add a check and flush to ensure that the 3m GC doesn't cache too many idle pages
add a check and flush to ensure that the 3m GC doesn't cache too many idle pages

svn: r6048

mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket