linux-kernel - Re: [PATCH v3] docs: filesystems: document the squashfs specific mount options

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Date:   Sat, 18 Nov 2023 13:57:41 +0700
From:   Bagas Sanjaya <bagasdotme@...il.com>
To:     Ariel Miculas <amiculas@...co.com>, linux-doc@...r.kernel.org
Cc:     serge@...lyn.com, Phillip Lougher <phillip@...ashfs.org.uk>,
        Jonathan Corbet <corbet@....net>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] docs: filesystems: document the squashfs specific
 mount options

On Fri, Nov 17, 2023 at 06:12:14PM +0200, Ariel Miculas wrote:
> +2.1 Mount options
> +-----------------
> +===================    =========================================================
> +errors=%s              Specify whether squashfs errors trigger a kernel panic
> +                       or not
> +
> +		       ==========  =============================================
> +                         continue  errors don't trigger a panic (default)
> +                            panic  trigger a panic when errors are encountered,
> +                                   similar to several other filesystems (e.g.
> +                                   btrfs, ext4, f2fs, GFS2, jfs, ntfs, ubifs)
> +
> +                                   This allows a kernel dump to be saved,
> +                                   useful for analyzing and debugging the
> +                                   corruption.
> +                       ==========  =============================================
> +threads=%s             Select the decompression mode or the number of threads
> +
> +                       If SQUASHFS_CHOICE_DECOMP_BY_MOUNT is set:
> +
> +		       ==========  =============================================
> +                           single  use single-threaded decompression (default)
> +
> +                                   Only one block (data or metadata) can be
> +                                   decompressed at any one time. This limits
"... at any time ..."?
> +                                   CPU and memory usage to a minimum, but it
> +                                   also gives poor performance on parallel I/O
> +                                   workloads when using multiple CPU machines
> +                                   due to waiting on decompressor availability.
> +                            multi  use up to two parallel decompressors per core
> +
> +                                   If you have a parallel I/O workload and your
> +                                   system has enough memory, using this option
> +                                   may improve overall I/O performance. It
> +                                   dynamically allocates decompressors on a
> +                                   demand basis.
"... on-demand."
> +                           percpu  use a maximum of one decompressor per core
> +
> +                                   It uses percpu variables to ensure
> +                                   decompression is load-balanced across the
> +                                   cores.
> +                        1|2|3|...  configure the number of threads used for
> +                                   decompression
> +
> +                                   The upper limit is num_online_cpus() * 2.
> +                       ==========  =============================================
> +
> +                       If SQUASHFS_CHOICE_DECOMP_BY_MOUNT is **not** set and
> +                       SQUASHFS_DECOMP_MULTI, SQUASHFS_MOUNT_DECOMP_THREADS are
> +                       both set:
> +
> +		       ==========  =============================================
> +                          2|3|...  configure the number of threads used for
> +                                   decompression
> +
> +                                   The upper limit is num_online_cpus() * 2.
> +                       ==========  =============================================
> +
> +===================    =========================================================
> +

Regardless,

Reviewed-by: Bagas Sanjaya <bagasdotme@...il.com>

-- 
An old man doll... just what I always wanted! - Clara

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