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ec4eaccef4
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Paul E. McKenney ec4eaccef4 rcu: Make rcu_migrate_callbacks wake GP kthread when needed 
The rcu_migrate_callbacks() function invokes rcu_advance_cbs()
twice, ignoring the return value.  This is OK at pressent because of
failsafe code that does the wakeup when needed.  However, this failsafe
code acquires the root rcu_node structure's lock frequently, while
rcu_migrate_callbacks() does so only once per CPU-offline operation.

This commit therefore makes rcu_migrate_callbacks()
wake up the RCU GP kthread when either call to rcu_advance_cbs()
returns true, thus removing need for the failsafe code.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Tested-by: Nicholas Piggin <npiggin@gmail.com>
2018-05-15 10:29:51 -07:00
..
Kconfig rcu: Drive TASKS_RCU directly off of PREEMPT 2017-08-17 07:26:04 -07:00
Kconfig.debug rcu: Move RCU debug Kconfig options to kernel/rcu 2017-06-08 18:52:44 -07:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
rcu_segcblist.c rcu/segcblist: Include rcupdate.h 2017-10-19 12:13:36 -07:00
rcu_segcblist.h rcu: Remove unused RCU list functions 2017-07-25 13:04:49 -07:00
rcu.h rcu: Create RCU-specific workqueues with rescuers 2018-02-23 15:14:40 -08:00
rcuperf.c torture: Provide more sensible nreader/nwriter defaults for rcuperf 2018-02-20 16:22:01 -08:00
rcutorture.c rcutorture: Record which grace-period primitives are tested 2018-02-20 16:21:58 -08:00
srcutiny.c srcu: Move rcu_scheduler_starting() from Tiny RCU to Tiny SRCU 2017-07-24 16:03:22 -07:00
srcutree.c Merge branches 'fixes.2018.02.23a', 'srcu.2018.02.20a' and 'torture.2018.02.20a' into HEAD 2018-02-23 15:15:41 -08:00
sync.c doc: Fix various RCU docbook comment-header problems 2017-10-19 22:26:11 -04:00
tiny.c srcu: Move rcu_scheduler_starting() from Tiny RCU to Tiny SRCU 2017-07-24 16:03:22 -07:00
tree_exp.h rcu: Create RCU-specific workqueues with rescuers 2018-02-23 15:14:40 -08:00
tree_plugin.h rcu: Make rcu_gp_cleanup() more accurately predict need for new GP 2018-05-15 10:29:28 -07:00
tree.c rcu: Make rcu_migrate_callbacks wake GP kthread when needed 2018-05-15 10:29:51 -07:00
tree.h rcu: Convert ->need_future_gp[] array to boolean 2018-05-15 10:29:46 -07:00
update.c rcu: Export init_rcu_head() and destroy_rcu_head() to GPL modules 2017-12-07 19:51:49 -05:00