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Rick
Rick

Reputation: 949

Why does the command "perf list" produce different outputs on the same version RedHat Linux?

I got two RedHat Linux machine with the same OS version, but for the command perf list, it produces different outputs.

The first machine:

cat /proc/version

Linux version 2.6.32-279.11.1.el6.x86_64 ([email protected]) (gcc version 4.4.6 20120305 (Red Hat 4.4.6-4) (GCC) ) #1 SMP Tue Oct 16 08:03:36 PDT 2012

perf --version

perf version 3.0.36-300.17.1.el6uek.x86_64

On this machine, perf list couldn't list out any tracepoint events.

The second machine:

cat /proc/version

Linux version 2.6.32-279.11.1.el6.x86_64 ([email protected]) (gcc version 4.4.6 20120305 (Red Hat 4.4.6-4) (GCC) ) #1 SMP Tue Oct 16 08:03:36 PDT 2012

perf --version

perf version 3.0.36-300.17.1.el6uek.x86_64

On this machine, perf list could list out all events

Upvotes: 1

Views: 107

Answers (1)

Milind Dumbare
Milind Dumbare

Reputation: 3244

May be the first machine has no tracepoint support.

For the tracepoint events you will need to have debugfs mounted first, e.g. 

mount -t debugfs none /dbg

And you might also need ftrace enabled in kernel.

Upvotes: 1

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