From: Rik van Riel <riel@redhat.com>
Date: Tue, 1 Feb 2011 14:53:28 +0000 (-0500)
Subject: KVM: use yield_to instead of sleep in kvm_vcpu_on_spin
X-Git-Tag: v2.6.39-rc1~436^2~28
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=217ece6129f2d3b4fdd18d9e79be9e43d8d14a42;p=pandora-kernel.git

KVM: use yield_to instead of sleep in kvm_vcpu_on_spin

Instead of sleeping in kvm_vcpu_on_spin, which can cause gigantic
slowdowns of certain workloads, we instead use yield_to to get
another VCPU in the same KVM guest to run sooner.

This seems to give a 10-15% speedup in certain workloads.

Signed-off-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
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