Socket memory usage is visible in /proc/net/sockstat.
sockets: used 870
TCP: inuse 21 orphan 0 tw 0 alloc 28 mem 10
UDP: inuse 9 mem 6
UDPLITE: inuse 0
RAW: inuse 0
FRAG: inuse 0 memory 0
This shows that the system currently using 10 pages for TCP sockets and 6 pages for UDP sockets. Note that the low, threshold and high settings in net.ipv4.tcp_mem are set in pages too.
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