ad0b0fd554
Andrew had some suggestions for the latencytop file; this patch takes care of most of these: * Add documentation * Turn account_scheduler_latency into an inline function * Don't report negative values to userspace * Make the file operations struct const * Fix a few checkpatch.pl warnings Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
53 lines
1 KiB
C
53 lines
1 KiB
C
/*
|
|
* 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>
|
|
#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;
|
|
};
|
|
|
|
|
|
struct task_struct;
|
|
|
|
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
|