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Fix spurious "backtraces skipped due to no file mapping" log entries

When using operf to do callgraph profiling, the following message may be
displayed:

WARNING: Lost samples detected! See .../oprofile_data/samples/operf.log for details.

And in the operf.log, you may see something like:

Nr. backtraces skipped due to no file mapping: 267

A bug in the code is causing most of these "no file mapping" counts.
This patch fixes that problem.

Signed-off-by: Maynard Johnson <maynardj@us.ibm.com>

Maynard Johnson Maynard Johnson 2013-11-14

changed libperf_events
changed libperf_events/operf_utils.cpp
libperf_events
Directory.
libperf_events/operf_utils.cpp Diff Switch to side-by-side view
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