On 2023/08/28 15:39, Mathew T wrote: > Hi, > I am trying to figure out if I can extract the values associated with > cgroups from kernel crash dump. I can see "cgorup" is mounted when i > issue "mount" command in crash utility. And it shows mount/superblock > address. How can I further dig down and print the values inside cgroup > fs. Suppose if I want to print "/sys/fs/cgroup/cpu.stat" in the crash > utility!? The extension lscgroup / cgget are not working in latest > kernels.
As far as I know, there is no extension module that can print it with the recent cgroup implementation. Also, cgroup fs is a pseudo one. When you read a file in the fs, the kernel gathers information and prints it. So you need to (1) find out what is done by reading the file and (2) emulate it with crash commands. I'm not familiar with cgroup, but maybe it's good to start with cpu_stat_show() in kernel/cgroup/cgroup.c. Thanks, Kazu -- Crash-utility mailing list Crash-utility@redhat.com https://listman.redhat.com/mailman/listinfo/crash-utility Contribution Guidelines: https://github.com/crash-utility/crash/wiki
