+// SPDX-License-Identifier: GPL-2.0-only
/*
* latencytop.c: Latency display infrastructure
*
* (C) Copyright 2008 Intel Corporation
* Author: Arjan van de Ven <arjan@linux.intel.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; version 2
- * of the License.
*/
/*
#include <linux/sched/stat.h>
#include <linux/list.h>
#include <linux/stacktrace.h>
+#include <linux/sysctl.h>
static DEFINE_RAW_SPINLOCK(latency_lock);
int latencytop_enabled;
+#ifdef CONFIG_SYSCTL
+static int sysctl_latencytop(struct ctl_table *table, int write, void *buffer,
+ size_t *lenp, loff_t *ppos)
+{
+ int err;
+
+ err = proc_dointvec(table, write, buffer, lenp, ppos);
+ if (latencytop_enabled)
+ force_schedstat_enabled();
+
+ return err;
+}
+
+static struct ctl_table latencytop_sysctl[] = {
+ {
+ .procname = "latencytop",
+ .data = &latencytop_enabled,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = sysctl_latencytop,
+ },
+ {}
+};
+#endif
+
void clear_tsk_latency_tracing(struct task_struct *p)
{
unsigned long flags;
account_global_scheduler_latency(struct task_struct *tsk,
struct latency_record *lat)
{
- int firstnonnull = MAXLR + 1;
+ int firstnonnull = MAXLR;
int i;
/* skip kernel threads for now */
}
i = firstnonnull;
- if (i >= MAXLR - 1)
+ if (i >= MAXLR)
return;
/* Allocted a new one: */
return single_open(filp, lstats_show, NULL);
}
-static const struct file_operations lstats_fops = {
- .open = lstats_open,
- .read = seq_read,
- .write = lstats_write,
- .llseek = seq_lseek,
- .release = single_release,
+static const struct proc_ops lstats_proc_ops = {
+ .proc_open = lstats_open,
+ .proc_read = seq_read,
+ .proc_write = lstats_write,
+ .proc_lseek = seq_lseek,
+ .proc_release = single_release,
};
static int __init init_lstats_procfs(void)
{
- proc_create("latency_stats", 0644, NULL, &lstats_fops);
+ proc_create("latency_stats", 0644, NULL, &lstats_proc_ops);
+#ifdef CONFIG_SYSCTL
+ register_sysctl_init("kernel", latencytop_sysctl);
+#endif
return 0;
}
-
-int sysctl_latencytop(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos)
-{
- int err;
-
- err = proc_dointvec(table, write, buffer, lenp, ppos);
- if (latencytop_enabled)
- force_schedstat_enabled();
-
- return err;
-}
device_initcall(init_lstats_procfs);