v2 -> v3: * grow/shrink vcpu->halt_poll_ns by *halt_poll_ns_grow or /halt_poll_ns_shrink * drop the macros and hard coding the numbers in the param definitions * update the comments "5-7 us" * remove halt_poll_ns_max and use halt_poll_ns as the max halt_poll_ns time, vcpu->halt_poll_ns start at zero * drop the wrappers * move the grow/shrink logic before "out:" w/ "if (waited)" v1 -> v2: * change kvm_vcpu_block to read halt_poll_ns from the vcpu instead of the module parameter * use the shrink/grow matrix which is suggested by David * set halt_poll_ns_max to 2ms There is a downside of halt_poll_ns since poll is still happen for idle VCPU which can waste cpu usage. This patchset add the ability to adjust halt_poll_ns dynamically. There are two new kernel parameters for changing the halt_poll_ns: halt_poll_ns_grow and halt_poll_ns_shrink. The shrink/grow matrix is suggested by David: if (poll successfully for interrupt): stay the same else if (length of kvm_vcpu_block is longer than halt_poll_ns_max): shrink else if (length of kvm_vcpu_block is less than halt_poll_ns_max): grow Wanpeng Li (3): KVM: make halt_poll_ns per-VCPU KVM: dynamic halt_poll_ns adjustment KVM: trace kvm_halt_poll_ns grow/shrink include/linux/kvm_host.h | 1 + include/trace/events/kvm.h | 30 ++++++++++++++++++++++++++ virt/kvm/kvm_main.c | 52 +++++++++++++++++++++++++++++++++++++++++++--- 3 files changed, 80 insertions(+), 3 deletions(-) -- 1.9.1 -- 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
