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msm: sdio_dmux: Pin read workqueue to CPU0

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Pin read workqueue to CPU0 to avoid getting scheduled
on CPU1 which may be running at a lower clock rate
which reduces throughput.

CRs-Fixed: 308115
Signed-off-by: Eric Holmberg <eholmber@codeaurora.org>
This commit is contained in:
Eric Holmberg
2011-09-22 11:08:25 -06:00
committed by Bryan Huntsman
parent bae4ec0ec5
commit 4b1a17e90d
1 changed files with 15 additions and 0 deletions
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15
arch/arm/mach-msm/sdio_dmux.c
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@@ -25,6 +25,8 @@
#include <linux/skbuff.h>
#include <linux/wakelock.h>
#include <linux/debugfs.h>
#include <linux/smp.h>
#include <linux/cpumask.h>
#include <mach/sdio_al.h>
#include <mach/sdio_dmux.h>
@@ -304,6 +306,19 @@ static void sdio_mux_read_data(struct work_struct *work)
void *ptr = 0;
int sz, rc, len = 0;
struct sdio_mux_hdr *hdr;
static int workqueue_pinned;
if (!workqueue_pinned) {
struct cpumask cpus;
cpumask_clear(&cpus);
cpumask_set_cpu(0, &cpus);
if (sched_setaffinity(current->pid, &cpus))
pr_err("%s: sdio_dmux set CPU affinity failed\n",
__func__);
workqueue_pinned = 1;
}
DBG("%s: reading\n", __func__);
/* should probably have a separate read lock */