linux-kernel - Re: [PATCH 00/23] md/llbitmap: md/md-llbitmap: introduce a new lockless bitmap

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Message-ID: <5d61b6cc-43a8-fe2f-0d5a-17b167c136f2@huaweicloud.com>
Date: Mon, 30 Jun 2025 14:09:30 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: Xiao Ni <xni@...hat.com>, Yu Kuai <yukuai1@...weicloud.com>
Cc: hch@....de, colyli@...nel.org, song@...nel.org,
 linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-raid@...r.kernel.org, yi.zhang@...wei.com, yangerkun@...wei.com,
 johnny.chenyi@...wei.com, "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH 00/23] md/llbitmap: md/md-llbitmap: introduce a new
 lockless bitmap

Hi,

在 2025/06/30 13:38, Xiao Ni 写道:
>> I don't quite understand, in my case, mdadm -As works fine.
> Sorry for this, I forgot I removed the codes in function llbitmap_state_machine
>          //if (c == BitNeedSync)
>          //  need_resync = true;
Ok.

> The reason I do this: I find if the status table changes like this, it
> doesn't need to check the original status anymore
> -               [BitmapActionReload]            = BitNone,
> +               [BitmapActionReload]            = BitNeedSync,//?

However, we don't want do dirty the bitmap page in this case, as nothing
chagned in the bitmap. And because of this, we have to check the old
value anyway...

Thanks,
Kuai