On 05/07/2018 07:33 PM, Huaisheng HS1 Ye wrote: > diff --git a/mm/Kconfig b/mm/Kconfig > index c782e8f..5fe1f63 100644 > --- a/mm/Kconfig > +++ b/mm/Kconfig > @@ -687,6 +687,22 @@ config ZONE_DEVICE > > +config ZONE_NVM > + bool "Manage NVDIMM (pmem) by memory management (EXPERIMENTAL)" > + depends on NUMA && X86_64 Hi, I'm curious why this depends on NUMA. Couldn't it be useful in non-NUMA (i.e., UMA) configs? Thanks. > + depends on HAVE_MEMBLOCK_NODE_MAP > + depends on HAVE_MEMBLOCK > + depends on !IA32_EMULATION > + default n > + > + help > + This option allows you to use memory management subsystem to manage > + NVDIMM (pmem). With it mm can arrange NVDIMMs into real physical zones > + like NORMAL and DMA32. That means buddy system and swap can be used > + directly to NVDIMM zone. This feature is beneficial to recover > + dirty pages from power fail or system crash by storing write cache > + to NVDIMM zone. -- ~Randy
