linux-kernel - Re: [PATCH] perf, tools: Support srccode output

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Date:   Wed, 5 Dec 2018 18:05:26 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Andi Kleen <andi@...stfloor.org>, jolsa@...nel.org,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH] perf, tools: Support srccode output

On Wed, Dec 05, 2018 at 01:54:30PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Wed, Dec 05, 2018 at 01:28:38PM +0100, Jiri Olsa escreveu:
> > On Mon, Dec 03, 2018 at 04:18:48PM -0800, Andi Kleen wrote:
> > > From: Andi Kleen <ak@...ux.intel.com>
> > > 
> > > When looking at PT or brstackinsn traces with perf script
> > > it can be very useful to see the source code. This adds a simple
> > > facility to print them with perf script, if the information
> > > is available through dwarf
> > > 
> > > % perf record ...
> > > % perf script -F insn,ip,sym,srccode
> > > ...
> > > 
> > >           4004c6 main
> > > 5               for (i = 0; i < 10000000; i++)
> > >            4004cd main
> > > 5               for (i = 0; i < 10000000; i++)
> > >            4004c6 main
> > > 5               for (i = 0; i < 10000000; i++)
> > >            4004cd main
> > > 5               for (i = 0; i < 10000000; i++)
> > >            4004cd main
> > > 5               for (i = 0; i < 10000000; i++)
> > >            4004cd main
> > > 5               for (i = 0; i < 10000000; i++)
> > >            4004cd main
> > > 5               for (i = 0; i < 10000000; i++)
> > >            4004cd main
> > > 5               for (i = 0; i < 10000000; i++)
> > >            4004b3 main
> > > 6                       v++;
> > > 
> > > % perf record -b ...
> > > % perf script -F insn,ip,sym,srccode,brstackinsn
> > > 
> > > ...
> > >        main+22:
> > >         0000000000400543        insn: e8 ca ff ff ff            # PRED
> > > |18                     f1();
> > >         f1:
> > >         0000000000400512        insn: 55
> > > |10       {
> > >         0000000000400513        insn: 48 89 e5
> > >         0000000000400516        insn: b8 00 00 00 00
> > > |11             f2();
> > >         000000000040051b        insn: e8 d6 ff ff ff            # PRED
> > >         f2:
> > >         00000000004004f6        insn: 55
> > > |5        {
> > >         00000000004004f7        insn: 48 89 e5
> > >         00000000004004fa        insn: 8b 05 2c 0b 20 00
> > > |6              c = a / b;
> > >         0000000000400500        insn: 8b 0d 2a 0b 20 00
> > >         0000000000400506        insn: 99
> > >         0000000000400507        insn: f7 f9
> > >         0000000000400509        insn: 89 05 29 0b 20 00
> > >         000000000040050f        insn: 90
> > > |7        }
> > >         0000000000400510        insn: 5d
> > >         0000000000400511        insn: c3                        # PRED
> > >         f1+14:
> > >         0000000000400520        insn: b8 00 00 00 00
> > > |12             f2();
> > >         0000000000400525        insn: e8 cc ff ff ff            # PRED
> > >         f2:
> > >         00000000004004f6        insn: 55
> > > |5        {
> > >         00000000004004f7        insn: 48 89 e5
> > >         00000000004004fa        insn: 8b 05 2c 0b 20 00
> > > |6              c = a / b;
> > > 
> > > Not supported for callchains currently, would need some
> > > layout changes there.
> > 
> > nice, works nicely, especialy with --xed
> 
> The above seems to imply you actually tested it, was that the case? Can
> you please provide me the exact 'perf record' line you used, that is
> lacking in Andi's original commit log message?

yep..

  # ./perf record -e intel_pt//u -- ./perf

jirka