netdev - Re: [PATCH 2/2] net: Implement SO_PASSCGROUP to enable passing cgroup path

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Message-ID: <CALCETrXbATieFBmFb0SzR=pwsAZ7KvAubFi1EcesuFkOKA_=eQ@mail.gmail.com>
Date:	Thu, 17 Apr 2014 12:23:52 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Simo Sorce <ssorce@...hat.com>, Daniel J Walsh <dwalsh@...hat.com>,
	David Miller <davem@...emloft.net>, Tejun Heo <tj@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	lpoetter@...hat.com, cgroups@...r.kernel.org, kay@...hat.com,
	Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCH 2/2] net: Implement SO_PASSCGROUP to enable passing cgroup path

On Thu, Apr 17, 2014 at 11:50 AM, Vivek Goyal <vgoyal@...hat.com> wrote:
> On Thu, Apr 17, 2014 at 02:23:33PM -0400, Simo Sorce wrote:
>> Perhaps this could be done with a sendmsg() header flag or simplified
>> ancillary data even, rather than forcing the sender process to retrieve
>> and construct the whole information which is already available in
>> kernel.
>
> So what would be the protocol here? When should somebody send an
> SCM_CGROUP message using sendmsg()?
>

Presumably whenever it knows talking to someone who cares about the
cgroup.  Since I don't understand why you would want to know someone's
cgroup when speaking a protocol that didn't previously require cgroup
infomation, I don't really have a good answer for you.

--Andy
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