linux_dsm_epyc7002/kernel/rcu
Paul E. McKenney 6a949b7af8 rcu: Force on tick when invoking lots of callbacks
Callback invocation can run for a significant time period, and within
CONFIG_NO_HZ_FULL=y kernels, this period will be devoid of scheduler-clock
interrupts.  In-kernel execution without such interrupts can cause all
manner of malfunction, with RCU CPU stall warnings being but one result.

This commit therefore forces scheduling-clock interrupts on whenever more
than a few RCU callbacks are invoked.  Because offloaded callback invocation
can be preempted, this forcing is withdrawn on each context switch.  This
in turn requires that the loop invoking RCU callbacks reiterate the forcing
periodically.

[ paulmck: Apply Joel Fernandes TICK_DEP_MASK_RCU->TICK_DEP_BIT_RCU fix. ]
[ paulmck: Remove NO_HZ_FULL check per Frederic Weisbecker feedback. ]
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
2019-10-05 10:46:04 -07:00
..
Kconfig rcu: Use CONFIG_PREEMPTION 2019-07-31 19:03:35 +02:00
Kconfig.debug rcu: Add support for consolidated-RCU reader checking 2019-08-09 11:00:35 -07:00
Makefile
rcu_segcblist.c rcu/nocb: Add bypass callback queueing 2019-08-13 14:37:32 -07:00
rcu_segcblist.h rcu/nocb: Add bypass callback queueing 2019-08-13 14:37:32 -07:00
rcu.h rcu: Add kernel parameter to dump trace after RCU CPU stall warning 2019-08-01 14:05:51 -07:00
rcuperf.c rcuperf: Make rcuperf kernel test more robust for !expedited mode 2019-08-01 14:30:22 -07:00
rcutorture.c rcu/nocb: Print no-CBs diagnostics when rcutorture writer unduly delayed 2019-08-13 14:38:24 -07:00
srcutiny.c
srcutree.c srcu: Avoid srcutorture security-based pointer obfuscation 2019-08-01 14:05:51 -07:00
sync.c rcu/sync: Simplify the state machine 2019-05-28 09:05:23 -07:00
tiny.c
tree_exp.h rcu: Fix spelling mistake "greate"->"great" 2019-08-12 11:25:06 -07:00
tree_plugin.h rcu/nocb: Don't wake no-CBs GP kthread if timer posted under overload 2019-08-13 14:38:24 -07:00
tree_stall.h Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-09-16 17:25:49 -07:00
tree.c rcu: Force on tick when invoking lots of callbacks 2019-10-05 10:46:04 -07:00
tree.h rcu/nocb: Print no-CBs diagnostics when rcutorture writer unduly delayed 2019-08-13 14:38:24 -07:00
update.c Merge branches 'consolidate.2019.08.01b', 'fixes.2019.08.12a', 'lists.2019.08.13a' and 'torture.2019.08.01b' into HEAD 2019-08-13 14:30:30 -07:00