This is a note to let you know that I've just added the patch titled
binder: Use wake up hint for synchronous transactions.
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
binder-use-wake-up-hint-for-synchronous-transactions.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 00b40d613352c623aaae88a44e5ded7c912909d7 Mon Sep 17 00:00:00 2001
From: Riley Andrews <riandrews@xxxxxxxxxx>
Date: Thu, 29 Jun 2017 12:01:37 -0700
Subject: binder: Use wake up hint for synchronous transactions.
From: Riley Andrews <riandrews@xxxxxxxxxx>
commit 00b40d613352c623aaae88a44e5ded7c912909d7 upstream.
Use wake_up_interruptible_sync() to hint to the scheduler binder
transactions are synchronous wakeups. Disable preemption while waking
to avoid ping-ponging on the binder lock.
Signed-off-by: Todd Kjos <tkjos@xxxxxxxxxx>
Signed-off-by: Omprakash Dhyade <odhyade@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/android/binder.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -1724,8 +1724,12 @@ static void binder_transaction(struct bi
list_add_tail(&t->work.entry, target_list);
tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
list_add_tail(&tcomplete->entry, &thread->todo);
- if (target_wait)
- wake_up_interruptible(target_wait);
+ if (target_wait) {
+ if (reply || !(t->flags & TF_ONE_WAY))
+ wake_up_interruptible_sync(target_wait);
+ else
+ wake_up_interruptible(target_wait);
+ }
return;
err_get_unused_fd_failed:
Patches currently in stable-queue which might be from riandrews@xxxxxxxxxx are
queue-4.9/binder-use-wake-up-hint-for-synchronous-transactions.patch