Perf 报告：共享对象名称在 docker 中显示为“（已删除）”

问题描述 投票：0回答：1

我分析了两个运行相同逻辑计算的二进制文件，一个用 Swift 编写，另一个用 C++ 编写。代码非常简单，只是在循环中进行一些数学计算。我正在使用 Swift docker 镜像 与 

--privileged
一起运行。

现在，我知道系统库 

libm.so
和 
libc.so
在 docker 实例中被剥离，因此符号化可能不太好，但在这种情况下，共享对象在 C++ 代码中显示为 
(deleted)
，但是不适用于 Swift 代码。

C++ 代码是用 

-g -O3 -Wall -Wextra -pedantic -std=c++20 -fwrapv -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer
编译的。我用
perf record -g
录制，这是
perf report -g 'graph,1.0,caller
的输出。

Samples: 187K of event 'cpu-clock:pppH', Event count (approx.): 46774250000                                                                                    
  Children      Self  Command  Shared Object      Symbol                                                                                                       
+  100.00%     0.00%  profile  profile            [.] _start
+  100.00%     0.00%  profile   (deleted)         [.] 0x0000ffff88e274cc
+  100.00%     0.00%  profile   (deleted)         [.] 0x0000ffff88e273fc
+  100.00%     0.00%  profile  profile            [.] main
+   76.43%     8.62%  profile  profile            [.] synthetic
+   32.22%     2.66%  profile  profile            [.] siam100_integrand
+   23.32%     0.00%  profile   (deleted)         [.] 0x0000ffff88fe54e4
+   23.32%    23.32%  profile   (deleted)         [.] 0x00000000000354e4
+   19.79%     0.00%  profile   (deleted)         [.] 0x0000ffff88fe54d8
+   19.79%    19.79%  profile   (deleted)         [.] 0x00000000000354d8
+   17.17%     0.00%  profile   (deleted)         [.] 0x0000ffff88fe88f0
+   17.17%    17.17%  profile   (deleted)         [.] 0x00000000000388f0
+    8.16%     8.16%  profile   (deleted)         [.] 0x00000000000387f4
+    8.16%     0.00%  profile   (deleted)         [.] 0x0000ffff88fe87f4
+    4.92%     4.92%  profile   (deleted)         [.] 0x00000000000354b4
+    4.92%     0.00%  profile   (deleted)         [.] 0x0000ffff88fe54b4
+    3.78%     3.78%  profile  profile            [.] cos@plt
+    2.22%     2.22%  profile  profile            [.] log@plt


profile
是二进制文件的名称。删除的共享对象条目应该主要是 
libm.so
、
libc.so
和 
kernel.kallsyms
。但是，在进入调试器时，我无法在性能报告输出中显示的地址处设置断点：例如
Cannot access memory at address 0xffff88fe54e4
。

这是使用 swift 构建的二进制文件的相同报告。

Samples: 54K of event 'cpu-clock:pppH', Event count (approx.): 13628000000                                                                                     
  Children      Self  Command  Shared Object          Symbol                                                                                                   
+   99.97%     0.00%  Run      Run                    [.] _start
+   99.97%     0.00%  Run      libc.so.6              [.] __libc_start_main@@GLIBC_2.34
+   99.97%     0.00%  Run      libc.so.6              [.] __libc_start_call_main
+   99.97%     0.00%  Run      Run                    [.] Run_main
+   43.46%    43.46%  Run      libm.so.6              [.] log@@GLIBC_2.29
+   39.18%     7.92%  Run      Run                    [.] $s7BMDemos9synthetic__9iterCountS2d_SdSitF
+   31.27%    31.26%  Run      libm.so.6              [.] __cos
+    8.41%     8.41%  Run      libm.so.6              [.] __math_invalid
+    5.97%     5.97%  Run      Run                    [.] log@plt
+    2.94%     2.94%  Run      Run                    [.] cos@plt

二进制文件之间的另一个区别是，C++ 通过过程链接表直接跳转到 

log
，而 Swift 则必须执行某种 
dlsym
查找查找。这是我在单步执行调试器 asm 行时发现的。

所以，我有以下问题。

  1. 造成两份报告差异的可能原因是什么？
  2. 如果可能的话，能否改进C++代码的报告？

附录

ldd -v
C++ 二进制文件

linux-vdso.so.1 (0x0000ffff9a112000)
    libstdc++.so.6 => /lib/aarch64-linux-gnu/libstdc++.so.6 (0x0000ffff99e90000)
    libm.so.6 => /lib/aarch64-linux-gnu/libm.so.6 (0x0000ffff99df0000)
    libc.so.6 => /lib/aarch64-linux-gnu/libc.so.6 (0x0000ffff99c40000)
    /lib/ld-linux-aarch64.so.1 (0x0000ffff9a0d9000)
    libgcc_s.so.1 => /lib/aarch64-linux-gnu/libgcc_s.so.1 (0x0000ffff99c10000)

