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Date: Mon, 08 Mar 2010 14:29:46 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Jiri Olsa <jolsa@...hat.com>
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, 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,
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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