| Kconfig (a488985851cf2facd2227bd982cc2c251df56268) | Kconfig (c0f4dfd4f90f1667d234d21f15153ea09a2eaa66) |
|---|---|
| 1config ARCH 2 string 3 option env="ARCH" 4 5config KERNELVERSION 6 string 7 option env="KERNELVERSION" 8 --- 568 unchanged lines hidden (view full) --- 577 578 Say N if unsure. 579 580config RCU_FAST_NO_HZ 581 bool "Accelerate last non-dyntick-idle CPU's grace periods" 582 depends on NO_HZ && SMP 583 default n 584 help | 1config ARCH 2 string 3 option env="ARCH" 4 5config KERNELVERSION 6 string 7 option env="KERNELVERSION" 8 --- 568 unchanged lines hidden (view full) --- 577 578 Say N if unsure. 579 580config RCU_FAST_NO_HZ 581 bool "Accelerate last non-dyntick-idle CPU's grace periods" 582 depends on NO_HZ && SMP 583 default n 584 help |
| 585 This option causes RCU to attempt to accelerate grace periods in 586 order to allow CPUs to enter dynticks-idle state more quickly. 587 On the other hand, this option increases the overhead of the 588 dynticks-idle checking, thus degrading scheduling latency. | 585 This option permits CPUs to enter dynticks-idle state even if 586 they have RCU callbacks queued, and prevents RCU from waking 587 these CPUs up more than roughly once every four jiffies (by 588 default, you can adjust this using the rcutree.rcu_idle_gp_delay 589 parameter), thus improving energy efficiency. On the other 590 hand, this option increases the duration of RCU grace periods, 591 for example, slowing down synchronize_rcu(). |
| 589 | 592 |
| 590 Say Y if energy efficiency is critically important, and you don't 591 care about real-time response. | 593 Say Y if energy efficiency is critically important, and you 594 don't care about increased grace-period durations. |
| 592 593 Say N if you are unsure. 594 595config TREE_RCU_TRACE 596 def_bool RCU_TRACE && ( TREE_RCU || TREE_PREEMPT_RCU ) 597 select DEBUG_FS 598 help 599 This option provides tracing for the TREE_RCU and --- 1209 unchanged lines hidden --- | 595 596 Say N if you are unsure. 597 598config TREE_RCU_TRACE 599 def_bool RCU_TRACE && ( TREE_RCU || TREE_PREEMPT_RCU ) 600 select DEBUG_FS 601 help 602 This option provides tracing for the TREE_RCU and --- 1209 unchanged lines hidden --- |