On 08/18/2016 10:14 AM, Peter Zijlstra wrote:
On Wed, Aug 10, 2016 at 11:44:08AM -0700, Jason Low wrote:
diff --git a/include/linux/mutex.h b/include/linux/mutex.h
index 2cb7531..5643a233 100644
--- a/include/linux/mutex.h
+++ b/include/linux/mutex.h
@@ -57,6 +57,8 @@ struct mutex {
#endif
#
On Thu, Aug 18, 2016 at 04:27:35PM +0200, Peter Zijlstra wrote:
> On Wed, Aug 10, 2016 at 11:44:08AM -0700, Jason Low wrote:
> > @@ -556,8 +604,12 @@ __mutex_lock_common(struct mutex *lock, long state,
> > unsigned int subclass,
> > * other waiters. We only attempt the xchg if the cou
On Thu, Aug 18, 2016 at 05:18:43PM +0200, Peter Zijlstra wrote:
> On Thu, Aug 18, 2016 at 04:27:35PM +0200, Peter Zijlstra wrote:
> > On Wed, Aug 10, 2016 at 11:44:08AM -0700, Jason Low wrote:
> > > @@ -556,8 +604,12 @@ __mutex_lock_common(struct mutex *lock, long state,
> > > unsigned int subclas
On Wed, Aug 10, 2016 at 11:44:08AM -0700, Jason Low wrote:
> diff --git a/include/linux/mutex.h b/include/linux/mutex.h
> index 2cb7531..5643a233 100644
> --- a/include/linux/mutex.h
> +++ b/include/linux/mutex.h
> @@ -57,6 +57,8 @@ struct mutex {
> #endif
> #ifdef CONFIG_MUTEX_SPIN_ON_OWNER
>
On Wed, Aug 10, 2016 at 11:44:08AM -0700, Jason Low wrote:
> @@ -556,8 +604,12 @@ __mutex_lock_common(struct mutex *lock, long state,
> unsigned int subclass,
>* other waiters. We only attempt the xchg if the count is
>* non-negative in order to avoid unnecessary xc
2016-08-18 2:30 GMT+08:00 Jason Low :
> Hi Wanpeng,
>
> On Wed, 2016-08-17 at 09:41 +0800, Wanpeng Li wrote:
>> 2016-08-11 2:44 GMT+08:00 Jason Low :
>> > Imre reported an issue where threads are getting starved when trying
>> > to acquire a mutex. Threads acquiring a mutex can get arbitrarily dela
Hi Wanpeng,
On Wed, 2016-08-17 at 09:41 +0800, Wanpeng Li wrote:
> 2016-08-11 2:44 GMT+08:00 Jason Low :
> > Imre reported an issue where threads are getting starved when trying
> > to acquire a mutex. Threads acquiring a mutex can get arbitrarily delayed
> > sleeping on a mutex because other thre
2016-08-11 2:44 GMT+08:00 Jason Low :
> Imre reported an issue where threads are getting starved when trying
> to acquire a mutex. Threads acquiring a mutex can get arbitrarily delayed
> sleeping on a mutex because other threads can continually steal the lock
> in the fastpath and/or through optimi
On Thu, 2016-08-11 at 04:01 +0800, kbuild test robot wrote:
> Hi Jason,
>
> [auto build test ERROR on tip/locking/core]
> [also build test ERROR on v4.8-rc1 next-20160809]
> [if your patch is applied to the wrong git tree, please drop us a note to
> help improve the system]
>
> url:
> https:
On Thu, 2016-08-11 at 11:40 -0400, Waiman Long wrote:
> On 08/10/2016 02:44 PM, Jason Low wrote:
> > +static inline void do_yield_to_waiter(struct mutex *lock, int *wakeups)
> > +{
> > + return;
> > +}
> > +
> > +static inline void clear_yield_to_waiter(struct mutex *lock)
> > +{
> > + return;
On 08/10/2016 02:44 PM, Jason Low wrote:
Imre reported an issue where threads are getting starved when trying
to acquire a mutex. Threads acquiring a mutex can get arbitrarily delayed
sleeping on a mutex because other threads can continually steal the lock
in the fastpath and/or through optimisti
On Wed, 2016-08-10 at 11:44 -0700, Jason Low wrote:
> @@ -917,11 +976,12 @@ EXPORT_SYMBOL(mutex_trylock);
> int __sched
> __ww_mutex_lock(struct ww_mutex *lock, struct ww_acquire_ctx *ctx)
> {
> - int ret;
> + int ret = 1;
>
> might_sleep();
>
> - ret = __mutex_fastpath_loc
On Wed, 2016-08-10 at 11:44 -0700, Jason Low wrote:
> Imre reported an issue where threads are getting starved when trying
> to acquire a mutex. Threads acquiring a mutex can get arbitrarily delayed
> sleeping on a mutex because other threads can continually steal the lock
> in the fastpath and/or
Hi Jason,
[auto build test ERROR on tip/locking/core]
[also build test ERROR on v4.8-rc1 next-20160809]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system]
url:
https://github.com/0day-ci/linux/commits/Jason-Low/locking-mutex-Prevent-lock-starva
Hi Jason,
[auto build test WARNING on tip/locking/core]
[also build test WARNING on v4.8-rc1 next-20160809]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system]
url:
https://github.com/0day-ci/linux/commits/Jason-Low/locking-mutex-Prevent-lock-st
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