perf kvm无法打开[],继续没有符号

Question

我试图用perf kvm监视客户操作系统.我使用perf kvm record选项记录了性能,并使用perf kvm报告生成了报告.对于记录和报告,我使用的客户机操作系统kallsyms和模块作为解释在这里.

问题是,当我使用perf kvm报告生成报告时,很多"共享对象"都是未知的,因为perf kvm报告无法找到符号.下面是我运行报告时的终端输出.

root@computer1:/# perf kvm --guest --guestmodules=modules report -i perf.data --force > waste
Failed to open [ext4], continuing without symbols
Failed to open [jbd2], continuing without symbols
Failed to open [virtio_blk], continuing without symbols
Failed to open [dm_mod], continuing without symbols
Failed to open [virtio_pci], continuing without symbols
Failed to open [virtio_ring], continuing without symbols

下面是输出的一部分,我重定向到一个文件,你可以很容易地看到'未知'.

# To display the perf.data header info, please use --header/--header-only options.
#
#
# Total Lost Samples: 0
#
# Samples: 324K of event 'cycles'
# Event count (approx.): 181799817277
#
# Overhead  Command  Shared Object            Symbol                        
# ........  .......  .......................  ..............................
#
     1.30%  :28468   [unknown]                [u] 0x00007f3ae0262875        
     0.88%  :28468   [unknown]                [u] 0x00007f451f32d114        
     0.84%  :28468   [unknown]                [u] 0x00007f451f32d11d        
     0.49%  :28468   [unknown]                [u] 0x00007f451f32d118        
     0.45%  :28468   [guest.kernel.kallsyms]  [g] 0xffffffff8109aca3        
     0.43%  :28468   [unknown]                [u] 0x00007f3ae04c8891        
     0.42%  :28468   [guest.kernel.kallsyms]  [g] 0xffffffff810aa367        
     0.39%  :28468   [unknown]                [u] 0x000000343ca0a659        
     0.37%  :28468   [unknown]                [u] 0x00007f3ae04c8751        
     0.28%  :28468   [unknown]                [u] 0x000000343ca0b7c1        
     0.26%  :28468   [unknown]                [u] 0x000000343ca09223        
     0.25%  :28468   [unknown]                [u] 0x00007f451f32d116        
     0.23%  :28468   [unknown]                [u] 0x00007f3ae04c873e        
     0.21%  :28468   [guest.kernel.kallsyms]  [g] 0xffffffff8100c43f        
     0.20%  :28468   [unknown]                [u] 0x000000343ca09220        
     0.19%  :28468   [unknown]                [u] 0x00007f451f32d121        
     0.19%  :28468   [guest.kernel.kallsyms]  [g] 0xffffffff8100bb80        
     0.19%  :28468   [guest.kernel.kallsyms]  [g] 0xffffffff8150ffc2   

我在这里读到我需要安装dbgsym包,我完全不能理解.(注意:我不是Linux的新手,也不是专家).我也尝试在根文件夹中运行上面的命令,因为我在某处读到它可能是绝对路径等的问题但无济于事.

我想知道如何在perf kvm报告中解决这个未知问题.

谢谢

Answer 1

那么 RHEL 是您的主机，Ubuntu 是您的访客？

您可能已经知道，这些-dbgsym包是在编译时包含调试符号的。ubuntu wiki 有一个关于获取 -dbgsym.ddeb 软件包的页面，可能对您有用。还有一个关于调试 kvm 的页面，尽管它看起来不太有帮助。