linux-kernel - [PATCH 4/5] media/ivtv: Reduce default FIFO priority

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Message-Id: <20190801111541.858088180@infradead.org>
Date:   Thu, 01 Aug 2019 13:13:52 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     mingo@...nel.org
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org,
        Andy Walls <awalls@...metrocast.net>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH 4/5] media/ivtv: Reduce default FIFO priority

The ivtv driver creates a FIFO-99 thread by default, 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 ivtv work is the
most important work on the machine.

FIFO-1 gets it above all OTHER tasks, which seems high enough lacking
better justification.

Cc: Andy Walls <awalls@...metrocast.net>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: linux-media@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Cc: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 drivers/media/pci/ivtv/ivtv-driver.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/media/pci/ivtv/ivtv-driver.c
+++ b/drivers/media/pci/ivtv/ivtv-driver.c
@@ -738,7 +738,7 @@ static void ivtv_process_options(struct
  */
 static int ivtv_init_struct1(struct ivtv *itv)
 {
-	struct sched_param param = { .sched_priority = 99 };
+	struct sched_param param = { .sched_priority = 1 };
 
 	itv->base_addr = pci_resource_start(itv->pdev, 0);
 	itv->enc_mbox.max_mbox = 2; /* the encoder has 3 mailboxes (0-2) */