linux-kernel - Re: [PATCH 0/2] utrace

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Date:	Wed, 27 Aug 2008 22:50:54 +0400
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Roland McGrath <roland@...hat.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] utrace

On Wed, Aug 27, 2008 at 02:34:02AM +0400, Alexey Dobriyan wrote:
> On Tue, Aug 26, 2008 at 03:01:02PM -0700, Roland McGrath wrote:
> > utrace is a new kernel-side API for kernel modules, intended to make it
> > tractable to work on novel ways to trace and debug user-mode tasks.
> 
> Finally! Familiar code! :^)
> 
> > A previous utrace prototype was in all Fedora kernels since Fedora Core 6.
> > Some substantial implementation and API details in the current code are
> > different from those past versions.
> 
> And some internal details still horrible and overdesigned just like at
> the very beginning.
> 
> > Please look freshly at these patches.
> 
> Well, all comments on tracehook patches were ignored.
> 
> > This code cannot be enabled without CONFIG_HAVE_ARCH_TRACEHOOK and the arch
> > details it indicates.  In Linus's tree as of v2.6.27-rc4, only powerpc and
> > sparc64 have that support.  The x86 support is available by merging in the
> > tip/x86/tracehook branch.  For working on other arch support, there are some
> > more details at http://sourceware.org/systemtap/wiki/utrace/arch/HowTo and
> > these are mentioned in the comments in arch/Kconfig too (in v2.6.27-rc4).
> > 
> > The first patch adds the utrace kernel API (if CONFIG_UTRACE=y is set).
> > There is no change at all without the config option, and with it there is
> > no effect on anything at all until a kernel module using the utrace API is
> > loaded.  There is detailed documentation on the API in DocBook form.
> > 
> > The second patch adds the CONFIG_UTRACE_PTRACE option.
> 
> If config option for ptrace is fine, please name it CONFIG_PTRACE.
> For one, there will be no second tracing infrastracture. For two, nobody
> but one man on the planet really cares how ptrace(2) is implemented.

Oh, I totally misread what this potion is about.

Of course, it shouldn't exist at all.

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