diff options
Diffstat (limited to 'kernel/include/linux/latencytop.h')
| -rw-r--r-- | kernel/include/linux/latencytop.h | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/kernel/include/linux/latencytop.h b/kernel/include/linux/latencytop.h new file mode 100644 index 000000000..e23121f9d --- /dev/null +++ b/kernel/include/linux/latencytop.h @@ -0,0 +1,53 @@ +/* + * 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_all_latency_tracing(struct task_struct *p); + +#else + +static inline void +account_scheduler_latency(struct task_struct *task, int usecs, int inter) +{ +} + +static inline void clear_all_latency_tracing(struct task_struct *p) +{ +} + +#endif + +#endif |