ftrace: add sysprof plugin (f06c3810) · Commits · 戴 / test

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);

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