c7b5b3c419
In order to bring consistency in-tree, migrate all samples to the use
the new prefix <zephyr/...>. Note that the conversion has been scripted:
```python
from pathlib import Path
import re
EXTENSIONS = ("c", "h", "cpp", "rst")
for p in Path(".").glob("samples/**/*"):
if not p.is_file() or p.suffix and p.suffix[1:] not in EXTENSIONS:
continue
content = ""
with open(p) as f:
for line in f:
m = re.match(r"^(.*)#include <(.*)>(.*)$", line)
if (m and
not m.group(2).startswith("zephyr/") and
(Path(".") / "include" / "zephyr" / m.group(2)).exists()):
content += (
m.group(1) +
"#include <zephyr/" + m.group(2) +">" +
m.group(3) + "\n"
)
else:
content += line
with open(p, "w") as f:
f.write(content)
```
Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
|
||
|---|---|---|
| .. | ||
| src | ||
| CMakeLists.txt | ||
| prj.conf | ||
| README.rst | ||
| sample.yaml | ||
.. _syscall_perf:
Syscall performances
====================
The goal of this sample application is to measure the performance loss when a
user thread has to go through a system call compared to a supervisor thread that
calls the function directly.
Overview
********
This application creates a supervisor and a user thread.
Then both threads call k_current_get() which returns a reference to the
current thread. The user thread has to go through a system call.
Both threads are showing the number of core clock cycles and the number of
instructions executed while calling k_current_get().
Sample Output
*************
.. code-block:: console
User thread: 18012 cycles 748 instructions
Supervisor thread: 7 cycles 4 instructions
User thread: 20136 cycles 748 instructions
Supervisor thread: 7 cycles 4 instructions
User thread: 18014 cycles 748 instructions
Supervisor thread: 7 cycles 4 instructions