linux-kernel - Re: [PATCH 0/3] Implement readahead for squashfs

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Date:   Mon, 16 May 2022 18:47:02 +0800
From:   Hsin-Yi Wang <hsinyi@...omium.org>
To:     Phillip Lougher <phillip@...ashfs.org.uk>,
        Matthew Wilcox <willy@...radead.org>,
        Xiongwei Song <Xiongwei.Song@...driver.com>
Cc:     Zheng Liang <zhengliang6@...wei.com>,
        Zhang Yi <yi.zhang@...wei.com>, Hou Tao <houtao1@...wei.com>,
        Miao Xie <miaoxie@...wei.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "linux-mm @ kvack . org" <linux-mm@...ck.org>,
        "squashfs-devel @ lists . sourceforge . net" 
        <squashfs-devel@...ts.sourceforge.net>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] Implement readahead for squashfs

On Mon, May 16, 2022 at 6:42 PM Hsin-Yi Wang <hsinyi@...omium.org> wrote:
>
> Commit c1f6925e1091("mm: put readahead pages in cache earlier") requires
> fs to implement readahead callback. Otherwise there will be a
> performance regression.
>
> Commit 9eec1d897139("squashfs: provide backing_dev_info in order to
> disable read-ahead") mitigates the performance drop issue for squashfs
> by closing readahead for it.
>
> This series implements readahead callback for squashfs. The previous
> discussion are in [1] and [2].
>
> [1] https://lore.kernel.org/all/CAJMQK-g9G6KQmH-V=BRGX0swZji9Wxe_2c7ht-MMAapdFy2pXw@mail.gmail.com/T/
> [2] https://lore.kernel.org/linux-mm/Yn5Yij9pRPCzDozt@casper.infradead.org/t/#m4af4473b94f98a4996cb11756b633a07e5e059d1
>
> Hsin-Yi Wang (3):
>   Revert "squashfs: Convert squashfs to read_folio"
>   Revert "squashfs: provide backing_dev_info in order to disable
>     read-ahead"
>   squashfs: implement readahead
>
>  fs/squashfs/file.c    | 82 +++++++++++++++++++++++++++++++++++++++++--
>  fs/squashfs/super.c   | 33 -----------------
>  fs/squashfs/symlink.c |  5 ++-
>  3 files changed, 81 insertions(+), 39 deletions(-)
>
> --
> 2.36.0.550.gb090851708-goog
>

hi, please ignore this for now. I'll resend a correct cover letter.