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");
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 ` [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
2019-08-01 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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