endchoice
-config PREEMPT_BKL
- bool "Preempt The Big Kernel Lock"
- depends on SMP || PREEMPT
- default y
+config PREEMPT_RCU
+ bool "Preemptible RCU"
+ depends on PREEMPT
+ default n
help
- This option reduces the latency of the kernel by making the
- big kernel lock preemptible.
+ This option reduces the latency of the kernel by making certain
+ RCU sections preemptible. Normally RCU code is non-preemptible, if
+ this option is selected then read-only RCU sections become
+ preemptible. This helps latency, but may expose bugs due to
+ now-naive assumptions about each RCU read-side critical section
+ remaining on a given CPU through its execution.
- Say Y here if you are building a kernel for a desktop system.
Say N if you are unsure.
config RCU_TRACE
bool "Enable tracing for RCU - currently stats in debugfs"
+ depends on PREEMPT_RCU
select DEBUG_FS
default y
help