linux-kernel - Re: [PATCH md-6.13] md: remove bitmap file support

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Message-ID: <8ae77126-3e26-2c6a-edb6-83d2f1090ebe@huaweicloud.com>
Date: Fri, 8 Nov 2024 14:07:18 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: Dragan Milivojević <galileo@...-inc.com>,
 Song Liu <song@...nel.org>
Cc: Yu Kuai <yukuai1@...weicloud.com>, linux-raid@...r.kernel.org,
 linux-kernel@...r.kernel.org, yi.zhang@...wei.com, yangerkun@...wei.com,
 "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH md-6.13] md: remove bitmap file support

Hi,

在 2024/11/08 13:15, Dragan Milivojević 写道:
> On Fri, 8 Nov 2024 at 02:29, Song Liu <song@...nel.org> wrote:
> 
>> I think we should ship this with 6.14 (not 6.13), so that we have
>> more time testing different combinations of old/new mdadm
>> and kernel. WDYT?
> 
> I'm not sure if bitmap performance fixes are already included
> but if not please include those too. Internal bitmap kills performance
> and external bitmap was a workaround for that issue.

I don't think external bitmap can workaround the performance degradation
problem, because the global lock for the bitmap are the one to blame for
this, it's the same for external or internal bitmap.

Do you know that is there anyone using external bitmap in the real
world? And is there numbers for performance? We'll have to consider
to keep it untill the new lockless bitmap is ready if so.

Thanks,
Kuai

> .
>