On Tue, Jan 28, 2014 at 02:10:41PM -0800, Jason Low wrote:
> On Tue, 2014-01-28 at 12:23 -0800, Paul E. McKenney wrote:
> > On Tue, Jan 28, 2014 at 11:13:13AM -0800, Jason Low wrote:
> > > /*
> > >* The cpu_relax() call is a compiler barrier which forces
> > > @@ -514,6 +511,7
On Tue, 2014-01-28 at 12:23 -0800, Paul E. McKenney wrote:
> On Tue, Jan 28, 2014 at 11:13:13AM -0800, Jason Low wrote:
> > /*
> > * The cpu_relax() call is a compiler barrier which forces
> > @@ -514,6 +511,7 @@ __mutex_lock_common(struct mutex *lock, long state,
> > unsi
On Tue, 2014-01-28 at 12:23 -0800, Paul E. McKenney wrote:
> On Tue, Jan 28, 2014 at 11:13:13AM -0800, Jason Low wrote:
> > ...
> > if (!owner && (need_resched() || rt_task(task)))
> > - goto slowpath;
> > + break;
> >
> > /*
> >
On Tue, Jan 28, 2014 at 12:23:34PM -0800, Paul E. McKenney wrote:
> On Tue, Jan 28, 2014 at 11:13:13AM -0800, Jason Low wrote:
> > The mutex->spin_mlock was introduced in order to ensure that only 1 thread
> > spins for lock acquisition at a time to reduce cache line contention. When
> > lock->owne
On Tue, Jan 28, 2014 at 11:13:13AM -0800, Jason Low wrote:
> The mutex->spin_mlock was introduced in order to ensure that only 1 thread
> spins for lock acquisition at a time to reduce cache line contention. When
> lock->owner is NULL and the lock->count is still not 1, the spinner(s) will
> contin
The mutex->spin_mlock was introduced in order to ensure that only 1 thread
spins for lock acquisition at a time to reduce cache line contention. When
lock->owner is NULL and the lock->count is still not 1, the spinner(s) will
continually release and obtain the lock->spin_mlock. This can generate
qu
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