Messages in this thread | | | Date | Tue, 27 Feb 2024 18:03:35 +0100 | From | Frederic Weisbecker <> | Subject | Re: [PATCH v5 2/4] rcu: Reduce synchronize_rcu() latency |
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Le Tue, Feb 20, 2024 at 07:31:13PM +0100, Uladzislau Rezki (Sony) a écrit : > +/* > + * Helper function for rcu_gp_cleanup(). > + */ > +static void rcu_sr_normal_gp_cleanup(void) > +{ > + struct llist_node *wait_tail; > + > + wait_tail = rcu_state.srs_wait_tail; > + if (wait_tail == NULL) > + return; > + > + rcu_state.srs_wait_tail = NULL; > + ASSERT_EXCLUSIVE_WRITER(rcu_state.srs_wait_tail); > + > + // 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) > + queue_work(system_highpri_wq, &rcu_state.srs_cleanup_work);
You can queue unconditionally here, wait_tail is non-NULL at this point.
Thanks.
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