On 06/22/2012 05:07 PM, Dhaval Giani wrote: > Hi, > > On Thu, Jun 21, 2012 at 5:59 PM, Glauber Costa <glom...@parallels.com> wrote: >> Around one year ago, the following was reported: >> http://comments.gmane.org/gmane.comp.lib.libcg.devel/3116 >> (Error when calling cgroup_modify_cgroup()) >> >> Today, I ran into the very same error. Inspecting the code >> in libcg, it seemed to me that the best thing to avoid that >> is to never attempt to write something the user never wrote to. >> >> That is because if the user actually tries to write to a read-only >> file, we should yield an error, making skipping read-only a bad >> solution. >> >> My solution is to add a field to the value structure indicating >> whether or not it is dirty. cgroup_modify_cgroup then becomes a >> flusher, and the problem goes away. >> > > OK, good point. But consider the following use case. I want to > duplicate a cgroup, except for its name? > > Or, let's say CPU and cpuset are mounted together, and I want to just > modify the cpu parameters, and not cpuset. I duplicate the parent > using cgroup_get_cgroup, have a modified name, and modified cpu > paramenters, and then write to the child. How else do you suggest > doing that, apart from knowing how the cgroups is setup on that > system? > > How does one handle that case?
I don't follow totally. If I understand the API correctly, you would do get_cgroup() in cgroup A, and then use something like copy_cgroup(), right? If that is the case, you just dirty everything after copying. ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Libcg-devel mailing list Libcg-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/libcg-devel
