netdev - Re: [PATCH v7 2/3] sock: Move the socket inuse to namespace.

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Message-ID: <CAM_iQpXhuQ03LB+DsVU4z=m5BCOWKTP1j1oUnBX7-rWC=z_oSA@mail.gmail.com>
Date:   Mon, 18 Dec 2017 13:38:39 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     David Miller <davem@...emloft.net>
Cc:     Tonghao Zhang <xiangxia.m.yue@...il.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [PATCH v7 2/3] sock: Move the socket inuse to namespace.

On Mon, Dec 18, 2017 at 11:30 AM, David Miller <davem@...emloft.net> wrote:
> From: Tonghao Zhang <xiangxia.m.yue@...il.com>
> Date: Thu, 14 Dec 2017 05:51:58 -0800
>
>> In some case, we want to know how many sockets are in use in
>> different _net_ namespaces. It's a key resource metric.
>
> Useful or not, you're not exporting this value.
>
> All this patch series does is convert the existing export of the
> global tally to add up the per-net values.
>
> So if you're not exporting the per-net value on it's own in any way,
> this patch series isn't achieving the stated goal.
>
> I'm not applying this series, sorry.


This value is already exported via procfs:
sockstat_seq_show() -> socket_seq_show().

And the proc file itself should already be per-net:

static int sockstat_seq_open(struct inode *inode, struct file *file)
{
        return single_open_net(inode, file, sockstat_seq_show);
}


This patch just makes that value to be per-net too.