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latencytop.h
/* SPDX-License-Identifier: GPL-2.0 */ /* * latencytop.h: Infrastructure for displaying latency * * (C) Copyright 2008 Intel Corporation * Author: Arjan van de Ven <arjan@linux.intel.com> * */ #ifndef _INCLUDE_GUARD_LATENCYTOP_H_ #define _INCLUDE_GUARD_LATENCYTOP_H_ #include <linux/compiler.h> struct task_struct; #ifdef CONFIG_LATENCYTOP #define LT_SAVECOUNT 32 #define LT_BACKTRACEDEPTH 12 struct latency_record { unsigned long backtrace[LT_BACKTRACEDEPTH]; unsigned int count; unsigned long time; unsigned long max; }; extern int latencytop_enabled; void __account_scheduler_latency(struct task_struct *task, int usecs, int inter); static inline void account_scheduler_latency(struct task_struct *task, int usecs, int inter) { if (unlikely(latencytop_enabled)) __account_scheduler_latency(task, usecs, inter); } void clear_tsk_latency_tracing(struct task_struct *p); int sysctl_latencytop(struct ctl_table *table, int write, void *buffer, size_t *lenp, loff_t *ppos); #else static inline void account_scheduler_latency(struct task_struct *task, int usecs, int inter) { } static inline void clear_tsk_latency_tracing(struct task_struct *p) { } #endif #endif