[Devel] Re: user-cr: Extra unshare() calls ?

[Sukadev Bhattiprolu]

Serge E. Hallyn [serue at us.ibm.com] wrote:
| Quoting Sukadev Bhattiprolu (sukadev at linux.vnet.ibm.com):
| > 
| > Came across this while testing LXC.
| > 
| > 
| > 1. Does ckpt_remount_proc() need to unshare() ? Or can we have the
| >    clone() that calls __ckpt_coordinator() clone with CLONE_NEWNS|CLONE_FS
| >    instead ?
| > 
| >    The problem with the unshare() in ckpt_remount_proc() is that it
| >    creates an extra level in cgroup hierarchy (see below) after restart.
| >    So applications expecting the cgroup hierarchy before chckpoint will
| >    be surprised.
| > 
| > 2. When --mount-pty (or --mntns) is specified, do we need to unshare() 
| >    in the parent process ? Considering only the full-container restart
| >    for now (ignore self-restart and subtree restart), can we just
| >    specify (CLONE_NEWNS|CLONE_FS) at the time of creating the first
| >    restarted process ?
| 
| And then move remounting of devpts into ckpt_remount_proc() called
| from __ckpt_coordinator() as well?

Yes, I missed that in the hack.

Thanks,

Sukadev
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