mirror of
https://github.com/torvalds/linux.git
synced 2026-08-02 05:12:01 +02:00
Linux kernel source tree
3116d60910
By default, perf sched map prints sched-in events for all the tasks which may not be required all the time as it prints lot of symbols and rows to the terminal. With --task-name option, one could specify the specific task name for which the map has to be shown. This would help in analyzing the CPU usage patterns easier for that specific task. Since multiple PID's might have the same task name, using task-name filter would be more useful for debugging. For other tasks, instead of printing the symbol, '-' is printed and the same '.' is used to represent idle. '-' is used instead of symbol for other tasks because it helps in clear visualization of task of interest and secondly the symbol itself doesn't mean anything because the sched-in of that symbol will not be printed(first sched-in contains pid and the corresponding symbol). When using the --task-name option, the sched-out time is represented by a '*-'. Since not all task sched-in events are printed, the sched-out time of the relevant task might be lost. This representation ensures that the sched-out time of the interested task is not overlooked. 6.10.0-rc1 ========== *A0 131040.639793 secs A0 => migration/0:19 *. 131040.639801 secs . => swapper:0 . *B0 131040.639830 secs B0 => migration/1:24 . *. 131040.639836 secs . . *C0 131040.640108 secs C0 => migration/2:30 . . *. 131040.640163 secs . . . *D0 131040.640386 secs D0 => migration/3:36 . . . *. 131040.640395 secs 6.10.0-rc1 + patch (--task-name wdavdaemon) ============= . *A0 . . . . - . 131040.641346 secs A0 => wdavdaemon:62509 . A0 *B0 . . . - . 131040.641378 secs B0 => wdavdaemon:62274 - *- B0 . . . - . 131040.641379 secs *C0 . B0 . . . . . 131040.641572 secs C0 => wdavdaemon:62283 C0 . B0 . *D0 . . . 131040.641572 secs D0 => wdavdaemon:62277 C0 . B0 . D0 . *E0 . 131040.641578 secs E0 => wdavdaemon:62270 *- . B0 . D0 . E0 . 131040.641581 secs . . B0 . D0 . *- . 131040.641583 secs Reviewed-and-tested-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com> Signed-off-by: Madadi Vineeth Reddy <vineethr@linux.ibm.com> Cc: Chen Yu <yu.c.chen@intel.com> Link: https://lore.kernel.org/r/20240707182716.22054-2-vineethr@linux.ibm.com Signed-off-by: Namhyung Kim <namhyung@kernel.org> |
||
|---|---|---|
| arch | ||
| block | ||
| 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 | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .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.