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android: 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.

Change-Id: If7429040641d6e463f20301ec14f02ecf6b0da36
Signed-off-by: Riley Andrews <riandrews@google.com>
Git-commit: ebce7cd30b3e00232c8be23d0f04d7c0599089b5
Git-repo: https://android.googlesource.com/kernel/common.git
Signed-off-by: Ian Maund <imaund@codeaurora.org>
This commit is contained in:
Riley Andrews 2014-09-26 17:36:36 -07:00 committed by Ian Maund
parent 095bf4084e
commit 7e157bd483
1 changed files with 4 additions and 3 deletions
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7
drivers/android/binder.c
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@ -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>
@ -45,7 +46,7 @@
#include <uapi/linux/android/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);
@ -425,14 +426,14 @@ 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)