sandboxed-api/sandboxed_api
Wiktor Garbacz 8a7d0d1cb3 Use a nested userns&mntns to pre-pivot_root
This addresses a latency issue - chroot_fs_refs called inside pivot_root
in the kernel can take several milliseconds on machines with many threads
running.
This might not always reduce latency for custom forkservers, as additional
fork can be more costly than pivot_root.

PiperOrigin-RevId: 281306284
Change-Id: If503ac76a70e5438e94caf708d79cb0219c66def
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