mirror of https://gitee.com/openkylin/linux.git
670 lines
16 KiB
C
670 lines
16 KiB
C
/*
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*
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* Function graph tracer.
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* Copyright (c) 2008 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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#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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static struct tracer_opt trace_opts[] = {
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/* Display overruns ? */
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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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{ } /* 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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.opts = trace_opts
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};
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/* pid on the last trace processed */
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static pid_t last_pid[NR_CPUS] = { [0 ... NR_CPUS-1] = -1 };
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static int graph_trace_init(struct trace_array *tr)
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{
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int cpu, ret;
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for_each_online_cpu(cpu)
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tracing_reset(tr, cpu);
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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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int i;
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int ret;
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int len;
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char comm[8];
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int spaces = 0;
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/* sign + log10(MAX_INT) + '\0' */
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char pid_str[11];
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strncpy(comm, trace_find_cmdline(pid), 7);
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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)
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{
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pid_t prev_pid;
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int ret;
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if (last_pid[cpu] != -1 && last_pid[cpu] == pid)
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return TRACE_TYPE_HANDLED;
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prev_pid = last_pid[cpu];
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last_pid[cpu] = pid;
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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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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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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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TRACE_TYPE_PARTIAL_LINE;
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ret = trace_seq_printf(s, " => ");
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if (!ret)
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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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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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TRACE_TYPE_PARTIAL_LINE;
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return ret;
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}
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static bool
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trace_branch_is_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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if (!ring_iter)
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return false;
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event = ring_buffer_iter_peek(ring_iter, NULL);
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if (!event)
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return false;
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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 false;
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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 false;
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return true;
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}
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static enum print_line_t
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print_graph_irq(struct trace_seq *s, 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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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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if (type == TRACE_GRAPH_ENT) {
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ret = trace_seq_printf(s, "==========> | ");
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} else {
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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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if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
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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, "<========== |\n");
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}
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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 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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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, 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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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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/* 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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/* 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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return trace_seq_printf(s, " ");
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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, struct trace_seq *s)
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{
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struct ftrace_graph_ret_entry *ret_entry;
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struct ftrace_graph_ret *graph_ret;
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struct ring_buffer_event *event;
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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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event = ring_buffer_read(iter->buffer_iter[iter->cpu], NULL);
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ret_entry = ring_buffer_event_data(event);
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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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/* Overhead */
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if (tracer_flags.val & TRACE_GRAPH_PRINT_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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}
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/* 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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/* 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");
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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 enum print_line_t
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print_graph_entry_nested(struct ftrace_graph_ent_entry *entry,
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struct trace_seq *s, pid_t pid, int cpu)
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{
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int i;
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int ret;
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struct ftrace_graph_ent *call = &entry->graph_ent;
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/* No overhead */
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if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
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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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/* Interrupt */
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ret = print_graph_irq(s, call->func, TRACE_GRAPH_ENT, cpu, pid);
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if (ret == TRACE_TYPE_UNHANDLED) {
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/* No time */
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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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} else {
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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");
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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 enum print_line_t
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print_graph_entry(struct ftrace_graph_ent_entry *field, struct trace_seq *s,
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struct trace_iterator *iter, int cpu)
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{
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int ret;
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struct trace_entry *ent = iter->ent;
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/* Pid */
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if (verif_pid(s, ent->pid, cpu) == TRACE_TYPE_PARTIAL_LINE)
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return TRACE_TYPE_PARTIAL_LINE;
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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, ent->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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if (trace_branch_is_leaf(iter, field))
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return print_graph_entry_leaf(iter, field, s);
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else
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return print_graph_entry_nested(field, s, iter->ent->pid, cpu);
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}
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static enum print_line_t
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print_graph_return(struct ftrace_graph_ret *trace, struct trace_seq *s,
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struct trace_entry *ent, int cpu)
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{
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int i;
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int ret;
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unsigned long long duration = trace->rettime - trace->calltime;
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/* Pid */
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if (verif_pid(s, ent->pid, cpu) == TRACE_TYPE_PARTIAL_LINE)
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return TRACE_TYPE_PARTIAL_LINE;
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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, ent->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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/* Overhead */
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if (tracer_flags.val & TRACE_GRAPH_PRINT_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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}
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/* 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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/* Closing brace */
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for (i = 0; i < trace->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 = trace_seq_printf(s, "}\n");
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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/* Overrun */
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if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERRUN) {
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ret = trace_seq_printf(s, " (Overruns: %lu)\n",
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trace->overrun);
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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}
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ret = print_graph_irq(s, trace->func, TRACE_GRAPH_RET, cpu, ent->pid);
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if (ret == TRACE_TYPE_PARTIAL_LINE)
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return TRACE_TYPE_PARTIAL_LINE;
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return TRACE_TYPE_HANDLED;
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|
}
|
|
|
|
static enum print_line_t
|
|
print_graph_comment(struct print_entry *trace, struct trace_seq *s,
|
|
struct trace_entry *ent, struct trace_iterator *iter)
|
|
{
|
|
int i;
|
|
int ret;
|
|
|
|
/* Pid */
|
|
if (verif_pid(s, ent->pid, iter->cpu) == TRACE_TYPE_PARTIAL_LINE)
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
|
|
/* Cpu */
|
|
if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU) {
|
|
ret = print_graph_cpu(s, iter->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;
|
|
}
|
|
|
|
/* No overhead */
|
|
if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
|
|
ret = trace_seq_printf(s, " ");
|
|
if (!ret)
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
}
|
|
|
|
/* No time */
|
|
ret = trace_seq_printf(s, " | ");
|
|
if (!ret)
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
|
|
/* Indentation */
|
|
if (trace->depth > 0)
|
|
for (i = 0; i < (trace->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, "/* %s", trace->buf);
|
|
if (!ret)
|
|
return TRACE_TYPE_PARTIAL_LINE;
|
|
|
|
if (ent->flags & TRACE_FLAG_CONT)
|
|
trace_seq_print_cont(s, iter);
|
|
|
|
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_seq *s = &iter->seq;
|
|
struct trace_entry *entry = iter->ent;
|
|
|
|
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,
|
|
iter->cpu);
|
|
}
|
|
case TRACE_GRAPH_RET: {
|
|
struct ftrace_graph_ret_entry *field;
|
|
trace_assign_type(field, entry);
|
|
return print_graph_return(&field->ret, s, entry, iter->cpu);
|
|
}
|
|
case TRACE_PRINT: {
|
|
struct print_entry *field;
|
|
trace_assign_type(field, entry);
|
|
return print_graph_comment(field, s, entry, iter);
|
|
}
|
|
default:
|
|
return TRACE_TYPE_UNHANDLED;
|
|
}
|
|
}
|
|
|
|
static void print_graph_headers(struct seq_file *s)
|
|
{
|
|
/* 1st line */
|
|
seq_printf(s, "# ");
|
|
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_OVERHEAD)
|
|
seq_printf(s, "OVERHEAD/");
|
|
seq_printf(s, "DURATION FUNCTION CALLS\n");
|
|
|
|
/* 2nd line */
|
|
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_OVERHEAD) {
|
|
seq_printf(s, "| ");
|
|
seq_printf(s, "| | | | |\n");
|
|
} else
|
|
seq_printf(s, " | | | | |\n");
|
|
}
|
|
static struct tracer graph_trace __read_mostly = {
|
|
.name = "function_graph",
|
|
.init = graph_trace_init,
|
|
.reset = graph_trace_reset,
|
|
.print_line = print_graph_function,
|
|
.print_header = print_graph_headers,
|
|
.flags = &tracer_flags,
|
|
};
|
|
|
|
static __init int init_graph_trace(void)
|
|
{
|
|
return register_tracer(&graph_trace);
|
|
}
|
|
|
|
device_initcall(init_graph_trace);
|