Quoting Christian Seiler ([email protected]):
> Hi all,
>
> As discussed previously, I've now done a major rewrite of the entire
> cgroup logic. There are now no assumptions made whatsoever when it
> comes to the cgroup mount points, the kernel information will be used
> to determine the proper locations for everything. (Only /proc is
> assumed to be working properly.)
>
> The patch series can also be found at my github under
> <https://github.com/chris-se/lxc/tree/cgroup-major-rewrite>
>
> I ended up almost completely rewriting cgroup.c to make it fit the new
> scheme. For this reason, for the last patch for cgroup.[ch] it's
> probably better to look at the new version and not the diff.
>
> I did test the whole enchilada quite a bit, but I'm very sure that
> there are a lot more bugs in there. What does work:
>
> - lxc-start (and -info, -stop)
> - Choosing $name-1, $name-2, ... as cgroup if $name is already used up
> - lxc-attach
> - lxc-freeze / lxc-unfreeze
> - lxc-stop -k on a frozen container
> - All subsystems mounted together in /sys/fs/cgroup directly
> - All subsystems mounted into different subdirectories beneath
> /sys/fs/cgroup
> - Although I didn't try actual nesting, on the systems with
> subsystems together in /sys/fs/cgroup I did:
> mkdir /sys/fs/cgroup/init /foo
> echo 1 > /sys/fs/cgroup/init/tasks
> mount --bind /sys/fs/cgroup/init /foo
> umount /sys/fs/cgroup
> mount --bind /foo /sys/fs/cgroup
> umount /foo
> And then lxc-start, which worked and correctly put the container
> in the /init/lxc/$name cgroup. This means that even with the current
> mountcgroups hook nesting should work (although as discussed before,
> the current mountcgroups logic breaks other software relying on
> cgroups [1])
>
> Known issues:
>
> - Sometimes cgroup cleanup doesn't work 100%, sometimes cgroups are
> left behind. With the name collision avoidance this isn't a
Thanks, Christian. I did need the trivial white-space-damaged patch below, but
with that it built and ran for me, both with %n and default (/lxc/%n) patterns.
This was in a nested container, I haven't tested at host level but have no
reason to think that would fail if nested worked :)
However I didn't get occasional cgroups left behind - every cgroup was left
behind in my case. I'll take another look. I am to send acks and push
tomorrow.
thanks,
-serge
diff --git a/src/lxc/cgroup.c b/src/lxc/cgroup.c
index 288aa2e..86d89e9 100644
--- a/src/lxc/cgroup.c
+++ b/src/lxc/cgroup.c
@@ -538,7 +538,7 @@ struct cgroup_process_info
*lxc_cgroup_process_info_get_self(struct cgroup_meta_
/* create a new cgroup */
extern struct cgroup_process_info *lxc_cgroup_create(const char *name, const
char *path_pattern, struct cgroup_meta_data *meta_data, const char *sub_pattern)
{
- char **cgroup_path_components;
+ char **cgroup_path_components = NULL;
char **p = NULL;
char *path_so_far = NULL;
char **new_cgroup_paths = NULL;
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