![Steven Rostedt](/assets/img/avatar_default.png)
graph time is the time that a function is executing another function. Thus if function A calls B, if graph-time is set, then the time for A includes B. This is the default behavior. But if graph-time is off, then the time spent executing B is subtracted from A. Signed-off-by: Steven Rostedt <srostedt@redhat.com>
900 lines
21 KiB
C
900 lines
21 KiB
C
/*
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*
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* Function graph tracer.
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* Copyright (c) 2008-2009 Frederic Weisbecker <fweisbec@gmail.com>
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* Mostly borrowed from function tracer which
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* is Copyright (c) Steven Rostedt <srostedt@redhat.com>
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*
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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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#include "trace_output.h"
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struct fgraph_data {
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pid_t last_pid;
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int depth;
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};
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#define TRACE_GRAPH_INDENT 2
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/* Flag options */
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#define TRACE_GRAPH_PRINT_OVERRUN 0x1
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#define TRACE_GRAPH_PRINT_CPU 0x2
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#define TRACE_GRAPH_PRINT_OVERHEAD 0x4
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#define TRACE_GRAPH_PRINT_PROC 0x8
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#define TRACE_GRAPH_PRINT_DURATION 0x10
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#define TRACE_GRAPH_PRINT_ABS_TIME 0X20
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static struct tracer_opt trace_opts[] = {
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/* Display overruns? (for self-debug purpose) */
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{ TRACER_OPT(funcgraph-overrun, TRACE_GRAPH_PRINT_OVERRUN) },
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/* Display CPU ? */
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{ TRACER_OPT(funcgraph-cpu, TRACE_GRAPH_PRINT_CPU) },
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/* Display Overhead ? */
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{ TRACER_OPT(funcgraph-overhead, TRACE_GRAPH_PRINT_OVERHEAD) },
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/* Display proc name/pid */
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{ TRACER_OPT(funcgraph-proc, TRACE_GRAPH_PRINT_PROC) },
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/* Display duration of execution */
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{ TRACER_OPT(funcgraph-duration, TRACE_GRAPH_PRINT_DURATION) },
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/* Display absolute time of an entry */
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{ TRACER_OPT(funcgraph-abstime, TRACE_GRAPH_PRINT_ABS_TIME) },
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{ } /* Empty entry */
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};
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static struct tracer_flags tracer_flags = {
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/* Don't display overruns and proc by default */
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.val = TRACE_GRAPH_PRINT_CPU | TRACE_GRAPH_PRINT_OVERHEAD |
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TRACE_GRAPH_PRINT_DURATION,
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.opts = trace_opts
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};
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/* pid on the last trace processed */
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/* Add a function return address to the trace stack on thread info.*/
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int
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ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth)
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{
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unsigned long long calltime;
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int index;
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if (!current->ret_stack)
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return -EBUSY;
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/* The return trace stack is full */
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if (current->curr_ret_stack == FTRACE_RETFUNC_DEPTH - 1) {
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atomic_inc(¤t->trace_overrun);
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return -EBUSY;
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}
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calltime = trace_clock_local();
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index = ++current->curr_ret_stack;
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barrier();
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current->ret_stack[index].ret = ret;
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current->ret_stack[index].func = func;
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current->ret_stack[index].calltime = calltime;
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current->ret_stack[index].subtime = 0;
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*depth = index;
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return 0;
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}
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/* Retrieve a function return address to the trace stack on thread info.*/
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static void
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ftrace_pop_return_trace(struct ftrace_graph_ret *trace, unsigned long *ret)
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{
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int index;
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index = current->curr_ret_stack;
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if (unlikely(index < 0)) {
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ftrace_graph_stop();
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WARN_ON(1);
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/* Might as well panic, otherwise we have no where to go */
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*ret = (unsigned long)panic;
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return;
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}
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*ret = current->ret_stack[index].ret;
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trace->func = current->ret_stack[index].func;
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trace->calltime = current->ret_stack[index].calltime;
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trace->overrun = atomic_read(¤t->trace_overrun);
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trace->depth = index;
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}
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/*
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* Send the trace to the ring-buffer.
