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Commit 92ee040d authored by Riley Andrews's avatar Riley Andrews Committed by Ruchi Kandoi
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staging: binder: Change binder mutex to rtmutex. 



Surfaceflinger uses binder heavily to receive/send frames from applications
while compositing the screen. Change the binder mutex to an rt mutex to minimize
instances where high priority surfaceflinger binder work is blocked by lower
priority binder ipc.

Signed-off-by: default avatarRiley Andrews <riandrews@google.com>
Change-Id: I086a715267648448f0c5f62b037a3093d1079a79
parent 701112f5

drivers/staging/android/binder.c

+4 −3
Original line number Diff line number Diff line
@@ -26,6 +26,7 @@ 
#include <linux/miscdevice.h>

#include <linux/mm.h>

#include <linux/module.h>

#include <linux/rtmutex.h>

#include <linux/mutex.h>

#include <linux/nsproxy.h>

#include <linux/poll.h>
@@ -42,7 +43,7 @@ 
#include "binder.h"

#include "binder_trace.h"



static DEFINE_MUTEX(binder_main_lock);

static DEFINE_RT_MUTEX(binder_main_lock);

static DEFINE_MUTEX(binder_deferred_lock);

static DEFINE_MUTEX(binder_mmap_lock);
@@ -422,14 +423,14 @@ static long task_close_fd(struct binder_proc *proc, unsigned int fd) 
static inline void binder_lock(const char *tag)

{

	trace_binder_lock(tag);

	mutex_lock(&binder_main_lock);

	rt_mutex_lock(&binder_main_lock);

	trace_binder_locked(tag);

}



static inline void binder_unlock(const char *tag)

{

	trace_binder_unlock(tag);

	mutex_unlock(&binder_main_lock);

	rt_mutex_unlock(&binder_main_lock);

}



static void binder_set_nice(long nice)