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ANDROID: mmc: core: move to a SCHED_FIFO thread

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(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>
This commit is contained in:
Tim Murray 2016-01-19 16:36:40 -08:00 committed by Amit Pundir
parent bc310dc57a
commit 52678eeea3
1 changed files with 7 additions and 0 deletions
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7
drivers/mmc/core/queue.c
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@ -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;