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SubjectRe: [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

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