linux-kernel - Re: [PATCH 3/5] v2 seccomp_filters: Enable ftrace-based system call filtering

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Date:	Thu, 26 May 2011 10:37:12 -0400
From:	Colin Walters <walters@...bum.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Kees Cook <kees.cook@...onical.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Will Drewry <wad@...omium.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/5] v2 seccomp_filters: Enable ftrace-based system call filtering

On Wed, May 25, 2011 at 4:01 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> As to your example of apache modules - last I saw, most of those were
> written in high-level scripting languages that almost invariably end
> up using quite a bit of the system call interfaces. And more
> importantly, almost nobody does unportable code.

Well, there's a difference between frameworks and applications.  At
least in GNOME e.g. we've been generally good at picking up and
transparently taking advantage of Linux-specific stuff where possible
like splice() in g_file_copy(), and in this cycle I'll probably end up
using signalfd() to fix a long standing race condition.

> So hey, I'm willing to be convinced. But I'll need more than people
> _saying_ that they'd be interested. Because judging by past
> performance, nobody ever uses esoteric cool new features.

I'm curious which features you feel are esoteric and cool but unused?
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