tree 37f70c868acf33f7645e67c42b599cd5034614c4
parent 0a72a5ab9feb8ba6101b00bbcac14cdbae1d1df7
author Marc Zyngier <marc.zyngier@arm.com> 1529574239 +0100
committer Marc Zyngier <marc.zyngier@arm.com> 1531132704 +0100

KVM: arm/arm64: Enable adaptative WFE trapping

Trapping blocking WFE is extremely beneficial in situations where
the system is oversubscribed, as it allows another thread to run
while being blocked. In a non-oversubscribed environment, this is
the complete opposite, and trapping WFE is just unnecessary overhead.

Let's only enable WFE trapping if the CPU has more than a single task
to run (that is, more than just the vcpu thread).

Reviewed-by: Christoffer Dall <christoffer.dall@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>