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debugobjects: Use static key for boot pool selection

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Get rid of the conditional in the hot path.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Zhen Lei <thunder.leizhen@huawei.com>
Link: https://lore.kernel.org/all/20241007164914.077247071@linutronix.de
This commit is contained in:
Thomas Gleixner 2024-10-07 18:50:13 +02:00
parent 9ce99c6d7b
commit 14077b9e58
1 changed files with 11 additions and 8 deletions
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19
lib/debugobjects.c
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@ -7,16 +7,16 @@
#define pr_fmt(fmt) "ODEBUG: " fmt
#include <linux/cpu.h>
#include <linux/debugobjects.h>
#include <linux/interrupt.h>
#include <linux/debugfs.h>
#include <linux/hash.h>
#include <linux/kmemleak.h>
#include <linux/sched.h>
#include <linux/sched/task_stack.h>
#include <linux/seq_file.h>
#include <linux/debugfs.h>
#include <linux/slab.h>
#include <linux/hash.h>
#include <linux/kmemleak.h>
#include <linux/cpu.h>
#include <linux/static_key.h>
#define ODEBUG_HASH_BITS 14
#define ODEBUG_HASH_SIZE (1 << ODEBUG_HASH_BITS)
@ -103,6 +103,8 @@ static int __data_racy debug_objects_freed;
static void free_obj_work(struct work_struct *work);
static DECLARE_DELAYED_WORK(debug_obj_work, free_obj_work);
static DEFINE_STATIC_KEY_FALSE(obj_cache_enabled);
static int __init enable_object_debug(char *str)
{
debug_objects_enabled = true;
@ -343,7 +345,7 @@ static struct debug_obj *alloc_object(void *addr, struct debug_bucket *b,
{
struct debug_obj *obj;
if (likely(obj_cache))
if (static_branch_likely(&obj_cache_enabled))
obj = pcpu_alloc();
else
obj = __alloc_object(&pool_boot);
@ -393,7 +395,7 @@ static void free_obj_work(struct work_struct *work)
static void __free_object(struct debug_obj *obj)
{
guard(irqsave)();
if (likely(obj_cache))
if (static_branch_likely(&obj_cache_enabled))
pcpu_free(obj);
else
hlist_add_head(&obj->node, &pool_boot);
@ -572,7 +574,7 @@ static struct debug_obj *lookup_object_or_alloc(void *addr, struct debug_bucket
static void debug_objects_fill_pool(void)
{
if (unlikely(!obj_cache))
if (!static_branch_likely(&obj_cache_enabled))
return;
if (likely(!pool_should_refill(&pool_global)))
@ -1378,6 +1380,7 @@ void __init debug_objects_mem_init(void)
/* Everything worked. Expose the cache */
obj_cache = cache;
static_branch_enable(&obj_cache_enabled);
#ifdef CONFIG_HOTPLUG_CPU
cpuhp_setup_state_nocalls(CPUHP_DEBUG_OBJ_DEAD, "object:offline", NULL,