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<ol class="chapter"><li class="chapter-item expanded affix "><li class="part-title">eBPF 入门开发实践教程</li><li class="chapter-item expanded "><a href="../0-introduce/index.html"><strong aria-hidden="true">1.</strong> eBPF 入门开发实践教程一：介绍 eBPF 的基本概念、常见的开发工具</a></li><li class="chapter-item expanded "><a href="../1-helloworld/index.html"><strong aria-hidden="true">2.</strong> eBPF 入门开发实践教程二：Hello World，基本框架和开发流程</a></li><li class="chapter-item expanded "><a href="../2-kprobe-unlink/index.html"><strong aria-hidden="true">3.</strong> eBPF 入门开发实践教程二：在 eBPF 中使用 kprobe 监测捕获 unlink 系统调用</a></li><li class="chapter-item expanded "><a href="../3-fentry-unlink/index.html"><strong aria-hidden="true">4.</strong> eBPF 入门开发实践教程三：在 eBPF 中使用 fentry 监测捕获 unlink 系统调用</a></li><li class="chapter-item expanded "><a href="../4-opensnoop/index.html"><strong aria-hidden="true">5.</strong> eBPF 入门开发实践教程四：在 eBPF 中捕获进程打开文件的系统调用集合，使用全局变量过滤进程 pid</a></li><li class="chapter-item expanded "><a href="../5-uprobe-bashreadline/index.html"><strong aria-hidden="true">6.</strong> eBPF 入门开发实践教程五：在 eBPF 中使用 uprobe 捕获 bash 的 readline 函数调用</a></li><li class="chapter-item expanded "><a href="../6-sigsnoop/index.html"><strong aria-hidden="true">7.</strong> eBPF 入门开发实践教程六：捕获进程发送信号的系统调用集合，使用 hash map 保存状态</a></li><li class="chapter-item expanded "><a href="../7-execsnoop/index.html"><strong aria-hidden="true">8.</strong> eBPF 入门实践教程七：捕获进程执行/退出时间，通过 perf event array 向用户态打印输出</a></li><li class="chapter-item expanded "><a href="../8-exitsnoop/index.html"><strong aria-hidden="true">9.</strong> eBPF 入门开发实践教程八：在 eBPF 中使用 exitsnoop 监控进程退出事件，使用 ring buffer 向用户态打印输出</a></li><li class="chapter-item expanded "><a href="../9-runqlat/index.html"><strong aria-hidden="true">10.</strong> eBPF 入门开发实践教程九：一个 Linux 内核 BPF 程序，通过柱状图来总结调度程序运行队列延迟，显示任务等待运行在 CPU 上的时间长度</a></li><li class="chapter-item expanded "><a href="../10-hardirqs/index.html"><strong aria-hidden="true">11.</strong> eBPF 入门开发实践教程十：在 eBPF 中使用 hardirqs 或 softirqs 捕获中断事件</a></li><li class="chapter-item expanded "><a href="../11-bootstrap/index.html"><strong aria-hidden="true">12.</strong> eBPF 入门开发实践教程十一：在 eBPF 中使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用</a></li><li class="chapter-item expanded affix "><li class="part-title">eBPF入门实践教程</li><li class="chapter-item expanded "><a href="../13-tcpconnlat/index.html"><strong aria-hidden="true">13.</strong> eBPF入门实践教程：使用 libbpf-bootstrap 开发程序统计 TCP 连接延时</a></li><li class="chapter-item expanded "><a href="../13-tcpconnlat/tcpconnlat.html"><strong aria-hidden="true">14.</strong> eBPF 入门实践教程：编写 eBPF 程序 tcpconnlat 测量 tcp 连接延时</a></li><li class="chapter-item expanded "><a href="../14-tcpstates/index.html"><strong aria-hidden="true">15.</strong> eBPF入门实践教程：使用 libbpf-bootstrap 开发程序统计 TCP 连接延时</a></li><li class="chapter-item expanded "><a href="../15-tcprtt/index.html"><strong aria-hidden="true">16.</strong> eBPF 入门实践教程：编写 eBPF 程序 Tcprtt 测量 TCP 连接的往返时间</a></li><li class="chapter-item expanded "><a href="../16-memleak/index.html"><strong aria-hidden="true">17.</strong> eBPF 入门实践教程：编写 eBPF 程序 Memleak 监控内存泄漏</a></li><li class="chapter-item expanded "><a href="../17-biopattern/index.html"><strong aria-hidden="true">18.</strong> eBPF 入门实践教程：编写 eBPF 程序 Biopattern: 统计随机/顺序磁盘 I/O</a></li><li class="chapter-item expanded "><a href="../18-further-reading/index.html"><strong aria-hidden="true">19.</strong> 更多的参考资料</a></li><li class="chapter-item expanded "><a href="../19-lsm-connect/index.html"><strong aria-hidden="true">20.</strong> eBPF 入门实践教程：使用 LSM 进行安全检测防御</a></li><li class="chapter-item expanded "><a href="../20-tc/index.html"><strong aria-hidden="true">21.</strong> eBPF 入门实践教程：使用 eBPF 进行 tc 流量控制</a></li><li class="chapter-item expanded affix "><li class="part-title">bcc Guide</li><li class="chapter-item expanded "><a href="../bcc-documents/kernel-versions.html"><strong aria-hidden="true">22.</strong> BPF Features by Linux Kernel Version</a></li><li class="chapter-item expanded "><a href="../bcc-documents/kernel_config.html" class="active"><strong aria-hidden="true">23.</strong> Kernel Configuration for BPF Features</a></li><li class="chapter-item expanded "><a href="../bcc-documents/reference_guide.html"><strong aria-hidden="true">24.</strong> bcc Reference Guide</a></li><li class="chapter-item expanded "><a href="../bcc-documents/special_filtering.html"><strong aria-hidden="true">25.</strong> Special Filtering</a></li><li class="chapter-item expanded "><a href="../bcc-documents/tutorial.html"><strong aria-hidden="true">26.</strong> bcc Tutorial</a></li><li class="chapter-item expanded "><a href="../bcc-documents/tutorial_bcc_python_developer.html"><strong aria-hidden="true">27.</strong> bcc Python Developer Tutorial</a></li></ol>
