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.
