Changes

| crtools || Rollback tree state || medium || - || When we checkpointed process tree with -R option (let them run after checkpoint) we might want to return the tasks into checkpointed state on the same machine. Currently this can only be done by killing the processes and restoring them from scratch. If we could ask CRIU to restore the images ''into'' the ready processes that could speed things up, especially if carefully caring about [[memory changes tracking]].

| crtools || Rollback tree state || medium || - || When we checkpointed process tree with -R option (let them run after checkpoint) we might want to return the tasks into checkpointed state on the same machine. Currently this can only be done by killing the processes and restoring them from scratch. If we could ask CRIU to restore the images ''into'' the ready processes that could speed things up, especially if carefully caring about [[memory changes tracking]].

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| crtools || AIO with pending events || medium || - ||

| crtools || AIO with pending events || medium || - || When we dump AIO ring we check it not to contain events inside and abort the dump otherwise. Need to dump events too and put them back on restore.

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| crtools || Restore arbitrary mountpoints tree || hard || - || -

| crtools || Restore arbitrary mountpoints tree || hard || - || Linux kernel can construct tricky knows with [[mount points]]. We don't support arbitrary configuration of such things, only those that are in active use by software. Need to fix them up.

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| crtools || Lazy migration using userfaultd || medium || xemul || -

| crtools || Lazy migration using userfaultd || medium || xemul || Lazy migration is when we move all the tasks on another node, but leave theirs memory on the source one. Not to allow tasks read garbage from empty address space we protect all of it as inaccessible. When tasks start reading/writing the mem they got page-fault-ed. With the userfaultfd technology it can be possible to intercept the #PF, pull the page from source node and map it into expected address.

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| crtools || Dump tasks from cgroup || easy || - || Currently criu dumps a subtree from given pid

| crtools || Dump tasks from cgroup || easy || - || Currently criu dumps a subtree from given pid