From: Peter Zijlstra <peterz@infradead.org>
To: mingo@kernel.org
Cc: linux-kernel@vger.kernel.org, peterz@infradead.org,
Suren Baghdasaryan <surenb@google.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Thomas Gleixner <tglx@linutronix.de>
Subject: [PATCH 1/5] sched/pci: Reduce psimon FIFO priority
Date: Thu, 01 Aug 2019 13:13:49 +0200 [thread overview]
Message-ID: <20190801111541.685367413@infradead.org> (raw)
In-Reply-To: 20190801111348.530242235@infradead.org
PSI defaults to a FIFO-99 thread, reduce this to FIFO-1.
FIFO-99 is the very highest priority available to SCHED_FIFO and
it not a suitable default; it would indicate the psi work is the
most important work on the machine.
Since Real-Time tasks will have pre-allocated memory and locked it in
place, Real-Time tasks do not care about PSI. All it needs is to be
above OTHER.
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
kernel/sched/psi.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/kernel/sched/psi.c
+++ b/kernel/sched/psi.c
@@ -1051,7 +1051,7 @@ struct psi_trigger *psi_trigger_create(s
if (!rcu_access_pointer(group->poll_kworker)) {
struct sched_param param = {
- .sched_priority = MAX_RT_PRIO - 1,
+ .sched_priority = 1,
};
struct kthread_worker *kworker;
next prev parent reply other threads:[~2019-08-01 11:18 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 ` Peter Zijlstra [this message]
2019-08-01 17:49 ` [PATCH 1/5] sched/pci: Reduce psimon FIFO priority 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
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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