Commit 52678eee authored Jan 19, 2016 by Tim Murray Committed by Amit Pundir Dec 18, 2017

ANDROID: mmc: core: 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

[AmitP: Include <uapi/linux/sched/types.h> for struct sched_param]
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>

parent bc310dc5

drivers/mmc/core/queue.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -17,6 +17,8 @@

		#include <linux/mmc/card.h>
		#include <linux/mmc/host.h>
		#include <linux/sched/rt.h>
		#include <uapi/linux/sched/types.h>

		#include "queue.h"
		#include "block.h"
		@@ -43,6 +45,11 @@ static int mmc_queue_thread(void *d)
		struct mmc_queue *mq = d;
		struct request_queue *q = mq->queue;
		struct mmc_context_info *cntx = &mq->card->host->context_info;
		struct sched_param scheduler_params = {0};

		scheduler_params.sched_priority = 1;

		sched_setscheduler(current, SCHED_FIFO, &scheduler_params);

		current->flags \|= PF_MEMALLOC;