linux-kernel - Re: [PATCH v3 5/5] md/raid10: convert resync

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Date:   Fri, 16 Sep 2022 12:37:57 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Yu Kuai <yukuai1@...weicloud.com>, song@...nel.org,
        guoqing.jiang@...ux.dev, pmenzel@...gen.mpg.de
Cc:     linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
        yukuai3@...wei.com, yi.zhang@...wei.com
Subject: Re: [PATCH v3 5/5] md/raid10: convert resync_lock to use seqlock



On 2022-09-16 05:34, Yu Kuai wrote:
> From: Yu Kuai <yukuai3@...wei.com>
> 
> Currently, wait_barrier() will hold 'resync_lock' to read 'conf->barrier',
> and io can't be dispatched until 'barrier' is dropped.
> 
> Since holding the 'barrier' is not common, convert 'resync_lock' to use
> seqlock so that holding lock can be avoided in fast path.
> 
> Signed-off-by: Yu Kuai <yukuai3@...wei.com>

Reviewed-and-Tested-by: Logan Gunthorpe <logang@...tatee.com>

So far, I've run this series 3 times through the mdadm test suite and
haven't detected any issues.

Thanks,

Logan