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skaller wrote:
> BTW: scanning the Lua gc code, it seems to use a naive
> mark/sweep collection algorithm (my Felix collector does too).

Apparently you have looked at Lua 5.0. There is a prerelease version of
Lua 5.1 available at:

Lua 5.1 has a completely revamped incremental and generational GC. The
tri-colour GC algorithm implies use of the state toggling optimization.

> Step (a) can be avoided. We keep a persistent variable
> 'parity' which is 0 or 1. When we allocate an object,
> it gets marked immediately with the inverse of this flag

See g->currentwhite and the otherwhite() macro in lgc.h and lgc.c in Lua 5.1.