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![Zqiang](/assets/img/avatar_default.png)
If a CPU is offlined the debug objects per CPU pool is not cleaned up. If the CPU is never onlined again then the objects in the pool are wasted. Add a CPU hotplug callback which is invoked after the CPU is dead to free the pool. [ tglx: Massaged changelog and added comment about remote access safety ] Signed-off-by: Zqiang <qiang.zhang@windriver.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Waiman Long <longman@redhat.com> Link: https://lore.kernel.org/r/20200908062709.11441-1-qiang.zhang@windriver.com
1402 lines
35 KiB
C
1402 lines
35 KiB
C
/*
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* Generic infrastructure for lifetime debugging of objects.
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*
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* Started by Thomas Gleixner
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*
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* Copyright (C) 2008, Thomas Gleixner <tglx@linutronix.de>
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*
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* For licencing details see kernel-base/COPYING
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*/
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#define pr_fmt(fmt) "ODEBUG: " fmt
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#include <linux/debugobjects.h>
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#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>
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#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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#include <linux/cpu.h>
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#define ODEBUG_HASH_BITS 14
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#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
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#define ODEBUG_CHUNK_SIZE (1 << ODEBUG_CHUNK_SHIFT)
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#define ODEBUG_CHUNK_MASK (~(ODEBUG_CHUNK_SIZE - 1))
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/*
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* We limit the freeing of debug objects via workqueue at a maximum
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* frequency of 10Hz and about 1024 objects for each freeing operation.
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* So it is freeing at most 10k debug objects per second.
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*/
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#define ODEBUG_FREE_WORK_MAX 1024
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#define ODEBUG_FREE_WORK_DELAY DIV_ROUND_UP(HZ, 10)
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struct debug_bucket {
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struct hlist_head list;
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raw_spinlock_t lock;
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};
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/*
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* Debug object percpu free list
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* Access is protected by disabling irq
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*/
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struct debug_percpu_free {
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struct hlist_head free_objs;
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int obj_free;
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};
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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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/*
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* Because of the presence of percpu free pools, obj_pool_free will
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* under-count those in the percpu free pools. Similarly, obj_pool_used
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* will over-count those in the percpu free pools. Adjustments will be
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* made at debug_stats_show(). Both obj_pool_min_free and obj_pool_max_used
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* can be off.
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*/
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static int obj_pool_min_free = ODEBUG_POOL_SIZE;
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static int obj_pool_free = ODEBUG_POOL_SIZE;
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static int obj_pool_used;
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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 */
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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;
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static int debug_objects_warnings __read_mostly;
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static int debug_objects_enabled __read_mostly
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= CONFIG_DEBUG_OBJECTS_ENABLE_DEFAULT;
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static int debug_objects_pool_size __read_mostly
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= ODEBUG_POOL_SIZE;
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static int debug_objects_pool_min_level __read_mostly
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= ODEBUG_POOL_MIN_LEVEL;
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static const 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)
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{
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debug_objects_enabled = 1;
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return 0;
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}
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static int __init disable_object_debug(char *str)
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{
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debug_objects_enabled = 0;
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return 0;
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}
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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] = {
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[ODEBUG_STATE_NONE] = "none",
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[ODEBUG_STATE_INIT] = "initialized",
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[ODEBUG_STATE_INACTIVE] = "inactive",
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[ODEBUG_STATE_ACTIVE] = "active",
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[ODEBUG_STATE_DESTROYED] = "destroyed",
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[ODEBUG_STATE_NOTAVAILABLE] = "not available",
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};
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static void fill_pool(void)
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{
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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(READ_ONCE(obj_pool_free) >= debug_objects_pool_min_level))
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return;
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/*
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* Reuse objs from the global free list; they will be reinitialized
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* when allocating.
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*
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* Both obj_nr_tofree and obj_pool_free are checked locklessly; the
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* READ_ONCE()s pair with the WRITE_ONCE()s in pool_lock critical
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* sections.
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*/
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while (READ_ONCE(obj_nr_tofree) && (READ_ONCE(obj_pool_free) < obj_pool_min_free)) {
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raw_spin_lock_irqsave(&pool_lock, flags);
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/*
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* Recheck with the lock held as the worker thread might have
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* won the race and freed the global free list already.
