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Re: used_math not cleared for new processes?

To: Zhang Fuxin <fxzhang@ict.ac.cn>
Subject: Re: used_math not cleared for new processes?
From: Jun Sun <jsun@mvista.com>
Date: Wed, 27 Feb 2002 14:53:07 -0800
Cc: "linux-mips@oss.sgi.com" <linux-mips@oss.sgi.com>
References: <200202020723.g127N4d30447@oss.sgi.com>
Sender: owner-linux-mips@oss.sgi.com
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.4) Gecko/20011126 Netscape6/6.2.1
Zhang Fuxin wrote:

> hi,linux-mips,
>    I find that current->used_math isn't cleared when we start a new 
> process.Is it
> intended? I mean 'start_thread' in do_exec but not 'copy_thread' in do_fork 
> when
> speaking 'start a new process'. We can/should? keep used_math for the 
> latter,but for
> the former?
> 


I think it make sense to clear used_math in do_exec().  It also improvies the
 performance slightly by not loading the parent's FPU context when it uses the
FPU for the first time.

Do you have a patch for this?

Jun


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