Commit b5968811 authored Sep 01, 2015 by Riley Andrews Committed by Todd Kjos Jul 13, 2017

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 <tkjos@google.com>
Signed-off-by: Omprakash Dhyade <odhyade@codeaurora.org>

parent 5ab9ecc3

drivers/android/binder.c

+6 −2

Original line number	Diff line number	Diff line
		@@ -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)
		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: