From: Qais Yousef <qyousef@layalina.io>
To: John Stultz <jstultz@google.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>,
LKML <linux-kernel@vger.kernel.org>,
Connor O'Brien <connoro@google.com>,
John Dias <joaodias@google.com>, Rick Yiu <rickyiu@google.com>,
John Kacur <jkacur@redhat.com>, Qais Yousef <qais.yousef@arm.com>,
Chris Redpath <chris.redpath@arm.com>,
Abhijeet Dharmapurikar <adharmap@quicinc.com>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Juri Lelli <juri.lelli@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Steven Rostedt <rostedt@goodmis.org>,
Thomas Gleixner <tglx@linutronix.de>,
kernel-team@android.com, "J . Avila" <elavila@google.com>
Subject: Re: [PATCH RFC v4 2/3] sched: Avoid placing RT threads on cores handling long softirqs
Date: Thu, 20 Oct 2022 01:15:01 +0100 [thread overview]
Message-ID: <20221020001501.7qbqd5r4gvw3enjs@airbuntu> (raw)
In-Reply-To: <CANDhNCpQuQn_84yqErF2noAYDwdwNJQF-pr4JKVp1eZzH=+f9w@mail.gmail.com>
On 10/19/22 15:09, John Stultz wrote:
> I fret there are some edge cases where on the target cpu softirqs
> might be pending but ksoftirqd isn't running yet maybe due to a
> lowish-prio rt task - such that the cpu could still be considered a
> good target. But this seems a bit of a stretch.
Could using ksoftirqd_running() instead help with robustness here?
Cheers
--
Qais Yousef
next prev parent reply other threads:[~2022-10-20 0:15 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-03 23:20 [RFC PATCH v4 0/3] Softirq -rt Optimizations John Stultz
2022-10-03 23:20 ` [RFC PATCH v4 1/3] softirq: Add generic accessor to percpu softirq_pending data John Stultz
2022-10-03 23:20 ` [RFC PATCH v4 2/3] sched: Avoid placing RT threads on cores handling long softirqs John Stultz
[not found] ` <20221004013611.1822-1-hdanton@sina.com>
2022-10-04 2:29 ` John Stultz
[not found] ` <20221005002149.1876-1-hdanton@sina.com>
2022-10-05 1:13 ` John Stultz
[not found] ` <20221005060155.1571-1-hdanton@sina.com>
2022-10-10 15:42 ` Qais Yousef
[not found] ` <20221011111846.284-1-hdanton@sina.com>
2022-10-12 14:10 ` Qais Yousef
2022-10-17 12:40 ` [PATCH RFC " Alexander Gordeev
2022-10-18 3:42 ` John Stultz
2022-10-18 3:59 ` John Stultz
2022-10-18 5:32 ` John Stultz
2022-10-19 9:11 ` Alexander Gordeev
2022-10-19 22:09 ` John Stultz
2022-10-20 0:15 ` Qais Yousef [this message]
2022-10-20 12:47 ` Alexander Gordeev
2022-10-22 18:34 ` Joel Fernandes
2022-10-23 7:45 ` Alexander Gordeev
2022-11-15 7:08 ` John Stultz
2022-11-15 12:55 ` Alexander Gordeev
2022-10-19 11:23 ` Qais Yousef
2022-10-22 18:28 ` [RFC PATCH " Joel Fernandes
2022-11-15 21:36 ` John Stultz
2022-10-03 23:20 ` [RFC PATCH v4 3/3] softirq: defer softirq processing to ksoftirqd if CPU is busy with RT John Stultz
2022-10-04 10:45 ` David Laight
2022-10-04 19:19 ` John Stultz
2022-10-10 16:09 ` Qais Yousef
2022-10-17 14:44 ` Qais Yousef
2022-10-18 0:04 ` John Stultz
2022-10-19 11:01 ` Qais Yousef
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