linux-kernel - Re: [PATCH 0/4] scsi: hisi_sas: Switch to use tasklet over threaded irq handling

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Message-ID: <58f31c71-1d70-e763-45b4-66b4778ba028@h-partners.com>
Date: Wed, 27 Aug 2025 10:14:56 +0800
From: Yihang Li <liyihang9@...artners.com>
To: Jason Yan <yanaijie@...wei.com>, Bart Van Assche <bvanassche@....org>,
	<martin.petersen@...cle.com>, <James.Bottomley@...senPartnership.com>
CC: <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linuxarm@...wei.com>, <liuyonglong@...wei.com>, <prime.zeng@...ilicon.com>,
	Yihang Li <liyihang9@...artners.com>
Subject: Re: [PATCH 0/4] scsi: hisi_sas: Switch to use tasklet over threaded
 irq handling

Hi, Jason

On 2025/8/26 16:47, Jason Yan wrote:
> 在 2025/8/25 9:42, Yihang Li 写道:
>> Hi Bart,
>>
>> On 2025/8/22 23:17, Bart Van Assche wrote:
>>> On 8/22/25 12:59 AM, Yihang Li wrote:
>>>> We found that when the CPU handling the interrupt thread is occupied by
>>>> other high-priority processes, the interrupt thread will not be scheduled.
>>>> So there is a change to switch the driver to use tasklet over threaded
>>>> interrupt handling.
>>> Tasklets have severe disadvantages and hence their removal has been
>>> proposed several times. See e.g. https://lwn.net/Articles/960041/.
>>> There must be a better solution than switching to tasklets.
>>>
>>
>> Thanks you for your reply. I will consider some other solution.
>> Additionally, do you have any good suggestions?
> 
> It seems the official replacement of tasklets is WQ_BH. However there are very few users now. I'm not sure if the stability and performance can meet our requirements.
> 

Yes, so I will first attempt to modify it using WQ_BH,
and after thorough testing and verification,
I will report the solution to everyone.

Thanks,

Yihang.