linux-kernel - Re: [PATCH 0/5] perf record: Put a copy of kcore into the perf.data directory

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Date:   Mon, 21 Oct 2019 11:36:25 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Jiri Olsa <jolsa@...hat.com>, Namhyung Kim <namhyung@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/5] perf record: Put a copy of kcore into the perf.data
 directory

Em Fri, Oct 04, 2019 at 11:31:16AM +0300, Adrian Hunter escreveu:
> Hi
> 
> Here are patches to add a new 'perf record' option '--kcore' which will put
> a copy of /proc/kcore, kallsyms and modules into a perf.data directory.
> Note, that without the --kcore option, output goes to a file as previously.
> The tools' -o and -i options work with either a file name or directory
> name.

Its great that you two got in agreement about adding the new feature
using the infrastructure that is being put in place for perf.data as a
directory, great team work.

Applied, thanks a lot,

- Arnaldo
 
> Example:
> 
>  $ sudo perf record --kcore uname
> 
>  $ sudo tree perf.data
>  perf.data
>  ├── kcore_dir
>  │   ├── kallsyms
>  │   ├── kcore
>  │   └── modules
>  └── data
> 
>  $ sudo perf script -v
>  build id event received for vmlinux: 1eaa285996affce2d74d8e66dcea09a80c9941de
>  build id event received for [vdso]: 8bbaf5dc62a9b644b4d4e4539737e104e4a84541
>  Samples for 'cycles' event do not have CPU attribute set. Skipping 'cpu' field.
>  Using CPUID GenuineIntel-6-8E-A
>  Using perf.data/kcore_dir/kcore for kernel data
>  Using perf.data/kcore_dir/kallsyms for symbols
>              perf 19058 506778.423729:          1 cycles:  ffffffffa2caa548 native_write_msr+0x8 (vmlinux)
>              perf 19058 506778.423733:          1 cycles:  ffffffffa2caa548 native_write_msr+0x8 (vmlinux)
>              perf 19058 506778.423734:          7 cycles:  ffffffffa2caa548 native_write_msr+0x8 (vmlinux)
>              perf 19058 506778.423736:        117 cycles:  ffffffffa2caa54a native_write_msr+0xa (vmlinux)
>              perf 19058 506778.423738:       2092 cycles:  ffffffffa2c9b7b0 native_apic_msr_write+0x0 (vmlinux)
>              perf 19058 506778.423740:      37380 cycles:  ffffffffa2f121d0 perf_event_addr_filters_exec+0x0 (vmlinux)
>             uname 19058 506778.423751:     582673 cycles:  ffffffffa303a407 propagate_protected_usage+0x147 (vmlinux)
>             uname 19058 506778.423892:    2241841 cycles:  ffffffffa2cae0c9 unwind_next_frame.part.5+0x79 (vmlinux)
>             uname 19058 506778.424430:    2457397 cycles:  ffffffffa3019232 check_memory_region+0x52 (vmlinux)
> 
> 
> Adrian Hunter (5):
>       perf data: Correctly identify directory data files
>       perf data: Move perf_dir_version into data.h
>       perf data: Rename directory "header" file to "data"
>       perf tools: Support single perf.data file directory
>       perf record: Put a copy of kcore into the perf.data directory
> 
>  tools/perf/Documentation/perf-record.txt           |  3 ++
>  .../Documentation/perf.data-directory-format.txt   | 63 ++++++++++++++++++++++
>  tools/perf/builtin-record.c                        | 54 ++++++++++++++++++-
>  tools/perf/util/data.c                             | 46 ++++++++++++++--
>  tools/perf/util/data.h                             | 12 +++++
>  tools/perf/util/header.h                           |  4 --
>  tools/perf/util/record.h                           |  1 +
>  tools/perf/util/session.c                          |  4 ++
>  tools/perf/util/util.c                             | 19 ++++++-
>  9 files changed, 197 insertions(+), 9 deletions(-)
>  create mode 100644 tools/perf/Documentation/perf.data-directory-format.txt
> 
> 
> Regards
> Adrian

-- 

- Arnaldo