diff options
Diffstat (limited to 'mm/Kconfig')
| -rw-r--r-- | mm/Kconfig | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/mm/Kconfig b/mm/Kconfig index 391ffc54d136..1a4473fcb2ca 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -111,3 +111,24 @@ config SPARSEMEM_STATIC config SPARSEMEM_EXTREME def_bool y depends on SPARSEMEM && !SPARSEMEM_STATIC + +# eventually, we can have this option just 'select SPARSEMEM' +config MEMORY_HOTPLUG + bool "Allow for memory hot-add" + depends on SPARSEMEM && HOTPLUG && !SOFTWARE_SUSPEND + +comment "Memory hotplug is currently incompatible with Software Suspend" + depends on SPARSEMEM && HOTPLUG && SOFTWARE_SUSPEND + +# Heavily threaded applications may benefit from splitting the mm-wide +# page_table_lock, so that faults on different parts of the user address +# space can be handled with less contention: split it at this NR_CPUS. +# Default to 4 for wider testing, though 8 might be more appropriate. +# ARM's adjust_pte (unused if VIPT) depends on mm-wide page_table_lock. +# PA-RISC's debug spinlock_t is too large for the 32-bit struct page. +# +config SPLIT_PTLOCK_CPUS + int + default "4096" if ARM && !CPU_CACHE_VIPT + default "4096" if PARISC && DEBUG_SPINLOCK && !64BIT + default "4" |