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sched: latencytop support

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LatencyTOP kernel infrastructure; it measures latencies in the
scheduler and tracks it system wide and per process.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Arjan van de Ven
2008-01-25 21:08:34 +01:00
committed by Ingo Molnar
parent 326587b840
commit 9745512ce7
11 changed files with 429 additions and 1 deletions
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44
include/linux/latencytop.h Normal file
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@@ -0,0 +1,44 @@
/*
* 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_
#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;
void account_scheduler_latency(struct task_struct *task, int usecs, int 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

5
include/linux/sched.h
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@@ -88,6 +88,7 @@ struct sched_param {
#include <linux/hrtimer.h>
#include <linux/task_io_accounting.h>
#include <linux/kobject.h>
#include <linux/latencytop.h>
#include <asm/processor.h>
@@ -1220,6 +1221,10 @@ struct task_struct {
int make_it_fail;
#endif
struct prop_local_single dirties;
#ifdef CONFIG_LATENCYTOP
int latency_record_count;
struct latency_record latency_record[LT_SAVECOUNT];
#endif
};
/*

3
include/linux/stacktrace.h
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@@ -9,10 +9,13 @@ struct stack_trace {
};
extern void save_stack_trace(struct stack_trace *trace);
extern void save_stack_trace_tsk(struct task_struct *tsk,
struct stack_trace *trace);
extern void print_stack_trace(struct stack_trace *trace, int spaces);
#else
# define save_stack_trace(trace) do { } while (0)
# define save_stack_trace_tsk(tsk, trace) do { } while (0)
# define print_stack_trace(trace, spaces) do { } while (0)
#endif