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Re: AMAP_SHARED (was Re: XIP)
A few more comments:
- AMAP_SHARED itself is a fine concept; it's used by shared memory.
452 error = uvm_map(&vm->vm_map, &attach_va, size, uobj, 0,
453 UVM_MAPFLAG(prot, prot, UVM_INH_SHARE,
(Note UVM_INH_SHARE == MAP_INHERIT_SHARE).
I guess MAP_INHERIT_SHARE was added because adding it was easy
after shared amap was implemented for shared memory?
- For highly tuned, XIP'ed systems, programs should be designed to
avoid .data, because they're COW'ed to page cache sooner or later.
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