Commit f06c3810 authored by Ingo Molnar's avatar Ingo Molnar Committed by Thomas Gleixner
Browse files

ftrace: add sysprof plugin 



very first baby version.

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 677aa9f7

kernel/trace/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -75,6 +75,14 @@ config PREEMPT_TRACER 
	  enabled. This option and the irqs-off timing option can be

	  used together or separately.)



config SYSPROF_TRACER

	bool "Sysprof Tracer"

	depends on DEBUG_KERNEL

	select TRACING

	help

	  This tracer provides the trace needed by the 'Sysprof' userspace

	  tool.



config SCHED_TRACER

	bool "Scheduling Latency Tracer"

	depends on HAVE_FTRACE

kernel/trace/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ obj-$(CONFIG_FTRACE) += libftrace.o 


obj-$(CONFIG_TRACING) += trace.o

obj-$(CONFIG_CONTEXT_SWITCH_TRACER) += trace_sched_switch.o

obj-$(CONFIG_SYSPROF_TRACER) += trace_sysprof.o

obj-$(CONFIG_FTRACE) += trace_functions.o

obj-$(CONFIG_IRQSOFF_TRACER) += trace_irqsoff.o

obj-$(CONFIG_PREEMPT_TRACER) += trace_irqsoff.o

kernel/trace/trace_sysprof.c

0 → 100644
+80 −0
Original line number Diff line number Diff line 
/*

 * trace stack traces

 *

 * Copyright (C) 2007 Steven Rostedt <srostedt@redhat.com>

 * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com>

 *

 */

#include <linux/module.h>

#include <linux/fs.h>

#include <linux/debugfs.h>

#include <linux/kallsyms.h>

#include <linux/uaccess.h>

#include <linux/marker.h>

#include <linux/ftrace.h>



#include "trace.h"



static struct trace_array	*ctx_trace;

static int __read_mostly	tracer_enabled;



static notrace void stack_reset(struct trace_array *tr)

{

	int cpu;



	tr->time_start = ftrace_now(tr->cpu);



	for_each_online_cpu(cpu)

		tracing_reset(tr->data[cpu]);

}



static notrace void start_stack_trace(struct trace_array *tr)

{

	stack_reset(tr);

	tracer_enabled = 1;

}



static notrace void stop_stack_trace(struct trace_array *tr)

{

	tracer_enabled = 0;

}



static notrace void stack_trace_init(struct trace_array *tr)

{

	ctx_trace = tr;



	if (tr->ctrl)

		start_stack_trace(tr);

}



static notrace void stack_trace_reset(struct trace_array *tr)

{

	if (tr->ctrl)

		stop_stack_trace(tr);

}



static void stack_trace_ctrl_update(struct trace_array *tr)

{

	/* When starting a new trace, reset the buffers */

	if (tr->ctrl)

		start_stack_trace(tr);

	else

		stop_stack_trace(tr);

}



static struct tracer stack_trace __read_mostly =

{

	.name		= "sysprof",

	.init		= stack_trace_init,

	.reset		= stack_trace_reset,

	.ctrl_update	= stack_trace_ctrl_update,

#ifdef CONFIG_FTRACE_SELFTEST

	.selftest    = trace_selftest_startup_stack,

#endif

};



__init static int init_stack_trace(void)

{

	return register_tracer(&stack_trace);

}

device_initcall(init_stack_trace);