diff options
Diffstat (limited to 'init')
| -rw-r--r-- | init/Kconfig | 19 |
1 files changed, 9 insertions, 10 deletions
diff --git a/init/Kconfig b/init/Kconfig index 6fdd6e33932..ec62139207d 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -494,11 +494,11 @@ config RCU_USER_QS puts RCU in extended quiescent state when the CPU runs in userspace. It means that when a CPU runs in userspace, it is excluded from the global RCU state machine and thus doesn't - to keep the timer tick on for RCU. + try to keep the timer tick on for RCU. Unless you want to hack and help the development of the full - tickless feature, you shouldn't enable this option. It adds - unnecessary overhead. + tickless feature, you shouldn't enable this option. It also + adds unnecessary overhead. If unsure say N @@ -582,14 +582,13 @@ config RCU_FAST_NO_HZ depends on NO_HZ && SMP default n help - This option causes RCU to attempt to accelerate grace periods - in order to allow CPUs to enter dynticks-idle state more - quickly. On the other hand, this option increases the overhead - of the dynticks-idle checking, particularly on systems with - large numbers of CPUs. + This option causes RCU to attempt to accelerate grace periods in + order to allow CPUs to enter dynticks-idle state more quickly. + On the other hand, this option increases the overhead of the + dynticks-idle checking, thus degrading scheduling latency. - Say Y if energy efficiency is critically important, particularly - if you have relatively few CPUs. + Say Y if energy efficiency is critically important, and you don't + care about real-time response. Say N if you are unsure. |