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Date: Tue, 8 Aug 2017 15:50:18 +0900 From: Minchan Kim <minchan@...nel.org> To: Andrew Morton <akpm@...ux-foundation.org> Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org, Ross Zwisler <ross.zwisler@...ux.intel.com>, "karam . lee" <karam.lee@....com>, seungho1.park@....com, Matthew Wilcox <willy@...radead.org>, Christoph Hellwig <hch@....de>, Dan Williams <dan.j.williams@...el.com>, Dave Chinner <david@...morbit.com>, jack@...e.cz, Jens Axboe <axboe@...nel.dk>, Vishal Verma <vishal.l.verma@...el.com>, linux-nvdimm@...ts.01.org, kernel-team <kernel-team@....com>, Minchan Kim <minchan@...nel.org> Subject: [PATCH v1 0/6] Remove rw_page 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@...ux.intel.com> Minchan Kim (6): bdi: introduce BDI_CAP_SYNC fs: use on-stack-bio if backing device has BDI_CAP_SYNC capability mm:swap: remove end_swap_bio_write argument mm:swap: use on-stack-bio for BDI_CAP_SYNC devices zram: remove zram_rw_page fs: remove rw_page drivers/block/brd.c | 2 + drivers/block/zram/zram_drv.c | 54 +--------------- drivers/nvdimm/btt.c | 2 + drivers/nvdimm/pmem.c | 2 + fs/block_dev.c | 76 ---------------------- fs/mpage.c | 45 +++++++++++-- include/linux/backing-dev.h | 7 ++ include/linux/blkdev.h | 4 -- include/linux/swap.h | 6 +- mm/page_io.c | 145 +++++++++++++++++++++++++----------------- mm/swapfile.c | 3 + mm/zswap.c | 2 +- 12 files changed, 147 insertions(+), 201 deletions(-) -- 2.7.4
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