linux-kernel - Re: [PATCH] kernel/hung_task.c: printk address for hung

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Message-ID: <CAKwPUozgpzr0-rrUhh2UWALyKeAQ=6YUtw6T+-NY7U+Jb3dFZw@mail.gmail.com>
Date:	Thu, 14 Jan 2016 17:33:00 +0800
From:	Kassey <kassey1216@...il.com>
To:	Pan Xinhui <xinhui@...ux.vnet.ibm.com>
Cc:	mingo@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kernel/hung_task.c: printk address for hung_task

Xinhui:
      when I got a  DDR dump, with the task_struct address for this
task, I can see what file this task is accessing, as well as
task_struct member.
      this is very useful and popular on arch where we can generate a
DDR dump when system crash.

BR
Kassey

On Thu, Jan 14, 2016 at 10:45 AM, Pan Xinhui <xinhui@...ux.vnet.ibm.com> wrote:
> hi, Li
>         I have a little confusion. for what you want to know this ptr's value. Can that help you debug or root the cause?
> I'm just wondering :)
>
> thanks
> xinhui
>
> On 2016年01月13日 10:42, Li wrote:
>> From: Kassey Li <kassey1216@...il.com>
>>
>> this is used to check task_struct info when got a dump.
>>
>> Signed-off-by: Kassey Li <kassey1216@...il.com>
>> ---
>>  kernel/hung_task.c | 4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/kernel/hung_task.c b/kernel/hung_task.c
>> index d234022..b5dd7dd 100644
>> --- a/kernel/hung_task.c
>> +++ b/kernel/hung_task.c
>> @@ -108,8 +108,8 @@ static void check_hung_task(struct task_struct *t, unsigned long timeout)
>>        * Ok, the task did not get scheduled for more than 2 minutes,
>>        * complain:
>>        */
>> -     pr_err("INFO: task %s:%d blocked for more than %ld seconds.\n",
>> -             t->comm, t->pid, timeout);
>> +     pr_err("INFO: task %s:%d 0x%p blocked for more than %ld seconds.\n",
>> +             t->comm, t->pid, t, timeout);
>>       pr_err("      %s %s %.*s\n",
>>               print_tainted(), init_utsname()->release,
>>               (int)strcspn(init_utsname()->version, " "),
>>
>



-- 
Best regards
Kassey