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Message-Id: <1396017924-7754-2-git-send-email-jovi.zhangwei@gmail.com>
Date: Fri, 28 Mar 2014 10:44:56 -0400
From: Jovi Zhangwei <jovi.zhangwei@...il.com>
To: Ingo Molnar <mingo@...hat.com>,
Steven Rostedt <rostedt@...dmis.org>
Cc: linux-kernel@...r.kernel.org,
Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Frederic Weisbecker <fweisbec@...il.com>,
Andi Kleen <andi@...stfloor.org>,
Jovi Zhangwei <jovi.zhangwei@...il.com>
Subject: [PATCH v2 01/29] ktap: add tools/ktap/README.md file
Signed-off-by: Jovi Zhangwei <jovi.zhangwei@...il.com>
---
tools/ktap/README.md | 149 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 149 insertions(+)
create mode 100644 tools/ktap/README.md
diff --git a/tools/ktap/README.md b/tools/ktap/README.md
new file mode 100644
index 0000000..66dc2d1
--- /dev/null
+++ b/tools/ktap/README.md
@@ -0,0 +1,149 @@
+# ktap
+
+A New Scripting Dynamic Tracing Tool For Linux
+[www.ktap.org][homepage]
+
+ktap is a new scripting dynamic tracing tool for Linux,
+it uses a scripting language and lets users trace the Linux kernel dynamically.
+ktap is designed to give operational insights with interoperability
+that allows users to tune, troubleshoot and extend the kernel and applications.
+It's similar to Linux Systemtap and Solaris Dtrace.
+
+ktap has different design principles from Linux mainstream dynamic tracing
+language in that it's based on bytecode, so it doesn't depend upon GCC,
+doesn't require compiling kernel module for each script, safe to use in
+production environment, fulfilling the embedded ecosystem's tracing needs.
+
+More information can be found at [ktap homepage][homepage].
+
+[homepage]: http://www.ktap.org
+
+## Highlights
+
+* a simple but powerful scripting language
+* register based interpreter (heavily optimized) in Linux kernel
+* small and lightweight
+* not depend on the gcc toolchain for each script run
+* easy to use in embedded environments without debugging info
+* support for tracepoint, kprobe, uprobe, function trace, timer, and more
+* supported in x86, arm, ppc, mips
+* safety in sandbox
+
+
+## Building & Running
+
+1. Clone ktap from github
+
+ $ git clone http://github.com/ktap/ktap.git
+2. Compiling ktap
+
+ $ cd ktap
+ $ make #generate ktapvm kernel module and ktap binary
+3. Load ktapvm kernel module(make sure debugfs mounted)
+
+ $ make load #need to be root or have sudo access
+4. Running ktap
+
+ $ ./ktap samples/helloworld.kp
+
+
+## Examples
+
+1. simplest one-liner command to enable all tracepoints
+
+ ktap -e "trace *:* { print(argstr) }"
+2. syscall tracing on target process
+
+ ktap -e "trace syscalls:* { print(argstr) }" -- ls
+3. ftrace(kernel newer than 3.3, and must compiled with CONFIG_FUNCTION_TRACER)
+
+ ktap -e "trace ftrace:function { print(argstr) }"
+
+ ktap -e "trace ftrace:function /ip==mutex*/ { print(argstr) }"
+4. simple syscall tracing
+
+ trace syscalls:* {
+ print(cpu, pid, execname, argstr)
+ }
+5. syscall tracing in histogram style
+
+ var s = {}
+
+ trace syscalls:sys_enter_* {
+ s[probename] += 1
+ }
+
+ trace_end {
+ print_hist(s)
+ }
+6. kprobe tracing
+
+ trace probe:do_sys_open dfd=%di fname=%dx flags=%cx mode=+4($stack) {
+ print("entry:", execname, argstr)
+ }
+
+ trace probe:do_sys_open%return fd=$retval {
+ print("exit:", execname, argstr)
+ }
+7. uprobe tracing
+
+ trace probe:/lib/libc.so.6:malloc {
+ print("entry:", execname, argstr)
+ }
+
+ trace probe:/lib/libc.so.6:malloc%return {
+ print("exit:", execname, argstr)
+ }
+8. stapsdt tracing (userspace static marker)
+
+ trace sdt:/lib64/libc.so.6:lll_futex_wake {
+ print("lll_futex_wake", execname, argstr)
+ }
+
+ or:
+
+ #trace all static mark in libc
+ trace sdt:/lib64/libc.so.6:* {
+ print(execname, argstr)
+ }
+9. timer
+
+ tick-1ms {
+ printf("time fired on one cpu\n");
+ }
+
+ profile-2s {
+ printf("time fired on every cpu\n");
+ }
+
+More examples can be found at [samples][samples_dir] directory.
+
+[samples_dir]: https://github.com/ktap/ktap/tree/master/samples
+
+## Mailing list
+
+ktap@...elists.org
+You can subscribe to ktap mailing list at link (subscribe before posting):
+http://www.freelists.org/list/ktap
+
+
+## Copyright and License
+
+ktap is licensed under GPL v2
+
+Copyright (C) 2012-2014, Jovi Zhangwei <jovi.zhangwei@...il.com>.
+All rights reserved.
+
+
+## Contribution
+
+ktap is still under active development, so contributions are welcome.
+You are encouraged to report bugs, provide feedback, send feature request,
+or hack on it.
+
+
+## See More
+
+More info can be found at [documentation][tutorial]
+[tutorial]: http://www.ktap.org/doc/tutorial.html
+
--
1.8.1.4
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