On 09/06/2017 03:08 AM, Peter Zijlstra wrote: > Guys, please trim email. > > On Tue, Sep 05, 2017 at 10:31:46AM -0400, Waiman Long wrote: >> For clarification, I was actually asking if you consider just adding one >> more jump label to skip it for Xen/KVM instead of making >> virt_spin_lock() a pv-op. > I don't understand. What performance are you worried about. Native will > now do: "xor rax,rax; jnz some_cold_label" that's fairly trival code. It is not native that I am talking about. I am worry about VM with non-Xen/KVM hypervisor where virt_spin_lock() will actually be called. Now that function will become a callee-saved function call instead of being inlined into the native slowpath function. Cheers, Longman _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
