Can we get data into prometheus for /sys/devices/system/node/node*/meminfo? This is similar to (but not quite identical to!) /proc/meminfo, but broken out per NUMA node. On machines with numa_networking = isolate config, this level of detail becomes necessary to make sense of memory pressure issues. Seems like someone's done the hard bits at https://github.com/prometheus/node_exporter/blob/master/collector/meminfo_numa_linux.go .
Example from cp4021 (note that Node0 has 256GB and uses almost all of it for active malloc'd memory, while Node1 has only 128GB and uses it mostly for disk cache):
root@cp4021:~# cat /sys/devices/system/node/node0/meminfo Node 0 MemTotal: 264076160 kB Node 0 MemFree: 3563420 kB Node 0 MemUsed: 260512740 kB Node 0 Active: 256613464 kB Node 0 Inactive: 2187088 kB Node 0 Active(anon): 250546696 kB Node 0 Inactive(anon): 27468 kB Node 0 Active(file): 6066768 kB Node 0 Inactive(file): 2159620 kB Node 0 Unevictable: 0 kB Node 0 Mlocked: 0 kB Node 0 Dirty: 56 kB Node 0 Writeback: 0 kB Node 0 FilePages: 9442920 kB Node 0 Mapped: 9149340 kB Node 0 AnonPages: 249357760 kB Node 0 Shmem: 1216532 kB Node 0 KernelStack: 14480 kB Node 0 PageTables: 711808 kB Node 0 NFS_Unstable: 0 kB Node 0 Bounce: 0 kB Node 0 WritebackTmp: 0 kB Node 0 Slab: 241800 kB Node 0 SReclaimable: 27656 kB Node 0 SUnreclaim: 214144 kB Node 0 AnonHugePages: 0 kB Node 0 ShmemHugePages: 0 kB Node 0 ShmemPmdMapped: 0 kB Node 0 HugePages_Total: 0 Node 0 HugePages_Free: 0 Node 0 HugePages_Surp: 0 root@cp4021:~# cat /sys/devices/system/node/node1/meminfo Node 1 MemTotal: 132105144 kB Node 1 MemFree: 874332 kB Node 1 MemUsed: 131230812 kB Node 1 Active: 118972632 kB Node 1 Inactive: 4037628 kB Node 1 Active(anon): 8783376 kB Node 1 Inactive(anon): 291344 kB Node 1 Active(file): 110189256 kB Node 1 Inactive(file): 3746284 kB Node 1 Unevictable: 7932 kB Node 1 Mlocked: 7932 kB Node 1 Dirty: 18076 kB Node 1 Writeback: 0 kB Node 1 FilePages: 114680792 kB Node 1 Mapped: 113849104 kB Node 1 AnonPages: 8337800 kB Node 1 Shmem: 741532 kB Node 1 KernelStack: 14648 kB Node 1 PageTables: 2876748 kB Node 1 NFS_Unstable: 0 kB Node 1 Bounce: 0 kB Node 1 WritebackTmp: 0 kB Node 1 Slab: 4794484 kB Node 1 SReclaimable: 4710160 kB Node 1 SUnreclaim: 84324 kB Node 1 AnonHugePages: 0 kB Node 1 ShmemHugePages: 0 kB Node 1 ShmemPmdMapped: 0 kB Node 1 HugePages_Total: 0 Node 1 HugePages_Free: 0 Node 1 HugePages_Surp: 0