Re: [PATCH v12 2/3] sched: Move task_mm_cid_work to mm work_struct

[Peter Zijlstra]

On Tue, Mar 11, 2025 at 07:28:45AM +0100, Gabriele Monaco wrote:
> +static inline void rseq_preempt_from_tick(struct task_struct *t)
> +{
> +	u64 rtime = t->se.sum_exec_runtime - t->se.prev_sum_exec_runtime;
> +
> +	if (rtime > RSEQ_UNPREEMPTED_THRESHOLD)
> +		rseq_preempt(t);
> +}

This confused me.

The goal seems to be to tickle __rseq_handle_notify_resume() so it'll
end up queueing that work thing. But why do we want to set PREEMPT_BIT
here?