illumos动态追踪指南：使用DTrace理解系统行为

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“illumos Dynamic Tracing Guide”是针对illumos操作系统的一个详细动态追踪框架DTrace的指南。该文档以纯英文编写，提供PDF格式，并带有目录，适合SPARC和x86架构的系统。文档不仅介绍了如何使用DTrace观察、调试和优化系统行为，还包含了DTrace可观察性工具的完整参考和D编程语言的说明。 DTrace是illumos操作系统内置的一种全面的动态追踪工具，它允许管理员、开发者和服务人员简洁地回答关于操作系统和用户程序行为的各种问题。对于想要理解系统行为的人来说，DTrace是一个强大的工具。它支持对用户程序和操作系统行为的检查，适用于实时生产环境。通过DTrace，用户可以创建自定义程序，动态地对系统进行仪器化，以DTrace的D编程语言快速解答任意问题。 DTrace的主要功能包括： 1. 动态启用和管理数千个探针。 2. 将逻辑谓词和动作与探针动态关联。 3. 动态管理追踪缓冲区和缓冲策略。 4. 从运行中的系统或崩溃转储中显示和检查追踪数据。此指南面向illumos的开发者和管理员，他们可以利用DTrace实现自定义脚本和分层工具来获取追踪数据。虽然熟悉C语言或awk、perl等脚本语言有助于更快地学习DTrace和D语言，但并不需要成为这些领域的专家。对于没有编程经验的读者，指南提供了其他相关文档的参考信息，以便进一步学习。 DTrace技术涉及Sun Microsystems的知识产权，可能包括一项或多项美国专利或待审专利申请，以及其他国家的专利。此外，该产品可能包含第三方开发的材料，部分可能源自伯克利BSD系统，从加利福尼亚大学获得许可。UNIX是X/Open Company, Ltd.在美国和其他国家的注册商标。 “illumos Dynamic Tracing Guide”是深入理解和有效利用DTrace的强大资源，无论是对于解决性能问题、调试异常行为，还是为了增进对系统运作机制的理解，都是不可或缺的工具。

Tables

TABLE 2–1 D Keywords ................................................................................................................ 47

TABLE 2–2 D Integer Data Types ................................................................................................ 48

TABLE 2–3 D Integer Type Aliases .............................................................................................. 49

TABLE 2–4 D Floating-Point Data Types ................................................................................... 50

TABLE 2–5 D Character Escape Sequences ................................................................................ 51

TABLE 2–6 D Binary Arithmetic Operators ............................................................................... 51

TABLE 2–7 D Relational Operators ............................................................................................. 52

TABLE 2–8 D Logical Operators .................................................................................................. 53

TABLE 2–9 D Bitwise Operators .................................................................................................. 54

TABLE 2–10 D Assignment Operators .......................................................................................... 55

TABLE 2–11 D Operator Precedence and Associativity .............................................................. 58

TABLE 3–1 DTrace Built-in Variables ......................................................................................... 69

TABLE 4–1 Probe Name Pattern Matching Characters ............................................................. 74

TABLE 6–1 D Relational Operators for Strings .......................................................................... 87

TABLE 9–1 DTrace Aggregating Functions .............................................................................. 109

TABLE 13–1 DTrace Speculation Functions ............................................................................... 164

TABLE 15–1 D Macro Variables ...................................................................................................183

TABLE 16–1 DTrace Consumer Options .................................................................................... 187

TABLE 18–1 Adaptive Lock Probes .............................................................................................196

TABLE 18–2 Spin Lock Probes .....................................................................................................196

TABLE 18–3 Thread Lock Probe ..................................................................................................198

TABLE 18–4 Readers/Writer Lock Probes ..................................................................................198

TABLE 19–1 Valid time suxes ...................................................................................................201

TABLE 21–1 sycall Large File Probes ........................................................................................ 222

TABLE 22–1 SDT Probes ...............................................................................................................225

TABLE 23–1 sysinfo Probes ........................................................................................................233

TABLE 24–1 vminfo Probes ..........................................................................................................242

TABLE 25–1 proc Probes ..............................................................................................................249

TABLE 25–2 proc Probe Arguments ........................................................................................... 251

TABLE 25–3 pr_flag Values ........................................................................................................252

TABLE 25–4 pr_stype Values ......................................................................................................253

TABLE 25–5 pr_state Values ......................................................................................................254

TABLE 26–1 sched Probes ............................................................................................................263

TABLE 26–2 sched Probe Arguments ......................................................................................... 266

TABLE 27–1 io Probes ..................................................................................................................297

TABLE 27–2 io Probe Arguments ...............................................................................................298

TABLE 27–3 b_flags Values ........................................................................................................299

TABLE 28–1 mib probes ................................................................................................................315

TABLE 28–2 ICMP mib Probes ..................................................................................................... 316

TABLE 28–3 IP mib Probes ............................................................................................................317

TABLE 28–4 IPsec mib Probes ......................................................................................................319

TABLE 28–5 IPv6 mib Probes ....................................................................................................... 319

TABLE 28–6 Raw IP mib Probes ................................................................................................... 324

TABLE 28–7 SCTP mib Probes .....................................................................................................325

TABLE 28–8 TCP mib Probes ....................................................................................................... 327

TABLE 28–9 UDP mib Probes ....................................................................................................... 329

TABLE 29–1 fpuinfo Probes ........................................................................................................331

TABLE 31–1 Mutex Probes ........................................................................................................... 340

TABLE 31–2 Readers/Writer Lock Probes ..................................................................................341

TABLE 33–1 SPARC uregs[] Constants ....................................................................................350

TABLE 33–2 x86 uregs[] Constants ...........................................................................................351

TABLE 33–3 amd64 uregs[] Constants ..................................................................................... 351

TABLE 33–4 Common uregs[] Constants ................................................................................352

TABLE 40–1 procfs.d Translators .............................................................................................. 393

TABLE 41–1 DTrace Release Versions ........................................................................................396

Tables

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