linux-kernel - Re: perf script doesn't dump a normal call trace

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Date:   Mon, 5 Nov 2018 09:49:06 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Xin Long <lucien.xin@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        linux-perf-users@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>
Subject: Re: perf script doesn't dump a normal call trace

On Mon, Nov 05, 2018 at 03:20:15PM +0900, Xin Long wrote:

SNIP

> > > > [root@...-x3650m4-02 perf]# ./perf probe 'consume_skb'
> > > > [root@...-x3650m4-02 perf]# ./perf record -g -e probe:consume_skb* -aR ^C
> > > >
> > > Thanks Jiri,
> > >
> > > My debugging script is using tracepoint with some filters which I
> > > don't think probe can support.
> > > Any one have fixes for this tracepoint issue?
> >
> > trying to bisect that.. looks like orc code issue,
> > it works for me when you switch to fp unwind:
> >   CONFIG_UNWINDER_FRAME_POINTER
> >
> 
> That's a good workaround, thanks.
> 
> Another problem is when I'm using perf built manually from upstream kernel tree,
> I couldn't see the function's names.
> # perf --version
> perf version 4.19.g26f1de
> 
> # perf report -T
> # To display the perf.data header info, please use
> --header/--header-only options.
> #
> #
> # Total Lost Samples: 0
> #
> # Samples: 97  of event 'probe:consume_skb'
> # Event count (approx.): 97
> #
> # Children      Self  Trace output
> # ........  ........  ..................
> #
>    100.00%   100.00%  (ffffffff86f090f0)
>             |
>             |--93.81%--0xffffffff868000e6
>             |          0xffffffff8684ed7f
>             |          0xffffffff868e97ad
>             |          0xffffffff868e953a
>             |          0xffffffff87087623
>             |          0xffffffff8682a06f
>             |          0xffffffff870872ad
>             |          |
>             |          |--89.69%--0xffffffff8720098f
>             |          |          0xffffffff87201b69
>             |          |          0xffffffff868b9c2e
> 
> 
> The below is with rhel7's perf
> # perf --version
> perf version 3.10.0-957.el7.x86_64.debug
> # perf report -T
> # To display the perf.data header info, please use
> --header/--header-only options.
> #
> #
> # Total Lost Samples: 0
> #
> # Samples: 97  of event 'probe:consume_skb'
> # Event count (approx.): 97
> #
> # Children      Self  Trace output
> # ........  ........  ..................
> #
>    100.00%   100.00%  (ffffffff86f090f0)
>             |
>             |--93.81%--0x2000e6
>             |          start_secondary
>             |          cpu_startup_entry
>             |          do_idle
>             |          default_idle_call
>             |          arch_cpu_idle
>             |          default_idle
>             |          |
>             |          |--89.69%--ret_from_intr
>             |          |          do_IRQ
>             |          |          irq_exit

I think that's already fixed on Arnaldo's perf/urgent branch,
  git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git

but perhaps this post as well:
  https://lore.kernel.org/lkml/20181031091043.23465-1-adrian.hunter@intel.com/

please give it a try.. it should be merged in soon

jirka