linux-kernel - Re: [PATCH for-6.18/block 04/16] md: fix mssing blktrace bio split events

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Message-ID: <143ea81e-60bf-4bbe-bbe2-579545d84f65@acm.org>
Date: Fri, 5 Sep 2025 13:44:41 -0700
From: Bart Van Assche <bvanassche@....org>
To: Yu Kuai <yukuai1@...weicloud.com>, hch@...radead.org, colyli@...nel.org,
 hare@...e.de, dlemoal@...nel.org, tieren@...as.com, axboe@...nel.dk,
 tj@...nel.org, josef@...icpanda.com, song@...nel.org, yukuai3@...wei.com,
 satyat@...gle.com, ebiggers@...gle.com, kmo@...erainc.com,
 akpm@...ux-foundation.org, neil@...wn.name
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
 cgroups@...r.kernel.org, linux-raid@...r.kernel.org, yi.zhang@...wei.com,
 yangerkun@...wei.com, johnny.chenyi@...wei.com
Subject: Re: [PATCH for-6.18/block 04/16] md: fix mssing blktrace bio split
 events


On 9/5/25 12:06 AM, Yu Kuai wrote:
> If bio is split by internal handling like chunksize or badblocks, the
> corresponding trace_block_split() is missing, resulting in blktrace
> inability to catch BIO split events and making it harder to analyze the
> BIO sequence.

The bio splitting code in block/blk-crypto-fallback.c doesn't call
trace_block_split() either but maybe that code falls outside the scope 
of this patch?

Thanks,

Bart.