diff options
Diffstat (limited to 'kernel')
-rw-r--r-- | kernel/sched.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index 41541d79e3c8..09b574e7f4df 100644 --- a/kernel/sched.c +++ b/kernel/sched.c | |||
@@ -3865,8 +3865,16 @@ int mutex_spin_on_owner(struct mutex *lock, struct thread_info *owner) | |||
3865 | /* | 3865 | /* |
3866 | * Owner changed, break to re-assess state. | 3866 | * Owner changed, break to re-assess state. |
3867 | */ | 3867 | */ |
3868 | if (lock->owner != owner) | 3868 | if (lock->owner != owner) { |
3869 | /* | ||
3870 | * If the lock has switched to a different owner, | ||
3871 | * we likely have heavy contention. Return 0 to quit | ||
3872 | * optimistic spinning and not contend further: | ||
3873 | */ | ||
3874 | if (lock->owner) | ||
3875 | return 0; | ||
3869 | break; | 3876 | break; |
3877 | } | ||
3870 | 3878 | ||
3871 | /* | 3879 | /* |
3872 | * Is that owner really running on that cpu? | 3880 | * Is that owner really running on that cpu? |