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Date: Tue, 6 Oct 2015 09:29:08 -0700 From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> To: linux-kernel@...r.kernel.org Cc: mingo@...nel.org, jiangshanlai@...il.com, dipankar@...ibm.com, akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com, josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com, dvhart@...ux.intel.com, fweisbec@...il.com, oleg@...hat.com, bobby.prani@...il.com Subject: [PATCH tip/core/rcu 0/18] Expedited grace-period improvements for 4.4 Hello! This commit continues the effort to reduce the OS jitter from RCU's expedited grace-period primitives, while also loosening the coupling between CPU hotplug and RCU's expedited grace-period primitives: 1. Use rsp->expedited_wq instead of sync_rcu_preempt_exp_wq to enable later code consolidation. 2. Move rcu_report_exp_rnp() to allow later code consolidation. 3. Consolidate combining-tree bitmaks setup for the initialization portion of synchronize_rcu_expedited(). 4. Use single-stage IPI algorithm for preemptible-RCU expedited grace periods. 5. Make synchronize_sched_expedited() use the combining tree to reduce memory contention when waiting for quiescent states. 6. Rename ->qs_pending to ->core_needs_qs to better match this field's use. 7. Invert ->passed_quiesce and rename to ->cpu_no_qs in order to enable later aggregate-OR for requests for normal and expedited grace periods. 8. Make ->cpu_no_qs be a union for aggregate OR. 9. Switch synchronize_sched_expedited() from stop-CPUs to IPI. 10. Stop silencing lockdep false positive for expedited grace periods, given that synchronize_rcu_expedited() no longer invokes synchronize_sched_expedited(), eliminating the apparent deadlock. (Just for the record, there never was a real deadlock.) 11. Stop excluding CPU hotplug in synchronize_sched_expedited(). 12. Remove try_get_online_cpus(), which is now no longer used. 13. Bring sync_sched_exp_select_cpus() into alignment with sync_rcu_exp_select_cpus() as a first step towards consolidating them into one function. 14. Consolidate expedited CPU selection, now that #13 enabled it. 15. Add online/offline information to expedited stall warning message. 16. Dump blocking tasks in expedited stall-warning messages. 17. Enable stall warnings for synchronize_rcu_expedited(). 18. Improve synchronize_sched_expedited() CPU-hotplug handling. Thanx, Paul ------------------------------------------------------------------------ b/Documentation/RCU/trace.txt | 32 +- b/include/linux/cpu.h | 2 b/include/linux/sched.h | 10 b/kernel/cpu.c | 13 b/kernel/rcu/tree.c | 561 ++++++++++++++++++++++++++++++---------- b/kernel/rcu/tree.h | 50 ++- b/kernel/rcu/tree_plugin.h | 579 ++++++++++++++++++++++-------------------- b/kernel/rcu/tree_trace.c | 10 8 files changed, 782 insertions(+), 475 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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