linux-kernel - Re: [PATCH] delayacct/sched: add SOFTIRQ delay

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Message-ID: <20250819101411.GG4067720@noisy.programming.kicks-ass.net>
Date: Tue, 19 Aug 2025 12:14:11 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: akpm@...ux-foundation.org, wang.yaxin@....com.cn, fan.yu9@....com.cn,
	corbet@....net, bsingharora@...il.com, yang.yang29@....com.cn,
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Subject: Re: [PATCH] delayacct/sched: add SOFTIRQ delay

On Tue, Aug 19, 2025 at 05:27:39PM +0800, Tio Zhang wrote:
> Intro SOFTIRQ delay, so we can separate softirq as SOFTIRQ delay
> and hardirq as {IRQ - SOFTIRQ} delay.
> 
> A typical scenario is when tasks delayed by network,
> if they delayed by rx net packets, i.e, net_rx_action(),
> SOFTIRQ delay is almost same as IRQ delay;
> if they delayed by, e.g, bad driver or broken hardware,
> SOFTIRQ delay is almost 0 while IRQ delay remains big.
> 
> Examples tool usage could be found in
> Documentation/accounting/delay-accounting.rst

accounting will be the death of us :/

How do you account ksoftirqd ?