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From: Peter Zijlstra <peterz@infradead.org>
To: mingo@kernel.org
Cc: linux-kernel@vger.kernel.org, peterz@infradead.org,
	Benson Leung <bleung@chromium.org>,
	Enric Balletbo i Serra <enric.balletbo@collabora.com>,
	Guenter Roeck <groeck@chromium.org>,
	Mark Brown <broonie@kernel.org>,
	linux-spi@vger.kernel.org
Subject: [PATCH 5/5] spi: Reduce kthread priority
Date: Thu, 01 Aug 2019 13:13:53 +0200	[thread overview]
Message-ID: <20190801111541.917256884@infradead.org> (raw)
In-Reply-To: <20190801111348.530242235@infradead.org>

The SPI thingies request FIFO-99 by default, reduce this to FIFO-50.

FIFO-99 is the very highest priority available to SCHED_FIFO and
it not a suitable default; it would indicate the SPI work is the
most important work on the machine.

Cc: Benson Leung <bleung@chromium.org>
Cc: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Cc: Guenter Roeck <groeck@chromium.org>
Cc: Mark Brown <broonie@kernel.org>
Cc: linux-spi@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
 drivers/platform/chrome/cros_ec_spi.c |    2 +-
 drivers/spi/spi.c                     |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/platform/chrome/cros_ec_spi.c
+++ b/drivers/platform/chrome/cros_ec_spi.c
@@ -706,7 +706,7 @@ static int cros_ec_spi_devm_high_pri_all
 					   struct cros_ec_spi *ec_spi)
 {
 	struct sched_param sched_priority = {
-		.sched_priority = MAX_RT_PRIO - 1,
+		.sched_priority = MAX_RT_PRIO / 2,
 	};
 	int err;
 
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1434,7 +1434,7 @@ static void spi_pump_messages(struct kth
  */
 static void spi_set_thread_rt(struct spi_controller *ctlr)
 {
-	struct sched_param param = { .sched_priority = MAX_RT_PRIO - 1 };
+	struct sched_param param = { .sched_priority = MAX_RT_PRIO / 2 };
 
 	dev_info(&ctlr->dev,
 		"will run message pump with realtime priority\n");



  parent reply	other threads:[~2019-08-01 11:18 UTC|newest]

Thread overview: 37+ 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 ` Peter Zijlstra [this message]
2019-08-01 11:26   ` [PATCH 5/5] spi: Reduce kthread priority 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
2019-08-02 11:22     ` 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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