Commit dcdee0d4 authored Jan 19, 2016 by Tim Murray Committed by Mark Salyzyn Feb 22, 2016

ANDROID: mmc: move to a SCHED_FIFO thread



(cherry picked from commit 011e507b413393eab8279dac8b778ad9b6e9971b)

Running mmcqd as a prio 120 thread forces it to compete with standard
user processes for IO performance, especially when the system is under
severe CPU load. Move it to a SCHED_FIFO thread to reduce the impact of
load on IO performance.

Signed-off-by: Tim Murray <timmurray@google.com>
Bug: 25392275
Change-Id: I1edfe73baa25e181367c30c1f40fee886e92b60d

parent b99cd1c3

drivers/mmc/card/queue.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -19,6 +19,7 @@

		#include <linux/mmc/card.h>
		#include <linux/mmc/host.h>
		#include <linux/sched/rt.h>
		#include "queue.h"

		#define MMC_QUEUE_BOUNCESZ 65536
		@@ -50,6 +51,11 @@ static int mmc_queue_thread(void *d)
		{
		struct mmc_queue *mq = d;
		struct request_queue *q = mq->queue;
		struct sched_param scheduler_params = {0};

		scheduler_params.sched_priority = 1;

		sched_setscheduler(current, SCHED_FIFO, &scheduler_params);

		current->flags \|= PF_MEMALLOC;