Will you add support for perf record logs ?

[ampresent]

A sample:

swapper     0 [002] 269487.939345:   63788766 cycles:                                                                                                                                                                                                                      ┤
            7fff810bcda8 set_next_entity ([kernel.kallsyms])                                                                                                                                                                                                               ┤
            7fff810c1d97 pick_next_task_fair ([kernel.kallsyms])                                                                                                                                                                                                           ┤
            7fff8164481b __schedule ([kernel.kallsyms])                                                                                                                                                                                                                    ┤
            7fff81646329 schedule_preempt_disabled ([kernel.kallsyms])                                                                                                                                                                                                     ┤
            7fff810d8554 cpu_startup_entry ([kernel.kallsyms])                                                                                                                                                                                                             ┤
            7fff8104a40a start_secondary ([kernel.kallsyms])                                                                                                                                                                                                               ┤
                                                                                                                                                                                                                                                                           ┤
netperf 78892 [000] 269487.956142:   55073703 cycles:                                                                                                                                                                                                                      ┤
            7fff81172788 get_pageblock_flags_group ([kernel.kallsyms])                                                                                                                                                                                                     ┤
            7fff81173ca8 __free_pages_ok.part.60 ([kernel.kallsyms])                                                                                                                                                                                                       ┤
            7fff81173d28 free_compound_page ([kernel.kallsyms])                                                                                                                                                                                                            ┤
            7fff811799cf __put_compound_page ([kernel.kallsyms])                                                                                                                                                                                                           ┤
            7fff81179a41 put_compound_page ([kernel.kallsyms])                                                                                                                                                                                                             ┤
            7fff81179bac put_page ([kernel.kallsyms])                                                                                                                                                                                                                      ┤
            7fff815237e8 skb_release_data ([kernel.kallsyms])                                                                                                                                                                                                              ┤
            7fff81523894 skb_release_all ([kernel.kallsyms])                                                                                                                                                                                                               ┤
            7fff815238b2 __kfree_skb ([kernel.kallsyms])                                                                                                                                                                                                                   ┤
            7fff81588d8c tcp_ack ([kernel.kallsyms])                                                                                                                                                                                                                       ┤
            7fff81589f98 tcp_rcv_established ([kernel.kallsyms])                                                                                                                                                                                                           ┤
            7fff8159497a tcp_v4_do_rcv ([kernel.kallsyms])                                                                                                                                                                                                                 ┤
            7fff8151e901 release_sock ([kernel.kallsyms])                                                                                                                                                                                                                  ┤
            7fff81580c66 tcp_sendmsg ([kernel.kallsyms])                                                                                                                                                                                                                   ┤
            7fff815ab1e4 inet_sendmsg ([kernel.kallsyms])                                                                                                                                                                                                                  ┤
            7fff8151a340 sock_sendmsg ([kernel.kallsyms])                                                                                                                                                                                                                  ┤
            7fff8151a8b1 SYSC_sendto ([kernel.kallsyms])                                                                                                                                                                                                                   ┤
            7fff8151b33e sys_sendto ([kernel.kallsyms])                                                                                                                                                                                                                    ┤
            7fff81650289 system_call_fastpath ([kernel.kallsyms])                                                                                                                                                                                                          ┤
                   ffb6d __libc_send (/usr/lib64/libc-2.17.so)                                                                                                                                                                                                             ┤
                   1a41f send_omni_inner (/home/yihao.wyh/netperf/bin/netperf)                                                                                                                                                                                             ┤
                   1cd85 send_tcp_stream (/home/yihao.wyh/netperf/bin/netperf)                                                                                                                                                                                             ┤
                    2522 main (/home/yihao.wyh/netperf/bin/netperf)                                                                                                                                                                                                        ┤
                   22445 __libc_start_main (/usr/lib64/libc-2.17.so)                                                                                                                                                                                                       ┤

[tstack]

Can you point me at a detailed description of the format? I can't quite tell what's what at the moment.

For example, is "269487.939345" a timestamp? Is it seconds from boot time?

[ampresent]

Yes, "269487.939345" is uptime.

I find that lnav don't recognize uptime well. Since that, I think adding interface for users to help lnav recognize time with regex or something might be useful too.

Another thing comes to me is that, in the sample I give, there are call stacks. How do I do some analyzation over the call stacks ? Maybe this logging isn't so structured so we'd better not take it as a log file in the first place ?

Thanks!