Speeding up GC

[Marc Espie]

In article <20020603180553.A13829@redhat.com> you write:
>
>A better way to do this is to actually compact the GC arena
>and mark the pages read-only.  If the objects are modified,
>the SIGSEGV handler marks the page read-write again and flags
>the page as having been modified.

Isn't that a bit expensive ? getting through a SEGV and a signal-handler
is not especially fast on most OSes.