linux-kernel - Re: [PATCH 6/7] mm: kill vma flag VM

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Message-ID: <20120402230423.GB32299@count0.beaverton.ibm.com>
Date:	Mon, 2 Apr 2012 16:04:23 -0700
From:	Matt Helsley <matthltc@...ibm.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Konstantin Khlebnikov <khlebnikov@...nvz.org>, linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Eric Paris <eparis@...hat.com>,
	linux-security-module@...r.kernel.org, oprofile-list@...ts.sf.net,
	Matt Helsley <matthltc@...ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Cyrill Gorcunov <gorcunov@...nvz.org>
Subject: Re: [PATCH 6/7] mm: kill vma flag VM_EXECUTABLE

On Sat, Mar 31, 2012 at 10:13:24PM +0200, Oleg Nesterov wrote:
> On 03/31, Konstantin Khlebnikov wrote:
> >
> > comment from v2.6.25-6245-g925d1c4 ("procfs task exe symlink"),
> > where all this stuff was introduced:
> >
> > > ...
> > > This avoids pinning the mounted filesystem.
> >
> > So, this logic is hooked into every file mmap/unmmap and vma split/merge just to
> > fix some hypothetical pinning fs from umounting by mm which already unmapped all
> > its executable files, but still alive. Does anyone know any real world example?
> 
> This is the question to Matt.

This is where I got the scenario:

https://lkml.org/lkml/2007/7/12/398

Cheers,
	-Matt Helsley

PS: I seem to keep coming back to this so I hope folks don't mind if I leave
some more references to make (re)searching this topic easier:

Thread with Cyrill Gorcunov discussing c/r of symlink:
https://lkml.org/lkml/2012/3/16/448

Thread with Oleg Nesterov re: cleanups:
https://lkml.org/lkml/2012/3/5/240

Thread with Alexey Dobriyan re: cleanups:
https://lkml.org/lkml/2009/6/4/625

mainline commit 925d1c401fa6cfd0df5d2e37da8981494ccdec07
Date:   Tue Apr 29 01:01:36 2008 -0700

	procfs task exe symlink

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