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State of a register doesn't matter if it wasn't read in reaching an exit; a write screens off all reads downstream of it from all explored_states upstream of it. This allows us to prune many more branches; here are some processed insn counts for some Cilium programs: Program before after bpf_lb_opt_-DLB_L3.o 6515 3361 bpf_lb_opt_-DLB_L4.o 8976 5176 bpf_lb_opt_-DUNKNOWN.o 2960 1137 bpf_lxc_opt_-DDROP_ALL.o 95412 48537 bpf_lxc_opt_-DUNKNOWN.o 141706 78718 bpf_netdev.o 24251 17995 bpf_overlay.o 10999 9385 The runtime is also improved; here are 'time' results in ms: Program before after bpf_lb_opt_-DLB_L3.o 24 6 bpf_lb_opt_-DLB_L4.o 26 11 bpf_lb_opt_-DUNKNOWN.o 11 2 bpf_lxc_opt_-DDROP_ALL.o 1288 139 bpf_lxc_opt_-DUNKNOWN.o 1768 234 bpf_netdev.o 62 31 bpf_overlay.o 15 13 Signed-off-by: Edward Cree <ecree@solarflare.com> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>
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.