From b5968811a7c6aeada9d8ff7a2b84b56020088c8c Mon Sep 17 00:00:00 2001 From: Riley Andrews Date: Tue, 1 Sep 2015 12:42:07 -0700 Subject: [PATCH] FROMLIST: binder: Use wake up hint for synchronous transactions. (from https://patchwork.kernel.org/patch/9817747) 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. Change-Id: I041dd798f3d0c4c15aa461e4e6d71dc270e1ca86 Signed-off-by: Todd Kjos Signed-off-by: Omprakash Dhyade --- drivers/android/binder.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/android/binder.c b/drivers/android/binder.c index 9105f416ce46..9ff1d15f7c31 100644 --- a/drivers/android/binder.c +++ b/drivers/android/binder.c @@ -2200,8 +2200,12 @@ static void binder_transaction(struct binder_proc *proc, 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_translate_failed: -- 2.20.1