linux-kernel - Re: [PATCH] sched/debug: fix trival print task format

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Date:   Fri, 13 Dec 2019 14:03:47 +0800
From:   Xie XiuQi <xiexiuqi@...wei.com>
To:     Steven Rostedt <rostedt@...dmis.org>
CC:     <peterz@...radead.org>, <mingo@...hat.com>,
        <juri.lelli@...hat.com>, <vincent.guittot@...aro.org>,
        <dietmar.eggemann@....com>, <bsegall@...gle.com>,
        <mgorman@...e.de>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sched/debug: fix trival print task format

Hi,

On 2019/12/12 22:37, Steven Rostedt wrote:
> On Thu, 12 Dec 2019 20:22:44 +0800
> Xie XiuQi <xiexiuqi@...wei.com> wrote:
> 
>> Ensure levave a whitespace between state and task name.
> 
> "levave"?

Sorry for the typo.

> 
>>
>> w/o patch:
>> runnable tasks:
>>  S           task   PID         tree-key  switches  prio     wait
>> -----------------------------------------------------------------
>>  I    kworker/0:2   656     87693.884557      8255   120
>>  Sirq/10-ACPI:Ged   829         0.000000         3    49
>>  Sirq/11-ACPI:Ged   830         0.000000         3    49
>>  Sirq/50-arm-smmu   945         0.000000         3    49
>>
>> with patch:
>> runnable tasks:
>>  S            task   PID         tree-key  switches  prio     wait
>> ------------------------------------------------------------------
>>  I     kworker/0:2   656     87693.884557      8255   120
>>  S irq/10-ACPI:Ged   829         0.000000         3    49
>>  S irq/11-ACPI:Ged   830         0.000000         3    49
>>  S irq/50-arm-smmu   945         0.000000         3    49
>>
>> Signed-off-by: Xie XiuQi <xiexiuqi@...wei.com>
>> ---
>>  kernel/sched/debug.c | 8 ++++----
>>  1 file changed, 4 insertions(+), 4 deletions(-)
>>
>> diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
>> index f7e4579e746c..a1b5a4c1213e 100644
>> --- a/kernel/sched/debug.c
>> +++ b/kernel/sched/debug.c
>> @@ -434,9 +434,9 @@ static void
>>  print_task(struct seq_file *m, struct rq *rq, struct task_struct *p)
>>  {
>>  	if (rq->curr == p)
>> -		SEQ_printf(m, ">R");
>> +		SEQ_printf(m, ">R ");
>>  	else
>> -		SEQ_printf(m, " %c", task_state_to_char(p));
>> +		SEQ_printf(m, " %c ", task_state_to_char(p));
>>  
>>  	SEQ_printf(m, "%15s %5d %9Ld.%06ld %9Ld %5d ",
> 
> Wouldn't it be simpler to just add one space to the above?
> 
> 	SEQ_printf(m, " %15s %5d %9Ld.%06ld %9Ld %5d ",
> 
> ?

That true, thanks.

> 
> -- Steve
> 
>>  		p->comm, task_pid_nr(p),
>> @@ -465,10 +465,10 @@ static void print_rq(struct seq_file *m, struct rq *rq, int rq_cpu)
>>  
>>  	SEQ_printf(m, "\n");
>>  	SEQ_printf(m, "runnable tasks:\n");
>> -	SEQ_printf(m, " S           task   PID         tree-key  switches  prio"
>> +	SEQ_printf(m, " S            task   PID         tree-key  switches  prio"
>>  		   "     wait-time             sum-exec        sum-sleep\n");
>>  	SEQ_printf(m, "-------------------------------------------------------"
>> -		   "----------------------------------------------------\n");
>> +		   "------------------------------------------------------\n");
>>  
>>  	rcu_read_lock();
>>  	for_each_process_thread(g, p) {
> 
> 
> .
>