On Mon, 2005-02-07 at 08:44 -0600, Chris Friesen wrote: > Benjamin Herrenschmidt wrote: > >>It turns out that to call ptep_clear_flush_dirty() on ppc64 from a > >>module I needed to export the following symbols: > >> > >>__flush_tlb_pending > >>ppc64_tlb_batch > >>hpte_update > > > > > > Any reason why you need to call that from a module ? Is the module > > GPL'd ? > > I explained this at the beginning of the thread, but I'll do so again. > The module will be released under the GPL. > > The basic idea is that we want to be able to track pages dirtied by a > userspace process. The system has no swap, so we use the dirty bit for > this. On demand we look up the page tables for an address range > specified by the caller, store the addresses of any dirty pages, then > mark them clean so that the next write causes them to get marked dirty > again. It is this act of marking them clean that requires the > additional exports. > > I've included the current code below. If there is any way to accomplish > this without the additional exports, I'd love to hear about it.
Interesting... more than no swap, you must also make sure you have no r/w mmap'ed file (which are technically equivalent to swap). I'm not too fan about exporting those symbols, but I'll talk to paulus, it should be possible at least to EXPORT_SYMBOL_GPL them... Ben. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/