Yes.
> I think, it will be good to allocate a single page-table and share it
> across process than creating 1024 PTE's in all processes sharing it. Is this
> taken care in 2.1.x kernel?
Perhaps it would be good; no it isn't done. It would complicate many
things, to save 4k of memory. And only for >4MB shared mappings at the
same virtual address. These are very rare.
0.1% memory saving in rare cases at great complexity.
In my humble opinion, not worth it.
Shared page tables for fork() may be worth it, but that's a very
different thing (requires COW page tables, complications in the fault
handlers etc.)
-- Jamie
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