>
> On 8/25/26 21:33, Zqiang wrote:
>
> >
> > If srcu_barrier() be invoke before srcu_cleanup(), and after srcu_barrier()
> > completion, there are no concurrent srcu grace period start again (e.g.
> > call_srcu() calls),
> > the timer_delete_sync() should return false, the rcu_segcblist_n_cbs()
> > will not be check.
> > Or did I miss something?
> >
> In srcu_gp_end(), delayed work timer is always armed in SRCU_SIZE_SMALL mode
> regardless of whether its cblist has callbacks:
In this SRCU_SIZE_SMALL mode, when queue delayed work timer, the cblist is
always no-empty.
unless invoke start_poll_synchronize_srcu() to begin SRCU garce period,
otherwise invoke call_srcu() or synchronize_srcu*() will insert callback.
Thanks
Zqiang
>
> if (ss_state < SRCU_SIZE_WAIT_BARRIER) {
> srcu_schedule_cbs_sdp(per_cpu_ptr(ssp->sda, get_boot_cpu_id()),
> cbdelay);
> } else {
> ...
> }
>
> and with cbdelay=1 (the non-expedited path) srcu_schedule_cbs_sdp() arms the
> per-CPU delay_work timer for the next jiffy. This includes the srcu_gp_end()
> whose grace period makes the barrier's callbacks ready, so an armed timer is
> left pending when srcu_invoke_callbacks() completes the barrier.
>
> Thanks
> Sunho Park
>
