netdev - tcp_bind_bucket is missing from slabinfo

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Message-ID: <20180223225030.2e8ef122@shemminger-XPS-13-9360>
Date:   Fri, 23 Feb 2018 22:50:30 -0800
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     netdev@...r.kernel.org, linux-mm@...ck.org
Subject: tcp_bind_bucket is missing from slabinfo

Somewhere back around 3.17 the kmem cache "tcp_bind_bucket" dropped out
of /proc/slabinfo. It turns out the ss command was dumpster diving
in slabinfo to determine the number of bound sockets and now it always
reports 0.

Not sure why, the cache is still created but it doesn't
show in slabinfo. Could it be some part of making slab/slub common code
(or network namespaces). The cache is created in tcp_init but not visible.

Any ideas?