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The perf record testcase fails on systems with more than 1K CPUs. Testcase: perf test -vv "PERF_RECORD_* events & perf_sample fields" PERF_RECORD_* events & perf_sample fields : --- start --- test child forked, pid 272482 sched_getaffinity: Invalid argument sched__get_first_possible_cpu: Invalid argument test child finished with -1 ---- end ---- PERF_RECORD_* events & perf_sample fields: FAILED! sched__get_first_possible_cpu uses "sched_getaffinity" to get the cpumask and this call is returning EINVAL (Invalid argument). This happens because the default mask size in glibc is 1024. To overcome this 1024 CPUs mask size limitation of cpu_set_t, change the mask size using the CPU_*_S macros ie, use CPU_ALLOC to allocate cpumask, CPU_ALLOC_SIZE for size. Same fix needed for mask which is used to setaffinity so that mask size is large enough to represent number of possible CPU's in the system. Reported-by: Tejas Manhas <tejas05@linux.ibm.com> Signed-off-by: Athira Rajeev <atrajeev@linux.ibm.com> Tested-by: Ian Rogers <irogers@google.com> Tested-by: Tejas Manhas <tejas05@linux.ibm.com> Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com> Acked-by: Namhyung Kim <namhyung@kernel.org> Cc: Aditya Bodkhe <Aditya.Bodkhe1@ibm.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Hari Bathini <hbathini@linux.vnet.ibm.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Kajol Jain <kjain@linux.ibm.com> Cc: Madhavan Srinivasan <maddy@linux.ibm.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> |
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| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .pylintrc | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
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 reStructuredText 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.