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ANDROID: mmc: 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
This commit is contained in:
Tim Murray
2016-01-19 16:36:40 -08:00
committed by Mark Salyzyn
parent 3d0f8b944b
commit eea999d748
1 changed files with 6 additions and 0 deletions
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6
drivers/mmc/card/queue.c
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@@ -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;