提交 3b6c5507 编写于 作者: L Linus Torvalds

Merge branch 'core-fixes-for-linus' of...

Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  mutex: Improve the scalability of optimistic spinning
......@@ -3865,8 +3865,16 @@ int mutex_spin_on_owner(struct mutex *lock, struct thread_info *owner)
/*
* Owner changed, break to re-assess state.
*/
if (lock->owner != owner)
if (lock->owner != owner) {
/*
* If the lock has switched to a different owner,
* we likely have heavy contention. Return 0 to quit
* optimistic spinning and not contend further:
*/
if (lock->owner)
return 0;
break;
}
/*
* Is that owner really running on that cpu?
......
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