On Fri, 1 Jul 2011 00:18:22 +0200 Alexander Graf <ag...@suse.de> wrote:
> > On 01.07.2011, at 00:11, Scott Wood wrote: > > > Almost, but what if we have write permission but not read? > > How would you write back data from a cache line when you haven't read it > earlier? The CPU can read it. The program can't. > > but what about a race with DMA from the I/O thread? > > That'd simply be broken, but I don't quite see how it wouldn't with real > hardware either :). Real hardware doesn't generate a load/store sequence that the program didn't ask for -- where's the breakage? -Scott
