[PATCH 1/4] Save free memory in the node infos
This commit adds a new field free_mem to the node_info struct and augments the 15.08 RPC protocol to exchange this information as part of the ping and registration status messages. The free memory is taken from the sysinfo() information on systems that support this function. Overall, the implementation sticks to the way cpu_load (the 5 min load average) is handled.
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