Re: [PATCH v10 06/14] unwind_user/deferred: Add deferred unwinding interface

[Peter Zijlstra]

On Thu, Jun 19, 2025 at 04:56:59AM -0400, Steven Rostedt wrote:

> We have a many to many relationship here where a task_work doesn't work.
> 
> That is, you can have a tracer that expects callbacks from several
> tasks at the same time, as well as some of those tasks expect to send a
> callback to different tracers.
> 
> Later patches add a bitmask to every task that gets set to know which
> trace to use.
> 
> Since the number of tracers that can be called back is fixed to the
> number of bits in long (for the bitmask), I can get rid of the link
> list and make it into an array. That would make this easier.

So something sketching this design decision might be useful. Perhaps a
comment in the file itself?

I feel much of this complication stems from the fact you're wanting to
make this perhaps too generic.