    Version information:
    ./profile:
        libc.so.6 (GLIBC_2.34) => /lib/aarch64-linux-gnu/libc.so.6
        libc.so.6 (GLIBC_2.17) => /lib/aarch64-linux-gnu/libc.so.6
        libm.so.6 (GLIBC_2.29) => /lib/aarch64-linux-gnu/libm.so.6
        libm.so.6 (GLIBC_2.17) => /lib/aarch64-linux-gnu/libm.so.6
        libstdc++.so.6 (GLIBCXX_3.4.9) => /lib/aarch64-linux-gnu/libstdc++.so.6
        libstdc++.so.6 (GLIBCXX_3.4.11) => /lib/aarch64-linux-gnu/libstdc++.so.6
        libstdc++.so.6 (GLIBCXX_3.4) => /lib/aarch64-linux-gnu/libstdc++.so.6
    /lib/aarch64-linux-gnu/libstdc++.so.6:
        ld-linux-aarch64.so.1 (GLIBC_2.17) => /lib/ld-linux-aarch64.so.1
        libm.so.6 (GLIBC_2.17) => /lib/aarch64-linux-gnu/libm.so.6
        libc.so.6 (GLIBC_2.33) => /lib/aarch64-linux-gnu/libc.so.6
        libc.so.6 (GLIBC_2.25) => /lib/aarch64-linux-gnu/libc.so.6
        libc.so.6 (GLIBC_2.18) => /lib/aarch64-linux-gnu/libc.so.6
        libc.so.6 (GLIBC_2.32) => /lib/aarch64-linux-gnu/libc.so.6
        libc.so.6 (GLIBC_2.17) => /lib/aarch64-linux-gnu/libc.so.6
        libc.so.6 (GLIBC_2.34) => /lib/aarch64-linux-gnu/libc.so.6
        libgcc_s.so.1 (GCC_4.2.0) => /lib/aarch64-linux-gnu/libgcc_s.so.1
        libgcc_s.so.1 (GCC_3.3) => /lib/aarch64-linux-gnu/libgcc_s.so.1
        libgcc_s.so.1 (GCC_3.0) => /lib/aarch64-linux-gnu/libgcc_s.so.1
        libgcc_s.so.1 (GCC_4.5.0) => /lib/aarch64-linux-gnu/libgcc_s.so.1
    /lib/aarch64-linux-gnu/libm.so.6:
        ld-linux-aarch64.so.1 (GLIBC_2.17) => /lib/ld-linux-aarch64.so.1
        libc.so.6 (GLIBC_PRIVATE) => /lib/aarch64-linux-gnu/libc.so.6
        libc.so.6 (GLIBC_2.17) => /lib/aarch64-linux-gnu/libc.so.6
    /lib/aarch64-linux-gnu/libc.so.6:
        ld-linux-aarch64.so.1 (GLIBC_PRIVATE) => /lib/ld-linux-aarch64.so.1
        ld-linux-aarch64.so.1 (GLIBC_2.17) => /lib/ld-linux-aarch64.so.1
    /lib/aarch64-linux-gnu/libgcc_s.so.1:
        libc.so.6 (GLIBC_2.35) => /lib/aarch64-linux-gnu/libc.so.6
        libc.so.6 (GLIBC_2.34) => /lib/aarch64-linux-gnu/libc.so.6
        libc.so.6 (GLIBC_2.17) => /lib/aarch64-linux-gnu/libc.so.6


