linux-kernel - Re: [RFC/RFT PATCH 1/2] sched/core: Check and schedule ksoftirq

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Message-ID: <Y5xURk3CkzhIjmmq@hirez.programming.kicks-ass.net>
Date:   Fri, 16 Dec 2022 12:19:34 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Cc:     rafael@...nel.org, frederic@...nel.org, daniel.lezcano@...aro.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        len.brown@...el.com
Subject: Re: [RFC/RFT PATCH 1/2] sched/core: Check and schedule ksoftirq

On Thu, Dec 15, 2022 at 10:42:59AM -0800, Srinivas Pandruvada wrote:
> +		/* Give ksoftirqd 1 jiffy to get a chance to start its job */
> +		if (!READ_ONCE(it.done) && task_is_running(__this_cpu_read(ksoftirqd))) {
> +			__set_current_state(TASK_UNINTERRUPTIBLE);
> +			schedule_timeout(1);
> +		}

That's absolutely disgusting :-/