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*/
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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);
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hlist_del(&obj->node);
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WRITE_ONCE(obj_nr_tofree, obj_nr_tofree - 1);
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hlist_add_head(&obj->node, &obj_pool);
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WRITE_ONCE(obj_pool_free, obj_pool_free + 1);
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}
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raw_spin_unlock_irqrestore(&pool_lock, flags);
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}
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if (unlikely(!obj_cache))
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return;
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while (READ_ONCE(obj_pool_free) < debug_objects_pool_min_level) {
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struct debug_obj *new[ODEBUG_BATCH_SIZE];
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int cnt;
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for (cnt = 0; cnt < ODEBUG_BATCH_SIZE; cnt++) {
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new[cnt] = kmem_cache_zalloc(obj_cache, gfp);
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if (!new[cnt])
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break;
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}
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if (!cnt)
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return;
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raw_spin_lock_irqsave(&pool_lock, flags);
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while (cnt) {
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hlist_add_head(&new[--cnt]->node, &obj_pool);
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debug_objects_allocated++;
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WRITE_ONCE(obj_pool_free, obj_pool_free + 1);
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}
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raw_spin_unlock_irqrestore(&pool_lock, flags);
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}
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}
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/*
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* Lookup an object in the hash bucket.
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*/
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static struct debug_obj *lookup_object(void *addr, struct debug_bucket *b)
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{
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struct debug_obj *obj;
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int cnt = 0;
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hlist_for_each_entry(obj, &b->list, node) {
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cnt++;
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if (obj->object == addr)
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return obj;
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}
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if (cnt > debug_objects_maxchain)
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debug_objects_maxchain = cnt;
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return NULL;
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}
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/*
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* Allocate a new object from the hlist
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*/
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static struct debug_obj *__alloc_object(struct hlist_head *list)
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{
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struct debug_obj *obj = NULL;
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if (list->first) {
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obj = hlist_entry(list->first, typeof(*obj), node);
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hlist_del(&obj->node);
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}
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return obj;
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}
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/*
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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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*/
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static struct debug_obj *
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alloc_object(void *addr, struct debug_bucket *b, const struct debug_obj_descr *descr)
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{
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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);
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if (obj) {
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percpu_pool->obj_free--;
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goto init_obj;
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}
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}
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raw_spin_lock(&pool_lock);
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obj = __alloc_object(&obj_pool);
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if (obj) {
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obj_pool_used++;
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WRITE_ONCE(obj_pool_free, obj_pool_free - 1);
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/*
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* Looking ahead, allocate one batch of debug objects and
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* put them into the percpu free pool.
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*/
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if (likely(obj_cache)) {
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int i;
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for (i = 0; i < ODEBUG_BATCH_SIZE; i++) {
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struct debug_obj *obj2;
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obj2 = __alloc_object(&obj_pool);
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if (!obj2)
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break;
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hlist_add_head(&obj2->node,
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&percpu_pool->free_objs);
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percpu_pool->obj_free++;
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obj_pool_used++;
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WRITE_ONCE(obj_pool_free, obj_pool_free - 1);
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}
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}
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if (obj_pool_used > obj_pool_max_used)
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obj_pool_max_used = obj_pool_used;
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if (obj_pool_free < obj_pool_min_free)
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obj_pool_min_free = obj_pool_free;
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}
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raw_spin_unlock(&pool_lock);
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init_obj:
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if (obj) {
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obj->object = addr;
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obj->descr = descr;
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obj->state = ODEBUG_STATE_NONE;
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obj->astate = 0;
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hlist_add_head(&obj->node, &b->list);
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}
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return obj;
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}
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/*
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* workqueue function to free objects.
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*
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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;
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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))
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return;
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if (obj_pool_free >= debug_objects_pool_size)
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goto free_objs;
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/*
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* The objs on the pool list might be allocated before the work is
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* 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
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* may be gearing up to use more and more objects, don't free any
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* of them until the next round.
