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binder: Use wake up hint for synchronous transactions.

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commit 00b40d6133 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@google.com>
Signed-off-by: Omprakash Dhyade <odhyade@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Riley Andrews
2017-06-29 12:01:37 -07:00
committed by Greg Kroah-Hartman
parent 596b97ec2e
commit 1792d6c17c
1 changed files with 6 additions and 2 deletions
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8
drivers/android/binder.c
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@@ -1718,8 +1718,12 @@ 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_get_unused_fd_failed: