linux-kernel - [PATCH RFC -next 00/26] md/md-bitmap: introduce bitmap

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Message-Id: <20240810020854.797814-1-yukuai1@huaweicloud.com>
Date: Sat, 10 Aug 2024 10:08:28 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: song@...nel.org
Cc: linux-kernel@...r.kernel.org,
	linux-raid@...r.kernel.org,
	yukuai3@...wei.com,
	yukuai1@...weicloud.com,
	yi.zhang@...wei.com,
	yangerkun@...wei.com
Subject: [PATCH RFC -next 00/26] md/md-bitmap: introduce bitmap_operations

From: Yu Kuai <yukuai3@...wei.com>

The background is that currently bitmap is using a global spin_lock,
cauing lock contention and huge IO performance degration for all raid
levels.

However, it's impossible to implement a new lock free bitmap with
current situation that md-bitmap exposes the internal implementation
with lots of exported apis. Hence bitmap_operations is invented, to
describe bitmap core implementation, and a new bitmap can be introduced
with a new bitmap_operations, we only need to switch to the new one
during initialization.

And with this we can build bitmap as kernel module, but that's not
our concern for now.

Noted I just compile this patchset, not tested yet.

Yu Kuai (26):
  md/md-bitmap: introduce struct bitmap_operations
  md/md-bitmap: merge md_bitmap_create() into bitmap_operations
  md/md-bitmap: merge md_bitmap_load() into bitmap_operations
  md/md-bitmap: merge md_bitmap_destroy() into bitmap_operations
  md/md-bitmap: merge md_bitmap_flush() into bitmap_operations
  md/md-bitmap: don't expose md_bitmap_print_sb()
  md/md-bitmap: merge md_bitmap_update_sb() into bitmap_operations
  md/md-bitmap: merge md_bitmap_status() into bitmap_operations
  md/md-bitmap: remove md_bitmap_setallbits()
  md/md-bitmap: merge bitmap_write_all() into bitmap_operations
  md/md-bitmap: merge md_bitmap_dirty_bits() into bitmap_operations
  md/md-bitmap: merge md_bitmap_startwrite() into bitmap_operations
  md/md-bitmap: merge md_bitmap_endwrite() into bitmap_operations
  md/md-bitmap: merge md_bitmap_start_sync() into bitmap_operations
  md/md-bitmap: merge md_bitmap_end_sync() into bitmap_operations
  md/md-bitmap: merge md_bitmap_close_sync() into bitmap_operations
  md/md-bitmap: mrege md_bitmap_cond_end_sync() into bitmap_operations
  md/md-bitmap: merge bitmap_sync_with_cluster() into bitmap_operations
  md/md-bitmap: merge md_bitmap_resize() into bitmap_operations
  md/md-bitmap: merge get_bitmap_from_slot() into bitmap_operations
  md/md-bitmap: merge md_bitmap_copy_from_slot() into bitmap_operations
  md/md-bitmap: merge md_bitmap_free() into bitmap_operations
  md/md-bitmap: merge md_bitmap_wait_behind_writes() into
    bitmap_operations
  md/md-bitmap: merge md_bitmap_daemon_work() into bitmap_operations
  md/md-bitmap: merge md_bitmap_unplug() and md_bitmap_unplug_async()
  md/md-bitmap: merge bitmap_unplug() into bitmap_operations

 drivers/md/dm-raid.c     |   2 +-
 drivers/md/md-bitmap.c   | 216 +++++++++++++++++---------------
 drivers/md/md-bitmap.h   | 259 ++++++++++++++++++++++++++++++++++-----
 drivers/md/md-cluster.c  |  21 ++--
 drivers/md/md.c          |  13 +-
 drivers/md/md.h          |   1 +
 drivers/md/raid1-10.c    |   7 +-
 drivers/md/raid1.c       |  22 ++--
 drivers/md/raid10.c      |  32 +++--
 drivers/md/raid5-cache.c |   2 +-
 drivers/md/raid5.c       |  25 ++--
 11 files changed, 401 insertions(+), 199 deletions(-)

-- 
2.39.2