recon_alloc memory function returns memory used more than physical memory of the VM

[amarBitMan]

recon_alloc:set_unit(gigabyte).
recon_alloc:memory(used, max).
397.1961054801941
recon_alloc:memory(allocated, max).
411.4017143249512

free -h
               total        used        free      shared  buff/cache   available
Mem:            98Gi        71Gi        14Gi       419Mi        11Gi        24Gi
Swap:             0B          0B          0B

[ferd]

This function just sums up the values reported by the VM's many allocators:

recon/src/recon_alloc.erl

Lines 207 to 214 in 9efec26

	memory(used,Keyword) ->
	lists:sum(lists:map(fun({_,Prop}) ->
	container_size(Prop,Keyword,blocks_size)
	end,util_alloc()));
	memory(allocated,Keyword) ->
	lists:sum(lists:map(fun({_,Prop}) ->
	container_size(Prop,Keyword,carriers_size)
	end,util_alloc()));

If there's a disagreement, it's either an consequence of very fast allocation and deallocation while the various allocators are probed, or an inconsistency between what the VM reports (which I'd push back to the OTP team) or the way the OS calculates it in its own reports.