linux-kernel - Re: [RFC PATCH v3] net: sched: convert qdisc linked list to hashtable

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Date:	Tue, 12 Jul 2016 10:36:28 -0700
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	Jiri Kosina <jikos@...nel.org>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	Phil Sutter <phil@....cc>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v3] net: sched: convert qdisc linked list to hashtable

On Mon, Jul 11, 2016 at 7:02 AM, Jiri Kosina <jikos@...nel.org> wrote:
> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> index f45929c..0b5c172e 100644
> --- a/include/linux/netdevice.h
> +++ b/include/linux/netdevice.h
> @@ -52,6 +52,7 @@
>  #include <uapi/linux/netdevice.h>
>  #include <uapi/linux/if_bonding.h>
>  #include <uapi/linux/pkt_cls.h>
> +#include <linux/hashtable.h>
>
>  struct netpoll_info;
>  struct device;
> @@ -1778,6 +1779,7 @@ struct net_device {
>         unsigned int            num_tx_queues;
>         unsigned int            real_num_tx_queues;
>         struct Qdisc            *qdisc;
> +       DECLARE_HASHTABLE       (qdisc_hash, 4);
>         unsigned long           tx_queue_len;
>         spinlock_t              tx_global_lock;
>         int                     watchdog_timeo;

Should it be surrounded by CONFIG_NET_SCHED?
To save several bytes for !CONFIG_NET_SCHED case.