linux-kernel - [PATCH v2 0/7] Replace rw

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Date:   Fri, 11 Aug 2017 14:17:20 +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 v2 0/7] Replace rw_page with on-stack bio

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>

* 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