Recently, there was a dicussion about removing rw_page due to maintainance burden[1] but the problem was zram because zram has a clear win for the benchmark at that time. The reason why only zram have a win is due to bio allocation wait time from mempool under extreme memory pressure. Christoph Hellwig suggested we can use on-stack-bio for rw_page devices. This patch implements it and replace rw_page operations with on-stack-bio and then finally, remove rw_page interface completely. This patch is based on linux-next-20170804 [1] http://lkml.kernel.org/r/<20170728165604.10455-1-ross.zwisler@xxxxxxxxxxxxxxx> * from v1 * Fix trivial mistake * simplify on-stack bio code - Matthew Minchan Kim (7): zram: set BDI_CAP_STABLE_WRITES once bdi: introduce BDI_CAP_SYNCHRONOUS_IO fs: use on-stack-bio if backing device has BDI_CAP_SYNCHRONOUS capability mm:swap: remove end_swap_bio_write argument mm:swap: use on-stack-bio for BDI_CAP_SYNCHRONOUS device zram: remove zram_rw_page fs: remove rw_page drivers/block/brd.c | 2 + drivers/block/zram/zram_drv.c | 68 +++----------------------------- drivers/nvdimm/btt.c | 3 ++ drivers/nvdimm/pmem.c | 2 + fs/block_dev.c | 76 ------------------------------------ fs/mpage.c | 56 ++++++++++++++++++--------- include/linux/backing-dev.h | 8 ++++ include/linux/blkdev.h | 4 -- include/linux/swap.h | 6 +-- mm/page_io.c | 90 ++++++++++++++++++++++++------------------- mm/swapfile.c | 3 ++ mm/zswap.c | 2 +- 12 files changed, 116 insertions(+), 204 deletions(-) -- 2.7.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
