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Re: [rvm-core] Renaming/aligning methods in org.mmtk.vm.Memory with Harmony?

by Tony Hosking :: Rate this Message:

Hi Ian,

This all seems like window-dressing (pardon the pun) to me. What difference does it make what the operations are called? Every OS will require some sort of adaptation layer to meet the needs of MMTk. To my Unix-blinkered mind the current naming scheme seems intuitive. Or perhaps you are trying to say that there is a deeper problem of mapping the MMTk abstractions to the underlying OS (in other words, I may be missing the point).

Antony Hosking | Associate Professor | Computer Science | Purdue University

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On 2 Mar 2009, at 08:17, Ian Rogers wrote:

Hi,

I'm interested in the interface to underlying OS operations used by MMTk:

dzmmap - demand zero mmap
mprotect - remove read/write protections to a region of memory
munprotect - allow read/write access to a region of memory

the equivalent Harmony interfaces are:

reserve - reserve a region of virtual memory for use
commit - allow access in a region previously reserved
uncommit - remove access to a region

for completeness there is unreserve (but MMTk has no munmap).

MMTk's dzmmap is equivalent to a reserve & commit, mprotect to uncommit, munprotect to commit. The Harmony interface more directly maps to that of Windows. It would make sense to me to push the Harmony naming convention through the RVM interface into MMTk's. I will provide a patch if other people agree.

Ian
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