On Thu, May 07, 2015 at 01:08:23AM +0800, Ming Lei wrote: > When direct IO is submitted from kernel, it is often unnecessary > to dirty pages, for example of loop, dirtying pages have been > considered in the upper filesystem(over loop) side already, and > they don't need to be dirtied again. > > So this patch introduces IOCB_DONT_DIRTY_PAGE flag for direct IO, > and other ITER_BVEC and ITER_KVEC cases might benefit from it too. > > The patch is based on previous Dave's patch.
in-kernel I/O should never dirty the pages written to or read from, so just checking the iov_iter type should be enough. -- 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/
