linux-kernel - Re: how to find a task through name faster?

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Message-ID: <CANudz+skU6AyPAgAJWLsoiY6DKKeYtWr2Ts3NJd_+AiGRXd+SA@mail.gmail.com>
Date:	Wed, 13 Jul 2011 15:55:09 +0800
From:	loody <miloody@...il.com>
To:	Jiri Slaby <jirislaby@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: how to find a task through name faster?

hi:

2011/7/12 Jiri Slaby <jirislaby@...il.com>:
> On 07/11/2011 06:52 PM, loody wrote:
>> hi all:
>> I found a way to find a task I need by name, test,  as below:
>> for_each_process(task) {
>>     if(strcmp(task->comm, "test")
>>         printk(“%s[%d]\n”, task->comm, task->pid);
>> }
>>
>> But it is time-consuming to do so if I periodically want to know
>> whether "test" exist or not.
>> is there better way to do so?
>
> It depends on what you are trying to achieve. Maybe process accounting
> is what you want?
Would you mind to explain what is "process accounting"?
I ask this question cause I need to do something in my kernel driver
when a thread starting running.

is there any rule to assign a pid before starting a thread?
if there is a rule or range, such 100 ~200 for A type, 200~300 for B
type, I can focus on specific type of thread in that range instead of
searching everyone.

-- 
Regards,
--
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