perf on fedora 21

sudo yum install perf

[steve@steve-GA-880GMA-UD2H perf]$ pgrep iperf

2807

[steve@steve-GA-880GMA-UD2H perf]$ perf record -p 2807 -g

^C[ perf record: Woken up 26 times to write data ]

[nf_nat_ipv4] with build id 08e53c9cb720761011036c0f3f3d7db2feb62bc3 not found, continuing without symbols

[nf_conntrack] with build id 6b2d193426fa4e8a93181f77d0622c1425d23af9 not found, continuing without symbols

[iptable_mangle] with build id 3f487227e3da17d0386b8a8b6976ade8311bc0fd not found, continuing without symbols

[nf_conntrack_ipv4] with build id d872b229572d3106b3b415d24a83679191cfd58c not found, continuing without symbols

[iptable_nat] with build id 4a354a31abf978aacb65d3e7c53e13f421c6bdb9 not found, continuing without symbols

[nf_defrag_ipv4] with build id ed79015881b828ed986f78ee7fa06bb62ecf52f3 not found, continuing without symbols

[nf_nat] with build id 9135bac40d6819086edde4816d82c495bbc5640f not found, continuing without symbols

[radeon] with build id 7417d27e130d2e4eecb5d45cc08fb74b4eb003a5 not found, continuing without symbols

[drm] with build id b840649b8536d349cd1525af9dac7892f4b4f5d7 not found, continuing without symbols

[ perf record: Captured and wrote 6.551 MB perf.data (37928 samples) ]

[steve@steve-GA-880GMA-UD2H perf]$ perf report --stdio -g

# Children      Self  Command  Shared Object        Symbol                                         

# ........  ........  .......  ...................  ...............................................

#

    98.75%     0.00%  iperf    libpthread-2.20.so   [.] 0xffff80c11eca95fd                         

              |

              ---0xf5fd

                 |          

                 |--77.16%-- malloc

                 |          0x1d5

                 |          

                 |--15.29%-- Server::Run

                 |          

                 |--6.44%-- 0

                  --1.11%-- [...]

    98.56%     0.08%  iperf    [kernel.kallsyms]    [k] system_call_fastpath                       

              |

              ---system_call_fastpath

                 |          

                 |--99.89%-- 0xf5fd

                 |          |          

                 |          |--78.04%-- malloc

                 |          |          0x1d5

can't get report/annotate to show file/line

maybe related to ?

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=661193

OK...
I could get it to work by building iperf with
CXXFLAGS='-g3 -gdwarf-2' CFLAGS='-g3 -gdwarf-2'

then some work to understand how threads are represented