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* @return the original return address.
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*/
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unsigned long ftrace_return_to_handler(void)
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{
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struct ftrace_graph_ret trace;
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unsigned long ret;
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ftrace_pop_return_trace(&trace, &ret);
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trace.rettime = trace_clock_local();
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ftrace_graph_return(&trace);
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barrier();
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current->curr_ret_stack--;
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if (unlikely(!ret)) {
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ftrace_graph_stop();
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WARN_ON(1);
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/* Might as well panic. What else to do? */
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ret = (unsigned long)panic;
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}
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return ret;
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}
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static int graph_trace_init(struct trace_array *tr)
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{
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int ret = register_ftrace_graph(&trace_graph_return,
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&trace_graph_entry);
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if (ret)
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return ret;
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tracing_start_cmdline_record();
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return 0;
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}
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static void graph_trace_reset(struct trace_array *tr)
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{
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tracing_stop_cmdline_record();
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unregister_ftrace_graph();
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}
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static inline int log10_cpu(int nb)
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{
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if (nb / 100)
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return 3;
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if (nb / 10)
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return 2;
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return 1;
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}
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static enum print_line_t
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print_graph_cpu(struct trace_seq *s, int cpu)
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{
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int i;
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int ret;
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int log10_this = log10_cpu(cpu);
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int log10_all = log10_cpu(cpumask_weight(cpu_online_mask));
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/*
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* Start with a space character - to make it stand out
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* to the right a bit when trace output is pasted into
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* email:
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*/
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ret = trace_seq_printf(s, " ");
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/*
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* Tricky - we space the CPU field according to the max
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* number of online CPUs. On a 2-cpu system it would take
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* a maximum of 1 digit - on a 128 cpu system it would
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* take up to 3 digits:
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*/
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for (i = 0; i < log10_all - log10_this; i++) {
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ret = trace_seq_printf(s, " ");
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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}
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ret = trace_seq_printf(s, "%d) ", cpu);
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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return TRACE_TYPE_HANDLED;
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}
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#define TRACE_GRAPH_PROCINFO_LENGTH 14
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static enum print_line_t
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print_graph_proc(struct trace_seq *s, pid_t pid)
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{
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char comm[TASK_COMM_LEN];
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/* sign + log10(MAX_INT) + '\0' */
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char pid_str[11];
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int spaces = 0;
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int ret;
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int len;
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int i;
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trace_find_cmdline(pid, comm);
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comm[7] = '\0';
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sprintf(pid_str, "%d", pid);
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/* 1 stands for the "-" character */
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len = strlen(comm) + strlen(pid_str) + 1;
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if (len < TRACE_GRAPH_PROCINFO_LENGTH)
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spaces = TRACE_GRAPH_PROCINFO_LENGTH - len;
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/* First spaces to align center */
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for (i = 0; i < spaces / 2; i++) {
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ret = trace_seq_printf(s, " ");
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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}
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ret = trace_seq_printf(s, "%s-%s", comm, pid_str);
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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/* Last spaces to align center */
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for (i = 0; i < spaces - (spaces / 2); i++) {
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ret = trace_seq_printf(s, " ");
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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}
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return TRACE_TYPE_HANDLED;
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}
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/* If the pid changed since the last trace, output this event */
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static enum print_line_t
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verif_pid(struct trace_seq *s, pid_t pid, int cpu, struct fgraph_data *data)
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{
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pid_t prev_pid;
