linux-kernel - [PATCH RFC -next v2 00/41] md/md-bitmap: introduce bitmap

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Message-Id: <20240814071113.346781-1-yukuai1@huaweicloud.com>
Date: Wed, 14 Aug 2024 15:10:32 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: mariusz.tkaczyk@...ux.intel.com,
	hch@...radead.org,
	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 v2 00/41] md/md-bitmap: introduce bitmap_operations and make structure internel

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

Changes in v2:
 - add patch 1-8 to prevent dereference bitmap directly, and the last
 patch to make bitmap structure internel.
 - use plain function alls "bitmap_ops->xxx()" directly;

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 (41):
  md/raid1: use md_bitmap_wait_behind_writes() in raid1_read_request()
  md/md-bitmap: replace md_bitmap_status() with a new helper
    md_bitmap_get_stats()
  md: use new helper md_bitmap_get_stats() in update_array_info()
  md/md-bitmap: add 'events_cleared' into struct md_bitmap_stats
  md/md-bitmap: add 'sync_size' into struct md_bitmap_stats
  md/md-bitmap: add 'file_pages' into struct md_bitmap_stats
  md/md-bitmap: add 'behind_writes' and 'behind_wait' into struct
    md_bitmap_stats
  md/md-cluster: use helper md_bitmap_get_stats() to get pages in
    resize_bitmaps()
  md/md-bitmap: add a new helper md_bitmap_set_pages()
  md/md-bitmap: introduce struct bitmap_operations
  md/md-bitmap: simplify md_bitmap_create() + md_bitmap_load()
  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: make md_bitmap_print_sb() internal
  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: remove the parameter 'aborted' for md_bitmap_end_sync()
  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 md_bitmap_sync_with_cluster() into
    bitmap_operations
  md/md-bitmap: merge md_bitmap_unplug_async() into md_bitmap_unplug()
  md/md-bitmap: merge bitmap_unplug() into bitmap_operations
  md/md-bitmap: merge md_bitmap_daemon_work() into bitmap_operations
  md/md-bitmap: pass in mddev directly for md_bitmap_resize()
  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 struct
    bitmap_operation.
  md/md-bitmap: merge md_bitmap_set_pages() into struct
    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_enabled() into bitmap_operations
  md/md-bitmap: make in memory structure internal

 drivers/md/dm-raid.c     |   7 +-
 drivers/md/md-bitmap.c   | 561 +++++++++++++++++++++++++++++----------
 drivers/md/md-bitmap.h   | 272 ++++---------------
 drivers/md/md-cluster.c  |  79 +++---
 drivers/md/md.c          | 133 ++++++----
 drivers/md/md.h          |   3 +-
 drivers/md/raid1-10.c    |   9 +-
 drivers/md/raid1.c       |  78 +++---
 drivers/md/raid10.c      |  73 ++---
 drivers/md/raid5-cache.c |   8 +-
 drivers/md/raid5.c       |  62 ++---
 11 files changed, 731 insertions(+), 554 deletions(-)

-- 
2.39.2