Re: [PATCH v4 14/18] perf tools: add new mem command for memoryaccess profiling

From: Stephane Eranian
Date: Mon Jan 07 2013 - 08:04:48 EST

On Wed, Jan 2, 2013 at 3:16 PM, Jiri Olsa <jolsa@xxxxxxxxxx> wrote:
> 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/, continuing without symbols
> Segmentation fault
> $ gdb ./perf
> GNU gdb (GDB) Fedora (
> Copyright (C) 2012 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later <>
> 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:
> <>...
> 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/".
> Detaching after fork from child process 3130.
> Failed to open /etc/, continuing without symbols
Can't reproduce this problem on my 3.8.0-rc1 patch series kernel, but
then I am not
using the same distro as you. Is your bin/ls statically linked and stripped?

> 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@entry=0x8a1c10, h=h@entry=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@entry=0x8a1c10, threaded=threaded@entry=false) at util/hist.c:639
> #5 0x000000000048e2de in hists__output_resort (hists=hists@entry=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@entry=0x89fd10, prefix=prefix@entry=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@entry=0x7bf768, argc=argc@entry=5, argv=argv@entry=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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