From: KOSAKI Motohiro <kosaki.motohiro-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: David Rientjes <rientjes-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
Cc: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
mhocko-AlSwsSmVLrQ@public.gmane.org,
linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org,
hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org,
cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
KOSAKI Motohiro
<kosaki.motohiro-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org,
containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org
Subject: Re: [PATCH] meminfo: show /proc/meminfo base on container's memcg
Date: Thu, 31 May 2012 02:23:26 -0400 [thread overview]
Message-ID: <4FC70E5E.1010003@gmail.com> (raw)
In-Reply-To: <alpine.DEB.2.00.1205302314190.25774-X6Q0R45D7oAcqpCFd4KODRPsWskHk0ljAL8bYrjMMd8@public.gmane.org>
(5/31/12 2:17 AM), David Rientjes wrote:
> On Thu, 31 May 2012, Kamezawa Hiroyuki wrote:
>
>>> The bottomline is that /proc/meminfo is one of many global resource state
>>> interfaces and doesn't imply that every thread has access to the full
>>> resources. It never has. It's very simple for another thread to consume
>>> a large amount of memory as soon as your read() of /proc/meminfo completes
>>> and then that information is completely bogus.
>>
>> Why you need to discuss this here ? We know all information are snapshot.
>>
>
> MemTotal is usually assumed to be static from /proc/meminfo and could now
> change radically without notification to the application.
>
>> Hmm....maybe need to mount cgroup in the container (again) and get an access
>> to cgroup
>> hierarchy and find the cgroup it belongs to......if it's allowed.
>
> An application should always know the cgroup that its attached to and be
> able to read its state using the command that I gave earlier.
No. you don't need why userland folks want namespaces. Even though you don't
need namespaces. It doesn't good reason to refuse another use case.
WARNING: multiple messages have this Message-ID (diff)
From: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
To: David Rientjes <rientjes@google.com>
Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
KOSAKI Motohiro <kosaki.motohiro@gmail.com>,
Gao feng <gaofeng@cn.fujitsu.com>,
hannes@cmpxchg.org, mhocko@suse.cz, bsingharora@gmail.com,
akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
cgroups@vger.kernel.org, linux-mm@kvack.org,
containers@lists.linux-foundation.org
Subject: Re: [PATCH] meminfo: show /proc/meminfo base on container's memcg
Date: Thu, 31 May 2012 02:23:26 -0400 [thread overview]
Message-ID: <4FC70E5E.1010003@gmail.com> (raw)
In-Reply-To: <alpine.DEB.2.00.1205302314190.25774@chino.kir.corp.google.com>
(5/31/12 2:17 AM), David Rientjes wrote:
> On Thu, 31 May 2012, Kamezawa Hiroyuki wrote:
>
>>> The bottomline is that /proc/meminfo is one of many global resource state
>>> interfaces and doesn't imply that every thread has access to the full
>>> resources. It never has. It's very simple for another thread to consume
>>> a large amount of memory as soon as your read() of /proc/meminfo completes
>>> and then that information is completely bogus.
>>
>> Why you need to discuss this here ? We know all information are snapshot.
>>
>
> MemTotal is usually assumed to be static from /proc/meminfo and could now
> change radically without notification to the application.
>
>> Hmm....maybe need to mount cgroup in the container (again) and get an access
>> to cgroup
>> hierarchy and find the cgroup it belongs to......if it's allowed.
>
> An application should always know the cgroup that its attached to and be
> able to read its state using the command that I gave earlier.
No. you don't need why userland folks want namespaces. Even though you don't
need namespaces. It doesn't good reason to refuse another use case.
--
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WARNING: multiple messages have this Message-ID (diff)
From: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
To: David Rientjes <rientjes@google.com>
Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
KOSAKI Motohiro <kosaki.motohiro@gmail.com>,
Gao feng <gaofeng@cn.fujitsu.com>,
hannes@cmpxchg.org, mhocko@suse.cz, bsingharora@gmail.com,
akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
cgroups@vger.kernel.org, linux-mm@kvack.org,
containers@lists.linux-foundation.org
Subject: Re: [PATCH] meminfo: show /proc/meminfo base on container's memcg
Date: Thu, 31 May 2012 02:23:26 -0400 [thread overview]
Message-ID: <4FC70E5E.1010003@gmail.com> (raw)
In-Reply-To: <alpine.DEB.2.00.1205302314190.25774@chino.kir.corp.google.com>
(5/31/12 2:17 AM), David Rientjes wrote:
> On Thu, 31 May 2012, Kamezawa Hiroyuki wrote:
>
>>> The bottomline is that /proc/meminfo is one of many global resource state
>>> interfaces and doesn't imply that every thread has access to the full
>>> resources. It never has. It's very simple for another thread to consume
>>> a large amount of memory as soon as your read() of /proc/meminfo completes
>>> and then that information is completely bogus.
>>
>> Why you need to discuss this here ? We know all information are snapshot.
>>
>
> MemTotal is usually assumed to be static from /proc/meminfo and could now
> change radically without notification to the application.
