[CRIU] [PATCH 0/2] Introduce task_alive() helper

[Pavel Emelyanov]

There are some places in the code where we check for pstree item's
state being ALIVE or STOPPED and not DEAD or HELPER. Let's unify
them.

One thing to fix with this too in the future -- the collecting
stage. Per-pid collections of mm, fds and fs check for respective
image files being present, instead of the item's state. The problem
is that item state is not available yet at this time.

Thanks,
Pavel