[PATCH v1 0/6] Remove rw_page

Minchan Kim
2017-08-08T06:50:18Z

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>

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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