UVM: basic implementation of amap #1072
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* Add missing PAGE_SHIFT definition in vm_param for AArch64 & mips. * Add definition of uvm_amap. * Add interface for uvm_amap. * Add definition of uvm_aref. * Add simple test for uvm_amap. It's based on NetBSD implementation [1] described by Cranor [2]. [1] https://nxr.netbsd.org/xref/src/sys/uvm/uvm_amap.c [2] https://chuck.cranor.org/p/diss.pdf
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What do you think about moving tests into |
I'm not sure. From my point of view amap is a separate structure that can live without rest of UVM. But if you thing that one place for all tests is a better idea you can push that directly here. It's not a a big thing for me. |
Hm... I'm not sure if it's necessary. That functions are private for amap and called only from their locked brothers now. |
| int *am_slot; /* (@) slots of used anons - refers to am_bckptr */ | ||
| int *am_bckptr; /* (@) stack of used anons - refers to am_anon & am_slots */ |
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According to UVM functionality of am_slot and am_backptr should be swapped.
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Closing the PR as requested in #1072 (comment) |
It's a first step for new virtual memory subsystem [1] in Mimiker.
amap describes an area of anonymous memory. It 's a upper layer of UVM’s two-layer mapping scheme.
It's based on NetBSD implementation [2] described by Cranor [3].
[1] #1073
[2] https://nxr.netbsd.org/xref/src/sys/uvm/uvm_amap.c
[3] https://chuck.cranor.org/p/diss.pdf