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74a497fae7
VMCS12 fields that are not handled through shadow VMCS are rarely written, and thus they are also almost constant in the vmcs02. We can thus optimize prepare_vmcs02 by skipping all the work for non-shadowed fields in the common case. This patch introduces the (pretty simple) tracking infrastructure; the next patches will move work to prepare_vmcs02_full and save a few hundred clock cycles per VMRESUME on a Haswell Xeon E5 system: before after cpuid 14159 13869 vmcall 15290 14951 inl_from_kernel 17703 17447 outl_to_kernel 16011 14692 self_ipi_sti_nop 16763 15825 self_ipi_tpr_sti_nop 17341 15935 wr_tsc_adjust_msr 14510 14264 rd_tsc_adjust_msr 15018 14311 mmio-wildcard-eventfd:pci-mem 16381 14947 mmio-datamatch-eventfd:pci-mem 18620 17858 portio-wildcard-eventfd:pci-io 15121 14769 portio-datamatch-eventfd:pci-io 15761 14831 (average savings 748, stdev 460). Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Radim Krčmář <rkrcmar@redhat.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.