>From Michal Mertl <mime_at_traveller.cz>, Sun, Jul 30, 2006 at 01:50:36AM +0200: > Michal Mertl wrote: > > Paul Allen wrote: > > > Surely all you need to do is a cheap crit_enter,crit_exit > > > while updating the 64-bit per cpu counters. and on > > > a 64-bit arch you skip the crit_enter,crit_exit. > > > > Critical_enter/exit seem to be quite lightweight (single > > read/modify/write of a variable). > > One more question. Why do you say that crit_* can be avoided on 64-bit > arch? If the reason was that "increment of a 64 bit number is one > operation there" it probably is not true - as somebody already stated, > some instruction sets don't allow atomic increment of a memory location. > > Michal Which FreeBSD tier-I 64b arch do you have in mind... > > _______________________________________________ > freebsd-current_at_freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe_at_freebsd.org"Received on Sat Jul 29 2006 - 22:53:43 UTC
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