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

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Message-ID: <20090604213033.GZ9285@us.ibm.com>
Date:	Thu, 4 Jun 2009 14:30:33 -0700
From:	Matt Helsley <matthltc@...ibm.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Matt Helsley <matthltc@...ibm.com>,
	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, Jun 04, 2009 at 08:07:23AM -0700, Linus Torvalds wrote:
> 
> 
> 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.

Not quite. The current code pins it as long as the corresponding VMAs
are mapped -- not for the lifetime of the task.

> 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?

Not common to my knowledge, no.

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

Almost all of the time, yes.

Cheers,
	-Matt Helsley
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