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*/
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while (obj_nr_tofree && obj_pool_free < debug_objects_pool_size) {
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obj = hlist_entry(obj_to_free.first, typeof(*obj), node);
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hlist_del(&obj->node);
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hlist_add_head(&obj->node, &obj_pool);
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WRITE_ONCE(obj_pool_free, obj_pool_free + 1);
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WRITE_ONCE(obj_nr_tofree, obj_nr_tofree - 1);
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}
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raw_spin_unlock_irqrestore(&pool_lock, flags);
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return;
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free_objs:
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/*
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* Pool list is already full and there are still objs on the free
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* list. Move remaining free objs to a temporary list to free the
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* memory outside the pool_lock held region.
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*/
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if (obj_nr_tofree) {
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hlist_move_list(&obj_to_free, &tofree);
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debug_objects_freed += obj_nr_tofree;
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WRITE_ONCE(obj_nr_tofree, 0);
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}
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raw_spin_unlock_irqrestore(&pool_lock, flags);
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hlist_for_each_entry_safe(obj, tmp, &tofree, node) {
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hlist_del(&obj->node);
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kmem_cache_free(obj_cache, obj);
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}
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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];
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struct debug_percpu_free *percpu_pool;
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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)
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goto free_to_obj_pool;
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/*
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* Try to free it into the percpu pool first.
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*/
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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);
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percpu_pool->obj_free++;
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local_irq_restore(flags);
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return;
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}
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/*
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* As the percpu pool is full, look ahead and pull out a batch
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* of objects from the percpu pool and free them as well.
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*/
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for (; lookahead_count < ODEBUG_BATCH_SIZE; lookahead_count++) {
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objs[lookahead_count] = __alloc_object(&percpu_pool->free_objs);
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if (!objs[lookahead_count])
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break;
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percpu_pool->obj_free--;
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}
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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 &&
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(obj_nr_tofree < ODEBUG_FREE_WORK_MAX);
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obj_pool_used--;
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if (work) {
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WRITE_ONCE(obj_nr_tofree, obj_nr_tofree + 1);
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hlist_add_head(&obj->node, &obj_to_free);
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if (lookahead_count) {
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WRITE_ONCE(obj_nr_tofree, obj_nr_tofree + lookahead_count);
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obj_pool_used -= lookahead_count;
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while (lookahead_count) {
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hlist_add_head(&objs[--lookahead_count]->node,
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&obj_to_free);
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}
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}
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if ((obj_pool_free > debug_objects_pool_size) &&
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(obj_nr_tofree < ODEBUG_FREE_WORK_MAX)) {
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int i;
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/*
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* Free one more batch of objects from obj_pool.
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*/
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for (i = 0; i < ODEBUG_BATCH_SIZE; i++) {
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obj = __alloc_object(&obj_pool);
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hlist_add_head(&obj->node, &obj_to_free);
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WRITE_ONCE(obj_pool_free, obj_pool_free - 1);
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WRITE_ONCE(obj_nr_tofree, obj_nr_tofree + 1);
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}
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}
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} else {
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WRITE_ONCE(obj_pool_free, obj_pool_free + 1);
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hlist_add_head(&obj->node, &obj_pool);
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if (lookahead_count) {
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WRITE_ONCE(obj_pool_free, obj_pool_free + lookahead_count);
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obj_pool_used -= lookahead_count;
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while (lookahead_count) {
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hlist_add_head(&objs[--lookahead_count]->node,
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&obj_pool);
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}
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}
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}
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raw_spin_unlock(&pool_lock);
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local_irq_restore(flags);
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}
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/*
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* Put the object back into the pool and schedule work to free objects
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* if necessary.
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*/
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static void free_object(struct debug_obj *obj)
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{
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__free_object(obj);
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if (!READ_ONCE(obj_freeing) && READ_ONCE(obj_nr_tofree)) {
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WRITE_ONCE(obj_freeing, true);
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schedule_delayed_work(&debug_obj_work, ODEBUG_FREE_WORK_DELAY);
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}
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}
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|
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#ifdef CONFIG_HOTPLUG_CPU
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static int object_cpu_offline(unsigned int cpu)
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{
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struct debug_percpu_free *percpu_pool;
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struct hlist_node *tmp;
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struct debug_obj *obj;
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/* Remote access is safe as the CPU is dead already */
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percpu_pool = per_cpu_ptr(&percpu_obj_pool, cpu);
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hlist_for_each_entry_safe(obj, tmp, &percpu_pool->free_objs, node) {
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hlist_del(&obj->node);
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kmem_cache_free(obj_cache, obj);
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}
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percpu_pool->obj_free = 0;
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return 0;
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}
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#endif
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|
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/*
|
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* We run out of memory. That means we probably have tons of objects
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* allocated.
