Re: [PATCH v3 00/10] x86: ORC unwinder (previously undwarf)

From: Ingo Molnar
Date: Fri Jul 14 2017 - 04:29:13 EST

* Josh Poimboeuf <jpoimboe@xxxxxxxxxx> wrote:

> For user space stack unwinding, the kernel could emulate what the kernel
> 'guess' unwinder does by scanning the user space stack and returning all
> the text addresses it finds.

User-space stacks tend to be much larger than kernel stacks, the cost of doing
such a full scan on every PMI would kill a lot of profiling workloads.