>
>> Hmm....maybe need to mount cgroup in the container (again) and get an access
>> to cgroup
>> hierarchy and find the cgroup it belongs to......if it's allowed.
>
> An application should always know the cgroup that its attached to and be
> able to read its state using the command that I gave earlier.
No. you don't need why userland folks want namespaces. Even though you don't
need namespaces. It doesn't good reason to refuse another use case.
next prev parent reply other threads:[~2012-05-31 6:23 UTC|newest]
Thread overview: 113+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-29 2:56 [PATCH] meminfo: show /proc/meminfo base on container's memcg Gao feng
2012-05-29 2:56 ` Gao feng
[not found] ` <1338260214-21919-1-git-send-email-gaofeng-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org>
2012-05-29 8:24 ` Glauber Costa
2012-05-29 8:24 ` Glauber Costa
2012-05-29 8:24 ` Glauber Costa
2012-05-29 8:24 ` Glauber Costa
2012-05-30 21:38 ` David Rientjes
2012-05-30 21:38 ` David Rientjes
2012-05-30 21:38 ` David Rientjes
2012-05-30 21:38 ` David Rientjes
2012-05-30 23:20 ` Kirill A. Shutemov
2012-05-30 23:20 ` Kirill A. Shutemov
[not found] ` <20120530232004.GA15423-oKw7cIdHH8eLwutG50LtGA@public.gmane.org>
2012-05-31 0:35 ` David Rientjes
2012-05-31 0:35 ` David Rientjes
2012-05-31 0:35 ` David Rientjes
[not found] ` <alpine.DEB.2.00.1205301433490.9716-X6Q0R45D7oAcqpCFd4KODRPsWskHk0ljAL8bYrjMMd8@public.gmane.org>
2012-05-30 23:20 ` Kirill A. Shutemov
2012-05-31 0:08 ` Kamezawa Hiroyuki
2012-05-31 0:08 ` Kamezawa Hiroyuki
2012-05-31 0:08 ` Kamezawa Hiroyuki
[not found] ` <4FC6B68C.2070703-+CUm20s59erQFUHtdCDX3A@public.gmane.org>
2012-05-31 0:22 ` KOSAKI Motohiro
2012-05-31 0:22 ` KOSAKI Motohiro
2012-05-31 0:22 ` KOSAKI Motohiro
2012-05-31 0:22 ` KOSAKI Motohiro
[not found] ` <CAHGf_=pFbsy4FO_UNu6O1-KyTd6O=pkmR8=3EGuZB5Reu3Vb9w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-05-31 0:33 ` Kamezawa Hiroyuki
2012-05-31 0:33 ` Kamezawa Hiroyuki
2012-05-31 0:33 ` Kamezawa Hiroyuki
[not found] ` <4FC6BC3E.5010807-+CUm20s59erQFUHtdCDX3A@public.gmane.org>
2012-05-31 0:44 ` David Rientjes
2012-05-31 0:44 ` David Rientjes
2012-05-31 0:44 ` David Rientjes
[not found] ` <alpine.DEB.2.00.1205301737530.25774-X6Q0R45D7oAcqpCFd4KODRPsWskHk0ljAL8bYrjMMd8@public.gmane.org>
2012-05-31 0:53 ` Kamezawa Hiroyuki
2012-05-31 0:53 ` Kamezawa Hiroyuki
2012-05-31 0:53 ` Kamezawa Hiroyuki
[not found] ` <4FC6C111.2060108-+CUm20s59erQFUHtdCDX3A@public.gmane.org>
2012-05-31 1:31 ` David Rientjes
2012-05-31 1:31 ` David Rientjes
2012-05-31 1:31 ` David Rientjes
[not found] ` <alpine.DEB.2.00.1205301831270.25774-X6Q0R45D7oAcqpCFd4KODRPsWskHk0ljAL8bYrjMMd8@public.gmane.org>
2012-05-31 2:33 ` Kamezawa Hiroyuki
2012-05-31 2:33 ` Kamezawa Hiroyuki
2012-05-31 2:33 ` Kamezawa Hiroyuki
2012-05-31 5:02 ` David Rientjes
2012-05-31 5:02 ` David Rientjes
2012-05-31 5:36 ` Kamezawa Hiroyuki
2012-05-31 5:36 ` Kamezawa Hiroyuki
[not found] ` <4FC70355.70805-+CUm20s59erQFUHtdCDX3A@public.gmane.org>
2012-05-31 6:17 ` David Rientjes
2012-05-31 6:17 ` David Rientjes
2012-05-31 6:17 ` David Rientjes
[not found] ` <alpine.DEB.2.00.1205302314190.25774-X6Q0R45D7oAcqpCFd4KODRPsWskHk0ljAL8bYrjMMd8@public.gmane.org>
2012-05-31 6:23 ` KOSAKI Motohiro [this message]
2012-05-31 6:23 ` KOSAKI Motohiro
2012-05-31 6:23 ` KOSAKI Motohiro
[not found] ` <4FC70E5E.1010003-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2012-05-31 6:28 ` David Rientjes
