linux-kernel - Re: [RFC PATCH 2/7] RDMA/rxe: Convert the triple tasklets to workqueues

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Message-ID: <fd1d7c49-a090-e8c7-415b-dfcda94ace9d@acm.org>
Date:   Sun, 11 Sep 2022 08:08:58 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Yanjun Zhu <yanjun.zhu@...ux.dev>,
        Daisuke Matsuda <matsuda-daisuke@...itsu.com>,
        linux-rdma@...r.kernel.org, leonro@...dia.com, jgg@...dia.com,
        zyjzyj2000@...il.com
Cc:     nvdimm@...ts.linux.dev, linux-kernel@...r.kernel.org,
        rpearsonhpe@...il.com, yangx.jy@...itsu.com, lizhijian@...itsu.com,
        y-goto@...itsu.com
Subject: Re: [RFC PATCH 2/7] RDMA/rxe: Convert the triple tasklets to
 workqueues

On 9/11/22 00:10, Yanjun Zhu wrote:
> I also implemented a workqueue for rxe. IMO, can we add a variable to
> decide to use tasklet or workqueue?
> 
> If user prefer using tasklet, he can set the variable to use
> tasklet. And the default is tasklet. Set the variable to another
> value to use workqueue.

I'm in favor of removing all uses of the tasklet mechanism because of 
the disadvantages of that mechanism. See also:
* "Eliminating tasklets" (https://lwn.net/Articles/239633/).
* "Modernizing the tasklet API" (https://lwn.net/Articles/830964/).
* Sebastian Andrzej Siewior's opinion about tasklets 
(https://lore.kernel.org/all/YvovfXMJQAUBsvBZ@linutronix.de/).

Thanks,

Bart.