KAMEZAWA Hiroyuki wrote: > On Thu, 05 Jul 2007 13:19:41 +1000 > Nick Piggin <nickpiggin@yahoo.com.au> wrote: > > >>>>From what I can work out, it is something like "at this point the page >>>>should be uptodate, so at least the icache won't contain *inconsistent* >>>>data, just old data which userspace should take care of flushing if it >>>>modifies". Is that always true? >>> >>> >>>I think it's true. But, in this case, i-cache doesn't contain *incositent* data. >>>There are inconsistency between L2-Dcache and L3-mixed-cache. At L2-icache-miss, >>>a cpu fetches data from L3 cache. >>>This case seems defficult to be generalized... >> >>If there is something in the icache line that isn't the last data to >>be stored at that address, isn't that inconsistent? >> > > Hmm..do we have a chance to add do_flush_cache_if_not_filled_by_dma(page) > before SetPageUptodate(page) ? Well you shouldn't strictly need to, because only uptodate pages should ever be mapped with set_pte, and if you do the flush_icache before the set_pte, then you effectively get the same result. And if that's the result you want, then I don't think the flush_icache before set_pte is a *terrible* way to get it. -- SUSE Labs, Novell Inc. - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.htmlReceived on Thu Jul 05 14:30:32 2007
This archive was generated by hypermail 2.1.8 : 2007-07-05 14:30:48 EST