From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Ahern <dsahern@gmail.com>
Subject: Re: --mmap-pages option seemingly has no effect to help with LOST
 samples
Date: Tue, 26 Jun 2012 14:16:37 -0600
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To: Maynard Johnson <maynardj@us.ibm.com>
Cc: linux-perf-users@vger.kernel.org, suka@us.ibm.com

On 6/25/12 8:10 AM, Maynard Johnson wrote:

> Just an FYI -- adding ":u" doesn't help for RHEL 6.2.  Thanks much for the help so far.
>

What kind of processor are you using and what is the output of:
dmesg |grep Perf

David