lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

ftrace-graph: show latency-format on print_graph_irq()

Browse Source 
On the function_graph tracer, the print_graph_irq() function prints a
trace line with the flag ==========> on an irq handler entry, and the
flag <========== on an irq handler return.

But when the latency-format is enable, it is not printing the
latency-format flags, causing the following error in the trace output:

 0)   ==========> |
 0)  d...              |  smp_apic_timer_interrupt() {

This patch fixes this issue by printing the latency-format flags when
it is enable.

Link: http://lkml.kernel.org/r/7c2e226dac20c940b6242178fab7f0e3c9b5ce58.1415233316.git.bristot@redhat.com

Reviewed-by: Luis Claudio R. Goncalves <lgoncalv@redhat.com>
Signed-off-by: Daniel Bristot de Oliveira <bristot@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Daniel Bristot de Oliveira 2014-11-06 15:25:09 -02:00 committed by Steven Rostedt
parent 1177e43641
commit 678f845ed0
1 changed files with 9 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
kernel/trace/trace_functions_graph.c
View File

@ -699,6 +699,7 @@ print_graph_irq(struct trace_iterator *iter, unsigned long addr,
{
int ret;
struct trace_seq *s = &iter->seq;
struct trace_entry *ent = iter->ent;
if (addr < (unsigned long)__irqentry_text_start ||
addr >= (unsigned long)__irqentry_text_end)
@ -728,6 +729,14 @@ print_graph_irq(struct trace_iterator *iter, unsigned long addr,
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
}
/* Latency format */
if (trace_flags & TRACE_ITER_LATENCY_FMT) {
ret = print_graph_lat_fmt(s, ent);
if (ret == TRACE_TYPE_PARTIAL_LINE)
return TRACE_TYPE_PARTIAL_LINE;
}
}
/* No overhead */