On Thu, Apr 09, 2015 at 09:57:21PM +0200, Peter Zijlstra wrote:
> On Mon, Apr 06, 2015 at 10:55:48PM -0400, Waiman Long wrote:
>
> > @@ -219,24 +236,30 @@ static void pv_wait_node(struct mcs_spinlock *node)
> > }
> >
> > /*
> > + * Called after setting next->locked = 1 & lock acquired.
> > +
On Mon, Apr 06, 2015 at 10:55:48PM -0400, Waiman Long wrote:
> @@ -219,24 +236,30 @@ static void pv_wait_node(struct mcs_spinlock *node)
> }
>
> /*
> + * Called after setting next->locked = 1 & lock acquired.
> + * Check if the the CPU has been halted. If so, set the _Q_SLOW_VAL flag
> + *
On Mon, Apr 06, 2015 at 10:55:48PM -0400, Waiman Long wrote:
@@ -219,24 +236,30 @@ static void pv_wait_node(struct mcs_spinlock *node)
}
/*
+ * Called after setting next-locked = 1 lock acquired.
+ * Check if the the CPU has been halted. If so, set the _Q_SLOW_VAL flag
+ * and put an
On Thu, Apr 09, 2015 at 09:57:21PM +0200, Peter Zijlstra wrote:
On Mon, Apr 06, 2015 at 10:55:48PM -0400, Waiman Long wrote:
@@ -219,24 +236,30 @@ static void pv_wait_node(struct mcs_spinlock *node)
}
/*
+ * Called after setting next-locked = 1 lock acquired.
+ * Check if the
Before this patch, a CPU may have been kicked twice before getting
the lock - one before it becomes queue head and once before it gets
the lock. All these CPU kicking and halting (VMEXIT) can be expensive
and slow down system performance, especially in an overcommitted guest.
This patch add a new
Before this patch, a CPU may have been kicked twice before getting
the lock - one before it becomes queue head and once before it gets
the lock. All these CPU kicking and halting (VMEXIT) can be expensive
and slow down system performance, especially in an overcommitted guest.
This patch add a new
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