Re: [PATCH v2 5/5] freezer,sched: Rewrite core freezer logic

[Oleg Nesterov]

On 04/21, Eric W. Biederman wrote:
>
> I would like to say that we can do without the wait_task_inactive,
> but it looks like it is necessary to ensure that all of the userspace
> registers are saved where the tracer can get at them.

Yes, for example, fpu regs.

But there are more problems. For example, if debugger changes TIF_BLOCKSTEP
we need to ensure the child is already inactive and it will do another
switch_to() after that.

Oleg.