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General informations

The Linux kernel configuration item CONFIG_NVDIMM_KMSAN:

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KMSAN, and other memory debug facilities, increase the size of 'struct page' to contain extra metadata. This collides with the NVDIMM capability to store a potentially larger-than-"System RAM" size 'struct page' array in a reservation of persistent memory rather than limited / precious DRAM. However, that reservation needs to persist for the life of the given NVDIMM namespace. If you are using KMSAN to debug an issue unrelated to NVDIMMs or DAX then say N to this option. Otherwise, say Y but understand that any namespaces (with the page array stored pmem) created with this build of the kernel will permanently reserve and strand excess capacity compared to the KMSAN=n case.

Select N if unsure.



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