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Date: Tue, 9 Mar 2010 16:15:16 +0100
From: Jiri Olsa <jolsa@...hat.com>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: mingo@...e.hu, fweisbec@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] tracing: adding ftrace events for graph tracer
On Mon, Mar 08, 2010 at 02:29:46PM -0500, Steven Rostedt wrote:
> On Mon, 2010-02-22 at 13:56 +0100, Jiri Olsa wrote:
> > hi,
> >
> > this patch adds ftrace events for graph tracer, so the graph output
> > could be shared within other tracers.
> >
>
> Sorry but NAK to this,
right, I haven't realized this to be a problem,
I'll send new version shortly
wbr,
jirka
>
> What use to be:
>
> 2) + 25.633 us | }
> 3) ! 252.132 us | } /* do_softirq */
> 2) ! 898.211 us | } /* rcu_process_callbacks */
> 2) | /* softirq_exit: vec=9 [action=RCU] */
> 3) 5.534 us | rcu_irq_exit();
> 2) 6.405 us | preempt_schedule();
> 3) 5.221 us | idle_cpu();
> 2) 6.014 us | rcu_bh_qs();
> 3) ! 289.729 us | } /* irq_exit */
> 2) | /* softirq_entry: vec=1 [action=TIMER] */
> 3) ! 860.416 us | } /* smp_apic_timer_interrupt */
> 3) <========== |
> 2) 5.785 us | preempt_schedule();
>
>
> Is now:
>
> gdmgreeter-3382 [002] 119.609346: 2) + 25.633 us | }
> pcscd-2849 [003] 119.609352: 3) ! 252.132 us | } /* do_softirq */
> gdmgreeter-3382 [002] 119.609353: 2) ! 898.211 us | } /* rcu_process_callbacks */
> gdmgreeter-3382 [002] 119.609357: softirq_exit: vec=9 [action=RCU]
> pcscd-2849 [003] 119.609360: 3) 5.534 us | rcu_irq_exit();
> gdmgreeter-3382 [002] 119.609363: 2) 6.405 us | preempt_schedule();
> pcscd-2849 [003] 119.609370: 3) 5.221 us | idle_cpu();
> gdmgreeter-3382 [002] 119.609376: 2) 6.014 us | rcu_bh_qs();
> pcscd-2849 [003] 119.609383: 3) ! 289.729 us | } /* irq_exit */
> gdmgreeter-3382 [002] 119.609387: softirq_entry: vec=1 [action=TIMER]
> pcscd-2849 [003] 119.609389: 3) ! 860.416 us | } /* smp_apic_timer_interrupt */
> 3) <========== |
> gdmgreeter-3382 [002] 119.609393: 2) 5.785 us | preempt_schedule();
>
>
> Keep the function graph output as is. You can still add the event
> callbacks but do not remove the print_line of the function graph tracer.
> That simply breaks what we worked hard to format nicely.
>
> -- Steve
>
>
> >
> > Signed-off-by: Jiri Olsa <jolsa@...hat.com>
> > ---
> > kernel/trace/trace.h | 3 ++-
> > kernel/trace/trace_functions_graph.c | 25 ++++++++++++++++++++++---
> > 2 files changed, 24 insertions(+), 4 deletions(-)
> >
> > diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
> > index b477fce..1feda87 100644
> > --- a/kernel/trace/trace.h
> > +++ b/kernel/trace/trace.h
> > @@ -490,7 +490,8 @@ extern int trace_clock_id;
> >
> > /* Standard output formatting function used for function return traces */
> > #ifdef CONFIG_FUNCTION_GRAPH_TRACER
> > -extern enum print_line_t print_graph_function(struct trace_iterator *iter);
> > +extern enum print_line_t print_graph_function(struct trace_iterator *iter,
> > + int flags);
> > extern enum print_line_t
> > trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
> >
> > diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
> > index 616b135..41cec17 100644
> > --- a/kernel/trace/trace_functions_graph.c
> > +++ b/kernel/trace/trace_functions_graph.c
> > @@ -38,7 +38,7 @@ struct fgraph_data {
> > #define TRACE_GRAPH_PRINT_OVERHEAD 0x4
> > #define TRACE_GRAPH_PRINT_PROC 0x8
> > #define TRACE_GRAPH_PRINT_DURATION 0x10
> > -#define TRACE_GRAPH_PRINT_ABS_TIME 0X20
> > +#define TRACE_GRAPH_PRINT_ABS_TIME 0x20
> >
> > static struct tracer_opt trace_opts[] = {
> > /* Display overruns? (for self-debug purpose) */
> > @@ -985,7 +985,7 @@ print_graph_comment(struct trace_seq *s, struct trace_entry *ent,
> >
> >
> > enum print_line_t
> > -print_graph_function(struct trace_iterator *iter)
> > +print_graph_function(struct trace_iterator *iter, int flags)
> > {
> > struct ftrace_graph_ent_entry *field;
> > struct fgraph_data *data = iter->private;
> > @@ -1143,6 +1143,16 @@ static void graph_trace_close(struct trace_iterator *iter)
> > }
> > }
> >
> > +static struct trace_event graph_trace_entry_event = {
> > + .type = TRACE_GRAPH_ENT,
> > + .trace = print_graph_function,
> > +};
> > +
> > +static struct trace_event graph_trace_ret_event = {
> > + .type = TRACE_GRAPH_RET,
> > + .trace = print_graph_function,
> > +};
> > +
> > static struct tracer graph_trace __read_mostly = {
> > .name = "function_graph",
> > .open = graph_trace_open,
> > @@ -1152,7 +1162,6 @@ static struct tracer graph_trace __read_mostly = {
> > .wait_pipe = poll_wait_pipe,
> > .init = graph_trace_init,
> > .reset = graph_trace_reset,
> > - .print_line = print_graph_function,
> > .print_header = print_graph_headers,
> > .flags = &tracer_flags,
> > #ifdef CONFIG_FTRACE_SELFTEST
> > @@ -1164,6 +1173,16 @@ static __init int init_graph_trace(void)
> > {
> > max_bytes_for_cpu = snprintf(NULL, 0, "%d", nr_cpu_ids - 1);
> >
> > + if (!register_ftrace_event(&graph_trace_entry_event)) {
> > + pr_warning("Warning: could not register graph trace events\n");
> > + return 1;
> > + }
> > +
> > + if (!register_ftrace_event(&graph_trace_ret_event)) {
> > + pr_warning("Warning: could not register graph trace events\n");
> > + return 1;
> > + }
> > +
> > return register_tracer(&graph_trace);
> > }
> >
>
--
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