linux-kernel - Re: looking for a function

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Message-ID: <48D00353.3080203@redhat.com>
Date:	Tue, 16 Sep 2008 15:04:51 -0400
From:	Chris Snook <csnook@...hat.com>
To:	Xu Yang <risingsunxy@...glemail.com>
CC:	Bernd Petrovitsch <bernd@...mix.at>, linux-kernel@...r.kernel.org
Subject: Re: looking for a function

Xu Yang wrote:
> Hi Bernd,
> 
> thanks for you reply.
> 
> yes, I know the thread migrates all the time, this is exactly what I
> would like to observe. I would like to learn about the thread
> migration of some specific scheduling algorithm. so ....
> 
> any idea about the function?
> 
> Best regards,
> 
> Yang

getcpu() should do what you want.

-- Chris

> 2008/9/16, Bernd Petrovitsch <bernd@...mix.at>:
>> Hi!
>>
>> On Tue, 2008-09-16 at 14:50 +0200, Xu Yang wrote:
>>> Hi guys,
>>>
>>> I am looking for a function that can show me the current thread is
>>> running on which cpu.
>>> e.g I am using pthread to write a multithreaded program, in each
>>> thread I would like to insert such kind of function so that I can know
>>> on which cpu this thread is running on.
>> That doesn't make much sense as the same thread can run on a different
>> CPU after each scheduling decision. And - as it is in userspace -
>> scheduling can happen before any assembler op.
>>
>>        Bernd
>> --
>> Firmix Software GmbH                   http://www.firmix.at/
>> mobil: +43 664 4416156                 fax: +43 1 7890849-55
>>          Embedded Linux Development and Services
>>
>>
>>
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