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*/
|
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static void debug_objects_oom(void)
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{
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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;
|
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unsigned long flags;
|
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int i;
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pr_warn("Out of memory. ODEBUG disabled\n");
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|
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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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|
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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);
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free_object(obj);
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}
|
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}
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}
|
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|
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/*
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* We use the pfn of the address for the hash. That way we can check
|
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* for freed objects simply by checking the affected bucket.
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*/
|
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static struct debug_bucket *get_bucket(unsigned long addr)
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{
|
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unsigned long hash;
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|
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hash = hash_long((addr >> ODEBUG_CHUNK_SHIFT), ODEBUG_HASH_BITS);
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return &obj_hash[hash];
|
|
}
|
|
|
|
static void debug_print_object(struct debug_obj *obj, char *msg)
|
|
{
|
|
const struct debug_obj_descr *descr = obj->descr;
|
|
static int limit;
|
|
|
|
if (limit < 5 && descr != descr_test) {
|
|
void *hint = descr->debug_hint ?
|
|
descr->debug_hint(obj->object) : NULL;
|
|
limit++;
|
|
WARN(1, KERN_ERR "ODEBUG: %s %s (active state %u) "
|
|
"object type: %s hint: %pS\n",
|
|
msg, obj_states[obj->state], obj->astate,
|
|
descr->name, hint);
|
|
}
|
|
debug_objects_warnings++;
|
|
}
|
|
|
|
/*
|
|
* Try to repair the damage, so we have a better chance to get useful
|
|
* debug output.
|
|
*/
|
|
static bool
|
|
debug_object_fixup(bool (*fixup)(void *addr, enum debug_obj_state state),
|
|
void * addr, enum debug_obj_state state)
|
|
{
|
|
if (fixup && fixup(addr, state)) {
|
|
debug_objects_fixups++;
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static void debug_object_is_on_stack(void *addr, int onstack)
|
|
{
|
|
int is_on_stack;
|
|
static int limit;
|
|
|
|
if (limit > 4)
|
|
return;
|
|
|
|
is_on_stack = object_is_on_stack(addr);
|
|
if (is_on_stack == onstack)
|
|
return;
|
|
|
|
limit++;
|
|
if (is_on_stack)
|
|
pr_warn("object %p is on stack %p, but NOT annotated.\n", addr,
|
|
task_stack_page(current));
|
|
else
|
|
pr_warn("object %p is NOT on stack %p, but annotated.\n", addr,
|
|
task_stack_page(current));
|
|
|
|
WARN_ON(1);
|
|
}
|
|
|
|
static void
|
|
__debug_object_init(void *addr, const struct debug_obj_descr *descr, int onstack)
|
|
{
|
|
enum debug_obj_state state;
|
|
bool check_stack = false;
|
|
struct debug_bucket *db;
|
|
struct debug_obj *obj;
|
|
unsigned long flags;
|
|
|
|
fill_pool();
|
|
|
|
db = get_bucket((unsigned long) addr);
|
|
|
|
raw_spin_lock_irqsave(&db->lock, flags);
|
|
|
|
obj = lookup_object(addr, db);
|
|
if (!obj) {
|
|
obj = alloc_object(addr, db, descr);
|
|
if (!obj) {
|
|
debug_objects_enabled = 0;
|
|
raw_spin_unlock_irqrestore(&db->lock, flags);
|
|
debug_objects_oom();
|
|
return;
|
|
}
|
|
check_stack = true;
|
|
}
|
|
|
|
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:
|
|
state = obj->state;
|
|
raw_spin_unlock_irqrestore(&db->lock, flags);
|
|
debug_print_object(obj, "init");
|
|
debug_object_fixup(descr->fixup_init, addr, state);
|
|
return;
|
|
|
|
case ODEBUG_STATE_DESTROYED:
|
|
raw_spin_unlock_irqrestore(&db->lock, flags);
|
|
debug_print_object(obj, "init");
|
|
return;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
raw_spin_unlock_irqrestore(&db->lock, flags);
|
|
if (check_stack)
|
|
debug_object_is_on_stack(addr, onstack);
|
|
}
|
|
|
|
/**
|
|
* 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, const struct debug_obj_descr *descr)
|
|
{
|
|
if (!debug_objects_enabled)
|
|
return;
|
|
|
|
__debug_object_init(addr, descr, 0);
|
|
}
|
|
EXPORT_SYMBOL_GPL(debug_object_init);
|
|
|
|
/**
|
|
* 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, const struct debug_obj_descr *descr)
|
|
{
|
|
if (!debug_objects_enabled)
|
|
return;
|
|
|
|
__debug_object_init(addr, descr, 1);
|
|
}
|
|
EXPORT_SYMBOL_GPL(debug_object_init_on_stack);
|
|
|
|
/**
|
|
* debug_object_activate - debug checks when an object is activated
|
|
* @addr: address of the object
|
|
* @descr: pointer to an object specific debug description structure
|
|
* Returns 0 for success, -EINVAL for check failed.
