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brendangregg
Stack trace visualizer
 As the graph showed above, here is three empty lines in the graph, what may cause this happen? Thanks for any help.
Hi, I have created a python script for parsing a squish report (js file). My script transfers the data from js/json file into a new csv file that can be...
Stackcollapse was detecting java programs correctly when profiling the process, but failing when --tid was used. Switched to matching start of string. Also, auto annotation caused double annotation (discovered when...
If you plot a differential flame graph against a white background it can look really weird if there's a lot of neutral frames, because they'll be totally white too. This...
Reproduce: ``` echo -e "#include\nint main(){printf(\"a\");}" > z.cpp g++ -g -O0 z.cpp -o t perf record -e "cpu-clock" -g -- ./t perf script -i perf.data > perf.unfold ./stackcollapse-perf.pl perf.unfold &>...
stackcollapse-bpftrace doesn't work for examples in the Systems Performance book when there is a comma in the output. ie: ``` bpftrace -e 't:exceptions:page_fault_user { @[ustack, comm] = count(); }' ```...
Motivation: `stackcollapse-perf` will both aggregate and collapse stacks. For flame graphs that's exactly right. Unforuntately, if you try to use `flamegraph.pl --flamechart`, then the automatic aggregation will stop you from...
Hi, I'm hoping you could shed some light on this issue I'm facing when profiling our application running on Xilinx Zynq UltraScale MPSoC processor (quad-core). In the attached XilinxZynq.avg you...
I have the output of stacktrace using the bcc profile tool. example: ``` longest_prefix_match.isra.0 longest_prefix_match.isra.0 trie_lookup_elem bpf_prog_00ede55654b88e81 cleanup_module tcf_classify __dev_queue_xmit ip_finish_output2 ip_output ip_send_skb udp_send_skb.isra.0 udp_sendmsg sock_sendmsg sock_write_iter new_sync_write vfs_write ksys_write...
