linux-kernel - Re: [PATCH v4 14/18] perf tools: add new mem command for memory access profiling

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Date:	Wed, 2 Jan 2013 15:16:01 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
	ak@...ux.intel.com, acme@...hat.com, namhyung.kim@....com
Subject: Re: [PATCH v4 14/18] perf tools: add new mem command for memory
 access profiling

On Thu, Dec 20, 2012 at 04:41:44PM +0100, Stephane Eranian wrote:
> This new command is a wrapper on top of perf record and
> perf report to make it easier to configure for memory
> access profiling.
> 
> To record loads:
> $ perf mem -t load rec .....
> 
> To record stores:
> $ perf mem -t store rec .....
> 
> To get the report:
> $ perf mem -t load rep

I get following segfault occasionally:

  $ perf mem -t load rec ls
  $ perf mem -t load rep --stdio
    Failed to open /etc/ld.so.cache, continuing without symbols
    Segmentation fault
  $ gdb ./perf
  GNU gdb (GDB) Fedora (7.4.50.20120120-52.fc17)
  Copyright (C) 2012 Free Software Foundation, Inc.
  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
  This is free software: you are free to change and redistribute it.
  There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
  and "show warranty" for details.
  This GDB was configured as "x86_64-redhat-linux-gnu".
  For bug reporting instructions, please see:
  <http://www.gnu.org/software/gdb/bugs/>...
  Reading symbols from /home/jolsa/kernel/tip-local/tools/perf/perf...done.
  (gdb) r  mem -t load rep --stdio
  Starting program: /home/jolsa/kernel/tip-local/tools/perf/perf mem -t load rep --stdio
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib64/libthread_db.so.1".
  Detaching after fork from child process 3130.
  Failed to open /etc/ld.so.cache, continuing without symbols

  Program received signal SIGSEGV, Segmentation fault.
  dso__name_len (dso=0x68100142) at util/dso.c:389
  389             return dso->short_name_len;
  Missing separate debuginfos, use: debuginfo-install atk-2.4.0-1.fc17.x86_64 audit-libs-2.2.1-1.fc17.x86_64 bzip2-libs-1.0.6-4.fc17.x86_64 cairo-1.10.2-7.fc17.x86_64 elfutils-libelf-0.154-2.fc17.x86_64 elfutils-libs-0.154-2.fc17.x86_64 expat-2.1.0-1.fc17.x86_64 fontconfig-2.8.0-8.fc17.x86_64 freetype-2.4.8-3.fc17.x86_64 gdk-pixbuf2-2.26.1-1.fc17.x86_64 glib2-2.32.4-2.fc17.x86_64 glibc-2.15-58.fc17.x86_64 gtk2-2.24.13-1.fc17.x86_64 libX11-1.5.0-2.fc17.x86_64 libXau-1.0.6-3.fc17.x86_64 libXcomposite-0.4.3-3.fc17.x86_64 libXcursor-1.1.13-1.fc17.x86_64 libXdamage-1.1.3-3.fc17.x86_64 libXext-1.3.1-1.fc17.x86_64 libXfixes-5.0-2.fc17.x86_64 libXi-1.6.1-1.fc17.x86_64 libXinerama-1.1.2-1.fc17.x86_64 libXrandr-1.3.1-3.fc17.x86_64 libXrender-0.9.7-1.fc17.x86_64 libffi-3.0.10-2.fc17.x86_64 libgcc-4.7.2-2.fc17.x86_64 libpng-1.5.10-1.fc17.x86_64 libselinux-2.1.10-3.fc17.x86_64 libunwind-1.0.1-3.fc17.x86_64 libxcb-1.9-1.fc17.x86_64 newt-0.52.14-2.fc17.x86_64 numactl-libs-2.0.7-6.fc17.x86_64 pango-1.30.0-1.fc17.x86_64 pixman-0.24.4-2.fc17.x86_64 python-libs-2.7.3-7.2.fc17.x86_64 slang-2.2.4-3.fc17.x86_64 xz-libs-5.1.2-1alpha.fc17.x86_64 zlib-1.2.5-7.fc17.x86_64
  (gdb) bt
  #0  dso__name_len (dso=0x68100142) at util/dso.c:389
  #1  0x000000000048d8cd in hists__calc_col_len (hists=hists@...ry=0x8a1c10, h=h@...ry=0xd7de50) at util/hist.c:130
  #2  0x000000000048dc47 in hists__inc_nr_entries (h=0xd7de50, hists=0x8a1c10) at util/hist.c:285
  #3  hists__inc_nr_entries (h=0xd7de50, hists=0x8a1c10) at util/hist.c:613
  #4  __hists__output_resort (hists=hists@...ry=0x8a1c10, threaded=threaded@...ry=false) at util/hist.c:639
  #5  0x000000000048e2de in hists__output_resort (hists=hists@...ry=0x8a1c10) at util/hist.c:645
  #6  0x0000000000436240 in __cmd_report (rep=0x7fffffffd330) at builtin-report.c:521
  #7  cmd_report (argc=<optimized out>, argv=argv@...ry=0x89fd10, prefix=prefix@...ry=0x0) at builtin-report.c:888
  #8  0x0000000000449e30 in report_events (mem=0x7fffffffde90, argv=0x7fffffffe4a0, argc=<optimized out>) at builtin-mem.c:182
  #9  cmd_mem (argc=<optimized out>, argv=0x7fffffffe4a0, prefix=<optimized out>) at builtin-mem.c:233
  #10 0x00000000004191d3 in run_builtin (p=p@...ry=0x7bf768, argc=argc@...ry=5, argv=argv@...ry=0x7fffffffe4a0) at perf.c:319
  #11 0x0000000000418976 in handle_internal_command (argv=0x7fffffffe4a0, argc=5) at perf.c:367
  #12 run_argv (argv=0x7fffffffe290, argcp=0x7fffffffe29c) at perf.c:411
  #13 main (argc=5, argv=0x7fffffffe4a0) at perf.c:513


jirka
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