linux-kernel - Re: [PATCH v3 1/2] squashfs: add the mount parameter theads=<single|multi|percpu>

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Date:   Fri, 9 Sep 2022 16:50:07 +0100
From:   Phillip Lougher <phillip@...ashfs.org.uk>
To:     Xiaoming Ni <nixiaoming@...wei.com>, linux-kernel@...r.kernel.org
Cc:     wangle6@...wei.com, yi.zhang@...wei.com, wangbing6@...wei.com,
        zhongjubin@...wei.com, chenjianguo3@...wei.com
Subject: Re: [PATCH v3 1/2] squashfs: add the mount parameter
 theads=<single|multi|percpu>

On 02/09/2022 10:48, Xiaoming Ni wrote:
> Squashfs supports three decompression concurrency modes:
> 	Single-thread mode: concurrent reads are blocked and the memory overhead
> is small.
> 	Multi-thread mode/percpu mode: reduces concurrent read blocking but
> increases memory overhead.
> 
> The corresponding schema must be fixed at compile time. During mounting,
> the concurrent decompression mode cannot be adjusted based on file read
> blocking.
> 
> The mount parameter theads=<single|multi|percpu> is added to select
> the concurrent decompression mode of a single SquashFS file system
> image.
> 
> Signed-off-by: Xiaoming Ni <nixiaoming@...wei.com>

Additional review comment ...

[SNIP]

> diff --git a/fs/squashfs/super.c b/fs/squashfs/super.c
> index 32565dafa7f3..fd4e70d45f3c 100644
> --- a/fs/squashfs/super.c
> +++ b/fs/squashfs/super.c
> @@ -47,10 +47,12 @@ enum Opt_errors {

[SNIP]

> +#ifdef CONFIG_SQUASHFS_DECOMP_SINGLE
> +	opts->thread_ops = &squashfs_decompressor_single; > +#elif CONFIG_SQUASHFS_DECOMP_MULTI

this should be

#elif defined CONFIG_SQUASHFS_DECOMP_MULTI

> +	opts->thread_ops = &squashfs_decompressor_multi;
> +#elif CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU

this should be

#elif defined CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU

Phillip

> +	opts->thread_ops = &squashfs_decompressor_percpu;
> +#endif
>   	fc->fs_private = opts;
>   	fc->ops = &squashfs_context_ops;
>   	return 0;