81 lines
1.5 KiB
C
81 lines
1.5 KiB
C
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/*
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* trace stack traces
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*
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* Copyright (C) 2007 Steven Rostedt <srostedt@redhat.com>
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* Copyright (C) 2008 Ingo Molnar <mingo@redhat.com>
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*
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*/
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/debugfs.h>
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#include <linux/kallsyms.h>
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#include <linux/uaccess.h>
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#include <linux/marker.h>
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#include <linux/ftrace.h>
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#include "trace.h"
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static struct trace_array *ctx_trace;
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static int __read_mostly tracer_enabled;
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static notrace void stack_reset(struct trace_array *tr)
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{
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int cpu;
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tr->time_start = ftrace_now(tr->cpu);
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for_each_online_cpu(cpu)
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tracing_reset(tr->data[cpu]);
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}
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static notrace void start_stack_trace(struct trace_array *tr)
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{
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stack_reset(tr);
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tracer_enabled = 1;
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}
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static notrace void stop_stack_trace(struct trace_array *tr)
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{
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tracer_enabled = 0;
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}
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static notrace void stack_trace_init(struct trace_array *tr)
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{
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ctx_trace = tr;
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if (tr->ctrl)
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start_stack_trace(tr);
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}
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static notrace void stack_trace_reset(struct trace_array *tr)
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{
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if (tr->ctrl)
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stop_stack_trace(tr);
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}
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static void stack_trace_ctrl_update(struct trace_array *tr)
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{
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/* When starting a new trace, reset the buffers */
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if (tr->ctrl)
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start_stack_trace(tr);
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else
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stop_stack_trace(tr);
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}
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static struct tracer stack_trace __read_mostly =
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{
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.name = "sysprof",
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.init = stack_trace_init,
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.reset = stack_trace_reset,
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.ctrl_update = stack_trace_ctrl_update,
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#ifdef CONFIG_FTRACE_SELFTEST
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.selftest = trace_selftest_startup_stack,
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#endif
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};
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__init static int init_stack_trace(void)
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{
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return register_tracer(&stack_trace);
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}
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device_initcall(init_stack_trace);
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