Author: Remi Meier <[email protected]> Branch: c8-private-pages Changeset: r1515:be35498ceb30 Date: 2015-01-12 13:35 +0100 http://bitbucket.org/pypy/stmgc/changeset/be35498ceb30/
Log: add short description about how to save memory in the future diff --git a/c8/stm/pages.h b/c8/stm/pages.h --- a/c8/stm/pages.h +++ b/c8/stm/pages.h @@ -6,6 +6,14 @@ Each virtual page is either accessible, or PAGE_NO_ACCESS (and then has no underlying memory). + + TODO: one way to save memory is to re-share pages during major GC. + The pages are mapped MAP_PRIVATE in all segments. We could use an + extra segment that is mapped SHARED to underlying file pages so + we can map PRIVATE pages from segments to it. The idea is that + a major GC first validates all segments (incl. the extra seg.), + then re-maps all PRIVATE, unmodified pages to the SHARED (unmodified) + page. Thus, we get "free" copy-on-write supported by the kernel. */ #define PAGE_FLAG_START END_NURSERY_PAGE _______________________________________________ pypy-commit mailing list [email protected] https://mail.python.org/mailman/listinfo/pypy-commit