ldd -v
Swift 二进制文件

linux-vdso.so.1 (0x0000ffff8b009000)
    libswiftCore.so => /usr/lib/swift/linux/libswiftCore.so (0x0000ffff8a960000)
    libswift_Concurrency.so => /usr/lib/swift/linux/libswift_Concurrency.so (0x0000ffff8a8e0000)
    libswift_StringProcessing.so => /usr/lib/swift/linux/libswift_StringProcessing.so (0x0000ffff8a800000)
    libswift_RegexParser.so => /usr/lib/swift/linux/libswift_RegexParser.so (0x0000ffff8a6e0000)
    libswiftGlibc.so => /usr/lib/swift/linux/libswiftGlibc.so (0x0000ffff8a6b0000)
    libBlocksRuntime.so => /usr/lib/swift/linux/libBlocksRuntime.so (0x0000ffff8a690000)
    libdispatch.so => /usr/lib/swift/linux/libdispatch.so (0x0000ffff8a610000)
    libswiftDispatch.so => /usr/lib/swift/linux/libswiftDispatch.so (0x0000ffff8a5c0000)
    libFoundation.so => /usr/lib/swift/linux/libFoundation.so (0x0000ffff89d40000)
    libm.so.6 => /lib/aarch64-linux-gnu/libm.so.6 (0x0000ffff89ca0000)
    libc.so.6 => /lib/aarch64-linux-gnu/libc.so.6 (0x0000ffff89af0000)
    libstdc++.so.6 => /lib/aarch64-linux-gnu/libstdc++.so.6 (0x0000ffff898c0000)
    libgcc_s.so.1 => /lib/aarch64-linux-gnu/libgcc_s.so.1 (0x0000ffff89890000)
    /lib/ld-linux-aarch64.so.1 (0x0000ffff8afd0000)
    libicuucswift.so.65 => /usr/lib/swift/linux/libicuucswift.so.65 (0x0000ffff89680000)
    libicui18nswift.so.65 => /usr/lib/swift/linux/libicui18nswift.so.65 (0x0000ffff89360000)
    libicudataswift.so.65 => /usr/lib/swift/linux/libicudataswift.so.65 (0x0000ffff878a0000)

