On Mon, Aug 14, 2017 at 02:40:59PM +0200, Jan Kara wrote: > Hum, this proposal (and the problems you are trying to deal with) seem very > similar to Peter Zijlstra's mpin() proposal from 2014 [1], just moved to > the DAX area (and so additionally complicated by the fact that filesystems > now have to care). The patch set was not merged due to lack of interest I > think but it looked sensible and the proposed API would make sense for more > stuff than just DAX so maybe it would be better than MAP_DIRECT flag? > > [1] https://lwn.net/Articles/600502/ Thanks for thinking of that. The main sticking point was that I never got it working for RDMA, I got hopelessly lost in that code. Also I feel (and still do) that mpin() would be very useful for CMA, mpin() would be a good moment to migrate/compact the pages and get out of the way.
