netdev - Re: [PATCH 0/2] mark some slabs as visible not mergeable

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Message-Id: <20180226.201355.1546591469388453458.davem@davemloft.net>
Date:   Mon, 26 Feb 2018 20:13:55 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     stephen@...workplumber.org
Cc:     willy@...radead.org, netdev@...r.kernel.org, linux-mm@...ck.org,
        ikomyagin@...il.com, sthemmin@...rosoft.com
Subject: Re: [PATCH 0/2] mark some slabs as visible not mergeable

From: Stephen Hemminger <stephen@...workplumber.org>
Date: Mon, 26 Feb 2018 13:46:13 -0800

> This is ancient original iproute2 code that dumpster dives into
> slabinfo to get summary statistics on active objects.
> 
> 	1) open sockets (sock_inode_cache)

The sockets inuse counter from /proc/net/sockstat is really
sufficient for this.

> 	2) TCP ports bound (tcp_bind_buckets) [*]
> 	3) TCP time wait sockets (tw_sock_TCP) [*]

Time wait is provided by /proc/net/sockstat as well.

> 	4) TCP syn sockets (request_sock_TCP) [*]

It shouldn't be too hard to fill in the last two gaps, maintaining a
counter for bind buckets and request socks, and exporting them in new
/proc/net/sockstat field.

That would be so much better than disabling a useful optimization
in the SLAB allocator.

Thank you.