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Re: [Xen-devel] [PATCH RFC V9 0/19] Paravirtualized ticket spinlocks
- To: Andi Kleen <andi@xxxxxxxxxxxxxx>
- From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
- Date: Sat, 01 Jun 2013 13:28:00 -0700
- Cc: x86@xxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, linux-doc@xxxxxxxxxxxxxxx, peterz@xxxxxxxxxxxxx, drjones@xxxxxxxxxx, virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx, srivatsa.vaddagiri@xxxxxxxxx, hpa@xxxxxxxxx, stefano.stabellini@xxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx, gleb@xxxxxxxxxx, Raghavendra K T <raghavendra.kt@xxxxxxxxxxxxxxxxxx>, agraf@xxxxxxx, mingo@xxxxxxxxxx, habanero@xxxxxxxxxxxxxxxxxx, konrad.wilk@xxxxxxxxxx, ouyang@xxxxxxxxxxx, mtosatti@xxxxxxxxxx, avi.kivity@xxxxxxxxx, tglx@xxxxxxxxxxxxx, chegu_vinod@xxxxxx, gregkh@xxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, attilio.rao@xxxxxxxxxx, pbonzini@xxxxxxxxxx, torvalds@xxxxxxxxxxxxxxxxxxxx, stephan.diestelhorst@xxxxxxx
- Delivery-date: Sat, 01 Jun 2013 20:28:37 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
On 06/01/2013 01:14 PM, Andi Kleen wrote:
> FWIW I use the paravirt spinlock ops for adding lock elision
> to the spinlocks.
Does lock elision still use the ticketlock algorithm/structure, or are
they different? If they're still basically ticketlocks, then it seems
to me that they're complimentary - hle handles the fastpath, and pv the
slowpath.
> This needs to be done at the top level (so the level you're removing)
>
> However I don't like the pv mechanism very much and would
> be fine with using an static key hook in the main path
> like I do for all the other lock types.
Right.
J
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