Question

I got a virtual machine running Ubuntu 12.04 with linux kernel 3.2.0-31. When I try to run the sudo perf top command, which can profile the entire system's processes and gather their information, none of the information shows up. But other commands runs fine, like perf stat ls that collects all performance info running ls command.

screenshot

So I am wondering : is that because perf top command does not support virtual machine? Any ideas?

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