linux-kernel - Re: [PATCH] erofs: use HIPRI by default if per-cpu kthreads are enabled

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Message-ID: <3177581a-2252-04a0-1933-fc4cf100046d@linux.alibaba.com>
Date:   Tue, 23 May 2023 09:53:06 +0800
From:   Gao Xiang <hsiangkao@...ux.alibaba.com>
To:     Yue Hu <zbestahu@...il.com>
Cc:     linux-erofs@...ts.ozlabs.org, LKML <linux-kernel@...r.kernel.org>,
        Sandeep Dhavale <dhavale@...gle.com>, huyue2@...lpad.com,
        zhangwen@...lpad.com
Subject: Re: [PATCH] erofs: use HIPRI by default if per-cpu kthreads are
 enabled



On 2023/5/23 17:52, Yue Hu wrote:
> On Mon, 22 May 2023 17:21:41 +0800
> Gao Xiang <hsiangkao@...ux.alibaba.com> wrote:
> 
>> As Sandeep shown [1], high priority RT per-cpu kthreads are
>> typically helpful for Android scenarios to minimize the scheduling
>> latencies.
>>
>> Switch EROFS_FS_PCPU_KTHREAD_HIPRI on by default if
>> EROFS_FS_PCPU_KTHREAD is on since it's the typical use cases for
>> EROFS_FS_PCPU_KTHREAD.
>>
>> Also clean up unneeded sched_set_normal().
>>
>> [1] https://lore.kernel.org/r/CAB=BE-SBtO6vcoyLNA9F-9VaN5R0t3o_Zn+FW8GbO6wyUqFneQ@mail.gmail.com
>> Cc: Sandeep Dhavale <dhavale@...gle.com>
>> Signed-off-by: Gao Xiang <hsiangkao@...ux.alibaba.com>
>> ---
>>   fs/erofs/Kconfig | 1 +
>>   fs/erofs/zdata.c | 2 --
>>   2 files changed, 1 insertion(+), 2 deletions(-)
>>
>> diff --git a/fs/erofs/Kconfig b/fs/erofs/Kconfig
>> index 704fb59577e0..f259d92c9720 100644
>> --- a/fs/erofs/Kconfig
>> +++ b/fs/erofs/Kconfig
>> @@ -121,6 +121,7 @@ config EROFS_FS_PCPU_KTHREAD
>>   config EROFS_FS_PCPU_KTHREAD_HIPRI
>>   	bool "EROFS high priority per-CPU kthread workers"
>>   	depends on EROFS_FS_ZIP && EROFS_FS_PCPU_KTHREAD
>> +	default y
> 
> How about removing this config option?

I tend to leave it as is.

Thanks,
Gao Xiang