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Paul E. McKenney b0afa0f056 rcu-tasks: Provide boot parameter to delay IPIs until late in grace period 
This commit provides a rcupdate.rcu_task_ipi_delay kernel boot parameter
that specifies how old the RCU tasks trace grace period must be before
the grace-period kthread starts sending IPIs.  This delay allows more
tasks to pass through rcu_tasks_qs() quiescent states, thus reducing
(or even eliminating) the number of IPIs that must be sent.

On a short rcutorture test setting this kernel boot parameter to HZ/2
resulted in zero IPIs for all 877 RCU-tasks trace grace periods that
elapsed during that test.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
2020-04-27 11:03:52 -07:00
..
Kconfig
rcu-tasks: Add an RCU Tasks Trace to simplify protection of tracing hooks
2020-04-27 11:03:51 -07:00
Kconfig.debug
rcutorture: Add torture tests for RCU Tasks Trace
2020-04-27 11:03:51 -07:00
Makefile
rcu: Provide debug symbols and line numbers in KCSAN runs
2020-02-20 15:58:21 -08:00
rcu_segcblist.c
rcu: Remove dead code from rcu_segcblist_insert_pend_cbs()
2020-02-20 15:58:23 -08:00
rcu_segcblist.h
rcu: Remove kfree_rcu() special casing and lazy-callback handling
2020-01-24 10:24:31 -08:00
rcu.h
rcu-tasks: Add RCU tasks to rcutorture writer stall output
2020-04-27 11:03:51 -07:00
rcuperf.c
rcuperf: Measure memory footprint during kfree_rcu() test
2020-02-20 16:03:31 -08:00
rcutorture.c
rcutorture: Add torture tests for RCU Tasks Trace
2020-04-27 11:03:51 -07:00
srcutiny.c
rcu: Use CONFIG_PREEMPTION where appropriate
2019-12-09 12:37:51 -08:00
srcutree.c
Merge branches 'doc.2020.02.27a', 'fixes.2020.03.21a', 'kfree_rcu.2020.02.20a', 'locktorture.2020.02.20a', 'ovld.2020.02.20a', 'rcu-tasks.2020.02.20a', 'srcu.2020.02.20a' and 'torture.2020.02.20a' into HEAD
2020-03-21 17:15:11 -07:00
sync.c
rcu/sync: Simplify the state machine
2019-05-28 09:05:23 -07:00
tasks.h
rcu-tasks: Provide boot parameter to delay IPIs until late in grace period
2020-04-27 11:03:52 -07:00
tiny.c
rcu: Remove kfree_rcu() special casing and lazy-callback handling
2020-01-24 10:24:31 -08:00
tree_exp.h
rcu: Don't use negative nesting depth in __rcu_read_unlock()
2020-04-27 11:03:50 -07:00
tree_plugin.h
rcu-tasks: Make RCU Tasks Trace make use of RCU scheduler hooks
2020-04-27 11:03:52 -07:00
tree_stall.h
rcu-tasks: Add RCU tasks to rcutorture writer stall output
2020-04-27 11:03:51 -07:00
tree.c
rcu: Add comments marking transitions between RCU watching and not
2020-04-27 11:03:50 -07:00
tree.h
rcu: React to callback overload by aggressively seeking quiescent states
2020-02-20 16:00:20 -08:00
update.c
rcu-tasks: Move #ifdef into tasks.h
2020-04-27 11:03:51 -07:00