binder: update low_latency selection for binder transactions

The change limits the low_latency flag selection to binder
transactions of the foreground high priority tasks.

Change-Id: Id191e63ba2ccf5537cb45711c20bc22831129a18
Signed-off-by: Kishore Sri venkata Ganesh Bolisetty <bsrivenk@codeaurora.org>
[clingutla@codeaurora.org: Resolved trivial merge conflicts]
Signed-off-by: Lingutla Chandrasekhar <clingutla@codeaurora.org>
Signed-off-by: engstk <eng.stk@sapo.pt>

drivers/android/binder.c

@@ -1028,10 +1028,10 @@ static void binder_wakeup_poll_threads_ilocked(struct binder_proc *proc,
 		if (thread->looper & BINDER_LOOPER_STATE_POLL &&
 		    binder_available_for_proc_work_ilocked(thread)) {
 #ifdef CONFIG_SCHED_WALT
-			if (sync && thread->task && thread->task->signal &&
-				(thread->task->signal->oom_score_adj <= 0)) {
+			if (thread->task && current->signal &&
+				(current->signal->oom_score_adj == 0) &&
+				(current->prio < DEFAULT_PRIO))
 				thread->task->low_latency = true;
-			}
 #endif
 			if (sync)
 				wake_up_interruptible_sync(&thread->wait);
@@ -1093,8 +1093,9 @@ static void binder_wakeup_thread_ilocked(struct binder_proc *proc,
 
 	if (thread) {
 #ifdef CONFIG_SCHED_WALT
-		if (sync && thread->task && thread->task->signal &&
-			(thread->task->signal->oom_score_adj <= 0))
+		if (thread->task && current->signal &&
+			(current->signal->oom_score_adj == 0) &&
+			(current->prio < DEFAULT_PRIO))
 			thread->task->low_latency = true;
 #endif
 		if (sync)
@@ -3610,12 +3611,7 @@ static void binder_transaction(struct binder_proc *proc,
 		binder_pop_transaction_ilocked(target_thread, in_reply_to);
 		binder_enqueue_thread_work_ilocked(target_thread, &t->work);
 		binder_inner_proc_unlock(target_proc);
-#ifdef CONFIG_SCHED_WALT
-		if (target_thread->task && target_thread->task->signal &&
-			(target_thread->task->signal->oom_score_adj <= 0)) {
-			target_thread->task->low_latency = true;
-		}
-#endif
+
 		wake_up_interruptible_sync(&target_thread->wait);
 		binder_restore_priority(current, in_reply_to->saved_priority);
 		binder_free_transaction(in_reply_to);