D GC theory

[ketmar via Digitalmars-d]

On Tue, 24 Feb 2015 14:45:16 +0000, Marc Schütz wrote:

> It's possible to (ab)use the MMU as a write barrier. Sociomantic's GC
> implementation does this by forking and running the scan in the child,
> then communicating information back about what can be freed. Video:

sure, it's possible sometimes. i'd like to see forking GC in druntime.

but all in all it's just a clever hack. concurrent GC in the same process 
can't be efficiently done with MMU only: MMU protection has too big 
granularity and page faults are too slow.
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