linux-kernel - Re: [PATCH 1/3] perf timechart: implement IO mode

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Date:	Thu, 12 Jun 2014 09:59:29 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Stanislav Fomichev <stfomichev@...dex-team.ru>
Cc:	acme@...nel.org, artagnon@...il.com, jolsa@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] perf timechart: implement IO mode

Hi Stanislav,

On Tue, 10 Jun 2014 19:04:52 +0400, Stanislav Fomichev wrote:
> In IO mode timechart shows any disk/network activity.

[SNIP]
> +Record system-wide IO events:
> +
> +  $ perf timechart record -I

I got a segfault here:

  Core was generated by `perf timechart record -I'.
  Program terminated with signal 11, Segmentation fault.
  #0  parse_options_step (ctx=ctx@...ry=0x7fff6dcd8ef0, 
      options=options@...ry=0x587de0, usagestr=usagestr@...ry=0x588900)
      at util/parse-options.c:353
  353			if (*arg != '-' || !arg[1]) {
  Missing separate debuginfos, use: debuginfo-install glibc-2.17-9.fc20.x86_64 nss-softokn-freebl-3.15-1.fc20.x86_64 numactl-libs-2.0.7-6.fc17.x86_64
  (gdb) bt
  #0  parse_options_step (ctx=ctx@...ry=0x7fff6dcd8ef0, options=options@...ry=
      0x587de0, usagestr=usagestr@...ry=0x588900) at util/parse-options.c:353
  #1  0x0000000000465cf4 in parse_options_subcommand (argc=argc@...ry=197, 
      argv=argv@...ry=0x13fd6d0, options=options@...ry=0x587de0, 
      subcommands=subcommands@...ry=0x0, usagestr=usagestr@...ry=0x588900, 
      flags=flags@...ry=2) at util/parse-options.c:462
  #2  0x0000000000465f54 in parse_options (argc=argc@...ry=197, argv=argv@...ry=
      0x13fd6d0, options=options@...ry=0x587de0, usagestr=usagestr@...ry=
      0x588900, flags=flags@...ry=2) at util/parse-options.c:492
  #3  0x0000000000429ef8 in cmd_record (argc=argc@...ry=197, argv=argv@...ry=
      0x13fd6d0, prefix=prefix@...ry=0x0) at builtin-record.c:894
  #4  0x0000000000434c59 in timechart__io_record (argv=0x7fff6dcdc270, argc=0)
      at builtin-timechart.c:1756
  #5  cmd_timechart (argc=0, argv=0x7fff6dcdc270, prefix=<optimized out>)
      at builtin-timechart.c:1957
  #6  0x000000000041b603 in run_builtin (p=p@...ry=0x7fa230, argc=argc@...ry=3, 
      argv=argv@...ry=0x7fff6dcdc270) at perf.c:319
  #7  0x000000000041ae82 in handle_internal_command (argv=0x7fff6dcdc270, argc=3)
      at perf.c:376
  #8  run_argv (argv=0x7fff6dcdc060, argcp=0x7fff6dcdc06c) at perf.c:420
  #9  main (argc=3, argv=0x7fff6dcdc270) at perf.c:534


It was because, as I said, my system doesn't have pread64 syscall.. you
missed to decrease rec_argc when skipping invalid events. :)


> +
> +  then generate timechart:
> +
> +  $ perf timechart

After fixing the problem, I could run timechart and generate an
output.svg file.  But it doesn't show any IO activity.. process info was
there in grey boxes (rect.process3) but no color boxes.  I also tried
recording with ping and dd, but the result was same.  I suspect it's
because of some mis-calculation of position or size of the boxes.

Thanks,
Namhyung
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