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

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Message-ID: <41077713-8119-4898-8307-731a0d8f346e@huawei.com>
Date: Tue, 26 Aug 2025 16:47:43 +0800
From: Jason Yan <yanaijie@...wei.com>
To: Yihang Li <liyihang9@...artners.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>
Subject: Re: [PATCH 0/4] scsi: hisi_sas: Switch to use tasklet over threaded
 irq handling

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.

> 
>> Bart.
>> .
>>
>