Messages in this thread |  | | From | Minchan Kim <> | Subject | [PATCH v2 0/7] Replace rw_page with on-stack bio | Date | Fri, 11 Aug 2017 14:17:20 +0900 |
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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@linux.intel.com>
* 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
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