如何使用uprobe跟踪OpenJDK HotSpot源代码？ [英] How to use uprobe to trace OpenJDK HotSpot source code?

问题描述

我尝试按照链接

在此示例，

Tracing func_abc() in my test program, and including user-level stacks:

# ./uprobe -s p:/root/func_abc:func_c
Tracing uprobe func_c (p:func_c /root/func_abc:0x4f4). Ctrl-C to end.
        func_abc-25394 [000] d... 19603250.054040: func_c: (0x4004f4)
        func_abc-25394 [000] d... 19603250.054056: <user stack trace>
 =>  <00000000004004f4>
 =>  <0000000000400527>
 =>  <0000000000400537>
 =>  <00007fca9f0e376d>
        func_abc-25394 [000] d... 19603251.054250: func_c: (0x4004f4)
        func_abc-25394 [000] d... 19603251.054266: <user stack trace>
 =>  <00000000004004f4>
 =>  <0000000000400527>
 =>  <0000000000400537>
 =>  <00007fca9f0e376d>
^C
Ending tracing...

我想探测函数< a href =http://hg.openjdk.java.net/jdk9/jdk9/hotspot/file/b756e7a2ec33/src/share/vm/gc/shared/adaptiveSizePolicy.cpp#l223 =nofollow noreferrer> minor_collection_begin 但它显示错误：缺少符号。

I want to probe function minor_collection_begin but it shows ERROR: missing symbol.

root@wxf:/home/wxf/perf-tool/perf-tools/bin# ./uprobe -s p:/home/wxf/9dev/build/linux-x86_64-normal-server-slowdebug/jdk/bin/java:AdaptiveSizePolicy::minor_collection_begin
ERROR: missing symbol "minor_collection_begin" in /home/wxf/9dev/build/linux-x86_64-normal-server-slowdebug/jdk/bin/java
root@wxf:/home/wxf/perf-tool/perf-tools/bin# ./uprobe -s p:/home/wxf/9dev/build/linux-x86_64-normal-server-slowdebug/jdk/bin/java:minor_collection_begin
ERROR: missing symbol "minor_collection_begin" in /home/wxf/9dev/build/linux-x86_64-normal-server-slowdebug/jdk/bin/java

我经常搜索并发现它与之相关 libjvm.so 。但是，我不知道下一步该做什么。

I search a lot and find it is related to libjvm.so. However, I don't know what to do next.

wxf@wxf:/home/wxf/adjustableMaxHeapSize_9jdk_prj/9dev$ find -name "libjvm.so"
./build/linux-x86_64-normal-server-slowdebug/support/modules_libs/java.base/server/libjvm.so
./build/linux-x86_64-normal-server-slowdebug/hotspot/variant-server/libjvm/gtest/libjvm.so
./build/linux-x86_64-normal-server-slowdebug/jdk/lib/server/libjvm.so

推荐答案

C ++符号是 mangled 。你找不到 minor_collection_begin 。 的错位符号名称void AdaptiveSizePolicy :: minor_collection_begin（）是

C++ symbols are mangled in binary objects. You won't find minor_collection_begin. The mangled symbol name for void AdaptiveSizePolicy::minor_collection_begin() is

_ZN18AdaptiveSizePolicy22minor_collection_beginEv

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