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pid_t *last_pid;
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int ret;
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if (!data)
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return TRACE_TYPE_HANDLED;
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last_pid = &(per_cpu_ptr(data, cpu)->last_pid);
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if (*last_pid == pid)
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return TRACE_TYPE_HANDLED;
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prev_pid = *last_pid;
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*last_pid = pid;
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if (prev_pid == -1)
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return TRACE_TYPE_HANDLED;
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/*
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* Context-switch trace line:
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------------------------------------------
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| 1) migration/0--1 => sshd-1755
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------------------------------------------
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*/
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ret = trace_seq_printf(s,
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" ------------------------------------------\n");
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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ret = print_graph_cpu(s, cpu);
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if (ret == TRACE_TYPE_PARTIAL_LINE)
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return TRACE_TYPE_PARTIAL_LINE;
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ret = print_graph_proc(s, prev_pid);
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if (ret == TRACE_TYPE_PARTIAL_LINE)
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return TRACE_TYPE_PARTIAL_LINE;
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ret = trace_seq_printf(s, " => ");
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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ret = print_graph_proc(s, pid);
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if (ret == TRACE_TYPE_PARTIAL_LINE)
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return TRACE_TYPE_PARTIAL_LINE;
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ret = trace_seq_printf(s,
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"\n ------------------------------------------\n\n");
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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return TRACE_TYPE_HANDLED;
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}
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static struct ftrace_graph_ret_entry *
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get_return_for_leaf(struct trace_iterator *iter,
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struct ftrace_graph_ent_entry *curr)
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{
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struct ring_buffer_iter *ring_iter;
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struct ring_buffer_event *event;
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struct ftrace_graph_ret_entry *next;
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ring_iter = iter->buffer_iter[iter->cpu];
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/* First peek to compare current entry and the next one */
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if (ring_iter)
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event = ring_buffer_iter_peek(ring_iter, NULL);
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else {
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/* We need to consume the current entry to see the next one */
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ring_buffer_consume(iter->tr->buffer, iter->cpu, NULL);
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event = ring_buffer_peek(iter->tr->buffer, iter->cpu,
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NULL);
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}
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if (!event)
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return NULL;
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next = ring_buffer_event_data(event);
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if (next->ent.type != TRACE_GRAPH_RET)
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return NULL;
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if (curr->ent.pid != next->ent.pid ||
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curr->graph_ent.func != next->ret.func)
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return NULL;
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/* this is a leaf, now advance the iterator */
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if (ring_iter)
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ring_buffer_read(ring_iter, NULL);
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return next;
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}
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/* Signal a overhead of time execution to the output */
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static int
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print_graph_overhead(unsigned long long duration, struct trace_seq *s)
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{
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/* If duration disappear, we don't need anything */
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if (!(tracer_flags.val & TRACE_GRAPH_PRINT_DURATION))
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return 1;
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/* Non nested entry or return */
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if (duration == -1)
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return trace_seq_printf(s, " ");
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if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
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/* Duration exceeded 100 msecs */
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if (duration > 100000ULL)
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return trace_seq_printf(s, "! ");
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/* Duration exceeded 10 msecs */
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if (duration > 10000ULL)
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return trace_seq_printf(s, "+ ");
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}
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return trace_seq_printf(s, " ");
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}
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static int print_graph_abs_time(u64 t, struct trace_seq *s)
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{
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unsigned long usecs_rem;
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usecs_rem = do_div(t, NSEC_PER_SEC);
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usecs_rem /= 1000;
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return trace_seq_printf(s, "%5lu.%06lu | ",
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(unsigned long)t, usecs_rem);
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}
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static enum print_line_t
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print_graph_irq(struct trace_iterator *iter, unsigned long addr,
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enum trace_type type, int cpu, pid_t pid)
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{
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int ret;
