kernel_stat.h

来自「自己做的交叉编译工具！gcc-3.4.5,glibc-2.3.6在ubuntu8」· C头文件 代码 · 共 52 行

#ifndef _LINUX_KERNEL_STAT_H
#define _LINUX_KERNEL_STAT_H

#include <asm/irq.h>
#include <linux/smp.h>
#include <linux/threads.h>

/*
 * 'kernel_stat.h' contains the definitions needed for doing
 * some kernel statistics (CPU usage, context switches ...),
 * used by rstatd/perfmeter
 */

struct cpu_usage_stat {
	__u64 user;
	__u64 nice;
	__u64 system;
	__u64 softirq;
	__u64 irq;
	__u64 idle;
	__u64 iowait;
};

struct kernel_stat {
	struct cpu_usage_stat	cpustat;
	unsigned int irqs[NR_IRQS];
};

DECLARE_PER_CPU(struct kernel_stat, kstat);

#define kstat_cpu(cpu)	per_cpu(kstat, cpu)
/* Must have preemption disabled for this to be meaningful. */
#define kstat_this_cpu	__get_cpu_var(kstat)

extern unsigned long long nr_context_switches(void);

/*
 * Number of interrupts per specific IRQ source, since bootup
 */
static inline int kstat_irqs(int irq)
{
	int i, sum=0;

	for (i = 0; i < NR_CPUS; i++)
		if (cpu_possible(i))
			sum += kstat_cpu(i).irqs[irq];

	return sum;
}

#endif /* _LINUX_KERNEL_STAT_H */