linux-kernel - Re: [PATCH] softirq: let the userside tune the SOFTIRQ_NOW

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Message-ID: <87y1lxzmc1.ffs@tglx>
Date:   Tue, 09 May 2023 15:05:50 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Jason Xing <kerneljasonxing@...il.com>, paulmck@...nel.org,
        peterz@...radead.org, bigeasy@...utronix.de, frederic@...nel.org
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        kerneljasonxing@...il.com, Jason Xing <kernelxing@...cent.com>
Subject: Re: [PATCH] softirq: let the userside tune the SOFTIRQ_NOW_MASK
 with sysctl

On Mon, Apr 10 2023 at 10:30, Jason Xing wrote:
> From: Jason Xing <kernelxing@...cent.com>
>
> Currently we have two exceptions which could avoid ksoftirqd when
> invoking softirqs: HI_SOFTIRQ and TASKLET_SOFTIRQ. They were introduced
> in the commit 3c53776e29f8 ("Mark HI and TASKLET softirq synchronous")
> which says if we don't mask them, it will cause excessive latencies in
> some cases.

As we are ripping this out, I'll ignore this patch.