>> In short: Inside kernel, is it possibly to directly copy data from
>> address space of one process to address space of another process ?
> Why do you want to do this?  Usually this is handled by using either
> SysV shared memory, or having both processes mmap the same file.

If the processes have a cooperative common ancestor, you can also mmap
MAP_ANON|MAP_SHARED and inherit the mapping, without needing a file to
back it.

I've long thought that in addition to file descriptors, it should be
possible to send access to pages of memory through AF_LOCAL sockets,
sharing memory between unrelated processes (unrelated in terms of
process parenting and fork-tree, that is).

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