linux-kernel - Re: stopping a process during a timer interrupt

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Message-Id: <08F249B5-AED0-42EF-8B61-1B3AFAF1747C@gmail.com>
Date:	Thu, 19 Oct 2006 11:42:31 +0800
From:	Kay Tiong Khoo <kaytiong@...il.com>
To:	Michal Schmidt <xschmi00@...d.feec.vutbr.cz>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: stopping a process during a timer interrupt

That's true. But if you are writing a profiler, the current process  
is the process of interest in the interrupt context.

Kay Tiong

On Oct 18, 2006, at 10:30 PM, Michal Schmidt wrote:

> Kay Tiong Khoo skrev:
>> On a timer interrupt, I tried to stop the current process by changing
>> it's run state to TASK_STOPPED via set_current_state(TASK_STOPPED).
>> However, this results in a system hang.
>> I can't find a way to stop the current process during an interrupt
>> context. Does such code exist in the kernel? If not, how does one go
>> about implementing it from within a kernel module.
>
> In interrupt context there's no "current process" by definition.
>
> Michal

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