evie/android_kernel_oneplus_msm8998
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android: binder: Use wake up hint for synchronous transactions.

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Use wake_up_interruptible_sync() to hint to the scheduler binder
transactions are synchronous wakeups. Disable premption while waking
to avoid ping-ponging on the binder lock.

Change-Id: Ic406a232d0873662f80148e37acefe5243d912a0
Signed-off-by: Todd Kjos <tkjos@google.com>
Git-commit: 443c026e90820170aa3db2c21d2933ae5922f900
Git-repo: https://android.googlesource.com/kernel/msm
Signed-off-by: Omprakash Dhyade <odhyade@codeaurora.org>
This commit is contained in:
Riley Andrews 2015-09-01 12:42:07 -07:00 • committed by Jeevan Shriram
parent d7e810a2ce
commit 3956eabb34
1 changed files with 10 additions and 2 deletions
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12
drivers/android/binder.c
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@ -1710,8 +1710,16 @@ 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)) {
preempt_disable();
wake_up_interruptible_sync(target_wait);
sched_preempt_enable_no_resched();
}
else {
wake_up_interruptible(target_wait);
}
}
return;
err_get_unused_fd_failed: