Commit f8b755ac authored by Frederic Weisbecker's avatar Frederic Weisbecker Committed by Ingo Molnar

tracing/function-graph-tracer: Output arrows signal on hardirq call/return

Impact: make more obvious the hardirq calls in the output

When a hardirq is triggered inside the codeflow on output, we have
now two arrows that indicate the entry and return of the hardirq.

 0)               |          bit_waitqueue() {
 0)   0.880 us    |            __phys_addr();
 0)   2.699 us    |          }
 0)               |          __wake_up_bit() {
 0)   ==========> |          smp_apic_timer_interrupt() {
 0)   0.797 us    |            native_apic_mem_write();
 0)   0.715 us    |            exit_idle();
 0)               |            irq_enter() {
 0)   0.722 us    |              idle_cpu();
 0)   5.519 us    |            }
 0)               |            hrtimer_interrupt() {
 0)               |              ktime_get() {
 0)               |                ktime_get_ts() {
 0)   0.805 us    |                  getnstimeofday();

 [...]

 0) ! 108.528 us  |            }
 0)               |            irq_exit() {
 0)               |              do_softirq() {
 0)               |                __do_softirq() {
 0)   0.895 us    |                  __local_bh_disable();
 0)               |                  run_timer_softirq() {
 0)   0.827 us    |                    hrtimer_run_pending();
 0)   1.226 us    |                    _spin_lock_irq();
 0)               |                    _spin_unlock_irq() {
 0)   6.550 us    |                  }
 0)   0.924 us    |                  _local_bh_enable();
 0) + 12.129 us   |                }
 0) + 13.911 us   |              }
 0)   0.707 us    |              idle_cpu();
 0) + 17.009 us   |            }
 0) ! 137.419 us  |          }
 0)   <========== |
 0)   1.045 us    |          }
 0) ! 148.908 us  |        }
 0) ! 151.022 us  |      }
 0) ! 153.022 us  |    }
 0)   0.963 us    |    journal_mark_dirty();
 0)   0.925 us    |    __brelse();
Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent bcbc4f20
......@@ -231,6 +231,49 @@ trace_branch_is_leaf(struct trace_iterator *iter,
return true;
}
static enum print_line_t
print_graph_irq(struct trace_seq *s, unsigned long addr,
enum trace_type type, int cpu, pid_t pid)
{
int ret;
if (addr < (unsigned long)__irqentry_text_start ||
addr >= (unsigned long)__irqentry_text_end)
return TRACE_TYPE_UNHANDLED;
if (type == TRACE_GRAPH_ENT) {
ret = trace_seq_printf(s, "==========> | ");
} else {
/* 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, 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;
}
ret = trace_seq_printf(s, "<========== |\n");
}
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
return TRACE_TYPE_HANDLED;
}
static enum print_line_t
print_graph_duration(unsigned long long duration, struct trace_seq *s)
......@@ -344,7 +387,7 @@ print_graph_entry_leaf(struct trace_iterator *iter,
static enum print_line_t
print_graph_entry_nested(struct ftrace_graph_ent_entry *entry,
struct trace_seq *s)
struct trace_seq *s, pid_t pid, int cpu)
{
int i;
int ret;
......@@ -357,8 +400,18 @@ print_graph_entry_nested(struct ftrace_graph_ent_entry *entry,
return TRACE_TYPE_PARTIAL_LINE;
}
/* No time */
ret = trace_seq_printf(s, " | ");
/* Interrupt */
ret = print_graph_irq(s, call->func, TRACE_GRAPH_ENT, cpu, pid);
if (ret == TRACE_TYPE_UNHANDLED) {
/* No time */
ret = trace_seq_printf(s, " | ");
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
} else {
if (ret == TRACE_TYPE_PARTIAL_LINE)
return TRACE_TYPE_PARTIAL_LINE;
}
/* Function */
for (i = 0; i < call->depth * TRACE_GRAPH_INDENT; i++) {
......@@ -410,7 +463,7 @@ print_graph_entry(struct ftrace_graph_ent_entry *field, struct trace_seq *s,
if (trace_branch_is_leaf(iter, field))
return print_graph_entry_leaf(iter, field, s);
else
return print_graph_entry_nested(field, s);
return print_graph_entry_nested(field, s, iter->ent->pid, cpu);
}
......@@ -474,6 +527,11 @@ print_graph_return(struct ftrace_graph_ret *trace, struct trace_seq *s,
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
}
ret = print_graph_irq(s, trace->func, TRACE_GRAPH_RET, cpu, ent->pid);
if (ret == TRACE_TYPE_PARTIAL_LINE)
return TRACE_TYPE_PARTIAL_LINE;
return TRACE_TYPE_HANDLED;
}
......
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