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struct trace_seq *s = &iter->seq;
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if (addr < (unsigned long)__irqentry_text_start ||
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addr >= (unsigned long)__irqentry_text_end)
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return TRACE_TYPE_UNHANDLED;
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/* Absolute time */
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if (tracer_flags.val & TRACE_GRAPH_PRINT_ABS_TIME) {
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ret = print_graph_abs_time(iter->ts, s);
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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}
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/* Cpu */
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if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU) {
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ret = print_graph_cpu(s, cpu);
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if (ret == TRACE_TYPE_PARTIAL_LINE)
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return TRACE_TYPE_PARTIAL_LINE;
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}
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/* Proc */
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if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC) {
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ret = print_graph_proc(s, pid);
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if (ret == TRACE_TYPE_PARTIAL_LINE)
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return TRACE_TYPE_PARTIAL_LINE;
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ret = trace_seq_printf(s, " | ");
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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}
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/* No overhead */
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ret = print_graph_overhead(-1, s);
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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if (type == TRACE_GRAPH_ENT)
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ret = trace_seq_printf(s, "==========>");
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else
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ret = trace_seq_printf(s, "<==========");
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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/* Don't close the duration column if haven't one */
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if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION)
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trace_seq_printf(s, " |");
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ret = trace_seq_printf(s, "\n");
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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return TRACE_TYPE_HANDLED;
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}
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enum print_line_t
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trace_print_graph_duration(unsigned long long duration, struct trace_seq *s)
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{
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unsigned long nsecs_rem = do_div(duration, 1000);
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/* log10(ULONG_MAX) + '\0' */
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char msecs_str[21];
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char nsecs_str[5];
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int ret, len;
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int i;
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sprintf(msecs_str, "%lu", (unsigned long) duration);
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/* Print msecs */
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ret = trace_seq_printf(s, "%s", msecs_str);
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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len = strlen(msecs_str);
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/* Print nsecs (we don't want to exceed 7 numbers) */
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if (len < 7) {
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snprintf(nsecs_str, 8 - len, "%03lu", nsecs_rem);
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ret = trace_seq_printf(s, ".%s", nsecs_str);
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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len += strlen(nsecs_str);
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}
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ret = trace_seq_printf(s, " us ");
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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/* Print remaining spaces to fit the row's width */
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for (i = len; i < 7; i++) {
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ret = trace_seq_printf(s, " ");
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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}
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return TRACE_TYPE_HANDLED;
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}
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static enum print_line_t
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print_graph_duration(unsigned long long duration, struct trace_seq *s)
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{
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int ret;
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ret = trace_print_graph_duration(duration, s);
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if (ret != TRACE_TYPE_HANDLED)
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return ret;
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ret = trace_seq_printf(s, "| ");
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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return TRACE_TYPE_HANDLED;
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}
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/* Case of a leaf function on its call entry */
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static enum print_line_t
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print_graph_entry_leaf(struct trace_iterator *iter,
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struct ftrace_graph_ent_entry *entry,
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struct ftrace_graph_ret_entry *ret_entry, struct trace_seq *s)
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{
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struct fgraph_data *data = iter->private;
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struct ftrace_graph_ret *graph_ret;
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struct ftrace_graph_ent *call;
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unsigned long long duration;
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int ret;
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int i;
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graph_ret = &ret_entry->ret;
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call = &entry->graph_ent;
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duration = graph_ret->rettime - graph_ret->calltime;
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if (data) {
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int cpu = iter->cpu;
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int *depth = &(per_cpu_ptr(data, cpu)->depth);
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/*
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* Comments display at + 1 to depth. Since
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* this is a leaf function, keep the comments
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* equal to this depth.