|
|
*/
|
|
int debug_object_activate(void *addr, const struct debug_obj_descr *descr)
|
|
{
|
|
enum debug_obj_state state;
|
|
struct debug_bucket *db;
|
|
struct debug_obj *obj;
|
|
unsigned long flags;
|
|
int ret;
|
|
struct debug_obj o = { .object = addr,
|
|
.state = ODEBUG_STATE_NOTAVAILABLE,
|
|
.descr = descr };
|
|
|
|
if (!debug_objects_enabled)
|
|
return 0;
|
|
|
|
db = get_bucket((unsigned long) addr);
|
|
|
|
raw_spin_lock_irqsave(&db->lock, flags);
|
|
|
|
obj = lookup_object(addr, db);
|
|
if (obj) {
|
|
bool print_object = false;
|
|
|
|
switch (obj->state) {
|
|
case ODEBUG_STATE_INIT:
|
|
case ODEBUG_STATE_INACTIVE:
|
|
obj->state = ODEBUG_STATE_ACTIVE;
|
|
ret = 0;
|
|
break;
|
|
|
|
case ODEBUG_STATE_ACTIVE:
|
|
state = obj->state;
|
|
raw_spin_unlock_irqrestore(&db->lock, flags);
|
|
debug_print_object(obj, "activate");
|
|
ret = debug_object_fixup(descr->fixup_activate, addr, state);
|
|
return ret ? 0 : -EINVAL;
|
|
|
|
case ODEBUG_STATE_DESTROYED:
|
|
print_object = true;
|
|
ret = -EINVAL;
|
|
break;
|
|
default:
|
|
ret = 0;
|
|
break;
|
|
}
|
|
raw_spin_unlock_irqrestore(&db->lock, flags);
|
|
if (print_object)
|
|
debug_print_object(obj, "activate");
|
|
return ret;
|
|
}
|
|
|
|
raw_spin_unlock_irqrestore(&db->lock, flags);
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
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 {
|
|
debug_print_object(&o, "activate");
|
|
ret = debug_object_fixup(descr->fixup_activate, addr,
|
|
ODEBUG_STATE_NOTAVAILABLE);
|
|
return ret ? 0 : -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(debug_object_activate);
|
|
|
|
/**
|
|
* 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, const struct debug_obj_descr *descr)
|
|
{
|
|
struct debug_bucket *db;
|
|
struct debug_obj *obj;
|
|
unsigned long flags;
|
|
bool print_object = false;
|
|
|
|
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_INIT:
|
|
case ODEBUG_STATE_INACTIVE:
|
|
case ODEBUG_STATE_ACTIVE:
|
|
if (!obj->astate)
|
|
obj->state = ODEBUG_STATE_INACTIVE;
|
|
else
|
|
print_object = true;
|
|
break;
|
|
|
|
case ODEBUG_STATE_DESTROYED:
|
|
print_object = true;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
raw_spin_unlock_irqrestore(&db->lock, flags);
|
|
if (!obj) {
|
|
struct debug_obj o = { .object = addr,
|
|
.state = ODEBUG_STATE_NOTAVAILABLE,
|
|
.descr = descr };
|
|
|
|
debug_print_object(&o, "deactivate");
|
|
} else if (print_object) {
|
|
debug_print_object(obj, "deactivate");
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(debug_object_deactivate);
|
|
|
|
/**
|
|
* 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, const struct debug_obj_descr *descr)
|
|
{
|
|
enum debug_obj_state state;
|
|
struct debug_bucket *db;
|
|
struct debug_obj *obj;
|
|
unsigned long flags;
|
|
bool print_object = false;
|
|
|
|
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)
|
|
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:
|
|
state = obj->state;
|
|
raw_spin_unlock_irqrestore(&db->lock, flags);
|
|
debug_print_object(obj, "destroy");
|
|
debug_object_fixup(descr->fixup_destroy, addr, state);
|
|
return;
|
|
|
|
case ODEBUG_STATE_DESTROYED:
|
|
print_object = true;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
out_unlock:
|
|
raw_spin_unlock_irqrestore(&db->lock, flags);
