On Fri, Jul 19, 2013 at 7:23 PM, Marc Zyngier <marc.zyngier@xxxxxxx> wrote: > So far, when a guest executes WFE (like when waiting for a spinlock > to become unlocked), we don't do a thing and let it run uninterrupted. > > Another option is to trap a blocking WFE and offer the opportunity > to the scheduler to switch to another task, potentially giving the > vcpu holding the spinlock a chance to run sooner. > Idea looks to be correct from my experiments on x86. It does bring some percentage of benefits in overcommitted guests. Infact, https://lkml.org/lkml/2013/7/22/41 tries to do the same thing for x86. (this results in using ple handler heuristics in vcpu_block pach). -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
