2022-04-14 10:20 (UTC+0200), Antonio Di Bacco: [...] > Ok, after having a look to memif I managed to exchange the fd between the > two processes and it works. > Anyway the procedure seems a little bit clunky and I think I'm going to use > the new SYSCALL pidfd_getfd > to achieve the same result. In your opinion this method (getfd_pidfd) > could also work if the two DPDK processes > are inside different docker containers?
Honestly, I've just learned about pidfd_getfd() from you. But I know that containers use PID namespaces, so there's a question how you will obtain the pidfd of a process in another container. In general, any method of sharing FD will work. Remember that you also need offset and size. Given that some channel is required to share those, I think Unix domain socket is still the preferred way. > Or is there another mechanims like using handles to hugepages present in > the filesystem to share between two > different containers? FD is needed for mmap(). You need to either pass the FD or open() the same hugepage file by path. I advise against using paths because they are not a part of DPDK API contract.