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<h1 id="kernel-configuration-for-bpf-features"><a class="header" href="#kernel-configuration-for-bpf-features">Kernel Configuration for BPF Features</a></h1>
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<h2 id="bpf-related-kernel-configurations"><a class="header" href="#bpf-related-kernel-configurations">BPF Related Kernel Configurations</a></h2>
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<div class="table-wrapper"><table><thead><tr><th style="text-align: left">Functionalities</th><th style="text-align: left">Kernel Configuration</th><th style="text-align: left">Description</th></tr></thead><tbody>
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<tr><td style="text-align: left"><strong>Basic</strong></td><td style="text-align: left">CONFIG_BPF_SYSCALL</td><td style="text-align: left">Enable the bpf() system call</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_BPF_JIT</td><td style="text-align: left">BPF programs are normally handled by a BPF interpreter. This option allows the kernel to generate native code when a program is loaded into the kernel. This will significantly speed-up processing of BPF programs</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_HAVE_BPF_JIT</td><td style="text-align: left">Enable BPF Just In Time compiler</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_HAVE_EBPF_JIT</td><td style="text-align: left">Extended BPF JIT (eBPF)</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_HAVE_CBPF_JIT</td><td style="text-align: left">Classic BPF JIT (cBPF)</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_MODULES</td><td style="text-align: left">Enable to build loadable kernel modules</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_BPF</td><td style="text-align: left">BPF VM interpreter</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_BPF_EVENTS</td><td style="text-align: left">Allow the user to attach BPF programs to kprobe, uprobe, and tracepoint events</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_PERF_EVENTS</td><td style="text-align: left">Kernel performance events and counters</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_HAVE_PERF_EVENTS</td><td style="text-align: left">Enable perf events</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_PROFILING</td><td style="text-align: left">Enable the extended profiling support mechanisms used by profilers</td></tr>
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<tr><td style="text-align: left"><strong>BTF</strong></td><td style="text-align: left">CONFIG_DEBUG_INFO_BTF</td><td style="text-align: left">Generate deduplicated BTF type information from DWARF debug info</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_PAHOLE_HAS_SPLIT_BTF</td><td style="text-align: left">Generate BTF for each selected kernel module</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_DEBUG_INFO_BTF_MODULES</td><td style="text-align: left">Generate compact split BTF type information for kernel modules</td></tr>
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<tr><td style="text-align: left"><strong>Security</strong></td><td style="text-align: left">CONFIG_BPF_JIT_ALWAYS_ON</td><td style="text-align: left">Enable BPF JIT and removes BPF interpreter to avoid speculative execution</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_BPF_UNPRIV_DEFAULT_OFF</td><td style="text-align: left">Disable unprivileged BPF by default by setting</td></tr>
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<tr><td style="text-align: left"><strong>Cgroup</strong></td><td style="text-align: left">CONFIG_CGROUP_BPF</td><td style="text-align: left">Support for BPF programs attached to cgroups</td></tr>
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<tr><td style="text-align: left"><strong>Network</strong></td><td style="text-align: left">CONFIG_BPFILTER</td><td style="text-align: left">BPF based packet filtering framework (BPFILTER)</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_BPFILTER_UMH</td><td style="text-align: left">This builds bpfilter kernel module with embedded user mode helper</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_NET_CLS_BPF</td><td style="text-align: left">BPF-based classifier - to classify packets based on programmable BPF (JIT'ed) filters as an alternative to ematches</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_NET_ACT_BPF</td><td style="text-align: left">Execute BPF code on packets. The BPF code will decide if the packet should be dropped or