Hi... On Mon, Dec 12, 2011 at 01:11, subin gangadharan <[email protected]> wrote: > Hi All, > > I am reading about the barrier from linux kernel development.In this > books, he says > "On SMP kernels they are defined only as usual memory barriers.where > as on UP kernels they are > defined only as a compiler barrier" > > Does this mean in UP, processor won't reorder the instructions ?
In some arch like Alpha, loosely reordering even in UP could happen at any time. But in x86 UP, IIRC there's only strict re-ordering, meaning that every read is always fetching latest write etc. -- regards, Mulyadi Santosa Freelance Linux trainer and consultant blog: the-hydra.blogspot.com training: mulyaditraining.blogspot.com _______________________________________________ Kernelnewbies mailing list [email protected] http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
