Hi On 08/25/2011 04:16 AM, Eric W. Biederman wrote: > KAMEZAWA Hiroyuki<kamezawa.hiroyu@xxxxxxxxxxxxxx> writes: > >> On Wed, 24 Aug 2011 22:28:59 -0300 >> Glauber Costa<glommer@xxxxxxxxxxxxx> wrote: >> >>> On 08/24/2011 09:35 PM, Eric W. Biederman wrote: >>>> Glauber Costa<glommer@xxxxxxxxxxxxx> writes: >>> Hi Eric, >>> >>> Thanks for your attention. >>> >>> So, this that you propose was my first implementation. I ended up >>> throwing it away after playing with it for a while. >>> >>> One of the first problems that arise from that, is that the sysctls are >>> a tunable visible from inside the container. Those limits, however, are >>> to be set from the outside world. The code is not much better than that >>> either, and instead of creating new cgroup structures and linking them >>> to the protocol, we end up doing it for net ns. We end up increasing >>> structures just the same... > > You don't need to add a netns member to sockets. > > But I do agree that there are odd permission issues with using the > existing sysctls and making them per namespace. > > However almost everything I have seen with memory limits I have found > very strange. They all seem like a very bad version of disabling memory > over commits. Please apply the same rules for not cursing my family no further then the 3rd generation for my idea: I'd like to solve a use case where it is necessary to count all bytes transmitted and received by an application [1]. So far I have found two unsatisfying solution for it. The first one is to hook into libc and count the bytes there. I don't think I have to say I don't like this. The second idea was to use the trick Google has used for Android [2]. They add a hook into __sock_sendmsg and __sock_recvmsg and then count the bytes per UID. To get this working all application have to use an unique UID. So not very nice either. After reading a bit up on cgroup I think that would be the right place to count the traffic. Unfortunately, with net_cls I can count the outgoing traffic but not the incoming one. If I understood Glauber approach correctly adding some statistic counters would be easy to do. Of course I don't know the impact of this. thanks, daniel [1] http://lists.freedesktop.org/archives/systemd-devel/2011-August/003093.html [2] http://xf.iksaif.net/dev/android/android-2.6.29-to-2.6.32/0083-uidstat-Adding-uid-stat-driver-to-collect-network-st.patch _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/containers
