On Mon, Jul 31, 2017 at 09:17:07AM +0200, Christoph Hellwig wrote: > On Mon, Jul 31, 2017 at 07:16:59AM +0900, Minchan Kim wrote: > > rw_page's gain is reducing of dynamic allocation in swap path > > as well as performance gain thorugh avoiding bio allocation. > > And it would be important in memory pressure situation. > > There is no need for any dynamic allocation when using the bio > path. Take a look at __blkdev_direct_IO_simple for an example > that doesn't do any allocations.
Do you suggest define something special flag(e.g., SWP_INMEMORY) for in-memory swap to swap_info_struct when swapon time manually or from bdi_queue_someting automatically? And depending the flag of swap_info_struct, use the onstack bio instead of dynamic allocation if the swap device is in-memory? _______________________________________________ Linux-nvdimm mailing list Linux-nvdimm@lists.01.org https://lists.01.org/mailman/listinfo/linux-nvdimm
