linux-kernel - Re: [PATCH 4/7] netprio_cgroup: limit the maximum css->id to USHRT

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Date:	Fri, 20 Nov 2015 10:18:14 +0100
From:	Daniel Wagner <daniel.wagner@...-carit.de>
To:	Tejun Heo <tj@...nel.org>, <davem@...emloft.net>,
	<pablo@...filter.org>, <kaber@...sh.net>,
	<kadlec@...ckhole.kfki.hu>, <lizefan@...wei.com>,
	<hannes@...xchg.org>
CC:	<netdev@...r.kernel.org>, <netfilter-devel@...r.kernel.org>,
	<coreteam@...filter.org>, <cgroups@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <kernel-team@...com>,
	<daniel@...earbox.net>, <nhorman@...driver.com>
Subject: Re: [PATCH 4/7] netprio_cgroup: limit the maximum css->id to
 USHRT_MAX

On 11/19/2015 07:52 PM, Tejun Heo wrote:
> netprio builds per-netdev contiguous priomap array which is indexed by
> css->id.  The array is allocated using kzalloc() effectively limiting
> the maximum ID supported to some thousand range.  This patch caps the
> maximum supported css->id to USHRT_MAX which should be way above what
> is actually useable.
> 
> This allows reducing sock->sk_cgrp_prioidx to u16 from u32.  The freed
> up part will be used to overload the cgroup related fields.
> sock->sk_cgrp_prioidx's position is swapped with sk_mark so that the
> two cgroup related fields are adjacent.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Cc: Daniel Borkmann <daniel@...earbox.net>
> Cc: Daniel Wagner <daniel.wagner@...-carit.de>

Acked-by: Daniel Wagner <daniel.wagner@...-carit.de>
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