netdev - Re: tcp_bind_bucket is missing from slabinfo

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Message-ID: <20180224143520.GA22222@bombadil.infradead.org>
Date:   Sat, 24 Feb 2018 06:35:20 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     netdev@...r.kernel.org, linux-mm@...ck.org
Subject: Re: tcp_bind_bucket is missing from slabinfo

On Fri, Feb 23, 2018 at 10:50:30PM -0800, Stephen Hemminger wrote:
> 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?

Try booting with slab_nomerge=1