In multipath-tools, we are using a custom RCU helper thread, which is cleaned out on exit:
https://github.com/opensvc/multipath-tools/blob/23a01fa679481ff1144139222fbd2c4c863b78f8/multipathd/main.c#L3058 I put a call to rcu_barrier() there in order to make sure all callbacks had finished before detaching the helper thread. Now we got a report that rcu_barrier() isn't available before user-space RCU 0.8 (https://github.com/opensvc/multipath-tools/issues/5) (and RHEL7 / Centos7 still has 0.7.16). Question: was it over-cautious or otherwise wrong to call rcu_barrier() before set_thread_call_rcu_data(NULL)? Can we maybe just skip this call? If no, what would be the recommended way for liburcu < 0.8 to dissociate a helper thread? (Note: I'm not currently subscribed to lttng-dev). Regards and thanks, Martin _______________________________________________ lttng-dev mailing list lttng-dev@lists.lttng.org https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
