linux-kernel - Re: [PATCH 2/2] tasks: Add task

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Date:   Tue, 18 Aug 2020 07:40:40 +0200
From:   Jan Kiszka <jan.kiszka@...mens.com>
To:     Ritesh Harjani <riteshh@...ux.ibm.com>,
        Kieran Bingham <kbingham@...nel.org>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] tasks: Add task_struct addr for lx-ps cmd

On 18.08.20 06:04, Ritesh Harjani wrote:
> task_struct addr in lx-ps cmd seems helpful
> 
> <e.g. o/p>
>       TASK          PID    COMM
> 0xffffffff82c2b8c0   0   swapper/0
> 0xffff888a0ba20040   1   systemd
> 0xffff888a0ba24040   2   kthreadd
> 0xffff888a0ba28040   3   rcu_gp
> 
> Signed-off-by: Ritesh Harjani <riteshh@...ux.ibm.com>
> ---
>  scripts/gdb/linux/tasks.py | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/scripts/gdb/linux/tasks.py b/scripts/gdb/linux/tasks.py
> index 0301dc1e0138..17ec19e9b5bf 100644
> --- a/scripts/gdb/linux/tasks.py
> +++ b/scripts/gdb/linux/tasks.py
> @@ -73,11 +73,12 @@ class LxPs(gdb.Command):
>          super(LxPs, self).__init__("lx-ps", gdb.COMMAND_DATA)
>  
>      def invoke(self, arg, from_tty):
> +        gdb.write("{:>10} {:>12} {:>7}\n".format("TASK", "PID", "COMM"))
>          for task in task_lists():
> -            gdb.write("{address} {pid} {comm}\n".format(
> -                address=task,
> -                pid=task["pid"],
> -                comm=task["comm"].string()))
> +            gdb.write("{} {:^5} {}\n".format(
> +                task.format_string().split()[0],
> +                task["pid"].format_string(),
> +                task["comm"].string()))
>  
>  
>  LxPs()
> 

This patch is confusing me. We already dump the task address. What the
patch changes is adding a header and some conversions of the values. Can
you elaborate?

Jan

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