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*/
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*depth = call->depth - 1;
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}
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/* Overhead */
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ret = print_graph_overhead(duration, s);
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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/* Duration */
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if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION) {
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ret = print_graph_duration(duration, s);
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if (ret == TRACE_TYPE_PARTIAL_LINE)
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return TRACE_TYPE_PARTIAL_LINE;
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}
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/* Function */
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for (i = 0; i < call->depth * TRACE_GRAPH_INDENT; i++) {
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ret = trace_seq_printf(s, " ");
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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}
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ret = seq_print_ip_sym(s, call->func, 0);
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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|
|
ret = trace_seq_printf(s, "();\n");
|
|
if (!ret)
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
|
|
return TRACE_TYPE_HANDLED;
|
|
}
|
|
|
|
static enum print_line_t
|
|
print_graph_entry_nested(struct trace_iterator *iter,
|
|
struct ftrace_graph_ent_entry *entry,
|
|
struct trace_seq *s, int cpu)
|
|
{
|
|
struct ftrace_graph_ent *call = &entry->graph_ent;
|
|
struct fgraph_data *data = iter->private;
|
|
int ret;
|
|
int i;
|
|
|
|
if (data) {
|
|
int cpu = iter->cpu;
|
|
int *depth = &(per_cpu_ptr(data, cpu)->depth);
|
|
|
|
*depth = call->depth;
|
|
}
|
|
|
|
/* No overhead */
|
|
ret = print_graph_overhead(-1, s);
|
|
if (!ret)
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
|
|
/* No time */
|
|
if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION) {
|
|
ret = trace_seq_printf(s, " | ");
|
|
if (!ret)
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
}
|
|
|
|
/* Function */
|
|
for (i = 0; i < call->depth * TRACE_GRAPH_INDENT; i++) {
|
|
ret = trace_seq_printf(s, " ");
|
|
if (!ret)
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
}
|
|
|
|
ret = seq_print_ip_sym(s, call->func, 0);
|
|
if (!ret)
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
|
|
ret = trace_seq_printf(s, "() {\n");
|
|
if (!ret)
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
|
|
/*
|
|
* we already consumed the current entry to check the next one
|
|
* and see if this is a leaf.
|
|
*/
|
|
return TRACE_TYPE_NO_CONSUME;
|
|
}
|
|
|
|
static enum print_line_t
|
|
print_graph_prologue(struct trace_iterator *iter, struct trace_seq *s,
|
|
int type, unsigned long addr)
|
|
{
|
|
struct fgraph_data *data = iter->private;
|
|
struct trace_entry *ent = iter->ent;
|
|
int cpu = iter->cpu;
|
|
int ret;
|
|
|
|
/* Pid */
|
|
if (verif_pid(s, ent->pid, cpu, data) == TRACE_TYPE_PARTIAL_LINE)
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
|
|
if (type) {
|
|
/* Interrupt */
|
|
ret = print_graph_irq(iter, addr, type, cpu, ent->pid);
|
|
if (ret == TRACE_TYPE_PARTIAL_LINE)
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
}
|
|
|
|
/* Absolute time */
|
|
if (tracer_flags.val & TRACE_GRAPH_PRINT_ABS_TIME) {
|
|
ret = print_graph_abs_time(iter->ts, s);
|
|
if (!ret)
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
}
|
|
|
|
/* Cpu */
|
|
if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU) {
|
|
ret = print_graph_cpu(s, cpu);
|
|
if (ret == TRACE_TYPE_PARTIAL_LINE)
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
}
|
|
|
|
/* Proc */
|
|
if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC) {
|
|
ret = print_graph_proc(s, ent->pid);
|
|
if (ret == TRACE_TYPE_PARTIAL_LINE)
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
|
|
ret = trace_seq_printf(s, " | ");
|
|
if (!ret)
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static enum print_line_t
|
|
print_graph_entry(struct ftrace_graph_ent_entry *field, struct trace_seq *s,
|
|
struct trace_iterator *iter)
|
|
{
|
|
int cpu = iter->cpu;
|
|
struct ftrace_graph_ent *call = &field->graph_ent;
|
|
struct ftrace_graph_ret_entry *leaf_ret;
|
|
|
|
if (print_graph_prologue(iter, s, TRACE_GRAPH_ENT, call->func))
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
|
|
leaf_ret = get_return_for_leaf(iter, field);
|
|
if (leaf_ret)
|
|
return print_graph_entry_leaf(iter, field, leaf_ret, s);
|
|
else
|
|
return print_graph_entry_nested(iter, field, s, cpu);
|
|
|
|
}
|
|
|
|
static enum print_line_t
|
|
print_graph_return(struct ftrace_graph_ret *trace, struct trace_seq *s,
|
|
struct trace_entry *ent, struct trace_iterator *iter)
|
|
{
|
|
unsigned long long duration = trace->rettime - trace->calltime;
|
|
struct fgraph_data *data = iter->private;
|
|
pid_t pid = ent->pid;
|
|
int cpu = iter->cpu;
|
|
int ret;
|
|
int i;
|
|
|
|
if (data) {
|
|
int cpu = iter->cpu;
|
|
int *depth = &(per_cpu_ptr(data, cpu)->depth);
|
|
|
|
/*
|
|
* Comments display at + 1 to depth. This is the
|
|
* return from a function, we now want the comments
|
|
* to display at the same level of the bracket.
