$ perf_3.4.0-6 report perf.data                                                                                                                                                                                       
Failed to open /tmp/perf-2494.map, continuing without symbols
[kernel.kallsyms] with build id f7be26570cc1d7798a54ca9414075d9bafda2f8f not found, continuing without symbols
# ========
# captured on: Tue Mar 22 14:21:39 2016
# hostname : ubuntu-phablet
# os release : 3.4.0-7-mako
# perf version : 3.4.0
# arch : armv7l
# nrcpus online : 4
# nrcpus avail : 2
# cpudesc : ARMv7 Processor rev 2 (v7l)
# total memory : 1878412 kB
# cmdline : /usr/bin/perf_3.4.0-6 record -p 2494 
# event : name = cycles, type = 0, config = 0x0, config1 = 0x0, config2 = 0x0, excl_usr = 0, excl_kern = 0, id = { 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73,
# ========
#
# Events: 6K cycles
#
# Overhead  Command  Shared Object  Symbol
# ........  .......  .............  ......
#


#
# (For a higher level overview, try: perf report --sort comm,dso)
#