linux-kernel - Re: [PATCH] scripts/tracing: fix the bug that can't parse raw_trace

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Date:   Tue, 3 Aug 2021 22:03:40 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Hui Su <suhui@...u.com>
Cc:     me@...enk.de, masahiroy@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scripts/tracing: fix the bug that can't parse
 raw_trace_func

On Fri, 11 Jun 2021 10:21:07 +0800
Hui Su <suhui@...u.com> wrote:

> Since commit 77271ce4b2c0 ("tracing: Add irq, preempt-count and need resched info
> to default trace output"), the default trace output format has been changed to:
>           <idle>-0       [009] d.h. 22420.068695: _raw_spin_lock_irqsave <-hrtimer_interrupt
>           <idle>-0       [000] ..s. 22420.068695: _nohz_idle_balance <-run_rebalance_domains
>           <idle>-0       [011] d.h. 22420.068695: account_process_tick <-update_process_times
> 
> origin trace output format:(before v3.2.0)
>      # tracer: nop
>      #
>      #           TASK-PID    CPU#    TIMESTAMP  FUNCTION
>      #              | |       |          |         |
>           migration/0-6     [000]    50.025810: rcu_note_context_switch <-__schedule
>           migration/0-6     [000]    50.025812: trace_rcu_utilization <-rcu_note_context_switch
>           migration/0-6     [000]    50.025813: rcu_sched_qs <-rcu_note_context_switch
>           migration/0-6     [000]    50.025815: rcu_preempt_qs <-rcu_note_context_switch
>           migration/0-6     [000]    50.025817: trace_rcu_utilization <-rcu_note_context_switch
>           migration/0-6     [000]    50.025818: debug_lockdep_rcu_enabled <-__schedule
>           migration/0-6     [000]    50.025820: debug_lockdep_rcu_enabled <-__schedule
> 
> The draw_functrace.py(introduced in v2.6.28) can't parse the new version format trace_func,
> So we need modify draw_functrace.py to adapt the new version trace output format.
> 
> Signed-off-by: Hui Su <suhui@...u.com>

Hi Hui.

Sorry, I missed this patch. I'll add it to my queue and mark it for
stable.

-- Steve


> ---
>  scripts/tracing/draw_functrace.py | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/scripts/tracing/draw_functrace.py b/scripts/tracing/draw_functrace.py
> index 74f8aadfd4cb..7011fbe003ff 100755
> --- a/scripts/tracing/draw_functrace.py
> +++ b/scripts/tracing/draw_functrace.py
> @@ -17,7 +17,7 @@ Usage:
>  	$ cat /sys/kernel/debug/tracing/trace_pipe > ~/raw_trace_func
>  	Wait some times but not too much, the script is a bit slow.
>  	Break the pipe (Ctrl + Z)
> -	$ scripts/draw_functrace.py < raw_trace_func > draw_functrace
> +	$ scripts/tracing/draw_functrace.py < ~/raw_trace_func > draw_functrace
>  	Then you have your drawn trace in draw_functrace
>  """
>  
> @@ -103,10 +103,10 @@ def parseLine(line):
>  	line = line.strip()
>  	if line.startswith("#"):
>  		raise CommentLineException
> -	m = re.match("[^]]+?\\] +([0-9.]+): (\\w+) <-(\\w+)", line)
> +	m = re.match("[^]]+?\\] +([a-z.]+) +([0-9.]+): (\\w+) <-(\\w+)", line)
>  	if m is None:
>  		raise BrokenLineException
> -	return (m.group(1), m.group(2), m.group(3))
> +	return (m.group(2), m.group(3), m.group(4))
>  
>  
>  def main():