7b4
|
1306 1307 1308 1309 1310 1311 1312 1313 |
new = hlist_entry(obj_pool.first, typeof(*obj), node); hlist_del(&new->node); /* copy object data */ *new = *obj; hlist_add_head(&new->node, &db->list); cnt++; } } |
c0f35cc0b
|
1314 1315 1316 |
pr_debug("%d of %d active objects replaced ", cnt, obj_pool_used); |
1be1cb7b4
|
1317 1318 |
return 0; free: |
b67bfe0d4
|
1319 |
hlist_for_each_entry_safe(obj, tmp, &objects, node) { |
1be1cb7b4
|
1320 1321 1322 1323 1324 1325 1326 |
hlist_del(&obj->node); kmem_cache_free(obj_cache, obj); } return -ENOMEM; } /* |
3ac7fe5a4
|
1327 1328 1329 1330 1331 1332 1333 |
* Called after the kmem_caches are functional to setup a dedicated * cache pool, which has the SLAB_DEBUG_OBJECTS flag set. This flag * prevents that the debug code is called on kmem_cache_free() for the * debug tracker objects to avoid recursive calls. */ void __init debug_objects_mem_init(void) { |
634d61f45
|
1334 |
int cpu, extras; |
d86998b17
|
1335 |
|
3ac7fe5a4
|
1336 1337 |
if (!debug_objects_enabled) return; |
d86998b17
|
1338 1339 1340 1341 1342 1343 1344 1345 |
/* * Initialize the percpu object pools * * Initialization is not strictly necessary, but was done for * completeness. */ for_each_possible_cpu(cpu) INIT_HLIST_HEAD(&per_cpu(percpu_obj_pool.free_objs, cpu)); |
3ac7fe5a4
|
1346 1347 |
obj_cache = kmem_cache_create("debug_objects_cache", sizeof (struct debug_obj), 0, |
8de456cf8
|
1348 1349 |
SLAB_DEBUG_OBJECTS | SLAB_NOLEAKTRACE, NULL); |
3ac7fe5a4
|
1350 |
|
1be1cb7b4
|
1351 |
if (!obj_cache || debug_objects_replace_static_objects()) { |
3ac7fe5a4
|
1352 |
debug_objects_enabled = 0; |
3ff4f80a7
|
1353 |
kmem_cache_destroy(obj_cache); |
719e48439
|
1354 1355 |
pr_warn("out of memory. "); |
1be1cb7b4
|
1356 |
} else |
3ac7fe5a4
|
1357 |
debug_objects_selftest(); |
634d61f45
|
1358 1359 1360 1361 1362 1363 1364 1365 |
/* * Increase the thresholds for allocating and freeing objects * according to the number of possible CPUs available in the system. */ extras = num_possible_cpus() * ODEBUG_BATCH_SIZE; debug_objects_pool_size += extras; debug_objects_pool_min_level += extras; |
3ac7fe5a4
|
1366 |
} |