b6d47165f3
Fix the abnormal CPU usage statistics issue caused by missing update
of run_start timestamp in the target task (to) TCB when the CPU load
counting mode is SCHED_CPULOAD_CRITMONITOR.
Before this fix, the to->run_start was not set when switching context,
leading to incorrect CPU usage calculation (e.g., Idle_Task showed 52.9%
CPU usage instead of 100%, and running tasks had wrong non-zero values).
After fixing, the CPU statistics return to normal: Idle_Task correctly
shows 100% usage, and non-running tasks show 0% as expected.
Enable:
+CONFIG_SCHED_CPULOAD_CRITMONITOR=y
+CONFIG_SCHED_CRITMONITOR=y
Before:
nsh> ps
TID PID PPID PRI POLICY TYPE NPX STATE EVENT SIGMASK STACK CPU COMMAND
0 0 0 0 FIFO Kthread - Ready 0000000000000000 0069584 52.9% Idle_Task
1 0 0 224 FIFO Kthread - Waiting Semaphore 0000000000000000 0067456 0.0% sim_loop_wq 0x7b4417a003f0 0x7b4417a00470
2 0 0 224 FIFO Kthread - Waiting Semaphore 0000000000000000 0067464 17.6% hpwork 0x4014dba0 0x4014dc20
3 3 0 100 FIFO Task - Running 0000000000000000 0067496 36.8% nsh_main
After:
nsh> ps
TID PID PPID PRI POLICY TYPE NPX STATE EVENT SIGMASK STACK CPU COMMAND
0 0 0 0 FIFO Kthread - Ready 0000000000000000 0069584 100.0% Idle_Task
1 0 0 224 FIFO Kthread - Waiting Semaphore 0000000000000000 0067456 0.0% sim_loop_wq 0x7646932003f0 0x764693200470
2 0 0 224 FIFO Kthread - Waiting Semaphore 0000000000000000 0067464 0.0% hpwork 0x4014dba0 0x4014dc20
3 3 0 100 FIFO Task - Running 0000000000000000 0067496 0.0% nsh_main
This issue was introduced by PR #17075, where the run_start update for the
target task was omitted in the SCHED_CPULOAD_CRITMONITOR branch.
Signed-off-by: chao an <anchao.archer@bytedance.com>
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| .github | ||
| arch | ||
| audio | ||
| binfmt | ||
| boards | ||
| cmake | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| dummy | ||
| fs | ||
| graphics | ||
| include | ||
| libs | ||
| mm | ||
| net | ||
| openamp | ||
| pass1 | ||
| sched | ||
| syscall | ||
| tools | ||
| video | ||
| wireless | ||
| .asf.yaml | ||
| .codespell-ignore-lines | ||
| .codespellrc | ||
| .editorconfig | ||
| .gitignore | ||
| .gitmessage | ||
| .pre-commit-config.yaml | ||
| .yamllint | ||
| AUTHORS | ||
| CMakeLists.txt | ||
| CONTRIBUTING.md | ||
| INVIOLABLES.md | ||
| Kconfig | ||
| LICENSE | ||
| Makefile | ||
| NOTICE | ||
| README.md | ||
| ReleaseNotes | ||
Apache NuttX is a real-time operating system (RTOS) with an emphasis on standards compliance and small footprint. Scalable from 8-bit to 64-bit microcontroller environments, the primary governing standards in NuttX are POSIX and ANSI standards. Additional standard APIs from Unix and other common RTOSs (such as VxWorks) are adopted for functionality not available under these standards, or for functionality that is not appropriate for deeply-embedded environments (such as fork()).
For brevity, many parts of the documentation will refer to Apache NuttX as simply NuttX.
Getting Started
First time on NuttX? Read the Getting Started guide! If you don't have a board available, NuttX has its own simulator that you can run on terminal.
Documentation
You can find the current NuttX documentation on the Documentation Page.
Alternatively, you can build the documentation yourself by following the Documentation Build Instructions.
The old NuttX documentation is still available in the Apache wiki.
Supported Boards
NuttX supports a wide variety of platforms. See the full list on the Supported Platforms page.
Contributing
If you wish to contribute to the NuttX project, read the Contributing guidelines for information on Git usage, coding standard, workflow and the NuttX principles.
License
The code in this repository is under either the Apache 2 license, or a license compatible with the Apache 2 license. See the License Page for more information.