Message-ID: <567616D6.6060202@cn.fujitsu.com>
Date: Sun, 20 Dec 2015 10:47:50 +0800
From: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
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To: Al Viro <viro@ZenIV.linux.org.uk>
CC: <containers@lists.linux-foundation.org>,
        "Eric W. Biederman" <ebiederm@xmission.com>,
        LKML <linux-kernel@vger.kernel.org>, <cgroups@vger.kernel.org>
Subject: Re: [Propose] Isolate core_pattern in mnt namespace.
References: <56729B3D.1040502@cn.fujitsu.com> <56760F05.3020308@cn.fujitsu.com> <20151220023712.GT20997@ZenIV.linux.org.uk>
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On 12/20/2015 10:37 AM, Al Viro wrote:
> On Sun, Dec 20, 2015 at 10:14:29AM +0800, Dongsheng Yang wrote:
>> On 12/17/2015 07:23 PM, Dongsheng Yang wrote:
>>> Hi guys,
>>>      We are working on making core dump behaviour isolated in
>>> container. But the problem is, the /proc/sys/kernel/core_pattern
>>> is a kernel wide setting, not belongs to a container.
>>>
>>>      So we want to add core_pattern into mnt namespace. What
>>> do you think about it?
>>
>> Hi Eric,
>> 	I found your patch about "net: Implement the per network namespace
>> sysctl infrastructure", I want to do the similar thing
>> in mnt namespace. Is that suggested way?
>
> Why mnt namespace and not something else?

Hi Al,

Well, because core_pattern indicates the path to store core file.
In different mnt namespace, we would like to change the path with
different value.

In addition, Let's considering other namespaces:
UTS ns: contains informations of kernel and arch, not proper for 
core_pattern.
IPC ns: communication informations, not proper for core_pattern
PID ns: core_pattern is not related with pid
net ns: obviousely no.
user ns: not proper too.

Then I believe it's better to do this in mnt namespace. of course,
core_pattern is just one example. After this infrastructure finished,
we can implement more sysctls as per-mnt if necessary, I think.

Al, what do you think about this idea?

Yang
>
>
> .
>


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