From: Peter Zijlstra <peterz@infradead.org>
To: Qais Yousef <qais.yousef@arm.com>
Cc: mingo@kernel.org, linux-kernel@vger.kernel.org,
Geert Uytterhoeven <geert@linux-m68k.org>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH 0/5] Fix FIFO-99 abuse
Date: Fri, 2 Aug 2019 14:41:51 +0200 [thread overview]
Message-ID: <20190802124151.GG2332@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20190802102611.54sae3onftck5fye@e107158-lin.cambridge.arm.com>
On Fri, Aug 02, 2019 at 11:26:12AM +0100, Qais Yousef wrote:
> Yes a somewhat enforced default makes more sense to me. I assume you no longer
> want to put the kthreads that just need to be above OTHER in FIFO-1?
I'm not sure, maybe, there's not that many of them, but possibly we add
another interface for them.
> While at it, since we will cram all kthreads on the same priority, isn't
> a SCHED_RR a better choice now? I think the probability of a clash is pretty
> low, but when it happens, shouldn't we try to guarantee some fairness?
It's never been a problem, and aside from these few straggler threads,
everybody has effectively been there already for years, so if it were a
problem someone would've complained by now.
Also; like said before, the admin had better configure.
Also also, RR-SMP is actually broken (and nobody has cared enough to
bother fixing it).
next prev parent reply other threads:[~2019-08-02 12:42 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-01 11:13 [PATCH 0/5] Fix FIFO-99 abuse Peter Zijlstra
2019-08-01 11:13 ` [PATCH 1/5] sched/pci: Reduce psimon FIFO priority Peter Zijlstra
2019-08-01 17:49 ` Johannes Weiner
2019-08-01 18:31 ` Suren Baghdasaryan
2019-08-01 21:03 ` Suren Baghdasaryan
2019-08-01 21:02 ` Peter Zijlstra
2019-08-01 11:13 ` [PATCH 2/5] rcu/tree: Fix SCHED_FIFO params Peter Zijlstra
2019-08-01 13:51 ` Paul E. McKenney
2019-08-01 14:43 ` Peter Zijlstra
2019-08-01 15:33 ` Paul E. McKenney
2019-08-01 11:13 ` [PATCH 3/5] crypto: Reduce default RT priority Peter Zijlstra
2019-08-09 6:19 ` Herbert Xu
2019-08-01 11:13 ` [PATCH 4/5] media/ivtv: Reduce default FIFO priority Peter Zijlstra
2019-08-01 12:24 ` Andy Walls
2019-08-01 12:38 ` Peter Zijlstra
2019-08-02 8:58 ` Peter Zijlstra
2019-08-07 9:26 ` Hans Verkuil
2019-08-01 11:13 ` [PATCH 5/5] spi: Reduce kthread priority Peter Zijlstra
2019-08-01 11:26 ` Mark Brown
2019-08-01 12:07 ` Peter Zijlstra
2019-08-01 11:27 ` Geert Uytterhoeven
2019-08-01 12:12 ` Peter Zijlstra
2019-08-01 12:16 ` Geert Uytterhoeven
2019-08-01 11:27 ` Enric Balletbo i Serra
2019-08-01 12:17 ` Peter Zijlstra
2019-08-01 12:35 ` Mark Brown
2019-08-01 15:44 ` Doug Anderson
2019-08-02 11:22 ` Applied "spi: Reduce kthread priority" to the spi tree Mark Brown
2019-08-01 13:17 ` [PATCH 0/5] Fix FIFO-99 abuse Qais Yousef
2019-08-02 9:32 ` Peter Zijlstra
2019-08-02 9:50 ` Thomas Gleixner
2019-08-02 10:26 ` Qais Yousef
2019-08-02 12:41 ` Peter Zijlstra [this message]
2019-08-02 14:08 ` Qais Yousef
2019-08-02 14:33 ` Peter Zijlstra
2019-08-02 15:21 ` Qais Yousef
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