26bc83f4cb
This is more of a clean up. Currently the function tracer initializes the tracer with which ever CPU was last used for tracing. This value isn't realy useful for function tracing, but at least it should be something other than a random number. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Cc: Steven Rostedt <srostedt@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
82 lines
1.6 KiB
C
82 lines
1.6 KiB
C
/*
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* ring buffer based function tracer
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*
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* Copyright (C) 2007-2008 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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* Based on code from the latency_tracer, that is:
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*
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* Copyright (C) 2004-2006 Ingo Molnar
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* Copyright (C) 2004 William Lee Irwin III
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*/
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#include <linux/debugfs.h>
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#include <linux/uaccess.h>
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#include <linux/ftrace.h>
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#include <linux/fs.h>
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#include "trace.h"
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static void function_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 void start_function_trace(struct trace_array *tr)
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{
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tr->cpu = get_cpu();
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function_reset(tr);
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put_cpu();
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tracing_start_cmdline_record();
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tracing_start_function_trace();
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}
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static void stop_function_trace(struct trace_array *tr)
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{
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tracing_stop_function_trace();
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tracing_stop_cmdline_record();
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}
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static void function_trace_init(struct trace_array *tr)
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{
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if (tr->ctrl)
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start_function_trace(tr);
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}
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static void function_trace_reset(struct trace_array *tr)
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{
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if (tr->ctrl)
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stop_function_trace(tr);
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}
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static void function_trace_ctrl_update(struct trace_array *tr)
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{
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if (tr->ctrl)
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start_function_trace(tr);
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else
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stop_function_trace(tr);
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}
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static struct tracer function_trace __read_mostly =
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{
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.name = "ftrace",
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.init = function_trace_init,
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.reset = function_trace_reset,
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.ctrl_update = function_trace_ctrl_update,
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#ifdef CONFIG_FTRACE_SELFTEST
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.selftest = trace_selftest_startup_function,
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#endif
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};
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static __init int init_function_trace(void)
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{
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return register_tracer(&function_trace);
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}
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device_initcall(init_function_trace);
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