diff options
| -rw-r--r-- | init/Kconfig | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/init/Kconfig b/init/Kconfig index 79ac52bef4ce..dbc08baad77e 100644 --- a/init/Kconfig +++ b/init/Kconfig | |||
| @@ -388,9 +388,12 @@ config RCU_FANOUT | |||
| 388 | help | 388 | help |
| 389 | This option controls the fanout of hierarchical implementations | 389 | This option controls the fanout of hierarchical implementations |
| 390 | of RCU, allowing RCU to work efficiently on machines with | 390 | of RCU, allowing RCU to work efficiently on machines with |
| 391 | large numbers of CPUs. This value must be at least the cube | 391 | large numbers of CPUs. This value must be at least the fourth |
| 392 | root of NR_CPUS, which allows NR_CPUS up to 32,768 for 32-bit | 392 | root of NR_CPUS, which allows NR_CPUS to be insanely large. |
| 393 | systems and up to 262,144 for 64-bit systems. | 393 | The default value of RCU_FANOUT should be used for production |
| 394 | systems, but if you are stress-testing the RCU implementation | ||
| 395 | itself, small RCU_FANOUT values allow you to test large-system | ||
| 396 | code paths on small(er) systems. | ||
| 394 | 397 | ||
| 395 | Select a specific number if testing RCU itself. | 398 | Select a specific number if testing RCU itself. |
| 396 | Take the default if unsure. | 399 | Take the default if unsure. |