#include <linux/slab.h>#include <linux/fs.h>#include <linux/seq_file.h>#include <linux/proc_fs.h> #include "sched.h" /* * bump this up when changing the output format or the meaning of an existing * format, so that tools can adapt (or abort) */#define SCHEDSTAT_VERSION 15 static int show_schedstat(struct seq_file *seq, void *v){	int cpu;	int mask_len = DIV_ROUND_UP(NR_CPUS, 32) * 9;	char *mask_str = kmalloc(mask_len, GFP_KERNEL); 	if (mask_str == NULL)		return -ENOMEM; 	if (v == (void *)1) {		seq_printf(seq, "version %d\n", SCHEDSTAT_VERSION);		seq_printf(seq, "timestamp %lu\n", jiffies);	} else {		struct rq *rq;#ifdef CONFIG_SMP		struct sched_domain *sd;		int dcount = 0;#endif		cpu = (unsigned long)(v - 2);		rq = cpu_rq(cpu); 		/* runqueue-specific stats */		seq_printf(seq,		    "cpu%d %u 0 %u %u %u %u %llu %llu %lu",		    cpu, rq->yld_count,		    rq->sched_count, rq->sched_goidle,		    rq->ttwu_count, rq->ttwu_local,		    rq->rq_cpu_time,		    rq->rq_sched_info.run_delay, rq->rq_sched_info.pcount); 		seq_printf(seq, "\n"); #ifdef CONFIG_SMP		/* domain-specific stats */		rcu_read_lock();		for_each_domain(cpu, sd) {			enum cpu_idle_type itype; 			cpumask_scnprintf(mask_str, mask_len,					  sched_domain_span(sd));			seq_printf(seq, "domain%d %s", dcount++, mask_str);			for (itype = CPU_IDLE; itype < CPU_MAX_IDLE_TYPES;					itype++) {				seq_printf(seq, " %u %u %u %u %u %u %u %u",				    sd->lb_count[itype],				    sd->lb_balanced[itype],				    sd->lb_failed[itype],				    sd->lb_imbalance[itype],				    sd->lb_gained[itype],				    sd->lb_hot_gained[itype],				    sd->lb_nobusyq[itype],				    sd->lb_nobusyg[itype]);			}			seq_printf(seq,				   " %u %u %u %u %u %u %u %u %u %u %u %u\n",			    sd->alb_count, sd->alb_failed, sd->alb_pushed,			    sd->sbe_count, sd->sbe_balanced, sd->sbe_pushed,			    sd->sbf_count, sd->sbf_balanced, sd->sbf_pushed,			    sd->ttwu_wake_remote, sd->ttwu_move_affine,			    sd->ttwu_move_balance);		}		rcu_read_unlock();#endif	}	kfree(mask_str);	return 0;} /* * This itererator needs some explanation. * It returns 1 for the header position. * This means 2 is cpu 0. * In a hotplugged system some cpus, including cpu 0, may be missing so we have * to use cpumask_* to iterate over the cpus. */static void *schedstat_start(struct seq_file *file, loff_t *offset){	unsigned long n = *offset; 	if (n == 0)		return (void *) 1; 	n--; 	if (n > 0)		n = cpumask_next(n - 1, cpu_online_mask);	else		n = cpumask_first(cpu_online_mask); 	*offset = n + 1; 	if (n < nr_cpu_ids)		return (void *)(unsigned long)(n + 2);	return NULL;} static void *schedstat_next(struct seq_file *file, void *data, loff_t *offset){	(*offset)++;	return schedstat_start(file, offset);} static void schedstat_stop(struct seq_file *file, void *data){} static const struct seq_operations schedstat_sops = {	.start = schedstat_start,	.next  = schedstat_next,	.stop  = schedstat_stop,	.show  = show_schedstat,}; static int schedstat_open(struct inode *inode, struct file *file){	return seq_open(file, &schedstat_sops);} static const struct file_operations proc_schedstat_operations = {	.open    = schedstat_open,	.read    = seq_read,	.llseek  = seq_lseek,	.release = seq_release,}; static int __init proc_schedstat_init(void){	proc_create("schedstat", 0, NULL, &proc_schedstat_operations);	return 0;}module_init(proc_schedstat_init);