[Xen-devel] Operf and Opreport outputs

[dhara buch <dharabuchphd@xxxxxxxxx>]

Hello,

Many days ago you had helped me a lot in using Oprofile in Virtual Machine. That time, I also had a query regarding getting information from 'opreport --symbols --debuginfo' command.

Actually, I am profiling a file1.c file with the following commands...

1. gcc -g file1.c -o file1

2. operf ./file1 --events=CPU_CLK_UNHALTED

3. opreport --symbols --debuginfo

the output contains various lines where one line look follows:

samples  %        linenr info                 image name               symbol name

2       12.5000  rsaimp.c:16                 rsaimp                   MM
2        12.5000  rsaimp.c:34                 rsaimp                   main

When I execute commands 2 and 3 multiple times, each time I gwt the output for symbole name MM (which is UDF in the program) but I don't get output for main every time.

Additionally,'' the sample % also vary every time I file operf command. I do not understand the working of operf that how it gives different outputs for the same program.

Thanks,

Dhara Buch

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