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

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Message-ID: <2a9e294d-ffcc-906c-12e9-013e87ef7c4d@huawei.com>
Date:   Tue, 13 Sep 2022 10:47:51 +0800
From:   Xiaoming Ni <nixiaoming@...wei.com>
To:     Phillip Lougher <phillip@...ashfs.org.uk>,
        <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 2022/9/9 23:50, Phillip Lougher wrote:
> 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
> 

Thanks for your comment, I'll fix it in the next patch version

>> +    opts->thread_ops = &squashfs_decompressor_multi;
>> +#elif CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU
> 
> this should be
> 
> #elif defined CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU
> 

Thanks for your comment, I'll fix it in the next patch version

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

Thanks
Xiaoming Ni