May 16, 2023 7:19 PM, "Borislav Petkov" <bp@xxxxxxxxx> wrote: > On Tue, May 16, 2023 at 11:07:11AM +0000, Yajun Deng wrote: > >> It will help users to confirm which MC belongs to which node if there >> are multiple MCs. Therefore, we can also know how many dimm on each >> node. > > There are physical nodes, logical nodes, NUMA nodes, interleaving > between nodes... > Node is the NUMA node, We get the numa id by calling dev_to_node(). > Is there any practical use case and need behind this? > Some dimm may not be recognized when boot, we want to find it. The '/sys/devices/system/node/node0/meminfo' would show the memory on node0. If we have '/sys/devices/system/node/node0/mc0', by comparing the number of dimm and MemTotal in meminfo. It is easy to know that the dimm didn't recognized whether it belonged to this NUMA node or not. > -- > Regards/Gruss, > Boris. > > https://people.kernel.org/tglx/notes-about-netiquette
