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Message-ID: <b4870359-74d5-841b-be99-102d9ec23850@huaweicloud.com>
Date: Mon, 19 Aug 2024 19:13:17 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: Su Yue <l@...enly.org>, Yu Kuai <yukuai1@...weicloud.com>
Cc: mariusz.tkaczyk@...ux.intel.com, hch@...radead.org, song@...nel.org,
linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
yi.zhang@...wei.com, yangerkun@...wei.com, "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH RFC -next v2 00/41] md/md-bitmap: introduce
bitmap_operations and make structure internel
Hi,
在 2024/08/19 16:18, Su Yue 写道:
>
> On Wed 14 Aug 2024 at 15:10, Yu Kuai <yukuai1@...weicloud.com> wrote:
>
>> 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.
>>
> Is the new bitmap in plan?
Yes, I'm working on this now in my spare time, based on this set.
>>
>> 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.
>>
>
> I've looked through the patchset almostly. The changes are quite
> straightforward. IMO, it's good timing to test it and drop RFC in next
> version.
I'm testing now, however, I met some problem that's likely related to
the mdadm tests, not this set. I'll send the formal version soon.
Thansk for the review!
Kuai
>
>> 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(-)
> .
>
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