From mboxrd@z Thu Jan  1 00:00:00 1970
From: Hank <hankendi@gmail.com>
Subject: using perf lock
Date: Wed, 23 May 2012 15:42:42 +0000 (UTC)
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Hi,

I've been trying to use perf lock command on my Ubuntu 12.04, but I'm getting
this error:

invalid or unsupported event: 'lock:lock_acquire'

What might be the problem? Should I get the kernel source code? 

Thanks,