Re: [PATCH v4 4/4] rcu: Support direct wake-up of synchronize_rcu() users

[Uladzislau Rezki]

Hello, Zqiang.

> >
> >         // concurrent sr_normal_gp_cleanup work might observe this update.
> >         smp_store_release(&rcu_state.srs_done_tail, wait_tail);
> >         ASSERT_EXCLUSIVE_WRITER(rcu_state.srs_done_tail);
> >
> > -       if (wait_tail)
> > +       if (wait_tail->next)
> >                 queue_work(system_highpri_wq, &sr_normal_gp_cleanup);
> >
> 
> I'm testing these patches :) , one question is as follows:
> Can we use (WQ_MEM_RECLAIM | WQ_HIGHPR)type of workqueue to perform
> wake-up actions? avoid kworker creation failure under memory pressure, causing
> the wake-up action to be delayed.
> 
I do not have any objections in not doing that, so we can add.

Thank for testing this!

--
Uladzislau Rezki