    Version information:
    .build/release/Run:
        libc.so.6 (GLIBC_2.17) => /lib/aarch64-linux-gnu/libc.so.6
        libc.so.6 (GLIBC_2.34) => /lib/aarch64-linux-gnu/libc.so.6
        libm.so.6 (GLIBC_2.17) => /lib/aarch64-linux-gnu/libm.so.6
        libm.so.6 (GLIBC_2.29) => /lib/aarch64-linux-gnu/libm.so.6
    /usr/lib/swift/linux/libswiftCore.so:
        libc.so.6 (GLIBC_2.17) => /lib/aarch64-linux-gnu/libc.so.6
        libc.so.6 (GLIBC_2.34) => /lib/aarch64-linux-gnu/libc.so.6
        libc.so.6 (GLIBC_2.32) => /lib/aarch64-linux-gnu/libc.so.6
        libc.so.6 (GLIBC_2.33) => /lib/aarch64-linux-gnu/libc.so.6
        libm.so.6 (GLIBC_2.17) => /lib/aarch64-linux-gnu/libm.so.6
        libm.so.6 (GLIBC_2.29) => /lib/aarch64-linux-gnu/libm.so.6
        libm.so.6 (GLIBC_2.27) => /lib/aarch64-linux-gnu/libm.so.6
        libgcc_s.so.1 (GCC_3.0) => /lib/aarch64-linux-gnu/libgcc_s.so.1
        libgcc_s.so.1 (GCC_3.3) => /lib/aarch64-linux-gnu/libgcc_s.so.1
        libstdc++.so.6 (GLIBCXX_3.4.17) => /lib/aarch64-linux-gnu/libstdc++.so.6
        libstdc++.so.6 (CXXABI_1.3.11) => /lib/aarch64-linux-gnu/libstdc++.so.6
        libstdc++.so.6 (GLIBCXX_3.4.21) => /lib/aarch64-linux-gnu/libstdc++.so.6
        libstdc++.so.6 (GLIBCXX_3.4) => /lib/aarch64-linux-gnu/libstdc++.so.6
        libstdc++.so.6 (GLIBCXX_3.4.29) => /lib/aarch64-linux-gnu/libstdc++.so.6
        libstdc++.so.6 (GLIBCXX_3.4.18) => /lib/aarch64-linux-gnu/libstdc++.so.6
        libstdc++.so.6 (GLIBCXX_3.4.14) => /lib/aarch64-linux-gnu/libstdc++.so.6
        libstdc++.so.6 (CXXABI_1.3) => /lib/aarch64-linux-gnu/libstdc++.so.6
        ld-linux-aarch64.so.1 (GLIBC_2.17) => /lib/ld-linux-aarch64.so.1
    /usr/lib/swift/linux/libswift_Concurrency.so:
        libc.so.6 (GLIBC_2.17) => /lib/aarch64-linux-gnu/libc.so.6
        libc.so.6 (GLIBC_2.34) => /lib/aarch64-linux-gnu/libc.so.6
        libc.so.6 (GLIBC_2.32) => /lib/aarch64-linux-gnu/libc.so.6
        libstdc++.so.6 (GLIBCXX_3.4.11) => /lib/aarch64-linux-gnu/libstdc++.so.6
        libstdc++.so.6 (GLIBCXX_3.4) => /lib/aarch64-linux-gnu/libstdc++.so.6
        libstdc++.so.6 (CXXABI_1.3) => /lib/aarch64-linux-gnu/libstdc++.so.6
        libstdc++.so.6 (GLIBCXX_3.4.21) => /lib/aarch64-linux-gnu/libstdc++.so.6
        libstdc++.so.6 (GLIBCXX_3.4.18) => /lib/aarch64-linux-gnu/libstdc++.so.6
        libstdc++.so.6 (GLIBCXX_3.4.29) => /lib/aarch64-linux-gnu/libstdc++.so.6
        ld-linux-aarch64.so.1 (GLIBC_2.17) => /lib/ld-linux-aarch64.so.1
    /usr/lib/swift/linux/libswift_StringProcessing.so:
        libc.so.6 (GLIBC_2.17) => /lib/aarch64-linux-gnu/libc.so.6
        ld-linux-aarch64.so.1 (GLIBC_2.17) => /lib/ld-linux-aarch64.so.1
    /usr/lib/swift/linux/libswift_RegexParser.so:
        libc.so.6 (GLIBC_2.17) => /lib/aarch64-linux-gnu/libc.so.6
        ld-linux-aarch64.so.1 (GLIBC_2.17) => /lib/ld-linux-aarch64.so.1
    /usr/lib/swift/linux/libswiftGlibc.so:
        libc.so.6 (GLIBC_2.17) => /lib/aarch64-linux-gnu/libc.so.6
        libc.so.6 (GLIBC_2.34) => /lib/aarch64-linux-gnu/libc.so.6
        ld-linux-aarch64.so.1 (GLIBC_2.17) => /lib/ld-linux-aarch64.so.1
        libm.so.6 (GLIBC_2.17) => /lib/aarch64-linux-gnu/libm.so.6
        libm.so.6 (GLIBC_2.27) => /lib/aarch64-linux-gnu/libm.so.6
        libm.so.6 (GLIBC_2.35) => /lib/aarch64-linux-gnu/libm.so.6
    /usr/lib/swift/linux/libBlocksRuntime.so:
        libc.so.6 (GLIBC_2.17) => /lib/aarch64-linux-gnu/libc.so.6
    /usr/lib/swift/linux/libdispatch.so:
        libc.so.6 (GLIBC_2.33) => /lib/aarch64-linux-gnu/libc.so.6
        libc.so.6 (GLIBC_2.32) => /lib/aarch64-linux-gnu/libc.so.6
        libc.so.6 (GLIBC_2.34) => /lib/aarch64-linux-gnu/libc.so.6
        libc.so.6 (GLIBC_2.17) => /lib/aarch64-linux-gnu/libc.so.6
    /usr/lib/swift/linux/libswiftDispatch.so:
        libc.so.6 (GLIBC_2.17) => /lib/aarch64-linux-gnu/libc.so.6
        ld-linux-aarch64.so.1 (GLIBC_2.17) => /lib/ld-linux-aarch64.so.1
    /usr/lib/swift/linux/libFoundation.so:
        libc.so.6 (GLIBC_2.17) => /lib/aarch64-linux-gnu/libc.so.6
        libc.so.6 (GLIBC_2.34) => /lib/aarch64-linux-gnu/libc.so.6
        libc.so.6 (GLIBC_2.33) => /lib/aarch64-linux-gnu/libc.so.6
        libm.so.6 (GLIBC_2.35) => /lib/aarch64-linux-gnu/libm.so.6
        libm.so.6 (GLIBC_2.29) => /lib/aarch64-linux-gnu/libm.so.6
        libm.so.6 (GLIBC_2.17) => /lib/aarch64-linux-gnu/libm.so.6
        libgcc_s.so.1 (GCC_3.0) => /lib/aarch64-linux-gnu/libgcc_s.so.1
        libgcc_s.so.1 (GCC_3.3.1) => /lib/aarch64-linux-gnu/libgcc_s.so.1
        ld-linux-aarch64.so.1 (GLIBC_2.17) => /lib/ld-linux-aarch64.so.1
    /lib/aarch64-linux-gnu/libm.so.6:
        ld-linux-aarch64.so.1 (GLIBC_2.17) => /lib/ld-linux-aarch64.so.1
        libc.so.6 (GLIBC_PRIVATE) => /lib/aarch64-linux-gnu/libc.so.6
        libc.so.6 (GLIBC_2.17) => /lib/aarch64-linux-gnu/libc.so.6
    /lib/aarch64-linux-gnu/libc.so.6:
        ld-linux-aarch64.so.1 (GLIBC_PRIVATE) => /lib/ld-linux-aarch64.so.1
        ld-linux-aarch64.so.1 (GLIBC_2.17) => /lib/ld-linux-aarch64.so.1
    /lib/aarch64-linux-gnu/libstdc++.so.6:
        ld-linux-aarch64.so.1 (GLIBC_2.17) => /lib/ld-linux-aarch64.so.1
        libm.so.6 (GLIBC_2.17) => /lib/aarch64-linux-gnu/libm.so.6
        libc.so.6 (GLIBC_2.33) => /lib/aarch64-linux-gnu/libc.so.6
        libc.so.6 (GLIBC_2.25) => /lib/aarch64-linux-gnu/libc.so.6
        libc.so.6 (GLIBC_2.18) => /lib/aarch64-linux-gnu/libc.so.6
        libc.so.6 (GLIBC_2.32) => /lib/aarch64-linux-gnu/libc.so.6
        libc.so.6 (GLIBC_2.17) => /lib/aarch64-linux-gnu/libc.so.6
        libc.so.6 (GLIBC_2.34) => /lib/aarch64-linux-gnu/libc.so.6
        libgcc_s.so.1 (GCC_4.2.0) => /lib/aarch64-linux-gnu/libgcc_s.so.1
        libgcc_s.so.1 (GCC_3.3) => /lib/aarch64-linux-gnu/libgcc_s.so.1
        libgcc_s.so.1 (GCC_3.0) => /lib/aarch64-linux-gnu/libgcc_s.so.1
        libgcc_s.so.1 (GCC_4.5.0) => /lib/aarch64-linux-gnu/libgcc_s.so.1
    /lib/aarch64-linux-gnu/libgcc_s.so.1:
        libc.so.6 (GLIBC_2.35) => /lib/aarch64-linux-gnu/libc.so.6
        libc.so.6 (GLIBC_2.34) => /lib/aarch64-linux-gnu/libc.so.6
        libc.so.6 (GLIBC_2.17) => /lib/aarch64-linux-gnu/libc.so.6
    /usr/lib/swift/linux/libicuucswift.so.65:
        libgcc_s.so.1 (GCC_3.0) => /lib/aarch64-linux-gnu/libgcc_s.so.1
        libm.so.6 (GLIBC_2.29) => /lib/aarch64-linux-gnu/libm.so.6
        libm.so.6 (GLIBC_2.17) => /lib/aarch64-linux-gnu/libm.so.6
        libstdc++.so.6 (GLIBCXX_3.4.11) => /lib/aarch64-linux-gnu/libstdc++.so.6
        libstdc++.so.6 (CXXABI_1.3) => /lib/aarch64-linux-gnu/libstdc++.so.6
        libstdc++.so.6 (GLIBCXX_3.4.30) => /lib/aarch64-linux-gnu/libstdc++.so.6
        libstdc++.so.6 (GLIBCXX_3.4) => /lib/aarch64-linux-gnu/libstdc++.so.6
        libc.so.6 (GLIBC_2.34) => /lib/aarch64-linux-gnu/libc.so.6
        libc.so.6 (GLIBC_2.33) => /lib/aarch64-linux-gnu/libc.so.6
        libc.so.6 (GLIBC_2.17) => /lib/aarch64-linux-gnu/libc.so.6
    /usr/lib/swift/linux/libicui18nswift.so.65:
        libgcc_s.so.1 (GCC_3.0) => /lib/aarch64-linux-gnu/libgcc_s.so.1
        libstdc++.so.6 (CXXABI_1.3) => /lib/aarch64-linux-gnu/libstdc++.so.6
        libstdc++.so.6 (GLIBCXX_3.4) => /lib/aarch64-linux-gnu/libstdc++.so.6
        libm.so.6 (GLIBC_2.29) => /lib/aarch64-linux-gnu/libm.so.6
        libm.so.6 (GLIBC_2.17) => /lib/aarch64-linux-gnu/libm.so.6
        libc.so.6 (GLIBC_2.17) => /lib/aarch64-linux-gnu/libc.so.6
c++ swift docker perf ldd
1个回答
0
投票

解决方法

出于某种原因，

perf report
尝试查找附加有
 (deleted)
的可执行文件。创建名为 
<executable name> (deleted)
的已分析可执行文件的副本最终工作得很好。

更好的选择是创建二进制文件的符号链接，这样重新编译就不会导致别名过时。

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