#include <linux/sched.h>
#include <linux/slab.h>
+#include <linux/jump_label.h>
#ifdef CONFIG_TASK_DELAY_ACCT
+DECLARE_STATIC_KEY_TRUE(delayacct_key);
extern int delayacct_on; /* Delay accounting turned on/off */
extern struct kmem_cache *delayacct_cache;
extern void delayacct_init(void);
static inline void delayacct_blkio_start(void)
{
+ if (!static_branch_likely(&delayacct_key))
+ return;
+
delayacct_set_flag(current, DELAYACCT_PF_BLKIO);
if (current->delays)
__delayacct_blkio_start();
static inline void delayacct_blkio_end(struct task_struct *p)
{
+ if (!static_branch_likely(&delayacct_key))
+ return;
+
if (p->delays)
__delayacct_blkio_end(p);
delayacct_clear_flag(p, DELAYACCT_PF_BLKIO);
#include <linux/delayacct.h>
#include <linux/module.h>
+DEFINE_STATIC_KEY_TRUE(delayacct_key);
int delayacct_on __read_mostly = 1; /* Delay accounting turned on/off */
struct kmem_cache *delayacct_cache;
{
delayacct_cache = KMEM_CACHE(task_delay_info, SLAB_PANIC|SLAB_ACCOUNT);
delayacct_tsk_init(&init_task);
+ if (!delayacct_on)
+ static_branch_disable(&delayacct_key);
}
void __delayacct_tsk_init(struct task_struct *tsk)