On 03/30/2011 01:43 PM, Gleb Natapov wrote:
After reboot perf started to work. I ran modified emulator.flat unit test. It was modified to run test_cmps() in an endless loop. Without patch: 1.71% qemu-system-x86 [kvm] [k] x86_emulate_instruction 1.51% qemu-system-x86 [kvm] [k] x86_emulate_instruction 1.68% qemu-system-x86 [kvm] [k] x86_emulate_instruction With patch: 0.84% qemu-system-x86 [kvm] [k] x86_emulate_instruction 0.96% qemu-system-x86 [kvm] [k] x86_emulate_instruction 0.89% qemu-system-x86 [kvm] [k] x86_emulate_instruction
The cause might be kvm_rip_write() using vmwrite. Can you use perf to see where the hits are in x86_emulate_instruction?
If that's the case, we may be able to do local optimizations to kvm_rip_write(), kvm_set_rflags(), and toggle_interruptiblity() instead of this global change.
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