linux-kernel - Re: [PATCH 09/23] md/md-bitmap: add a new method blocks_synced() in bitmap

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Message-ID: <2559061d-7c99-46c9-8274-9e60f59b4904@suse.de>
Date: Tue, 27 May 2025 08:16:12 +0200
From: Hannes Reinecke <hare@...e.de>
To: Yu Kuai <yukuai1@...weicloud.com>, hch@....de, xni@...hat.com,
 colyli@...nel.org, song@...nel.org, yukuai3@...wei.com
Cc: 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
Subject: Re: [PATCH 09/23] md/md-bitmap: add a new method blocks_synced() in
 bitmap_operations

On 5/24/25 08:13, Yu Kuai wrote:
> From: Yu Kuai <yukuai3@...wei.com>
> 
> Currently, raid456 must perform a whole array initial recovery to build
> initail xor data, then IO to the array won't have to read all the blocks
> in underlying disks.
> 
> This behavior will affect IO performance a lot, and nowadays there are
> huge disks and the initial recovery can take a long time. Hence llbitmap
> will support lazy initial recovery in following patches. This method is
> used to check if data blocks is synced or not, if not then IO will still
> have to read all blocks for raid456.
> 
> Signed-off-by: Yu Kuai <yukuai3@...wei.com>
> Reviewed-by: Christoph Hellwig <hch@....de>
> ---
>   drivers/md/md-bitmap.h | 1 +
>   drivers/md/raid5.c     | 6 ++++++
>   2 files changed, 7 insertions(+)
> 
Reviewed-by: Hannes Reinecke <hare@...e.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                  Kernel Storage Architect
hare@...e.de                                +49 911 74053 688
SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg
HRB 36809 (AG Nürnberg), GF: I. Totev, A. McDonald, W. Knoblich