not</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_BPF_STREAM_PARSER</td><td style="text-align: left">Enable this to allow a TCP stream parser to be used with BPF_MAP_TYPE_SOCKMAP</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_LWTUNNEL_BPF</td><td style="text-align: left">Allow to run BPF programs as a nexthop action following a route lookup for incoming and outgoing packets</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_NETFILTER_XT_MATCH_BPF</td><td style="text-align: left">BPF matching applies a linux socket filter to each packet and accepts those for which the filter returns non-zero</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_IPV6_SEG6_BPF</td><td style="text-align: left">To support BPF seg6local hook. bpf: Add IPv6 Segment Routing helpersy. <a href="https://github.com/torvalds/linux/commit/fe94cc290f535709d3c5ebd1e472dfd0aec7ee7">Reference</a></td></tr>
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<tr><td style="text-align: left"><strong>kprobes</strong></td><td style="text-align: left">CONFIG_KPROBE_EVENTS</td><td style="text-align: left">This allows the user to add tracing events (similar to tracepoints) on the fly via the ftrace interface</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_KPROBES</td><td style="text-align: left">Enable kprobes-based dynamic events</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_HAVE_KPROBES</td><td style="text-align: left">Check if krpobes enabled</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_HAVE_REGS_AND_STACK_ACCESS_API</td><td style="text-align: left">This symbol should be selected by an architecture if it supports the API needed to access registers and stack entries from pt_regs. For example the kprobes-based event tracer needs this API.</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_KPROBES_ON_FTRACE</td><td style="text-align: left">Have kprobes on function tracer if arch supports full passing of pt_regs to function tracing</td></tr>
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<tr><td style="text-align: left"><strong>kprobe multi</strong></td><td style="text-align: left">CONFIG_FPROBE</td><td style="text-align: left">Enable fprobe to attach the probe on multiple functions at once</td></tr>
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<tr><td style="text-align: left"><strong>kprobe override</strong></td><td style="text-align: left">CONFIG_BPF_KPROBE_OVERRIDE</td><td style="text-align: left">Enable BPF programs to override a kprobed function</td></tr>
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<tr><td style="text-align: left"><strong>uprobes</strong></td><td style="text-align: left">CONFIG_UPROBE_EVENTS</td><td style="text-align: left">Enable uprobes-based dynamic events</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_ARCH_SUPPORTS_UPROBES</td><td style="text-align: left">Arch specific uprobes support</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_UPROBES</td><td style="text-align: left">Uprobes is the user-space counterpart to kprobes: they enable instrumentation applications (such as 'perf probe') to establish unintrusive probes in user-space binaries and libraries, by executing handler functions when the probes are hit by user-space applications.</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_MMU</td><td style="text-align: left">MMU-based virtualised addressing space support by paged memory management</td></tr>
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<tr><td style="text-align: left"><strong>Tracepoints</strong></td><td style="text-align: left">CONFIG_TRACEPOINTS</td><td style="text-align: left">Enable inserting tracepoints in the kernel and connect to proble functions</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_HAVE_SYSCALL_TRACEPOINTS</td><td style="text-align: left">Enable syscall enter/exit tracing</td></tr>
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<tr><td style="text-align: left"><strong>Raw Tracepoints</strong></td><td style="text-align: left">Same as Tracepoints</td><td style="text-align: left"></td></tr>
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<tr><td style="text-align: left"><strong>LSM</strong></td><td style="text-align: left">CONFIG_BPF_LSM</td><td style="text-align: left">Enable instrumentation of the security hooks with BPF programs for implementing dynamic MAC and Audit Policies</td></tr>
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<tr><td style="text-align: left"><strong>LIRC</strong></td><td style="text-align: left">CONFIG_BPF_LIRC_MODE2</td><td style="text-align: left">Allow attaching BPF programs to a lirc device</td></tr>
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