linux-kernel - Re: [PATCH v3 3/8] workqueue: Implement BH workqueues to eventually replace tasklets

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Date: Mon, 26 Feb 2024 08:47:07 -1000
From: Tejun Heo <tj@...nel.org>
To: Boqun Feng <boqun.feng@...il.com>
Cc: torvalds@...ux-foundation.org, mpatocka@...hat.com,
	linux-kernel@...r.kernel.org, dm-devel@...ts.linux.dev,
	msnitzer@...hat.com, ignat@...udflare.com, damien.lemoal@....com,
	bob.liu@...cle.com, houtao1@...wei.com, peterz@...radead.org,
	mingo@...nel.org, netdev@...r.kernel.org, allen.lkml@...il.com,
	kernel-team@...a.com, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v3 3/8] workqueue: Implement BH workqueues to eventually
 replace tasklets

Hello,

On Sun, Feb 25, 2024 at 06:00:48PM -0800, Boqun Feng wrote:
> Sorry, late to the party, but I wonder how this play along with cpu
> hotplug? Say we've queued a lot BH_WORK on a CPU, and we offline that
> cpu, wouldn't that end up with a few BH_WORK left on that CPU not being
> executed?

Ah, good point. tasklets get transferred out of offline CPU. Workqueue
counterpart doesn't do that. I'll fix that.

Thanks.

-- 
tejun