netdev - Re: [PATCH RFC 3/5] printk: modify printk interface for syslog

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Message-ID: <50B0ADDB.4000303@gmail.com>
Date:	Sat, 24 Nov 2012 19:22:03 +0800
From:	Libo Chen <chenlibo.3@...il.com>
To:	"Serge E. Hallyn" <serge@...lyn.com>
CC:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	containers@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: Re: [PATCH RFC 3/5] printk: modify printk interface for syslog_namespace

On 2012/11/22 1:49, Serge E. Hallyn wrote:

> I notice that you haven't made any changes to the struct cont.  I
> suspect this means that to-be-continued msgs from one ns can be
> erroneously mixed with another ns.
>
Yes, I confirmed this problem. There will be erroneously mixed with another ns.
Thank you very much.

> You said you don't mind putting the syslogns into the userns.  If
> there's no reason not to do that, then we should do so as it will
> remove a bunch of code (plus the use of a new CLONE flag) from your
> patch, and the new syslog(NEW_NS) command from mine.
>
I agree with you, both are removable.

> Now IMO the ideal place for syslog_ns would be in the devices ns,
> but that does not yet exist, and may never.  The bonus to that would
> be that the consoles sort of belong there.  I avoid this by not
> having consoles in child syslog namespaces.  You put the console in
> the ns.  I haven't looked closely enough to see if what you do is
> ok (will do so soon).
>
> WOuld you mind looking through my patch to see if it suffices for
> your needs?  Where it does not, patches would be greatly appreciated
> if simple enough.

follow your patch, I can see inject message by "dmesg call" in container, is right?
I am worry that I debug  or see messages from serial ports console in some embedded system,
since console belongs to init_syslog,  so the message in container can`t be printed. 

> Note I'm not at all wedded to my patchset.  I'm happy to go with
> something else entirely.  My set was just a proof of concept.
>
>
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