linux-kernel - [PATCH md-6.14 00/13] md/md-bitmap: support to build md-bitmap as kernel module

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Message-Id: <20241225111546.1833250-1-yukuai1@huaweicloud.com>
Date: Wed, 25 Dec 2024 19:15:33 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: xni@...hat.com,
	agk@...hat.com,
	snitzer@...nel.org,
	mpatocka@...hat.com,
	song@...nel.org,
	yukuai3@...wei.com
Cc: dm-devel@...ts.linux.dev,
	linux-raid@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	yukuai1@...weicloud.com,
	yi.zhang@...wei.com,
	yangerkun@...wei.com
Subject: [PATCH md-6.14 00/13] md/md-bitmap: support to build md-bitmap as kernel module

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

Due to known performance issues with md-bitmap and the unreasonable
implementations like following:

 - self-managed pages, bitmap_storage->filemap;
 - self-managed IO submitting like filemap_write_page();
 - global spin_lock
 ...

I have decided not to continue optimizing based on the current bitmap
implementation, and plan to invent a new lock-less bitmap. And build
the bitmap as kernel module is a good way for isolation. However, we
still encourage anyone who wants to continue optimizing the current
implementation, the new bitmap will take some time to be ready.

Yu Kuai (13):
  md/md-bitmap: remove the parameter 'init' for bitmap_ops->resize()
  md/md-bitmap: merge md_bitmap_group into bitmap_operations
  md/md-bitmap: add md_bitmap_registered/enabled() helper
  md/md-bitmap: handle the case bitmap is not enabled before
    start_sync()
  md/md-bitmap: handle the case bitmap is not enabled before end_sync()
  md/dm-raid: check if bitmap is registered in raid_ctr()
  md/raid1: check bitmap before behind write
  md/raid1: check before deferencing mddev->bitmap_ops
  md/raid10: check before deferencing mddev->bitmap_ops
  md/raid5: check before deferencing mddev->bitmap_ops
  md: check before deferencing mddev->bitmap_ops
  md: export some helpers
  md/md-bitmap: support to build md-bitmap as kernel module

 drivers/md/Kconfig      |  18 ++++
 drivers/md/Makefile     |   4 +-
 drivers/md/dm-raid.c    |   5 +-
 drivers/md/md-bitmap.c  |  72 ++++++++--------
 drivers/md/md-bitmap.h  |  54 +++++++++++-
 drivers/md/md-cluster.c |   2 +-
 drivers/md/md.c         | 183 +++++++++++++++++++++++++++++++---------
 drivers/md/md.h         |  12 ++-
 drivers/md/raid1-10.c   |   2 +-
 drivers/md/raid1.c      |  79 ++++++++++-------
 drivers/md/raid10.c     |  48 +++++------
 drivers/md/raid5.c      |  30 ++++---
 12 files changed, 352 insertions(+), 157 deletions(-)

-- 
2.39.2