linux-kernel - Re: [PATCH 1/9] exec_path 1/9: introduce ->exec

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Message-ID: <alpine.LFD.2.01.0906040803410.4880@localhost.localdomain>
Date:	Thu, 4 Jun 2009 08:07:23 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Matt Helsley <matthltc@...ibm.com>
cc:	Alexey Dobriyan <adobriyan@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>, xemul@...allels.com,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, dave@...ux.vnet.ibm.com,
	mingo@...e.hu, linux-fsdevel@...r.kernel.org,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH 1/9] exec_path 1/9: introduce ->exec_path and switch
 /proc/*/exe



On Thu, 4 Jun 2009, Matt Helsley wrote:
> 
> Doesn't this pin the vfs mount of the executable for the lifetime of
> the task?

Well, yes, but so does the current code. 

Sure, in _theory_ it can be a non-mmap executable (maybe people still have 
those old OMAGIC a.out executables), and in _theory_ you could unmap the 
executable even if it was originally mmap'ed, but neither of those is 
exactly common, are they?

So in practice, nothing has changed wrt lifetime of the executable.

			Linus
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