netdev - Re: ss -p is much too slow

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Date:	Sat, 31 Jul 2010 19:33:51 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	David Miller <davem@...emloft.net>
Cc:	sphink@...il.com, netdev@...r.kernel.org,
	stephen.hemminger@...tta.com
Subject: Re: ss -p is much too slow

On Mon, 28 Jun 2010 16:21:39 -0700 (PDT)
David Miller <davem@...emloft.net> wrote:

> From: Steve Fink <sphink@...il.com>
> Date: Wed, 9 Jun 2010 11:42:38 -0700
> 
> > On closer inspection, it appears that ss -p does a quadratic scan. It
> > rescans every entry in /proc/*/fd/* repeatedly (once per listening
> > port? per process? I don't remember what I figured out.)
> > 
> > I humbly suggest that this is not a good idea.
> 
> Yep, this is junk.  Please give this patch a try:
> 
> ss: Avoid quadradic complexity with '-p'
> 
> Scan the process list of open sockets once, and store in a hash
> table to be used by subsequent find_user() calls.
> 
> Reported-by: Steve Fink <sphink@...il.com>
> Signed-off-by: David S. Miller <davem@...emloft.net>

Applied


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