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Subject[PATCH] tracing/fgraph: Missed irq return mark for leaf entry
Date
From: Changbin Du <changbin.du@intel.com>

The fgraph forget to print irq return mark for leaf entry. Then we can see
unbalanced irq mark in the trace. This patch fix this.

Before:
1) | SyS_write() {
1) | __fdget_pos() {
1) 0.061 us | __fget_light();
1) 0.289 us | }
1) | vfs_write() {
1) 0.049 us | rw_verify_area();
1) + 15.424 us | __vfs_write();
1) ==========> |
1) 6.003 us | smp_apic_timer_interrupt();
1) 0.055 us | __fsnotify_parent();
1) 0.073 us | fsnotify();
1) + 23.665 us | }
1) + 24.501 us | }

After:
0) | SyS_write() {
0) | __fdget_pos() {
0) 0.052 us | __fget_light();
0) 0.328 us | }
0) | vfs_write() {
0) 0.057 us | rw_verify_area();
0) | __vfs_write() {
0) ==========> |
0) 8.548 us | smp_apic_timer_interrupt();
0) <========== |
0) + 36.507 us | } /* __vfs_write */
0) 0.049 us | __fsnotify_parent();
0) 0.066 us | fsnotify();
0) + 50.064 us | }
0) + 50.952 us | }

Signed-off-by: Changbin Du <changbin.du@intel.com>
---
kernel/trace/trace_functions_graph.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index 23c0b0c..169b3c4 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -831,6 +831,7 @@ print_graph_entry_leaf(struct trace_iterator *iter,
struct ftrace_graph_ret *graph_ret;
struct ftrace_graph_ent *call;
unsigned long long duration;
+ int cpu = iter->cpu;
int i;

graph_ret = &ret_entry->ret;
@@ -839,7 +840,6 @@ print_graph_entry_leaf(struct trace_iterator *iter,

if (data) {
struct fgraph_cpu_data *cpu_data;
- int cpu = iter->cpu;

cpu_data = per_cpu_ptr(data->cpu_data, cpu);

@@ -869,6 +869,9 @@ print_graph_entry_leaf(struct trace_iterator *iter,

trace_seq_printf(s, "%ps();\n", (void *)call->func);

+ print_graph_irq(iter, graph_ret->func, TRACE_GRAPH_RET,
+ cpu, iter->ent->pid, flags);
+
return trace_handle_return(s);
}

--
2.7.4
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