linux-kernel - Re: [PATCH v8] bio: limit bio max size

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Date:   Thu, 22 Apr 2021 13:33:10 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Changheun Lee <nanich.lee@...sung.com>, Johannes.Thumshirn@....com,
        asml.silence@...il.com, axboe@...nel.dk, damien.lemoal@....com,
        gregkh@...uxfoundation.org, hch@...radead.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        ming.lei@...hat.com, osandov@...com, patchwork-bot@...nel.org,
        tj@...nel.org, tom.leiming@...il.com
Cc:     jisoo2146.oh@...sung.com, junho89.kim@...sung.com,
        mj0123.lee@...sung.com, seunghwan.hyun@...sung.com,
        sookwan7.kim@...sung.com, woosung2.lee@...sung.com,
        yt0928.kim@...sung.com
Subject: Re: [PATCH v8] bio: limit bio max size

On 4/21/21 2:47 AM, Changheun Lee wrote:
> bio size can grow up to 4GB when muli-page bvec is enabled.
> but sometimes it would lead to inefficient behaviors.
> in case of large chunk direct I/O, - 32MB chunk read in user space -
> all pages for 32MB would be merged to a bio structure if the pages
> physical addresses are contiguous. it makes some delay to submit
> until merge complete. bio max size should be limited to a proper size.

Hi Christoph, Ming and Damien,

Can one of you take a look at this patch?

Thanks,

Bart.