180b3d0626
perf inject overwrites feature sections with information from the current machine. It makes more sense to keep original information that describes the machine or software when perf record was run. Example: perf.data from "Desktop" injected on "nuc11" Before: $ perf script --header-only -i perf.data-from-desktop | head -15 # ======== # captured on : Thu May 19 09:55:50 2022 # header version : 1 # data offset : 1208 # data size : 837480 # feat offset : 838688 # hostname : Desktop # os release : 5.13.0-41-generic # perf version : 5.18.rc5.gac837f7ca7ed # arch : x86_64 # nrcpus online : 28 # nrcpus avail : 28 # cpudesc : Intel(R) Core(TM) i9-9940X CPU @ 3.30GHz # cpuid : GenuineIntel,6,85,4 # total memory : 65548656 kB $ perf inject -i perf.data-from-desktop -o injected-perf.data $ perf script --header-only -i injected-perf.data | head -15 # ======== # captured on : Fri May 20 15:06:55 2022 # header version : 1 # data offset : 1208 # data size : 837480 # feat offset : 838688 # hostname : nuc11 # os release : 5.17.5-local # perf version : 5.18.rc5.g0f828fdeb9af # arch : x86_64 # nrcpus online : 8 # nrcpus avail : 8 # cpudesc : 11th Gen Intel(R) Core(TM) i7-1165G7 @ 2.80GHz # cpuid : GenuineIntel,6,140,1 # total memory : 16012124 kB After: $ perf inject -i perf.data-from-desktop -o injected-perf.data $ perf script --header-only -i injected-perf.data | head -15 # ======== # captured on : Fri May 20 15:08:54 2022 # header version : 1 # data offset : 1208 # data size : 837480 # feat offset : 838688 # hostname : Desktop # os release : 5.13.0-41-generic # perf version : 5.18.rc5.gac837f7ca7ed # arch : x86_64 # nrcpus online : 28 # nrcpus avail : 28 # cpudesc : Intel(R) Core(TM) i9-9940X CPU @ 3.30GHz # cpuid : GenuineIntel,6,85,4 # total memory : 65548656 kB Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Acked-by: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Link: https://lore.kernel.org/r/20220520132404.25853-4-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.