linux/kernel/sched/stats.c

// SPDX-License-Identifier: GPL-2.0
/*
 * /proc/schedstat implementation
 */

void __update_stats_wait_start(struct rq *rq, struct task_struct *p,
			       struct sched_statistics *stats)
{ … }

void __update_stats_wait_end(struct rq *rq, struct task_struct *p,
			     struct sched_statistics *stats)
{ … }

void __update_stats_enqueue_sleeper(struct rq *rq, struct task_struct *p,
				    struct sched_statistics *stats)
{ … }

/*
 * Current schedstat API version.
 *
 * 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 …

static int show_schedstat(struct seq_file *seq, void *v)
{ … }

/*
 * This iterator 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)
{ … }

static void *schedstat_next(struct seq_file *file, void *data, loff_t *offset)
{ … }

static void schedstat_stop(struct seq_file *file, void *data)
{ … }

static const struct seq_operations schedstat_sops = …;

static int __init proc_schedstat_init(void)
{ … }
subsys_initcall(proc_schedstat_init);