linux-kernel - RE: Multiple instances of program sharing same text segment ?

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Message-ID: <FA6FB5FA4DA6BF4386D129273B2E3EC30183A439@xmb-sjc-214.amer.cisco.com>
Date:	Tue, 20 Mar 2007 11:22:45 -0700
From:	"Ravinandan Arakali \(rarakali\)" <rarakali@...co.com>
To:	"Jeremy Fitzhardinge" <jeremy@...p.org>
Cc:	"Linux Kernel" <linux-kernel@...r.kernel.org>
Subject: RE: Multiple instances of program sharing same text segment ?

Thanks Jeremy.

Ravi 

-----Original Message-----
From: Jeremy Fitzhardinge [mailto:jeremy@...p.org] 
Sent: Tuesday, March 20, 2007 11:12 AM
To: Ravinandan Arakali (rarakali)
Cc: Linux Kernel
Subject: Re: Multiple instances of program sharing same text segment ?

Ravinandan Arakali (rarakali) wrote:
> I note that do_exec calls do_mmap to map the executable file to
memory.
> But not sure what happens(w.r.t text sharing) when another instance of

> the program is invoked. BTW, this is 2.6.10.

Yes, they will be shared.  As far as the rest of the kernel is
concerned, an mmap is an mmap is an mmap, and the pages will be shared.

    J
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