include/linux/kernel_stat.h

Source file repositories/reference/linux-study-clean/include/linux/kernel_stat.h

File Facts

System
Linux kernel
Corpus path
include/linux/kernel_stat.h
Extension
.h
Size
5852 bytes
Lines
222
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct kernel_cpustat {
#ifdef CONFIG_NO_HZ_COMMON
	bool		idle_dyntick;
	bool		idle_elapse;
	seqcount_t	idle_sleeptime_seq;
	u64		idle_entrytime;
	u64		idle_stealtime[2];
#endif
	u64		cpustat[NR_STATS];
};

struct kernel_stat {
	unsigned long irqs_sum;
	unsigned int softirqs[NR_SOFTIRQS];
};

DECLARE_PER_CPU(struct kernel_stat, kstat);
DECLARE_PER_CPU(struct kernel_cpustat, kernel_cpustat);

/* Must have preemption disabled for this to be meaningful. */
#define kstat_this_cpu this_cpu_ptr(&kstat)
#define kcpustat_this_cpu this_cpu_ptr(&kernel_cpustat)
#define kstat_cpu(cpu) per_cpu(kstat, cpu)
#define kcpustat_cpu(cpu) per_cpu(kernel_cpustat, cpu)

extern unsigned long long nr_context_switches_cpu(int cpu);
extern unsigned long long nr_context_switches(void);

extern unsigned int kstat_irqs_cpu(unsigned int irq, int cpu);
extern void kstat_incr_irq_this_cpu(unsigned int irq);

static inline void kstat_incr_softirqs_this_cpu(unsigned int irq)
{
	__this_cpu_inc(kstat.softirqs[irq]);
}

static inline unsigned int kstat_softirqs_cpu(unsigned int irq, int cpu)
{
       return kstat_cpu(cpu).softirqs[irq];
}

static inline unsigned int kstat_cpu_softirqs_sum(int cpu)
{
	int i;
	unsigned int sum = 0;

	for (i = 0; i < NR_SOFTIRQS; i++)
		sum += kstat_softirqs_cpu(i, cpu);

	return sum;
}

#ifdef CONFIG_GENERIC_IRQ_STAT_SNAPSHOT
extern void kstat_snapshot_irqs(void);
extern unsigned int kstat_get_irq_since_snapshot(unsigned int irq);
#else
static inline void kstat_snapshot_irqs(void) { }
static inline unsigned int kstat_get_irq_since_snapshot(unsigned int irq) { return 0; }
#endif

/*
 * Number of interrupts per specific IRQ source, since bootup
 */
extern unsigned int kstat_irqs_usr(unsigned int irq);

/*
 * Number of interrupts per cpu, since bootup
 */
static inline unsigned long kstat_cpu_irqs_sum(unsigned int cpu)
{
	return kstat_cpu(cpu).irqs_sum;
}

#ifdef CONFIG_NO_HZ_COMMON

#ifdef CONFIG_HAVE_VIRT_CPU_ACCOUNTING_IDLE

static inline void kcpustat_dyntick_start(u64 now) { }
static inline void kcpustat_dyntick_stop(u64 now) { }
static inline void kcpustat_irq_enter(u64 now) { }
static inline void kcpustat_irq_exit(u64 now) { }
static inline bool kcpustat_idle_dyntick(void) { return false; }

extern u64 arch_kcpustat_field_idle(int cpu);
extern u64 arch_kcpustat_field_iowait(int cpu);

static inline u64 kcpustat_field_idle(int cpu)
{
	return arch_kcpustat_field_idle(cpu);
}

Annotation

Implementation Notes