|
|
if (print_object)
|
|
debug_print_object(obj, "destroy");
|
|
}
|
|
EXPORT_SYMBOL_GPL(debug_object_destroy);
|
|
|
|
/**
|
|
* 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, const 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);
|
|
|
|
raw_spin_lock_irqsave(&db->lock, flags);
|
|
|
|
obj = lookup_object(addr, db);
|
|
if (!obj)
|
|
goto out_unlock;
|
|
|
|
switch (obj->state) {
|
|
case ODEBUG_STATE_ACTIVE:
|
|
state = obj->state;
|
|
raw_spin_unlock_irqrestore(&db->lock, flags);
|
|
debug_print_object(obj, "free");
|
|
debug_object_fixup(descr->fixup_free, addr, state);
|
|
return;
|
|
default:
|
|
hlist_del(&obj->node);
|
|
raw_spin_unlock_irqrestore(&db->lock, flags);
|
|
free_object(obj);
|
|
return;
|
|
}
|
|
out_unlock:
|
|
raw_spin_unlock_irqrestore(&db->lock, flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(debug_object_free);
|
|
|
|
/**
|
|
* 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, const 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);
|
|
/*
|
|
* Maybe the object is static, and we let the type specific
|
|
* code confirm. Track this static object if true, else invoke
|
|
* fixup.
|
|
*/
|
|
if (descr->is_static_object && descr->is_static_object(addr)) {
|
|
/* Track this static object */
|
|
debug_object_init(addr, descr);
|
|
} else {
|
|
debug_print_object(&o, "assert_init");
|
|
debug_object_fixup(descr->fixup_assert_init, addr,
|
|
ODEBUG_STATE_NOTAVAILABLE);
|
|
}
|
|
return;
|
|
}
|
|
|
|
raw_spin_unlock_irqrestore(&db->lock, flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(debug_object_assert_init);
|
|
|
|
/**
|
|
* 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, const struct debug_obj_descr *descr,
|
|
unsigned int expect, unsigned int next)
|
|
{
|
|
struct debug_bucket *db;
|
|
struct debug_obj *obj;
|
|
unsigned long flags;
|
|
bool print_object = false;
|
|
|
|
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
|
|
print_object = true;
|
|
break;
|
|
|
|
default:
|
|
print_object = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
raw_spin_unlock_irqrestore(&db->lock, flags);
|
|
if (!obj) {
|
|
struct debug_obj o = { .object = addr,
|
|
.state = ODEBUG_STATE_NOTAVAILABLE,
|
|
.descr = descr };
|
|
|
|
debug_print_object(&o, "active_state");
|
|
} else if (print_object) {
|
|
debug_print_object(obj, "active_state");
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(debug_object_active_state);
|
|
|
|
#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;
|
|
const struct debug_obj_descr *descr;
|
|
enum debug_obj_state state;
|
|
struct debug_bucket *db;
|
|
struct hlist_node *tmp;
|
|
struct debug_obj *obj;
|
|
int cnt, objs_checked = 0;
|
|
|
|
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;
|
|
raw_spin_lock_irqsave(&db->lock, flags);
|
|
hlist_for_each_entry_safe(obj, tmp, &db->list, node) {
|
|
cnt++;
|
|
oaddr = (unsigned long) obj->object;
|
|
if (oaddr < saddr || oaddr >= eaddr)
|
|
continue;
|
|
|
|
switch (obj->state) {
|
|
case ODEBUG_STATE_ACTIVE:
|
|
descr = obj->descr;
|
|
state = obj->state;
|
|
raw_spin_unlock_irqrestore(&db->lock, flags);
|
|
debug_print_object(obj, "free");
|
|
debug_object_fixup(descr->fixup_free,
|
|
(void *) oaddr, state);
|
|
goto repeat;
|
|
default:
|
|
hlist_del(&obj->node);
|
