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Re: [Xen-devel] [PATCH RFC V6 0/11] Paravirtualized ticketlocks
- To: Avi Kivity <avi@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>
- From: Raghavendra K T <raghavendra.kt@xxxxxxxxxxxxxxxxxx>
- Date: Mon, 02 Apr 2012 17:45:27 +0530
- Cc: Marcelo Tosatti <mtosatti@xxxxxxxxxx>, KVM <kvm@xxxxxxxxxxxxxxx>, Alan Meadows <alan.meadows@xxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>, the arch/x86 maintainers <x86@xxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Andi Kleen <andi@xxxxxxxxxxxxxx>, Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>, Srivatsa Vaddagiri <vatsa@xxxxxxxxxxxxxxxxxx>, Attilio Rao <attilio.rao@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxx>, Virtualization <virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Xen Devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Stephan Diestelhorst <stephan.diestelhorst@xxxxxxx>
- Delivery-date: Mon, 02 Apr 2012 12:18:11 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
On 04/02/2012 03:21 PM, Raghavendra K T wrote:
On 04/01/2012 07:23 PM, Avi Kivity wrote:
> On 04/01/2012 04:48 PM, Raghavendra K T wrote:
>>>> I have patch something like below in mind to try:
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 5127668..3fa912a 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1557,12 +1557,17 @@ void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
mark_page_dirty_in_slot(kvm, memslot, gfn);
}
+#define YIELD_THRESHOLD 2048
+static void kvm_vcpu_try_yield_to(struct kvm_vcpu *me);
/*
* The vCPU has executed a HLT instruction with in-kernel mode enabled.
*/
void kvm_vcpu_block(struct kvm_vcpu *vcpu)
{
[...]
+ if (loop_count++ % YIELD_THRESHOLD)
+ schedule();
+ else
+ kvm_vcpu_try_yield_to(vcpu);
}
+static void kvm_vcpu_try_yield(struct kvm_vcpu *me)
yes, it is kvm_vcpu_try_yield_to. had changed the name just before
sending. sorry.
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