Re: [RFC PATCH 00/30] Code tagging framework and applications

[Kent Overstreet]

On Wed, Aug 31, 2022 at 09:38:27AM +0200, Peter Zijlstra wrote:
> On Tue, Aug 30, 2022 at 02:48:49PM -0700, Suren Baghdasaryan wrote:
> > ===========================
> > Code tagging framework
> > ===========================
> > Code tag is a structure identifying a specific location in the source code
> > which is generated at compile time and can be embedded in an application-
> > specific structure. Several applications of code tagging are included in
> > this RFC, such as memory allocation tracking, dynamic fault injection,
> > latency tracking and improved error code reporting.
> > Basically, it takes the old trick of "define a special elf section for
> > objects of a given type so that we can iterate over them at runtime" and
> > creates a proper library for it.
> 
> I might be super dense this morning, but what!? I've skimmed through the
> set and I don't think I get it.
> 
> What does this provide that ftrace/kprobes don't already allow?

You're kidding, right?