[QUESTION] Filesystem like structure in RAM w/o using filesystem (not ramdisk)

Hello!

As I have understood the accessing ramdisk goes through the same kernel path which is meant for accessing slow block device (i_nodes caching etc.). Is there any other common way (some API above shared memory?) to create/open/read/write globally accessible hierarchical datablocks in RAM?

Could it be possibly faster than ramdisk?

Thanks in advance,
Indrek

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