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tracing, function_graph: Remove dependency of abstime and duration fields on latency 

The display of absolute time and duration fields is based on the
latency field. This was added during the irqsoff/wakeup tracers
graph support changes.

It's causing confusion in what fields will be displayed for the
function_graph tracer itself. So I'm removing this depency, and
adding absolute time and duration fields to the preemptirqsoff
preemptoff irqsoff wakeup tracers.

With following commands:
	# echo function_graph > ./current_tracer
	# cat trace

This is what it looked like before:
# tracer: function_graph
#
#     TIME        CPU  DURATION                  FUNCTION CALLS
#      |          |     |   |                     |   |   |   |
 0)   0.068 us    |          } /* page_add_file_rmap */
 0)               |          _raw_spin_unlock() {
...

This is what it looks like now:
# tracer: function_graph
#
# CPU  DURATION                  FUNCTION CALLS
# |     |   |                     |   |   |   |
 0)   0.068 us    |                } /* add_preempt_count */
 0)   0.993 us    |              } /* vfsmount_lock_local_lock */
...

For preemptirqsoff preemptoff irqsoff wakeup tracers,
this is what it looked like before:
SNIP
#                       _-----=> irqs-off
#                      / _----=> need-resched
#                     | / _---=> hardirq/softirq
#                     || / _--=> preempt-depth
#                     ||| / _-=> lock-depth
#                     |||| /
# CPU  TASK/PID       |||||  DURATION                  FUNCTION CALLS
# |     |    |        |||||   |   |                     |   |   |   |
 1)    <idle>-0    |  d..1  0.000 us    |  acpi_idle_enter_simple();
...

This is what it looks like now:
SNIP
#
#                                       _-----=> irqs-off
#                                      / _----=> need-resched
#                                     | / _---=> hardirq/softirq
#                                     || / _--=> preempt-depth
#                                     ||| /
#     TIME        CPU  TASK/PID       ||||  DURATION                  FUNCTION CALLS
#      |          |     |    |        ||||   |   |                     |   |   |   |
   19.847735 |   1)    <idle>-0    |  d..1  0.000 us    |  acpi_idle_enter_simple();
...

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/1307113131-10045-2-git-send-email-jolsa@redhat.com
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Jiri Olsa 2011-06-03 16:58:47 +02:00 committed by Steven Rostedt
parent 84c15027a7
commit 321e68b095
3 changed files with 9 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
kernel/trace/trace_functions_graph.c
View File

@ -1207,7 +1207,7 @@ print_graph_comment(struct trace_seq *s, struct trace_entry *ent,
enum print_line_t
__print_graph_function_flags(struct trace_iterator *iter, u32 flags)
print_graph_function_flags(struct trace_iterator *iter, u32 flags)
{
struct ftrace_graph_ent_entry *field;
struct fgraph_data *data = iter->private;
@ -1270,18 +1270,7 @@ __print_graph_function_flags(struct trace_iterator *iter, u32 flags)
static enum print_line_t
print_graph_function(struct trace_iterator *iter)
{
return __print_graph_function_flags(iter, tracer_flags.val);
}
enum print_line_t print_graph_function_flags(struct trace_iterator *iter,
u32 flags)
{
if (trace_flags & TRACE_ITER_LATENCY_FMT)
flags |= TRACE_GRAPH_PRINT_DURATION;
else
flags |= TRACE_GRAPH_PRINT_ABS_TIME;
return __print_graph_function_flags(iter, flags);
return print_graph_function_flags(iter, tracer_flags.val);
}
static enum print_line_t
@ -1364,9 +1353,7 @@ void print_graph_headers_flags(struct seq_file *s, u32 flags)
return;
print_trace_header(s, iter);
flags |= TRACE_GRAPH_PRINT_DURATION;
} else
flags |= TRACE_GRAPH_PRINT_ABS_TIME;
}
__print_graph_headers_flags(s, flags);
}

4
kernel/trace/trace_irqsoff.c
View File

@ -226,7 +226,9 @@ static void irqsoff_trace_close(struct trace_iterator *iter)
}
#define GRAPH_TRACER_FLAGS (TRACE_GRAPH_PRINT_CPU | \
TRACE_GRAPH_PRINT_PROC)
TRACE_GRAPH_PRINT_PROC | \
TRACE_GRAPH_PRINT_ABS_TIME | \
TRACE_GRAPH_PRINT_DURATION)
static enum print_line_t irqsoff_print_line(struct trace_iterator *iter)
{

4
kernel/trace/trace_sched_wakeup.c
View File

@ -227,7 +227,9 @@ static void wakeup_trace_close(struct trace_iterator *iter)
graph_trace_close(iter);
}
#define GRAPH_TRACER_FLAGS (TRACE_GRAPH_PRINT_PROC)
#define GRAPH_TRACER_FLAGS (TRACE_GRAPH_PRINT_PROC | \
TRACE_GRAPH_PRINT_ABS_TIME | \
TRACE_GRAPH_PRINT_DURATION)
static enum print_line_t wakeup_print_line(struct trace_iterator *iter)
{