On 11/29/2013 12:35 PM, Oleg Nesterov wrote: > On 11/29, H. Peter Anvin wrote: >> >> On 11/29/2013 12:05 PM, Oleg Nesterov wrote: >>> >>> Can't we invalidate pte (so that any user will stuck in page fault), >>> update the page(s), restore the pte and drop the locks? >> >> That would require a global TLB shootdown > > Well, it is not really global, it is for mm_cpumask() and for good > reason? > > And is it really worse than on_each_cpu(do_sync_core) and the usage > of text_mutex? >
Probably not, but one would have to consider the total amount of synchronization needed. >> (and wouldn't help >> shared-memory code segments, if we care about that at all.) > > Well, I think this should only support the private mappings. > Well, what do you do if someone tries this on a MAP_SHARED mapping? Error out? -hpa -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/