|
__free_object(obj);
|
|
break;
|
|
}
|
|
}
|
|
raw_spin_unlock_irqrestore(&db->lock, flags);
|
|
|
|
if (cnt > debug_objects_maxchain)
|
|
debug_objects_maxchain = cnt;
|
|
|
|
objs_checked += cnt;
|
|
}
|
|
|
|
if (objs_checked > debug_objects_maxchecked)
|
|
debug_objects_maxchecked = objs_checked;
|
|
|
|
/* Schedule work to actually kmem_cache_free() objects */
|
|
if (!READ_ONCE(obj_freeing) && READ_ONCE(obj_nr_tofree)) {
|
|
WRITE_ONCE(obj_freeing, true);
|
|
schedule_delayed_work(&debug_obj_work, ODEBUG_FREE_WORK_DELAY);
|
|
}
|
|
}
|
|
|
|
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)
|
|
{
|
|
int cpu, obj_percpu_free = 0;
|
|
|
|
for_each_possible_cpu(cpu)
|
|
obj_percpu_free += per_cpu(percpu_obj_pool.obj_free, cpu);
|
|
|
|
seq_printf(m, "max_chain :%d\n", debug_objects_maxchain);
|
|
seq_printf(m, "max_checked :%d\n", debug_objects_maxchecked);
|
|
seq_printf(m, "warnings :%d\n", debug_objects_warnings);
|
|
seq_printf(m, "fixups :%d\n", debug_objects_fixups);
|
|
seq_printf(m, "pool_free :%d\n", READ_ONCE(obj_pool_free) + obj_percpu_free);
|
|
seq_printf(m, "pool_pcp_free :%d\n", obj_percpu_free);
|
|
seq_printf(m, "pool_min_free :%d\n", obj_pool_min_free);
|
|
seq_printf(m, "pool_used :%d\n", obj_pool_used - obj_percpu_free);
|
|
seq_printf(m, "pool_max_used :%d\n", obj_pool_max_used);
|
|
seq_printf(m, "on_free_list :%d\n", READ_ONCE(obj_nr_tofree));
|
|
seq_printf(m, "objs_allocated:%d\n", debug_objects_allocated);
|
|
seq_printf(m, "objs_freed :%d\n", debug_objects_freed);
|
|
return 0;
|
|
}
|
|
DEFINE_SHOW_ATTRIBUTE(debug_stats);
|
|
|
|
static int __init debug_objects_init_debugfs(void)
|
|
{
|
|
struct dentry *dbgdir;
|
|
|
|
if (!debug_objects_enabled)
|
|
return 0;
|
|
|
|
dbgdir = debugfs_create_dir("debug_objects", NULL);
|
|
|
|
debugfs_create_file("stats", 0444, dbgdir, NULL, &debug_stats_fops);
|
|
|
|
return 0;
|
|
}
|
|
__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 __initconst const struct debug_obj_descr descr_type_test;
|
|
|
|
static bool __init is_static_object(void *addr)
|
|
{
|
|
struct self_test *obj = addr;
|
|
|
|
return obj->static_init;
|
|
}
|
|
|
|
/*
|
|
* fixup_init is called when:
|
|
* - an active object is initialized
|
|
*/
|
|
static bool __init fixup_init(void *addr, enum debug_obj_state state)
|
|
{
|
|
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);
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* fixup_activate is called when:
|
|
* - an active object is activated
|
|
* - an unknown non-static object is activated
|
|
*/
|
|
static bool __init fixup_activate(void *addr, enum debug_obj_state state)
|
|
{
|
|
struct self_test *obj = addr;
|
|
|
|
switch (state) {
|
|
case ODEBUG_STATE_NOTAVAILABLE:
|
|
return true;
|
|
case ODEBUG_STATE_ACTIVE:
|
|
debug_object_deactivate(obj, &descr_type_test);
|
|
debug_object_activate(obj, &descr_type_test);
|
|
return true;
|
|
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* fixup_destroy is called when:
|
|
* - an active object is destroyed
|
|
*/
|
|
static bool __init fixup_destroy(void *addr, enum debug_obj_state state)
|
|
{
|
|
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);
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* fixup_free is called when:
|
|
* - an active object is freed
