If you want to go in that direction, it would probably be a good idea to add a
way to register a blow_caches() function, so that apps get a chance to shrink
application-level caches at the same time.

I'd like g_malloc to be a bit smarter that standard malloc: do its best before
crashing. What about g_try_malloc/g_try_realloc : should they also try to
release some memory before returning NULL ?

Registering blow_cache() functions sounds good, but i don't know whether or not
user should be able to manually blow_all_registred_caches().

Created attachment 38418 [details] [review]
proposed patch

simple patch without the ability to register cleanup functions.

We should probably wait for the outcome of the discussion in bug 118439 before
doing anything here. Maybe blow_chunks() will be irrelevant after that...

closing out some old bugs