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SubjectQuestion: How to switch a process namespace by nsfs "device" and inode number directly?
Hi folks,

I am getting stuck by the lack of approach to switch process namespace
by nsfs "device" and inode number in user-space,  for example (mnt:

From my best understanding, the normal way to do that is by setns
system call. But setns only accept fd that refer to a opened namespace,
sometimes we couldn't get it.

For example:  After perf record, perf report couldn't work well once the
process that runs inside a container has exited, as the /proc/pid/ns
doesn't exist anymore after process exit.

Any comments are welcome!



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