[lkml]   [2011]   [Aug]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    Subject[PATCH -tip v3 0/5] perf script: add BTS analysis features
    Hi Frederic, David,

    This patch series adds the functions to analyze BTS logs to perf-script and,
    makes perf-script more informative version 3.
    The patches add the following functions.
    - Unify the expression to "[unknown]"
    - Fix BTS record header to resolve DSOs and symbols of user-space
    - Resolve DSOs and symbols for BTS's branch_from addresses
    - Show the offset of symbols with the 'offs' field specifier.
    - Resolve the real path of [kernel.kallsym] using
    '--show-kernel-path' option.

    First, get the BTS log with the following command.
    # perf record -e branches:u -c 1 -d <command>

    Second, analyze that trace data.
    # perf script -f ip,addr,sym,offs,dso [--show-kernel-path]
    This command's output format is:
    <branch_to addr> <branch_to function+offset> <branch_to DSO> <branch_from addr> <branch_from function+offset> <branch_from DSO>

    Output sample:
    # perf record -e branches:u -c 1 -d ls
    # perf script -f ip,addr,sym,dso,offs --show-kernel-path

    34308016b0 _start+0x0 (/lib64/ ffffffff81465a6d irq_return+0x0 (/lib/modules/3.0.0+/build/vmlinux)
    34308016b0 _start+0x0 (/lib64/ ffffffff81465a6d irq_return+0x0 (/lib/modules/3.0.0+/build/vmlinux)
    3430804b80 _dl_start+0x0 (/lib64/ 34308016b3 _start+0x3 (/lib64/
    3430804b80 _dl_start+0x0 (/lib64/ ffffffff81465a6d irq_return+0x0 (/lib/modules/3.0.0+/build/vmlinux)
    3430804ba6 _dl_start+0x26 (/lib64/ ffffffff81465a6d irq_return+0x0 (/lib/modules/3.0.0+/build/vmlinux)
    3430804bad _dl_start+0x2d (/lib64/ ffffffff81465a6d irq_return+0x0 (/lib/modules/3.0.0+/build/vmlinux)
    3430804c1d _dl_start+0x9d (/lib64/ 3430804bfb _dl_start+0x7b (/lib64/
    3430804c00 _dl_start+0x80 (/lib64/ 3430804c21 _dl_start+0xa1 (/lib64/
    401fd0 main+0x0 (/root/bin/ls) 3430c21399 __libc_start_main+0xe9 (/lib64/
    409ad0 set_program_name+0x0 (/root/bin/ls) 401ff3 main+0x23 (/root/bin/ls)
    409ad0 set_program_name+0x0 (/root/bin/ls) ffffffff81465a6d irq_return+0x0 (/lib/modules/3.0.0+/build/vmlinux)
    401ca8 strrchr@plt+0x0 (/root/bin/ls) 409ade set_program_name+0xe (/root/bin/ls)
    401cae strrchr@plt+0x6 (/root/bin/ls) 401ca8 strrchr@plt+0x0 (/root/bin/ls)
    401a38 _init+0x18 (/root/bin/ls) 401cb3 strrchr@plt+0xb (/root/bin/ls)
    3430813850 _dl_runtime_resolve+0x0 (/lib64/ 401a3e _init+0x1e (/root/bin/ls)

    It shows the tracee application's execution path.

    - add source code path field, line number field ...etc.
    - add record/report script to use easily and, show human-friendly output.
    - filtering kernel functions using scripts

    Changes in v3:
    - remove the bug fix patch already fixed.
    - unify the "[unknown]" expressions in perf-script.
    - fix perf_event_header of BTS events.
    - fix patch's descriptions

    Changes in v2:
    - add a bug fix patch that prints correct IP address
    - output the magic word "(unknown)" as symbol name when perf-script can't
    resolve symbols.
    - output "[unknown]" as DSO name when perf-script can't resolve DSO path.
    - change the way to output offset of symbols from '--show-symbol-offset' to
    'offs' field.
    - clean up codes.



    Akihiro Nagai (5):
    perf script: add option resolving vmlinux path
    perf script: add the offset field specifier
    perf script: enhance IP and ADDR correlate detection for BTS
    perf: change perf_event_header.misc to PERF_RECORD_MISC_USER for BTS
    perf-script: unify the expressions indicate "unknown"

    arch/x86/kernel/cpu/perf_event_intel_ds.c | 8 +++++
    tools/perf/Documentation/perf-script.txt | 5 +++
    tools/perf/builtin-script.c | 44 +++++++++++++++++++----------
    tools/perf/util/map.c | 15 ++++++++++
    tools/perf/util/map.h | 1 +
    tools/perf/util/session.c | 38 +++++++++----------------
    tools/perf/util/session.h | 3 +-
    tools/perf/util/symbol.c | 20 +++++++++++++
    tools/perf/util/symbol.h | 4 +++
    9 files changed, 96 insertions(+), 42 deletions(-)

    Akihiro Nagai (

     \ /
      Last update: 2011-08-11 14:07    [W:0.457 / U:2.988 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site