This read-only integer reports the amount of free memory in the low memory region described by cpqLinOsMemLowTotal. An admin monitors this because kernel data structures can only be allocated from low memory, so this value running low can cause kernel-level failures even when total system memory looks fine. For example, a server experiencing kernel allocation errors while cpqLinOsMemFree still looks adequate would lead an admin to check this object and discover the low-memory pool specifically has been exhausted.