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From "Ivan Volosyuk" <ivan.volos...@gmail.com>
Subject Re: [DRLVM] GC heap verification infrastructure
Date Tue, 05 Sep 2006 11:37:36 GMT
+1 from me.

> Another (better) approach would be to write a REMSET sanity checker.
> When enabled by a command-line switch it would inject an extra phase
> into the GC phase list (like the existing sanity checker does), and
> before a nursery collection it would:
> - do a full-heap trace, using private side metadata
> - Record all references that point into the nursery
> - when done, check this against the remset and report discrepancies.
> The remset should contain a superset of the references that this sanity
> checker finds.  There's no real reason this couldn't live in MMTk
> permanently.

Well, the checker can be a layer between VM and GC. In C variant of
write barriers it just inject some code before actual GC's write
barrier which does mirroring of slot. When doing the full-heap trace
it can compare slots and its mirrors (even not possessing information
about organization of heap, e.g nurseries).

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