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Yunus Shaikh
aa2b7ce7ef
A heap mirror whose range had left the write watch was dropped and its
range planned again. When the host import budget refused the range, that
plan was a per-build copy, and past APS5_ADDRESS_COPY_MAX_MIB (64 MiB) the
copy stopped the process ("an address-based build copies ... past ..."),
where refreshing the mirror in full would have carried on.
Plan such a range again only when the import path takes it now. A cached
address space whose heap or sparse mirror has left the watch is rebuilt
only if importing the mirror's range succeeds, and the rebuild then finds
that import; otherwise the space is kept and the mirror refreshed in full,
every block counted as written. A build that plans its ranges tries the
import first, so acquireMirror keeps the existing mirror of a range that
reaches it, and a sparse mirror whose pieces are unwatched is refreshed in
full instead of planned again.
SetAddressCopyLimit sets the copy cap in-process, as SetHostImportBudget
sets the budget. The heap and sparse unwatch tests set it below the heap
the old plan would copy: the refused heap's mirror is kept and refreshed in
full (its unwatched block and a watched block the CPU wrote both reach it),
and once the budget holds the heap the next build imports it and releases
the mirror.