diff options
Diffstat (limited to 'mm/Kconfig')
| -rw-r--r-- | mm/Kconfig | 38 |
1 files changed, 35 insertions, 3 deletions
@@ -6,6 +6,7 @@ choice prompt "Memory model" depends on SELECT_MEMORY_MODEL default DISCONTIGMEM_MANUAL if ARCH_DISCONTIGMEM_DEFAULT + default SPARSEMEM_MANUAL if ARCH_SPARSEMEM_DEFAULT default FLATMEM_MANUAL config FLATMEM_MANUAL @@ -17,7 +18,15 @@ config FLATMEM_MANUAL only have one option here: FLATMEM. This is normal and a correct option. - If unsure, choose this option over any other. + Some users of more advanced features like NUMA and + memory hotplug may have different options here. + DISCONTIGMEM is an more mature, better tested system, + but is incompatible with memory hotplug and may suffer + decreased performance over SPARSEMEM. If unsure between + "Sparse Memory" and "Discontiguous Memory", choose + "Discontiguous Memory". + + If unsure, choose this option (Flat Memory) over any other. config DISCONTIGMEM_MANUAL bool "Discontigious Memory" @@ -35,15 +44,38 @@ config DISCONTIGMEM_MANUAL If unsure, choose "Flat Memory" over this option. +config SPARSEMEM_MANUAL + bool "Sparse Memory" + depends on ARCH_SPARSEMEM_ENABLE + help + This will be the only option for some systems, including + memory hotplug systems. This is normal. + + For many other systems, this will be an alternative to + "Discontigious Memory". This option provides some potential + performance benefits, along with decreased code complexity, + but it is newer, and more experimental. + + If unsure, choose "Discontiguous Memory" or "Flat Memory" + over this option. + endchoice config DISCONTIGMEM def_bool y depends on (!SELECT_MEMORY_MODEL && ARCH_DISCONTIGMEM_ENABLE) || DISCONTIGMEM_MANUAL +config SPARSEMEM + def_bool y + depends on SPARSEMEM_MANUAL + config FLATMEM def_bool y - depends on !DISCONTIGMEM || FLATMEM_MANUAL + depends on (!DISCONTIGMEM && !SPARSEMEM) || FLATMEM_MANUAL + +config FLAT_NODE_MEM_MAP + def_bool y + depends on !SPARSEMEM # # Both the NUMA code and DISCONTIGMEM use arrays of pg_data_t's @@ -56,4 +88,4 @@ config NEED_MULTIPLE_NODES config HAVE_MEMORY_PRESENT def_bool y - depends on ARCH_HAVE_MEMORY_PRESENT + depends on ARCH_HAVE_MEMORY_PRESENT || SPARSEMEM |