|
|
*/
|
|
*depth = trace->depth - 1;
|
|
}
|
|
|
|
if (print_graph_prologue(iter, s, 0, 0))
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
|
|
/* Overhead */
|
|
ret = print_graph_overhead(duration, s);
|
|
if (!ret)
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
|
|
/* Duration */
|
|
if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION) {
|
|
ret = print_graph_duration(duration, s);
|
|
if (ret == TRACE_TYPE_PARTIAL_LINE)
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
}
|
|
|
|
/* Closing brace */
|
|
for (i = 0; i < trace->depth * TRACE_GRAPH_INDENT; i++) {
|
|
ret = trace_seq_printf(s, " ");
|
|
if (!ret)
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
}
|
|
|
|
ret = trace_seq_printf(s, "}\n");
|
|
if (!ret)
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
|
|
/* Overrun */
|
|
if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERRUN) {
|
|
ret = trace_seq_printf(s, " (Overruns: %lu)\n",
|
|
trace->overrun);
|
|
if (!ret)
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
}
|
|
|
|
ret = print_graph_irq(iter, trace->func, TRACE_GRAPH_RET, cpu, pid);
|
|
if (ret == TRACE_TYPE_PARTIAL_LINE)
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
|
|
return TRACE_TYPE_HANDLED;
|
|
}
|
|
|
|
static enum print_line_t
|
|
print_graph_comment(struct trace_seq *s, struct trace_entry *ent,
|
|
struct trace_iterator *iter)
|
|
{
|
|
unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK);
|
|
struct fgraph_data *data = iter->private;
|
|
struct trace_event *event;
|
|
int depth = 0;
|
|
int ret;
|
|
int i;
|
|
|
|
if (data)
|
|
depth = per_cpu_ptr(data, iter->cpu)->depth;
|
|
|
|
if (print_graph_prologue(iter, s, 0, 0))
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
|
|
/* No overhead */
|
|
ret = print_graph_overhead(-1, s);
|
|
if (!ret)
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
|
|
/* No time */
|
|
if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION) {
|
|
ret = trace_seq_printf(s, " | ");
|
|
if (!ret)
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
}
|
|
|
|
/* Indentation */
|
|
if (depth > 0)
|
|
for (i = 0; i < (depth + 1) * TRACE_GRAPH_INDENT; i++) {
|
|
ret = trace_seq_printf(s, " ");
|
|
if (!ret)
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
}
|
|
|
|
/* The comment */
|
|
ret = trace_seq_printf(s, "/* ");
|
|
if (!ret)
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
|
|
switch (iter->ent->type) {
|
|
case TRACE_BPRINT:
|
|
ret = trace_print_bprintk_msg_only(iter);
|
|
if (ret != TRACE_TYPE_HANDLED)
|
|
return ret;
|
|
break;
|
|
case TRACE_PRINT:
|
|
ret = trace_print_printk_msg_only(iter);
|
|
if (ret != TRACE_TYPE_HANDLED)
|
|
return ret;
|
|
break;
|
|
default:
|
|
event = ftrace_find_event(ent->type);
|
|
if (!event)
|
|
return TRACE_TYPE_UNHANDLED;
|
|
|
|
ret = event->trace(iter, sym_flags);
|
|
if (ret != TRACE_TYPE_HANDLED)
|
|
return ret;
|
|
}
|
|
|
|
/* Strip ending newline */
|
|
if (s->buffer[s->len - 1] == '\n') {
|
|
