On Tue, Jul 07, 2015 at 05:59:59PM -0400, Waiman Long wrote:
> On 07/07/2015 07:24 AM, Peter Zijlstra wrote:
> >On Mon, Jul 06, 2015 at 11:43:06AM -0400, Waiman Long wrote:
> >>Lock waiting in the qrwlock uses the spinlock (qspinlock for x86)
> >>as the waiting queue. This is slower than using MCS
On 07/07/2015 07:24 AM, Peter Zijlstra wrote:
On Mon, Jul 06, 2015 at 11:43:06AM -0400, Waiman Long wrote:
Lock waiting in the qrwlock uses the spinlock (qspinlock for x86)
as the waiting queue. This is slower than using MCS lock directly
because of the extra level of indirection causing more at
On Mon, Jul 06, 2015 at 11:43:06AM -0400, Waiman Long wrote:
> Lock waiting in the qrwlock uses the spinlock (qspinlock for x86)
> as the waiting queue. This is slower than using MCS lock directly
> because of the extra level of indirection causing more atomics to
> be used as well as 2 waiting thr
Lock waiting in the qrwlock uses the spinlock (qspinlock for x86)
as the waiting queue. This is slower than using MCS lock directly
because of the extra level of indirection causing more atomics to
be used as well as 2 waiting threads spinning on the lock cacheline
instead of only one.
This patch
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