|
|
*/
|
|
static bool __init fixup_free(void *addr, enum debug_obj_state state)
|
|
{
|
|
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);
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static int __init
|
|
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);
|
|
|
|
raw_spin_lock_irqsave(&db->lock, flags);
|
|
|
|
obj = lookup_object(addr, db);
|
|
if (!obj && state != ODEBUG_STATE_NONE) {
|
|
WARN(1, KERN_ERR "ODEBUG: selftest object not found\n");
|
|
goto out;
|
|
}
|
|
if (obj && obj->state != state) {
|
|
WARN(1, KERN_ERR "ODEBUG: selftest wrong state: %d != %d\n",
|
|
obj->state, state);
|
|
goto out;
|
|
}
|
|
if (fixups != debug_objects_fixups) {
|
|
WARN(1, KERN_ERR "ODEBUG: selftest fixups failed %d != %d\n",
|
|
fixups, debug_objects_fixups);
|
|
goto out;
|
|
}
|
|
if (warnings != debug_objects_warnings) {
|
|
WARN(1, KERN_ERR "ODEBUG: selftest warnings failed %d != %d\n",
|
|
warnings, debug_objects_warnings);
|
|
goto out;
|
|
}
|
|
res = 0;
|
|
out:
|
|
raw_spin_unlock_irqrestore(&db->lock, flags);
|
|
if (res)
|
|
debug_objects_enabled = 0;
|
|
return res;
|
|
}
|
|
|
|
static __initconst const struct debug_obj_descr descr_type_test = {
|
|
.name = "selftest",
|
|
.is_static_object = is_static_object,
|
|
.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);
|
|
if (check_results(&obj, ODEBUG_STATE_ACTIVE, fixups, warnings))
|
|
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
|
|
pr_info("selftest passed\n");
|
|
|
|
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++)
|
|
raw_spin_lock_init(&obj_hash[i].lock);
|
|
|
|
for (i = 0; i < ODEBUG_POOL_SIZE; i++)
|
|
hlist_add_head(&obj_static_pool[i].node, &obj_pool);
|
|
}
|
|
|
|
/*
|
|
* Convert the statically allocated objects to dynamic ones:
|
|
*/
|
|
static int __init debug_objects_replace_static_objects(void)
|
|
{
|
|
struct debug_bucket *db = obj_hash;
|
|
struct hlist_node *tmp;
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
/* Remove the statically allocated objects from the pool */
|
|
hlist_for_each_entry_safe(obj, tmp, &obj_pool, node)
|
|
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);
|
|
|
|
hlist_for_each_entry(obj, &objects, node) {
|
|
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++;
|
|
}
|
|
}
|
|
|
|
pr_debug("%d of %d active objects replaced\n",
|
|
cnt, obj_pool_used);
|
|
return 0;
|
|
free:
|
|
hlist_for_each_entry_safe(obj, tmp, &objects, node) {
|
|
hlist_del(&obj->node);
|
|
kmem_cache_free(obj_cache, obj);
|
|
}
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
int cpu, extras;
|
|
|
|
if (!debug_objects_enabled)
|
|
return;
|
|
|
|
/*
|
|
* 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));
|
|
|
|
obj_cache = kmem_cache_create("debug_objects_cache",
|
|
sizeof (struct debug_obj), 0,
|
|
SLAB_DEBUG_OBJECTS | SLAB_NOLEAKTRACE,
|
|
NULL);
|
|
|
|
if (!obj_cache || debug_objects_replace_static_objects()) {
|
|
debug_objects_enabled = 0;
|
|
kmem_cache_destroy(obj_cache);
|
|
pr_warn("out of memory.\n");
|
|
} else
|
|
debug_objects_selftest();
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
cpuhp_setup_state_nocalls(CPUHP_DEBUG_OBJ_DEAD, "object:offline", NULL,
|
|
object_cpu_offline);
|
|
#endif
|
|
|
|
/*
|
|
* 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;
|
|
}
|