s->buffer[s->len - 1] = '\0';
|
|
s->len--;
|
|
}
|
|
|
|
ret = trace_seq_printf(s, " */\n");
|
|
if (!ret)
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
|
|
return TRACE_TYPE_HANDLED;
|
|
}
|
|
|
|
|
|
enum print_line_t
|
|
print_graph_function(struct trace_iterator *iter)
|
|
{
|
|
struct trace_entry *entry = iter->ent;
|
|
struct trace_seq *s = &iter->seq;
|
|
|
|
switch (entry->type) {
|
|
case TRACE_GRAPH_ENT: {
|
|
struct ftrace_graph_ent_entry *field;
|
|
trace_assign_type(field, entry);
|
|
return print_graph_entry(field, s, iter);
|
|
}
|
|
case TRACE_GRAPH_RET: {
|
|
struct ftrace_graph_ret_entry *field;
|
|
trace_assign_type(field, entry);
|
|
return print_graph_return(&field->ret, s, entry, iter);
|
|
}
|
|
default:
|
|
return print_graph_comment(s, entry, iter);
|
|
}
|
|
|
|
return TRACE_TYPE_HANDLED;
|
|
}
|
|
|
|
static void print_graph_headers(struct seq_file *s)
|
|
{
|
|
/* 1st line */
|
|
seq_printf(s, "# ");
|
|
if (tracer_flags.val & TRACE_GRAPH_PRINT_ABS_TIME)
|
|
seq_printf(s, " TIME ");
|
|
if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU)
|
|
seq_printf(s, "CPU");
|
|
if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC)
|
|
seq_printf(s, " TASK/PID ");
|
|
if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION)
|
|
seq_printf(s, " DURATION ");
|
|
seq_printf(s, " FUNCTION CALLS\n");
|
|
|
|
/* 2nd line */
|
|
seq_printf(s, "# ");
|
|
if (tracer_flags.val & TRACE_GRAPH_PRINT_ABS_TIME)
|
|
seq_printf(s, " | ");
|
|
if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU)
|
|
seq_printf(s, "| ");
|
|
if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC)
|
|
seq_printf(s, " | | ");
|
|
if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION)
|
|
seq_printf(s, " | | ");
|
|
seq_printf(s, " | | | |\n");
|
|
}
|
|
|
|
static void graph_trace_open(struct trace_iterator *iter)
|
|
{
|
|
/* pid and depth on the last trace processed */
|
|
struct fgraph_data *data = alloc_percpu(struct fgraph_data);
|
|
int cpu;
|
|
|
|
if (!data)
|
|
pr_warning("function graph tracer: not enough memory\n");
|
|
else
|
|
for_each_possible_cpu(cpu) {
|
|
pid_t *pid = &(per_cpu_ptr(data, cpu)->last_pid);
|
|
int *depth = &(per_cpu_ptr(data, cpu)->depth);
|
|
*pid = -1;
|
|
*depth = 0;
|
|
}
|
|
|
|
iter->private = data;
|
|
}
|
|
|
|
static void graph_trace_close(struct trace_iterator *iter)
|
|
{
|
|
free_percpu(iter->private);
|
|
}
|
|
|
|
static struct tracer graph_trace __read_mostly = {
|
|
.name = "function_graph",
|
|
.open = graph_trace_open,
|
|
.close = graph_trace_close,
|
|
.wait_pipe = poll_wait_pipe,
|
|
.init = graph_trace_init,
|
|
.reset = graph_trace_reset,
|
|
.print_line = print_graph_function,
|
|
.print_header = print_graph_headers,
|
|
.flags = &tracer_flags,
|
|
#ifdef CONFIG_FTRACE_SELFTEST
|
|
.selftest = trace_selftest_startup_function_graph,
|
|
#endif
|
|
};
|
|
|
|
static __init int init_graph_trace(void)
|
|
{
|
|
return register_tracer(&graph_trace);
|
|
}
|
|
|
|
device_initcall(init_graph_trace);
|