linux-kernel - Re: [PATCH RFC v3 06/15] md/raid0: convert raid0_handle_discard() to use bio_submit_split

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Message-ID: <aa6b1a62-787e-4365-aca5-d03c6b94545f@kernel.org>
Date: Mon, 1 Sep 2025 15:37:25 +0900
From: Damien Le Moal <dlemoal@...nel.org>
To: Yu Kuai <yukuai1@...weicloud.com>, hch@...radead.org, colyli@...nel.org,
 hare@...e.de, tieren@...as.com, axboe@...nel.dk, tj@...nel.org,
 josef@...icpanda.com, song@...nel.org, kmo@...erainc.com, satyat@...gle.com,
 ebiggers@...gle.com, neil@...wn.name, akpm@...ux-foundation.org
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
 cgroups@...r.kernel.org, linux-raid@...r.kernel.org, yukuai3@...wei.com,
 yi.zhang@...wei.com, yangerkun@...wei.com, johnny.chenyi@...wei.com
Subject: Re: [PATCH RFC v3 06/15] md/raid0: convert raid0_handle_discard() to
 use bio_submit_split_bioset()

On 9/1/25 12:32 PM, Yu Kuai wrote:
> From: Yu Kuai <yukuai3@...wei.com>
> 
> Unify bio split code, and prepare to fix disordered split IO

Missing the period at the end of the above sentence.

> 
> Noted commit 319ff40a5427 ("md/raid0: Fix performance regression for large
> sequential writes") already fix disordered split IO by converting bio to
> underlying disks before submit_bio_noacct(), with the respect
> md_submit_bio() already split by sectors, and raid0_make_request() will
> split at most once for unaligned IO. This is a bit hacky and we'll convert
> this to solution in general later.

I do not see how this is relevant to this patch. The patch is a simple
straightforward conversion of hard-coded BIO split to using
bio_submit_split_bioset(). So I would just say that.

> Signed-off-by: Yu Kuai <yukuai3@...wei.com>

With the above addressed, this looks OK to me.

Reviewed-by: Damien Le Moal <dlemoal@...nel.org>

-- 
Damien Le Moal
Western Digital Research