linux-kernel - Re: [PATCH] workqueue: Control the frequency of intensive warning through cmdline

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Date: Tue, 20 Feb 2024 19:44:30 -1000
From: Tejun Heo <tj@...nel.org>
To: Xuewen Yan <xuewen.yan94@...il.com>
Cc: Xuewen Yan <xuewen.yan@...soc.com>, jiangshanlai@...il.com,
	corbet@....net, paulmck@...nel.org, rdunlap@...radead.org,
	peterz@...radead.org, yanjiewtw@...il.com,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	ke.wang@...soc.com
Subject: Re: [PATCH] workqueue: Control the frequency of intensive warning
 through cmdline

Hello,

On Wed, Feb 21, 2024 at 10:01:17AM +0800, Xuewen Yan wrote:
>                 cnt = atomic64_inc_return_relaxed(&ent->cnt);
> -               if (cnt >= 4 && is_power_of_2(cnt))
> +               if (cnt == wq_cpu_intensive_warning_nth ||
> +                   (cnt > wq_cpu_intensive_warning_nth && is_power_of_2(cnt)))

If we do this the nth name doesn't really make sense. Maybe something like
wq_cpu_intensive_warning_thresh is better? Also, something like the
following might be more predictable. Let's say
wq_cpu_intensive_warning_thresh of 0 disables the warnings and it's
initialized to 4 by default.

	if (cnt >= wq_cpu_intensive_warning_thresh &&
	    is_power_of_2(cnt + 1 - wq_cpu_intensive_warning_thresh))

Thanks.

-- 
tejun