[M3commit] CVS Update: cm3
hosking at elego.de
Sat Jun 2 21:15:24 CEST 2007
Changes by: hosking at birch. 07/06/02 21:15:24
cm3/m3-libs/m3core/src/runtime/common/: RT0.i3 RTCollector.m3
Use much more fine-grained read and write barriers:
- read barrier needs only to check that object reference being loaded is not
gray, cleaning just that one object if it is.
- write barrier needs only to check that object is not dirty, marking that one
object if its, and setting the page to dirty as well if it is not already.
These changes pave the way for ultimate deletion of the "protected" page-level
descriptor bit, as well as elimination of all the virtual-memory protection
cruft which is now obsolete. This will make for a much more maintainable and
malleable GC subsystem.
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