Re: [PATCH v6 11/18] perf: Use current->flags & PF_KTHREAD instead of current->mm == NULL

Josh Poimboeuf
2025-04-25T15:09:58Z

On Fri, Apr 25, 2025 at 10:54:33AM -0400, Steven Rostedt wrote:
> From: Steven Rostedt <rostedt@goodmis.org>
>
> To determine if a task is a kernel thread or not, it is more reliable to
> use (current->flags & PF_KTHREAD) than to rely on current->mm being NULL.
> That is because some kernel tasks (io_uring helpers) may have a mm field.

There's a current->mm check in the user space unwinder (patch 1) which
should probably also be converted.

--
Josh