Re: [PATCH v11 00/14] unwind_user: x86: Deferred unwinding infrastructure

[Sam James]

I started to play around with this properly last night and it was
straightforward, fortunately.

Did initially attempt to backport to 6.15 but it was a victim of some
mm refactoring and didn't seem worth to carry on w/ that route.

Started a rough page with notes for myself (but corrections & such
welcome) at https://wiki.gentoo.org/wiki/Project:Toolchain/SFrame but
honestly, it's immediately obvious (and beautiful) when it's working
correctly. I've used Namhyung Kim's example from this thread but you can
see it easily with `perf top -g` too.

In one of the commit messages in the perf series, Steven also gave `perf
record -g -vv true` which was convenient for making sure it's correctly
discovered deferred unwinding support.

I plan on doing measurements next and doing some more playing once I've
built more userland with it.