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author | Ingo Molnar <mingo@elte.hu> | 2010-12-23 12:57:04 +0100 |
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committer | Ingo Molnar <mingo@elte.hu> | 2010-12-23 12:57:04 +0100 |
commit | 394f4528c523d88daabd50f883a8d6b164075555 (patch) | |
tree | b45a5b87a1ba9be8afe71f1db1537ff19e2b05d8 /init/Kconfig | |
parent | 90a8a73c06cc32b609a880d48449d7083327e11a (diff) | |
parent | 3c2dcf2aed5ea22ecf65a9a871c4963faec421b3 (diff) | |
download | linux-stable-394f4528c523d88daabd50f883a8d6b164075555.tar.gz linux-stable-394f4528c523d88daabd50f883a8d6b164075555.tar.bz2 linux-stable-394f4528c523d88daabd50f883a8d6b164075555.zip |
Merge branch 'rcu/next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-2.6-rcu into core/rcu
Diffstat (limited to 'init/Kconfig')
-rw-r--r-- | init/Kconfig | 55 |
1 files changed, 54 insertions, 1 deletions
diff --git a/init/Kconfig b/init/Kconfig index c9728992a776..526ec1c7456a 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -393,7 +393,6 @@ config PREEMPT_RCU config RCU_TRACE bool "Enable tracing for RCU" - depends on TREE_RCU || TREE_PREEMPT_RCU help This option provides tracing in RCU which presents stats in debugfs for debugging RCU implementation. @@ -459,6 +458,60 @@ config TREE_RCU_TRACE TREE_PREEMPT_RCU implementations, permitting Makefile to trivially select kernel/rcutree_trace.c. +config RCU_BOOST + bool "Enable RCU priority boosting" + depends on RT_MUTEXES && TINY_PREEMPT_RCU + default n + help + This option boosts the priority of preempted RCU readers that + block the current preemptible RCU grace period for too long. + This option also prevents heavy loads from blocking RCU + callback invocation for all flavors of RCU. + + Say Y here if you are working with real-time apps or heavy loads + Say N here if you are unsure. + +config RCU_BOOST_PRIO + int "Real-time priority to boost RCU readers to" + range 1 99 + depends on RCU_BOOST + default 1 + help + This option specifies the real-time priority to which preempted + RCU readers are to be boosted. If you are working with CPU-bound + real-time applications, you should specify a priority higher then + the highest-priority CPU-bound application. + + Specify the real-time priority, or take the default if unsure. + +config RCU_BOOST_DELAY + int "Milliseconds to delay boosting after RCU grace-period start" + range 0 3000 + depends on RCU_BOOST + default 500 + help + This option specifies the time to wait after the beginning of + a given grace period before priority-boosting preempted RCU + readers blocking that grace period. Note that any RCU reader + blocking an expedited RCU grace period is boosted immediately. + + Accept the default if unsure. + +config SRCU_SYNCHRONIZE_DELAY + int "Microseconds to delay before waiting for readers" + range 0 20 + default 10 + help + This option controls how long SRCU delays before entering its + loop waiting on SRCU readers. The purpose of this loop is + to avoid the unconditional context-switch penalty that would + otherwise be incurred if there was an active SRCU reader, + in a manner similar to adaptive locking schemes. This should + be set to be a bit longer than the common-case SRCU read-side + critical-section overhead. + + Accept the default if unsure. + endmenu # "RCU Subsystem" config IKCONFIG |