RFR(M): 8166970: Adapt mutex padding according to DEFAULT_CACHE_LINE_SIZE

[Doerr, Martin]

Hi,

the current implementation of Monitor padding (mutex.cpp) assumes that cache lines are 64 Bytes. There's a platform dependent define "DEFAULT_CACHE_LINE_SIZE" available which can be used. Purpose of padding is to avoid false sharing.

My proposed change is here:
http://cr.openjdk.java.net/~mdoerr/8166970_mutex_padding/webrev.00/

Please review. If will also need a sponsor.

Thanks and best regards,
Martin