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