Line data    Source code

       1             : /* SPDX-License-Identifier: GPL-2.0 */
       2             : /*
       3             :  * latencytop.h: Infrastructure for displaying latency
       4             :  *
       5             :  * (C) Copyright 2008 Intel Corporation
       6             :  * Author: Arjan van de Ven <arjan@linux.intel.com>
       7             :  *
       8             :  */
       9             : 
      10             : #ifndef _INCLUDE_GUARD_LATENCYTOP_H_
      11             : #define _INCLUDE_GUARD_LATENCYTOP_H_
      12             : 
      13             : #include <linux/compiler.h>
      14             : struct task_struct;
      15             : 
      16             : #ifdef CONFIG_LATENCYTOP
      17             : 
      18             : #define LT_SAVECOUNT            32
      19             : #define LT_BACKTRACEDEPTH       12
      20             : 
      21             : struct latency_record {
      22             :         unsigned long   backtrace[LT_BACKTRACEDEPTH];
      23             :         unsigned int    count;
      24             :         unsigned long   time;
      25             :         unsigned long   max;
      26             : };
      27             : 
      28             : 
      29             : 
      30             : extern int latencytop_enabled;
      31             : void __account_scheduler_latency(struct task_struct *task, int usecs, int inter);
      32             : static inline void
      33             : account_scheduler_latency(struct task_struct *task, int usecs, int inter)
      34             : {
      35             :         if (unlikely(latencytop_enabled))
      36             :                 __account_scheduler_latency(task, usecs, inter);
      37             : }
      38             : 
      39             : void clear_tsk_latency_tracing(struct task_struct *p);
      40             : 
      41             : int sysctl_latencytop(struct ctl_table *table, int write, void *buffer,
      42             :                 size_t *lenp, loff_t *ppos);
      43             : 
      44             : #else
      45             : 
      46             : static inline void
      47             : account_scheduler_latency(struct task_struct *task, int usecs, int inter)
      48             : {
      49             : }
      50             : 
      51         916 : static inline void clear_tsk_latency_tracing(struct task_struct *p)
      52             : {
      53         916 : }
      54             : 
      55             : #endif
      56             : 
      57             : #endif