While initializing emulation context structure, kvm memsets to 0 a number of fields some of which are redundant since they get set eventually. This patch attempts at avoiding some of them.
Here are some before/after numbers on a Haswell host Note : The before numbers already include Paolo's RFC posted here : http://comments.gmane.org/gmane.linux.kernel/1676101 Before: 667 cycles/emulated jump instruction 839 cycles/emulated move instruction 892 cycles/emulated arithmetic instruction 995 cycles/emulated memory load instruction 1026 cycles/emulated memory store instruction 1022 cycles/emulated memory RMW instruction After: 639 cycles/emulated jump instruction 786 cycles/emulated move instruction 802 cycles/emulated arithmetic instruction 936 cycles/emulated memory load instruction 970 cycles/emulated memory store instruction 1000 cycles/emulated memory RMW instruction Bandan Das (2): KVM: emulate: move init_decode_cache to emulate.c KVM: emulate: clean up initializations in init_decode_cache arch/x86/include/asm/kvm_emulate.h | 17 +++++++------ arch/x86/kvm/emulate.c | 49 ++++++++++++++++++++++++++++++++++++++ arch/x86/kvm/x86.c | 13 ---------- 3 files changed, 59 insertions(+), 20 deletions(-) -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
