On 18/02/2020 12:21, Juergen Gross wrote: > Today the RCU handling in Xen is affecting scheduling in several ways. > It is raising sched softirqs without any real need and it requires > tasklets for rcu_barrier(), which interacts badly with core scheduling. > > This small series repairs those issues. > > Additionally some ASSERT()s are added for verification of sane rcu > handling. In order to avoid those triggering right away the obvious > violations are fixed.
I've done more testing of this with [1] and, unfortunately, it quite easily deadlocks while without this series it doesn't. Steps to repro: - apply [1] - take a host with considerable CPU count (~64) - run a loop: xen-hptool smt-disable; xen-hptool smt-enable [1] https://lists.xenproject.org/archives/html/xen-devel/2020-02/msg01383.html Igor _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