2012-05-31 6:28 ` David Rientjes
2012-05-31 6:28 ` David Rientjes
[not found] ` <alpine.DEB.2.00.1205302325500.25774-X6Q0R45D7oAcqpCFd4KODRPsWskHk0ljAL8bYrjMMd8@public.gmane.org>
2012-05-31 6:37 ` KOSAKI Motohiro
2012-05-31 6:37 ` KOSAKI Motohiro
2012-05-31 6:37 ` KOSAKI Motohiro
[not found] ` <4FC711A5.4090003-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2012-05-31 6:56 ` David Rientjes
2012-05-31 6:56 ` David Rientjes
2012-05-31 6:56 ` David Rientjes
[not found] ` <alpine.DEB.2.00.1205302351510.25774-X6Q0R45D7oAcqpCFd4KODRPsWskHk0ljAL8bYrjMMd8@public.gmane.org>
2012-05-31 7:09 ` KOSAKI Motohiro
2012-05-31 7:09 ` KOSAKI Motohiro
2012-05-31 7:09 ` KOSAKI Motohiro
[not found] ` <CAHGf_=qVDVT6VW2j9gE3bQKwizW24iivrDryiCKoxVu4m_fWKw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-05-31 7:35 ` David Rientjes
2012-05-31 7:35 ` David Rientjes
2012-05-31 7:35 ` David Rientjes
[not found] ` <alpine.DEB.2.00.1205310028420.8864-X6Q0R45D7oAcqpCFd4KODRPsWskHk0ljAL8bYrjMMd8@public.gmane.org>
2012-05-31 7:42 ` KOSAKI Motohiro
2012-05-31 7:42 ` KOSAKI Motohiro
2012-05-31 7:42 ` KOSAKI Motohiro
2012-05-31 7:42 ` KOSAKI Motohiro
[not found] ` <4FC720EE.3010307-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2012-05-31 7:57 ` Johannes Weiner
2012-05-31 7:57 ` Johannes Weiner
2012-05-31 7:57 ` Johannes Weiner
2012-05-31 7:57 ` Johannes Weiner
2012-05-31 7:58 ` Gao feng
2012-05-31 7:58 ` Gao feng
2012-05-31 7:58 ` Gao feng
2012-05-31 8:32 ` Glauber Costa
2012-05-31 8:32 ` Glauber Costa
2012-05-31 8:32 ` Glauber Costa
[not found] ` <4FC72CA4.6080708-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2012-05-31 8:51 ` Kamezawa Hiroyuki
2012-05-31 8:51 ` Kamezawa Hiroyuki
2012-05-31 8:51 ` Kamezawa Hiroyuki
[not found] ` <4FC73110.6010107-+CUm20s59erQFUHtdCDX3A@public.gmane.org>
2012-05-31 8:59 ` Glauber Costa
2012-05-31 8:59 ` Glauber Costa
2012-05-31 8:59 ` Glauber Costa
2012-05-31 8:51 ` Kamezawa Hiroyuki
2012-05-31 8:55 ` Gao feng
2012-05-31 8:55 ` Gao feng
2012-05-31 8:55 ` Gao feng
2012-05-31 8:55 ` Gao feng
[not found] ` <4FC73203.2070009-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org>
2012-05-31 8:56 ` Glauber Costa
2012-05-31 8:56 ` Glauber Costa
2012-05-31 8:56 ` Glauber Costa
2012-05-31 8:56 ` Glauber Costa
[not found] ` <4FC724B1.70508-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org>
2012-05-31 8:32 ` Glauber Costa
2012-05-31 7:58 ` Gao feng
2012-05-31 7:35 ` David Rientjes
2012-05-31 7:07 ` Kamezawa Hiroyuki
2012-05-31 7:07 ` Kamezawa Hiroyuki
2012-05-31 7:07 ` Kamezawa Hiroyuki
[not found] ` <4FC718BA.8060608-+CUm20s59erQFUHtdCDX3A@public.gmane.org>
2012-05-31 7:23 ` KOSAKI Motohiro
2012-05-31 7:23 ` KOSAKI Motohiro
2012-05-31 7:23 ` KOSAKI Motohiro
2012-05-31 7:07 ` Kamezawa Hiroyuki
2012-05-31 8:29 ` Glauber Costa
2012-05-31 8:29 ` Glauber Costa
2012-05-31 8:29 ` Glauber Costa
[not found] ` <alpine.DEB.2.00.1205302156090.25774-X6Q0R45D7oAcqpCFd4KODRPsWskHk0ljAL8bYrjMMd8@public.gmane.org>
2012-05-31 5:36 ` Kamezawa Hiroyuki
[not found] ` <4FC6D881.4090706-+CUm20s59erQFUHtdCDX3A@public.gmane.org>
2012-05-31 5:02 ` David Rientjes
2012-05-31 0:44 ` David Rientjes
2012-05-31 0:33 ` Kamezawa Hiroyuki
2012-06-07 23:18 ` Zhu Yanhai
2012-06-07 23:18 ` Zhu Yanhai
2012-06-07 23:18 ` Zhu Yanhai
-- strict thread matches above, loose matches on Subject: below --
2012-05-29 2:56 Gao feng
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