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Date: Fri, 2 May 2014 17:08:51 -0400
From: Dave Jones <davej@redhat.com>
To: Mark Brown <broonie@kernel.org>
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Cc: Sarah Sharp <sarah@minilop.net>,
	"ksummit-discuss@lists.linuxfoundation.org"
	<ksummit-discuss@lists.linuxfoundation.org>,
	Greg KH <gregkh@linuxfoundation.org>, Julia Lawall <julia.lawall@lip6.fr>,
	Darren Hart <darren@dvhart.com>, Dan Carpenter <dan.carpenter@oracle.com>
Subject: Re: [Ksummit-discuss] [CORE TOPIC] Kernel tinification: shrinking
 the kernel and avoiding size regressions
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On Fri, May 02, 2014 at 02:03:40PM -0700, Mark Brown wrote:
 > On Fri, May 02, 2014 at 07:45:44PM +0000, Luck, Tony wrote:
 > 
 > > > It would be useful for the smaller build case to have a way of auditing
 > > > which syscalls are actually in use on a system so you can then go
 > > > through and construct a minimal config.
 > 
 > > "strace -c" ?
 > 
 > That works for specific processes but I don't immediately see a
 > straightforward way to do it system wide (I guess a wrapper that straces
 > init and children might do the trick but it's not particularly nice).
 > Part of the trick for getting the general security win is to lower the
 > barrier to entry.`

Sounds like something you could use tracepoints for maybe ?
Failing that, kprobes ?

I'm pretty sure I've seen systemtap examples of this very thing years
ago, but who knows if they even work any more.

	Dave