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

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Message-ID: <f02e9bb8-3477-4fa7-8b20-72bd518407ed@acm.org>
Date: Fri, 22 Aug 2025 08:17:35 -0700
From: Bart Van Assche <bvanassche@....org>
To: Yihang Li <liyihang9@...artners.com>, martin.petersen@...cle.com,
 James.Bottomley@...senPartnership.com
Cc: linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
 linuxarm@...wei.com, liyihang9@...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

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.

Bart.